chore: add agent column to TASKS.md schema

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

.env.example

@@ -1,20 +1,129 @@
-# Database (port 5433 avoids conflict with host PostgreSQL)
+# ─────────────────────────────────────────────────────────────────────────────
+# Mosaic — Environment Variables Reference
+# Copy this file to .env and fill in the values for your deployment.
+# Lines beginning with # are comments; optional vars are commented out.
+# ─────────────────────────────────────────────────────────────────────────────
+
+
+# ─── Database (PostgreSQL 17 + pgvector) ─────────────────────────────────────
+# Full connection string used by the gateway, ORM, and migration runner.
+# Port 5433 avoids conflict with a host-side PostgreSQL instance.
 DATABASE_URL=postgresql://mosaic:mosaic@localhost:5433/mosaic
 
-# Valkey (Redis-compatible, port 6380 avoids conflict with host Redis/Valkey)
+# Docker Compose host-port override for the PostgreSQL container (default: 5433)
+# PG_HOST_PORT=5433
+
+
+# ─── Queue (Valkey 8 / Redis-compatible) ─────────────────────────────────────
+# Port 6380 avoids conflict with a host-side Redis/Valkey instance.
 VALKEY_URL=redis://localhost:6380
 
-# Docker Compose host port overrides (optional)
-# PG_HOST_PORT=5433
+# Docker Compose host-port override for the Valkey container (default: 6380)
 # VALKEY_HOST_PORT=6380
 
-# OpenTelemetry
-OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
-OTEL_SERVICE_NAME=mosaic-gateway
 
-# Auth (BetterAuth)
+# ─── Gateway ─────────────────────────────────────────────────────────────────
+# TCP port the NestJS/Fastify gateway listens on (default: 4000)
+GATEWAY_PORT=4000
+
+# Comma-separated list of allowed CORS origins.
+# Must include the web app origin in production.
+GATEWAY_CORS_ORIGIN=http://localhost:3000
+
+
+# ─── Auth (BetterAuth) ───────────────────────────────────────────────────────
+# REQUIRED — random secret used to sign sessions and tokens.
+# Generate with: openssl rand -base64 32
 BETTER_AUTH_SECRET=change-me-to-a-random-32-char-string
+
+# Public base URL of the gateway (used by BetterAuth for callback URLs)
 BETTER_AUTH_URL=http://localhost:4000
 
-# Gateway
-GATEWAY_PORT=4000
+
+# ─── Web App (Next.js) ───────────────────────────────────────────────────────
+# Public gateway URL — accessible from the browser, not just the server.
+NEXT_PUBLIC_GATEWAY_URL=http://localhost:4000
+
+
+# ─── OpenTelemetry ───────────────────────────────────────────────────────────
+# OTLP HTTP endpoint (otel-collector or any OpenTelemetry-compatible backend)
+OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
+
+# Service name shown in traces
+OTEL_SERVICE_NAME=mosaic-gateway
+
+
+# ─── AI Providers ────────────────────────────────────────────────────────────
+
+# Ollama (local models — set OLLAMA_BASE_URL to enable)
+# OLLAMA_BASE_URL=http://localhost:11434
+# OLLAMA_HOST is a legacy alias for OLLAMA_BASE_URL
+# OLLAMA_HOST=http://localhost:11434
+# Comma-separated list of Ollama model IDs to register (default: llama3.2,codellama,mistral)
+# OLLAMA_MODELS=llama3.2,codellama,mistral
+
+# OpenAI — required for embedding and log-summarization features
+# OPENAI_API_KEY=sk-...
+
+# Custom providers — JSON array of provider configs
+# Format: [{"id":"<id>","baseUrl":"<url>","apiKey":"<key>","models":[{"id":"<model-id>","name":"<label>"}]}]
+# MOSAIC_CUSTOM_PROVIDERS=
+
+
+# ─── Embedding Service ───────────────────────────────────────────────────────
+# OpenAI-compatible embeddings endpoint (default: OpenAI)
+# EMBEDDING_API_URL=https://api.openai.com/v1
+# EMBEDDING_MODEL=text-embedding-3-small
+
+
+# ─── Log Summarization Service ───────────────────────────────────────────────
+# OpenAI-compatible chat completions endpoint for log summarization (default: OpenAI)
+# SUMMARIZATION_API_URL=https://api.openai.com/v1
+# SUMMARIZATION_MODEL=gpt-4o-mini
+
+# Cron schedule for summarization job (default: every 6 hours)
+# SUMMARIZATION_CRON=0 */6 * * *
+
+# Cron schedule for log tier management (default: daily at 03:00)
+# TIER_MANAGEMENT_CRON=0 3 * * *
+
+
+# ─── Agent ───────────────────────────────────────────────────────────────────
+# Filesystem sandbox root for agent file tools (default: process.cwd())
+# AGENT_FILE_SANDBOX_DIR=/var/lib/mosaic/sandbox
+
+# Comma-separated list of tool names available to non-admin users.
+# Leave unset to allow all tools for all authenticated users.
+# AGENT_USER_TOOLS=read_file,list_directory,search_files
+
+# System prompt injected into every agent session (optional)
+# AGENT_SYSTEM_PROMPT=You are a helpful assistant.
+
+
+# ─── MCP Servers ─────────────────────────────────────────────────────────────
+# JSON array of MCP server configs — set to enable MCP tool integration.
+# Each entry: {"name":"<id>","url":"<http-or-sse-url>"}
+# MCP_SERVERS=[{"name":"my-mcp","url":"http://localhost:3100/sse"}]
+
+
+# ─── Coordinator ─────────────────────────────────────────────────────────────
+# Root directory used to scope coordinator (worktree/repo) operations.
+# Defaults to the monorepo root auto-detected from process.cwd().
+# MOSAIC_WORKSPACE_ROOT=/home/user/projects/mosaic
+
+
+# ─── Discord Plugin (optional — set DISCORD_BOT_TOKEN to enable) ─────────────
+# DISCORD_BOT_TOKEN=
+# DISCORD_GUILD_ID=
+# DISCORD_GATEWAY_URL=http://localhost:4000
+
+
+# ─── Telegram Plugin (optional — set TELEGRAM_BOT_TOKEN to enable) ───────────
+# TELEGRAM_BOT_TOKEN=
+# TELEGRAM_GATEWAY_URL=http://localhost:4000
+
+
+# ─── Authentik SSO (optional — set AUTHENTIK_CLIENT_ID to enable) ────────────
+# AUTHENTIK_ISSUER=https://auth.example.com/application/o/mosaic/
+# AUTHENTIK_CLIENT_ID=
+# AUTHENTIK_CLIENT_SECRET=

.husky/pre-commit

@@ -1,4 +1 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
-
 npx lint-staged

.husky/pre-push

@@ -1,4 +1 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
-
 pnpm typecheck && pnpm lint && pnpm format:check

.prettierignore

@@ -4,3 +4,4 @@ pnpm-lock.yaml
 **/node_modules
 **/drizzle
 **/.next
+.claude/

.woodpecker/ci.yml

@@ -1,57 +1,61 @@
 variables:
   - &node_image 'node:22-alpine'
-  - &install_deps |
-    corepack enable
-    pnpm install --frozen-lockfile
+  - &enable_pnpm 'corepack enable'
 
 when:
   - event: [push, pull_request, manual]
 
+# Turbo remote cache (turbo.mosaicstack.dev) is configured via Woodpecker
+# repository-level environment variables (TURBO_API, TURBO_TEAM, TURBO_TOKEN).
+# This avoids from_secret which is blocked on pull_request events.
+# If the env vars aren't set, turbo falls back to local cache only.
+
 steps:
   install:
     image: *node_image
     commands:
-      - *install_deps
+      - corepack enable
+      - pnpm install --frozen-lockfile
 
   typecheck:
     image: *node_image
     commands:
-      - *install_deps
+      - *enable_pnpm
       - pnpm typecheck
     depends_on:
       - install
 
+  # lint, format, and test are independent — run in parallel after typecheck
   lint:
     image: *node_image
     commands:
-      - *install_deps
+      - *enable_pnpm
       - pnpm lint
     depends_on:
-      - install
+      - typecheck
 
   format:
     image: *node_image
     commands:
-      - *install_deps
+      - *enable_pnpm
       - pnpm format:check
     depends_on:
-      - install
+      - typecheck
 
   test:
     image: *node_image
     commands:
-      - *install_deps
+      - *enable_pnpm
       - pnpm test
     depends_on:
-      - install
+      - typecheck
 
   build:
     image: *node_image
     commands:
-      - *install_deps
+      - *enable_pnpm
       - pnpm build
     depends_on:
-      - typecheck
       - lint
       - format
       - test

apps/gateway/package.json

@@ -8,21 +8,29 @@
     "build": "tsc",
     "dev": "tsx watch src/main.ts",
     "lint": "eslint src",
-    "typecheck": "tsc --noEmit",
+    "typecheck": "tsc --noEmit -p tsconfig.typecheck.json",
     "test": "vitest run --passWithNoTests"
   },
   "dependencies": {
+    "@fastify/helmet": "^13.0.2",
     "@mariozechner/pi-ai": "~0.57.1",
     "@mariozechner/pi-coding-agent": "~0.57.1",
+    "@modelcontextprotocol/sdk": "^1.27.1",
     "@mosaic/auth": "workspace:^",
+    "@mosaic/queue": "workspace:^",
     "@mosaic/brain": "workspace:^",
     "@mosaic/coord": "workspace:^",
     "@mosaic/db": "workspace:^",
+    "@mosaic/discord-plugin": "workspace:^",
+    "@mosaic/log": "workspace:^",
+    "@mosaic/memory": "workspace:^",
+    "@mosaic/telegram-plugin": "workspace:^",
     "@mosaic/types": "workspace:^",
     "@nestjs/common": "^11.0.0",
     "@nestjs/core": "^11.0.0",
     "@nestjs/platform-fastify": "^11.0.0",
     "@nestjs/platform-socket.io": "^11.0.0",
+    "@nestjs/throttler": "^6.5.0",
     "@nestjs/websockets": "^11.0.0",
     "@opentelemetry/auto-instrumentations-node": "^0.71.0",
     "@opentelemetry/exporter-metrics-otlp-http": "^0.213.0",
@@ -33,14 +41,20 @@
     "@opentelemetry/semantic-conventions": "^1.40.0",
     "@sinclair/typebox": "^0.34.48",
     "better-auth": "^1.5.5",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.15.1",
+    "dotenv": "^17.3.1",
     "fastify": "^5.0.0",
+    "node-cron": "^4.2.1",
     "reflect-metadata": "^0.2.0",
     "rxjs": "^7.8.0",
     "socket.io": "^4.8.0",
-    "uuid": "^11.0.0"
+    "uuid": "^11.0.0",
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@types/node": "^22.0.0",
+    "@types/node-cron": "^3.0.11",
     "@types/uuid": "^10.0.0",
     "tsx": "^4.0.0",
     "typescript": "^5.8.0",

apps/gateway/src/__tests__/resource-ownership.test.ts

@@ -0,0 +1,148 @@
+import { ForbiddenException, NotFoundException } from '@nestjs/common';
+import { describe, expect, it, vi } from 'vitest';
+import { ConversationsController } from '../conversations/conversations.controller.js';
+import { MissionsController } from '../missions/missions.controller.js';
+import { ProjectsController } from '../projects/projects.controller.js';
+import { TasksController } from '../tasks/tasks.controller.js';
+
+function createBrain() {
+  return {
+    conversations: {
+      findAll: vi.fn(),
+      findById: vi.fn(),
+      create: vi.fn(),
+      update: vi.fn(),
+      remove: vi.fn(),
+      findMessages: vi.fn(),
+      addMessage: vi.fn(),
+    },
+    projects: {
+      findAll: vi.fn(),
+      findAllForUser: vi.fn(),
+      findById: vi.fn(),
+      create: vi.fn(),
+      update: vi.fn(),
+      remove: vi.fn(),
+    },
+    missions: {
+      findAll: vi.fn(),
+      findAllByUser: vi.fn(),
+      findById: vi.fn(),
+      findByIdAndUser: vi.fn(),
+      findByProject: vi.fn(),
+      create: vi.fn(),
+      update: vi.fn(),
+      remove: vi.fn(),
+    },
+    missionTasks: {
+      findByMissionAndUser: vi.fn(),
+      findByIdAndUser: vi.fn(),
+      create: vi.fn(),
+      update: vi.fn(),
+      remove: vi.fn(),
+    },
+    tasks: {
+      findAll: vi.fn(),
+      findById: vi.fn(),
+      findByProject: vi.fn(),
+      findByMission: vi.fn(),
+      findByStatus: vi.fn(),
+      create: vi.fn(),
+      update: vi.fn(),
+      remove: vi.fn(),
+    },
+  };
+}
+
+describe('Resource ownership checks', () => {
+  it('forbids access to another user conversation', async () => {
+    const brain = createBrain();
+    brain.conversations.findById.mockResolvedValue({ id: 'conv-1', userId: 'user-2' });
+    const controller = new ConversationsController(brain as never);
+
+    await expect(controller.findOne('conv-1', { id: 'user-1' })).rejects.toBeInstanceOf(
+      ForbiddenException,
+    );
+  });
+
+  it('forbids access to another user project', async () => {
+    const brain = createBrain();
+    brain.projects.findById.mockResolvedValue({ id: 'project-1', ownerId: 'user-2' });
+    const teamsService = { canAccessProject: vi.fn().mockResolvedValue(false) };
+    const controller = new ProjectsController(brain as never, teamsService as never);
+
+    await expect(controller.findOne('project-1', { id: 'user-1' })).rejects.toBeInstanceOf(
+      ForbiddenException,
+    );
+  });
+
+  it('forbids access to a mission owned by another user', async () => {
+    const brain = createBrain();
+    // findByIdAndUser returns undefined when the mission doesn't belong to the user
+    brain.missions.findByIdAndUser.mockResolvedValue(undefined);
+    const controller = new MissionsController(brain as never);
+
+    await expect(controller.findOne('mission-1', { id: 'user-1' })).rejects.toBeInstanceOf(
+      NotFoundException,
+    );
+  });
+
+  it('forbids access to a task owned by another project owner', async () => {
+    const brain = createBrain();
+    brain.tasks.findById.mockResolvedValue({ id: 'task-1', projectId: 'project-1' });
+    brain.projects.findById.mockResolvedValue({ id: 'project-1', ownerId: 'user-2' });
+    const controller = new TasksController(brain as never);
+
+    await expect(controller.findOne('task-1', { id: 'user-1' })).rejects.toBeInstanceOf(
+      ForbiddenException,
+    );
+  });
+
+  it('forbids creating a task with an unowned project', async () => {
+    const brain = createBrain();
+    brain.projects.findById.mockResolvedValue({ id: 'project-1', ownerId: 'user-2' });
+    const controller = new TasksController(brain as never);
+
+    await expect(
+      controller.create(
+        {
+          title: 'Task',
+          projectId: 'project-1',
+        },
+        { id: 'user-1' },
+      ),
+    ).rejects.toBeInstanceOf(ForbiddenException);
+  });
+
+  it('forbids listing tasks for an unowned project', async () => {
+    const brain = createBrain();
+    brain.projects.findById.mockResolvedValue({ id: 'project-1', ownerId: 'user-2' });
+    const controller = new TasksController(brain as never);
+
+    await expect(
+      controller.list({ id: 'user-1' }, 'project-1', undefined, undefined),
+    ).rejects.toBeInstanceOf(ForbiddenException);
+  });
+
+  it('lists only tasks for the current user owned projects when no filter is provided', async () => {
+    const brain = createBrain();
+    brain.projects.findAll.mockResolvedValue([
+      { id: 'project-1', ownerId: 'user-1' },
+      { id: 'project-2', ownerId: 'user-2' },
+    ]);
+    brain.missions.findAll.mockResolvedValue([{ id: 'mission-1', projectId: 'project-1' }]);
+    brain.tasks.findAll.mockResolvedValue([
+      { id: 'task-1', projectId: 'project-1' },
+      { id: 'task-2', missionId: 'mission-1' },
+      { id: 'task-3', projectId: 'project-2' },
+    ]);
+    const controller = new TasksController(brain as never);
+
+    await expect(
+      controller.list({ id: 'user-1' }, undefined, undefined, undefined),
+    ).resolves.toEqual([
+      { id: 'task-1', projectId: 'project-1' },
+      { id: 'task-2', missionId: 'mission-1' },
+    ]);
+  });
+});

apps/gateway/src/admin/admin-health.controller.ts

@@ -0,0 +1,73 @@
+import { Controller, Get, Inject, UseGuards } from '@nestjs/common';
+import { sql, type Db } from '@mosaic/db';
+import { createQueue } from '@mosaic/queue';
+import { DB } from '../database/database.module.js';
+import { AgentService } from '../agent/agent.service.js';
+import { ProviderService } from '../agent/provider.service.js';
+import { AdminGuard } from './admin.guard.js';
+import type { HealthStatusDto, ServiceStatusDto } from './admin.dto.js';
+
+@Controller('api/admin/health')
+@UseGuards(AdminGuard)
+export class AdminHealthController {
+  constructor(
+    @Inject(DB) private readonly db: Db,
+    @Inject(AgentService) private readonly agentService: AgentService,
+    @Inject(ProviderService) private readonly providerService: ProviderService,
+  ) {}
+
+  @Get()
+  async check(): Promise<HealthStatusDto> {
+    const [database, cache] = await Promise.all([this.checkDatabase(), this.checkCache()]);
+
+    const sessions = this.agentService.listSessions();
+    const providers = this.providerService.listProviders();
+
+    const allOk = database.status === 'ok' && cache.status === 'ok';
+
+    return {
+      status: allOk ? 'ok' : 'degraded',
+      database,
+      cache,
+      agentPool: { activeSessions: sessions.length },
+      providers: providers.map((p) => ({
+        id: p.id,
+        name: p.name,
+        available: p.available,
+        modelCount: p.models.length,
+      })),
+      checkedAt: new Date().toISOString(),
+    };
+  }
+
+  private async checkDatabase(): Promise<ServiceStatusDto> {
+    const start = Date.now();
+    try {
+      await this.db.execute(sql`SELECT 1`);
+      return { status: 'ok', latencyMs: Date.now() - start };
+    } catch (err) {
+      return {
+        status: 'error',
+        latencyMs: Date.now() - start,
+        error: err instanceof Error ? err.message : String(err),
+      };
+    }
+  }
+
+  private async checkCache(): Promise<ServiceStatusDto> {
+    const start = Date.now();
+    const handle = createQueue();
+    try {
+      await handle.redis.ping();
+      return { status: 'ok', latencyMs: Date.now() - start };
+    } catch (err) {
+      return {
+        status: 'error',
+        latencyMs: Date.now() - start,
+        error: err instanceof Error ? err.message : String(err),
+      };
+    } finally {
+      await handle.close().catch(() => {});
+    }
+  }
+}

apps/gateway/src/admin/admin.controller.ts

@@ -0,0 +1,146 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  InternalServerErrorException,
+  NotFoundException,
+  Param,
+  Patch,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import { eq, type Db, users as usersTable } from '@mosaic/db';
+import type { Auth } from '@mosaic/auth';
+import { AUTH } from '../auth/auth.tokens.js';
+import { DB } from '../database/database.module.js';
+import { AdminGuard } from './admin.guard.js';
+import type {
+  BanUserDto,
+  CreateUserDto,
+  UpdateUserRoleDto,
+  UserDto,
+  UserListDto,
+} from './admin.dto.js';
+
+type UserRow = typeof usersTable.$inferSelect;
+
+function toUserDto(u: UserRow): UserDto {
+  return {
+    id: u.id,
+    name: u.name,
+    email: u.email,
+    role: u.role,
+    banned: u.banned ?? false,
+    banReason: u.banReason ?? null,
+    createdAt: u.createdAt.toISOString(),
+    updatedAt: u.updatedAt.toISOString(),
+  };
+}
+
+async function requireUpdated(
+  db: Db,
+  id: string,
+  update: Partial<Omit<UserRow, 'id' | 'createdAt'>>,
+): Promise<UserDto> {
+  const [updated] = await db
+    .update(usersTable)
+    .set({ ...update, updatedAt: new Date() })
+    .where(eq(usersTable.id, id))
+    .returning();
+  if (!updated) throw new InternalServerErrorException('Update returned no rows');
+  return toUserDto(updated);
+}
+
+@Controller('api/admin/users')
+@UseGuards(AdminGuard)
+export class AdminController {
+  constructor(
+    @Inject(DB) private readonly db: Db,
+    @Inject(AUTH) private readonly auth: Auth,
+  ) {}
+
+  @Get()
+  async listUsers(): Promise<UserListDto> {
+    const rows = await this.db.select().from(usersTable).orderBy(usersTable.createdAt);
+    const userList: UserDto[] = rows.map(toUserDto);
+    return { users: userList, total: userList.length };
+  }
+
+  @Get(':id')
+  async getUser(@Param('id') id: string): Promise<UserDto> {
+    const [user] = await this.db.select().from(usersTable).where(eq(usersTable.id, id)).limit(1);
+    if (!user) throw new NotFoundException('User not found');
+    return toUserDto(user);
+  }
+
+  @Post()
+  async createUser(@Body() body: CreateUserDto): Promise<UserDto> {
+    // Use auth API to create user so password is properly hashed
+    const authApi = this.auth.api as unknown as {
+      createUser: (opts: {
+        body: { name: string; email: string; password: string; role?: string };
+      }) => Promise<{
+        user: { id: string; name: string; email: string; createdAt: unknown; updatedAt: unknown };
+      }>;
+    };
+
+    const result = await authApi.createUser({
+      body: {
+        name: body.name,
+        email: body.email,
+        password: body.password,
+        role: body.role ?? 'member',
+      },
+    });
+
+    // Re-fetch from DB to get full row with our schema
+    const [user] = await this.db
+      .select()
+      .from(usersTable)
+      .where(eq(usersTable.id, result.user.id))
+      .limit(1);
+
+    if (!user) throw new InternalServerErrorException('User created but not found in DB');
+    return toUserDto(user);
+  }
+
+  @Patch(':id/role')
+  async setRole(@Param('id') id: string, @Body() body: UpdateUserRoleDto): Promise<UserDto> {
+    await this.ensureExists(id);
+    return requireUpdated(this.db, id, { role: body.role });
+  }
+
+  @Post(':id/ban')
+  @HttpCode(HttpStatus.OK)
+  async banUser(@Param('id') id: string, @Body() body: BanUserDto): Promise<UserDto> {
+    await this.ensureExists(id);
+    return requireUpdated(this.db, id, { banned: true, banReason: body.reason ?? null });
+  }
+
+  @Post(':id/unban')
+  @HttpCode(HttpStatus.OK)
+  async unbanUser(@Param('id') id: string): Promise<UserDto> {
+    await this.ensureExists(id);
+    return requireUpdated(this.db, id, { banned: false, banReason: null, banExpires: null });
+  }
+
+  @Delete(':id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async deleteUser(@Param('id') id: string): Promise<void> {
+    await this.ensureExists(id);
+    await this.db.delete(usersTable).where(eq(usersTable.id, id));
+  }
+
+  private async ensureExists(id: string): Promise<void> {
+    const [existing] = await this.db
+      .select({ id: usersTable.id })
+      .from(usersTable)
+      .where(eq(usersTable.id, id))
+      .limit(1);
+    if (!existing) throw new NotFoundException('User not found');
+  }
+}

apps/gateway/src/admin/admin.dto.ts

@@ -0,0 +1,56 @@
+export interface UserDto {
+  id: string;
+  name: string;
+  email: string;
+  role: string;
+  banned: boolean;
+  banReason: string | null;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface UserListDto {
+  users: UserDto[];
+  total: number;
+}
+
+export interface CreateUserDto {
+  name: string;
+  email: string;
+  password: string;
+  role?: string;
+}
+
+export interface UpdateUserRoleDto {
+  role: string;
+}
+
+export interface BanUserDto {
+  reason?: string;
+}
+
+export interface HealthStatusDto {
+  status: 'ok' | 'degraded' | 'error';
+  database: ServiceStatusDto;
+  cache: ServiceStatusDto;
+  agentPool: AgentPoolStatusDto;
+  providers: ProviderStatusDto[];
+  checkedAt: string;
+}
+
+export interface ServiceStatusDto {
+  status: 'ok' | 'error';
+  latencyMs?: number;
+  error?: string;
+}
+
+export interface AgentPoolStatusDto {
+  activeSessions: number;
+}
+
+export interface ProviderStatusDto {
+  id: string;
+  name: string;
+  available: boolean;
+  modelCount: number;
+}

apps/gateway/src/admin/admin.guard.ts

@@ -0,0 +1,64 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  ForbiddenException,
+  Inject,
+  Injectable,
+  UnauthorizedException,
+} from '@nestjs/common';
+import { fromNodeHeaders } from 'better-auth/node';
+import type { Auth } from '@mosaic/auth';
+import type { Db } from '@mosaic/db';
+import { eq, users as usersTable } from '@mosaic/db';
+import type { FastifyRequest } from 'fastify';
+import { AUTH } from '../auth/auth.tokens.js';
+import { DB } from '../database/database.module.js';
+
+interface UserWithRole {
+  id: string;
+  role?: string;
+}
+
+@Injectable()
+export class AdminGuard implements CanActivate {
+  constructor(
+    @Inject(AUTH) private readonly auth: Auth,
+    @Inject(DB) private readonly db: Db,
+  ) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const request = context.switchToHttp().getRequest<FastifyRequest>();
+    const headers = fromNodeHeaders(request.raw.headers);
+
+    const result = await this.auth.api.getSession({ headers });
+
+    if (!result) {
+      throw new UnauthorizedException('Invalid or expired session');
+    }
+
+    const user = result.user as UserWithRole;
+
+    // Ensure the role field is populated. better-auth should include additionalFields
+    // in the session, but as a fallback, fetch the role from the database if needed.
+    let userRole = user.role;
+    if (!userRole) {
+      const [dbUser] = await this.db
+        .select({ role: usersTable.role })
+        .from(usersTable)
+        .where(eq(usersTable.id, user.id))
+        .limit(1);
+      userRole = dbUser?.role ?? 'member';
+      // Update the session user object with the fetched role
+      (user as UserWithRole).role = userRole;
+    }
+
+    if (userRole !== 'admin') {
+      throw new ForbiddenException('Admin access required');
+    }
+
+    (request as FastifyRequest & { user: unknown; session: unknown }).user = result.user;
+    (request as FastifyRequest & { user: unknown; session: unknown }).session = result.session;
+
+    return true;
+  }
+}

apps/gateway/src/admin/admin.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { AdminController } from './admin.controller.js';
+import { AdminHealthController } from './admin-health.controller.js';
+import { AdminGuard } from './admin.guard.js';
+
+@Module({
+  controllers: [AdminController, AdminHealthController],
+  providers: [AdminGuard],
+})
+export class AdminModule {}

apps/gateway/src/agent/agent-config.dto.ts

@@ -0,0 +1,97 @@
+import {
+  IsArray,
+  IsBoolean,
+  IsIn,
+  IsObject,
+  IsOptional,
+  IsString,
+  IsUUID,
+  MaxLength,
+} from 'class-validator';
+
+const agentStatuses = ['idle', 'active', 'error', 'offline'] as const;
+
+export class CreateAgentConfigDto {
+  @IsString()
+  @MaxLength(255)
+  name!: string;
+
+  @IsString()
+  @MaxLength(255)
+  provider!: string;
+
+  @IsString()
+  @MaxLength(255)
+  model!: string;
+
+  @IsOptional()
+  @IsIn(agentStatuses)
+  status?: 'idle' | 'active' | 'error' | 'offline';
+
+  @IsOptional()
+  @IsUUID()
+  projectId?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(50_000)
+  systemPrompt?: string;
+
+  @IsOptional()
+  @IsArray()
+  allowedTools?: string[];
+
+  @IsOptional()
+  @IsArray()
+  skills?: string[];
+
+  @IsOptional()
+  @IsBoolean()
+  isSystem?: boolean;
+
+  @IsOptional()
+  @IsObject()
+  config?: Record<string, unknown>;
+}
+
+export class UpdateAgentConfigDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  provider?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  model?: string;
+
+  @IsOptional()
+  @IsIn(agentStatuses)
+  status?: 'idle' | 'active' | 'error' | 'offline';
+
+  @IsOptional()
+  @IsUUID()
+  projectId?: string | null;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(50_000)
+  systemPrompt?: string | null;
+
+  @IsOptional()
+  @IsArray()
+  allowedTools?: string[] | null;
+
+  @IsOptional()
+  @IsArray()
+  skills?: string[] | null;
+
+  @IsOptional()
+  @IsObject()
+  config?: Record<string, unknown> | null;
+}

apps/gateway/src/agent/agent-configs.controller.ts

@@ -0,0 +1,84 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  ForbiddenException,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  NotFoundException,
+  Param,
+  Patch,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import type { Brain } from '@mosaic/brain';
+import { BRAIN } from '../brain/brain.tokens.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+import { CreateAgentConfigDto, UpdateAgentConfigDto } from './agent-config.dto.js';
+
+@Controller('api/agents')
+@UseGuards(AuthGuard)
+export class AgentConfigsController {
+  constructor(@Inject(BRAIN) private readonly brain: Brain) {}
+
+  @Get()
+  async list(@CurrentUser() user: { id: string; role?: string }) {
+    return this.brain.agents.findAccessible(user.id);
+  }
+
+  @Get(':id')
+  async findOne(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    const agent = await this.brain.agents.findById(id);
+    if (!agent) throw new NotFoundException('Agent not found');
+    if (!agent.isSystem && agent.ownerId !== user.id) {
+      throw new ForbiddenException('Agent does not belong to the current user');
+    }
+    return agent;
+  }
+
+  @Post()
+  async create(@Body() dto: CreateAgentConfigDto, @CurrentUser() user: { id: string }) {
+    return this.brain.agents.create({
+      ...dto,
+      ownerId: user.id,
+      isSystem: false,
+    });
+  }
+
+  @Patch(':id')
+  async update(
+    @Param('id') id: string,
+    @Body() dto: UpdateAgentConfigDto,
+    @CurrentUser() user: { id: string; role?: string },
+  ) {
+    const agent = await this.brain.agents.findById(id);
+    if (!agent) throw new NotFoundException('Agent not found');
+    if (agent.isSystem && user.role !== 'admin') {
+      throw new ForbiddenException('Only admins can update system agents');
+    }
+    if (!agent.isSystem && agent.ownerId !== user.id) {
+      throw new ForbiddenException('Agent does not belong to the current user');
+    }
+    const updated = await this.brain.agents.update(id, dto);
+    if (!updated) throw new NotFoundException('Agent not found');
+    return updated;
+  }
+
+  @Delete(':id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async remove(@Param('id') id: string, @CurrentUser() user: { id: string; role?: string }) {
+    const agent = await this.brain.agents.findById(id);
+    if (!agent) throw new NotFoundException('Agent not found');
+    if (agent.isSystem) {
+      throw new ForbiddenException('Cannot delete system agents');
+    }
+    if (agent.ownerId !== user.id) {
+      throw new ForbiddenException('Agent does not belong to the current user');
+    }
+    const deleted = await this.brain.agents.remove(id);
+    if (!deleted) throw new NotFoundException('Agent not found');
+  }
+}

apps/gateway/src/agent/agent.module.ts

@@ -2,15 +2,20 @@ import { Global, Module } from '@nestjs/common';
 import { AgentService } from './agent.service.js';
 import { ProviderService } from './provider.service.js';
 import { RoutingService } from './routing.service.js';
+import { SkillLoaderService } from './skill-loader.service.js';
 import { ProvidersController } from './providers.controller.js';
 import { SessionsController } from './sessions.controller.js';
+import { AgentConfigsController } from './agent-configs.controller.js';
 import { CoordModule } from '../coord/coord.module.js';
+import { McpClientModule } from '../mcp-client/mcp-client.module.js';
+import { SkillsModule } from '../skills/skills.module.js';
+import { GCModule } from '../gc/gc.module.js';
 
 @Global()
 @Module({
-  imports: [CoordModule],
-  providers: [ProviderService, RoutingService, AgentService],
-  controllers: [ProvidersController, SessionsController],
-  exports: [AgentService, ProviderService, RoutingService],
+  imports: [CoordModule, McpClientModule, SkillsModule, GCModule],
+  providers: [ProviderService, RoutingService, SkillLoaderService, AgentService],
+  controllers: [ProvidersController, SessionsController, AgentConfigsController],
+  exports: [AgentService, ProviderService, RoutingService, SkillLoaderService],
 })
 export class AgentModule {}

apps/gateway/src/agent/agent.service.ts

@@ -1,22 +1,65 @@
-import { Inject, Injectable, Logger, type OnModuleDestroy } from '@nestjs/common';
+import { Inject, Injectable, Logger, Optional, type OnModuleDestroy } from '@nestjs/common';
 import {
   createAgentSession,
+  DefaultResourceLoader,
   SessionManager,
   type AgentSession as PiAgentSession,
   type AgentSessionEvent,
   type ToolDefinition,
 } from '@mariozechner/pi-coding-agent';
 import type { Brain } from '@mosaic/brain';
+import type { Memory } from '@mosaic/memory';
 import { BRAIN } from '../brain/brain.tokens.js';
+import { MEMORY } from '../memory/memory.tokens.js';
+import { EmbeddingService } from '../memory/embedding.service.js';
 import { CoordService } from '../coord/coord.service.js';
 import { ProviderService } from './provider.service.js';
+import { McpClientService } from '../mcp-client/mcp-client.service.js';
+import { SkillLoaderService } from './skill-loader.service.js';
 import { createBrainTools } from './tools/brain-tools.js';
 import { createCoordTools } from './tools/coord-tools.js';
+import { createMemoryTools } from './tools/memory-tools.js';
+import { createFileTools } from './tools/file-tools.js';
+import { createGitTools } from './tools/git-tools.js';
+import { createShellTools } from './tools/shell-tools.js';
+import { createWebTools } from './tools/web-tools.js';
 import type { SessionInfoDto } from './session.dto.js';
+import { SystemOverrideService } from '../preferences/system-override.service.js';
+import { PreferencesService } from '../preferences/preferences.service.js';
+import { SessionGCService } from '../gc/session-gc.service.js';
 
 export interface AgentSessionOptions {
   provider?: string;
   modelId?: string;
+  /**
+   * Sandbox working directory for the session.
+   * File, git, and shell tools will be restricted to this directory.
+   * Falls back to AGENT_FILE_SANDBOX_DIR env var or process.cwd().
+   */
+  sandboxDir?: string;
+  /**
+   * Platform-level system prompt for this session.
+   * Merged with skill prompt additions (platform prompt first, then skills).
+   * Falls back to AGENT_SYSTEM_PROMPT env var when omitted.
+   */
+  systemPrompt?: string;
+  /**
+   * Explicit allowlist of tool names available in this session.
+   * When set, only listed tools are registered with the agent.
+   * When omitted for non-admin users, falls back to AGENT_USER_TOOLS env var.
+   * Admins (isAdmin=true) always receive the full tool set unless explicitly restricted.
+   */
+  allowedTools?: string[];
+  /** Whether the requesting user has admin privileges. Controls default tool access. */
+  isAdmin?: boolean;
+  /**
+   * DB agent config ID. When provided, loads agent config from DB and merges
+   * provider, model, systemPrompt, and allowedTools. Explicit call-site options
+   * take precedence over config values.
+   */
+  agentConfigId?: string;
+  /** ID of the user who owns this session. Used for preferences and system override lookups. */
+  userId?: string;
 }
 
 export interface AgentSession {
@@ -29,6 +72,14 @@ export interface AgentSession {
   createdAt: number;
   promptCount: number;
   channels: Set<string>;
+  /** System prompt additions injected from enabled prompt-type skills. */
+  skillPromptAdditions: string[];
+  /** Resolved sandbox directory for this session. */
+  sandboxDir: string;
+  /** Tool names available in this session, or null when all tools are available. */
+  allowedTools: string[] | null;
+  /** User ID that owns this session, used for preference lookups. */
+  userId?: string;
 }
 
 @Injectable()
@@ -37,15 +88,64 @@ export class AgentService implements OnModuleDestroy {
   private readonly sessions = new Map<string, AgentSession>();
   private readonly creating = new Map<string, Promise<AgentSession>>();
 
-  private readonly customTools: ToolDefinition[];
-
   constructor(
     @Inject(ProviderService) private readonly providerService: ProviderService,
     @Inject(BRAIN) private readonly brain: Brain,
+    @Inject(MEMORY) private readonly memory: Memory,
+    @Inject(EmbeddingService) private readonly embeddingService: EmbeddingService,
     @Inject(CoordService) private readonly coordService: CoordService,
-  ) {
-    this.customTools = [...createBrainTools(brain), ...createCoordTools(coordService)];
-    this.logger.log(`Registered ${this.customTools.length} custom tools`);
+    @Inject(McpClientService) private readonly mcpClientService: McpClientService,
+    @Inject(SkillLoaderService) private readonly skillLoaderService: SkillLoaderService,
+    @Optional()
+    @Inject(SystemOverrideService)
+    private readonly systemOverride: SystemOverrideService | null,
+    @Optional()
+    @Inject(PreferencesService)
+    private readonly preferencesService: PreferencesService | null,
+    @Inject(SessionGCService) private readonly gc: SessionGCService,
+  ) {}
+
+  /**
+   * Build the full set of custom tools scoped to the given sandbox directory.
+   * Brain/coord/memory/web tools are stateless with respect to cwd; file/git/shell
+   * tools receive the resolved sandboxDir so they operate within the sandbox.
+   */
+  private buildToolsForSandbox(sandboxDir: string): ToolDefinition[] {
+    return [
+      ...createBrainTools(this.brain),
+      ...createCoordTools(this.coordService),
+      ...createMemoryTools(
+        this.memory,
+        this.embeddingService.available ? this.embeddingService : null,
+      ),
+      ...createFileTools(sandboxDir),
+      ...createGitTools(sandboxDir),
+      ...createShellTools(sandboxDir),
+      ...createWebTools(),
+    ];
+  }
+
+  /**
+   * Resolve the tool allowlist for a session.
+   * - Admin users: all tools unless an explicit allowedTools list is passed.
+   * - Regular users: use allowedTools if provided, otherwise parse AGENT_USER_TOOLS env var.
+   * Returns null when all tools should be available.
+   */
+  private resolveAllowedTools(isAdmin: boolean, allowedTools?: string[]): string[] | null {
+    if (allowedTools !== undefined) {
+      return allowedTools.length === 0 ? [] : allowedTools;
+    }
+    if (isAdmin) {
+      return null; // admins get everything
+    }
+    const envTools = process.env['AGENT_USER_TOOLS'];
+    if (!envTools) {
+      return null; // no restriction configured
+    }
+    return envTools
+      .split(',')
+      .map((t) => t.trim())
+      .filter((t) => t.length > 0);
   }
 
   async createSession(sessionId: string, options?: AgentSessionOptions): Promise<AgentSession> {
@@ -66,22 +166,104 @@ export class AgentService implements OnModuleDestroy {
     sessionId: string,
     options?: AgentSessionOptions,
   ): Promise<AgentSession> {
-    const model = this.resolveModel(options);
+    // Merge DB agent config when agentConfigId is provided
+    let mergedOptions = options;
+    if (options?.agentConfigId) {
+      const agentConfig = await this.brain.agents.findById(options.agentConfigId);
+      if (agentConfig) {
+        mergedOptions = {
+          provider: options.provider ?? agentConfig.provider,
+          modelId: options.modelId ?? agentConfig.model,
+          systemPrompt: options.systemPrompt ?? agentConfig.systemPrompt ?? undefined,
+          allowedTools: options.allowedTools ?? agentConfig.allowedTools ?? undefined,
+          sandboxDir: options.sandboxDir,
+          isAdmin: options.isAdmin,
+          agentConfigId: options.agentConfigId,
+        };
+        this.logger.log(
+          `Merged agent config "${agentConfig.name}" (${agentConfig.id}) into session ${sessionId}`,
+        );
+      }
+    }
+
+    const model = this.resolveModel(mergedOptions);
     const providerName = model?.provider ?? 'default';
     const modelId = model?.id ?? 'default';
 
-    this.logger.log(
-      `Creating agent session: ${sessionId} (provider=${providerName}, model=${modelId})`,
+    // Resolve sandbox directory: option > env var > process.cwd()
+    const sandboxDir =
+      mergedOptions?.sandboxDir ?? process.env['AGENT_FILE_SANDBOX_DIR'] ?? process.cwd();
+
+    // Resolve allowed tool set
+    const allowedTools = this.resolveAllowedTools(
+      mergedOptions?.isAdmin ?? false,
+      mergedOptions?.allowedTools,
     );
 
+    this.logger.log(
+      `Creating agent session: ${sessionId} (provider=${providerName}, model=${modelId}, sandbox=${sandboxDir}, tools=${allowedTools === null ? 'all' : allowedTools.join(',') || 'none'})`,
+    );
+
+    // Load skill tools from the catalog
+    const { metaTools: skillMetaTools, promptAdditions } =
+      await this.skillLoaderService.loadForSession();
+    if (skillMetaTools.length > 0) {
+      this.logger.log(`Attaching ${skillMetaTools.length} skill tool(s) to session ${sessionId}`);
+    }
+    if (promptAdditions.length > 0) {
+      this.logger.log(
+        `Injecting ${promptAdditions.length} skill prompt addition(s) into session ${sessionId}`,
+      );
+    }
+
+    // Build per-session tools scoped to the sandbox directory
+    const sandboxTools = this.buildToolsForSandbox(sandboxDir);
+
+    // Combine static tools with dynamically discovered MCP client tools and skill tools
+    const mcpTools = this.mcpClientService.getToolDefinitions();
+    let allCustomTools = [...sandboxTools, ...skillMetaTools, ...mcpTools];
+    if (mcpTools.length > 0) {
+      this.logger.log(`Attaching ${mcpTools.length} MCP client tool(s) to session ${sessionId}`);
+    }
+
+    // Filter tools by allowlist when a restriction is in effect
+    if (allowedTools !== null) {
+      const allowedSet = new Set(allowedTools);
+      const before = allCustomTools.length;
+      allCustomTools = allCustomTools.filter((t) => allowedSet.has(t.name));
+      this.logger.log(
+        `Tool restriction applied: ${allCustomTools.length}/${before} tools allowed for session ${sessionId}`,
+      );
+    }
+
+    // Build system prompt: platform prompt + skill additions appended
+    const platformPrompt =
+      mergedOptions?.systemPrompt ?? process.env['AGENT_SYSTEM_PROMPT'] ?? undefined;
+    const appendSystemPrompt =
+      promptAdditions.length > 0 ? promptAdditions.join('\n\n') : undefined;
+
+    // Construct a resource loader that injects the configured system prompt
+    const resourceLoader = new DefaultResourceLoader({
+      cwd: sandboxDir,
+      noExtensions: true,
+      noSkills: true,
+      noPromptTemplates: true,
+      noThemes: true,
+      systemPrompt: platformPrompt,
+      appendSystemPrompt: appendSystemPrompt,
+    });
+    await resourceLoader.reload();
+
     let piSession: PiAgentSession;
     try {
       const result = await createAgentSession({
         sessionManager: SessionManager.inMemory(),
         modelRegistry: this.providerService.getRegistry(),
         model: model ?? undefined,
+        cwd: sandboxDir,
         tools: [],
-        customTools: this.customTools,
+        customTools: allCustomTools,
+        resourceLoader,
       });
       piSession = result.session;
     } catch (err) {
@@ -114,6 +296,10 @@ export class AgentService implements OnModuleDestroy {
       createdAt: Date.now(),
       promptCount: 0,
       channels: new Set(),
+      skillPromptAdditions: promptAdditions,
+      sandboxDir,
+      allowedTools,
+      userId: mergedOptions?.userId,
     };
 
     this.sessions.set(sessionId, session);
@@ -197,8 +383,20 @@ export class AgentService implements OnModuleDestroy {
       throw new Error(`No agent session found: ${sessionId}`);
     }
     session.promptCount += 1;
+
+    // Prepend session-scoped system override if present (renew TTL on each turn)
+    let effectiveMessage = message;
+    if (this.systemOverride) {
+      const override = await this.systemOverride.get(sessionId);
+      if (override) {
+        effectiveMessage = `[System Override]\n${override}\n\n${message}`;
+        await this.systemOverride.renew(sessionId);
+        this.logger.debug(`Applied system override for session ${sessionId}`);
+      }
+    }
+
     try {
-      await session.piSession.prompt(message);
+      await session.piSession.prompt(effectiveMessage);
     } catch (err) {
       this.logger.error(
         `Prompt failed for session=${sessionId}, messageLength=${message.length}`,
@@ -234,6 +432,14 @@ export class AgentService implements OnModuleDestroy {
     session.listeners.clear();
     session.channels.clear();
     this.sessions.delete(sessionId);
+
+    // Run GC cleanup for this session (fire and forget, errors are logged)
+    this.gc.collect(sessionId).catch((err: unknown) => {
+      this.logger.error(
+        `GC collect failed for session ${sessionId}`,
+        err instanceof Error ? err.stack : String(err),
+      );
+    });
   }
 
   async onModuleDestroy(): Promise<void> {

apps/gateway/src/agent/provider.dto.ts

@@ -0,0 +1,17 @@
+export interface TestConnectionDto {
+  /** Provider identifier to test (e.g. 'ollama', custom provider id) */
+  providerId: string;
+  /** Optional base URL override for ad-hoc testing */
+  baseUrl?: string;
+}
+
+export interface TestConnectionResultDto {
+  providerId: string;
+  reachable: boolean;
+  /** Round-trip latency in milliseconds (present when reachable) */
+  latencyMs?: number;
+  /** Human-readable error when unreachable */
+  error?: string;
+  /** Model ids discovered at the remote endpoint (present when reachable) */
+  discoveredModels?: string[];
+}

apps/gateway/src/agent/provider.service.ts

@@ -2,14 +2,15 @@ import { Injectable, Logger, type OnModuleInit } from '@nestjs/common';
 import { ModelRegistry, AuthStorage } from '@mariozechner/pi-coding-agent';
 import type { Model, Api } from '@mariozechner/pi-ai';
 import type { ModelInfo, ProviderInfo, CustomProviderConfig } from '@mosaic/types';
+import type { TestConnectionResultDto } from './provider.dto.js';
 
 @Injectable()
 export class ProviderService implements OnModuleInit {
   private readonly logger = new Logger(ProviderService.name);
   private registry!: ModelRegistry;
 
-  async onModuleInit(): Promise<void> {
-    const authStorage = AuthStorage.create();
+  onModuleInit(): void {
+    const authStorage = AuthStorage.inMemory();
     this.registry = new ModelRegistry(authStorage);
 
     this.registerOllamaProvider();
@@ -64,6 +65,63 @@ export class ProviderService implements OnModuleInit {
     return this.registry.getAvailable().map((m) => this.toModelInfo(m));
   }
 
+  async testConnection(providerId: string, baseUrl?: string): Promise<TestConnectionResultDto> {
+    // Resolve baseUrl: explicit override > registered provider > ollama env
+    let resolvedUrl = baseUrl;
+
+    if (!resolvedUrl) {
+      const allModels = this.registry.getAll();
+      const providerModels = allModels.filter((m) => m.provider === providerId);
+      if (providerModels.length === 0) {
+        return { providerId, reachable: false, error: `Provider '${providerId}' not found` };
+      }
+      // For Ollama, derive the base URL from environment
+      if (providerId === 'ollama') {
+        const ollamaUrl = process.env['OLLAMA_BASE_URL'] ?? process.env['OLLAMA_HOST'];
+        if (!ollamaUrl) {
+          return { providerId, reachable: false, error: 'OLLAMA_BASE_URL not configured' };
+        }
+        resolvedUrl = `${ollamaUrl}/v1/models`;
+      } else {
+        // For other providers, we can only do a basic check
+        return { providerId, reachable: true, discoveredModels: providerModels.map((m) => m.id) };
+      }
+    } else {
+      resolvedUrl = resolvedUrl.replace(/\/?$/, '') + '/models';
+    }
+
+    const start = Date.now();
+    try {
+      const res = await fetch(resolvedUrl, {
+        method: 'GET',
+        headers: { Accept: 'application/json' },
+        signal: AbortSignal.timeout(5000),
+      });
+
+      const latencyMs = Date.now() - start;
+
+      if (!res.ok) {
+        return { providerId, reachable: false, latencyMs, error: `HTTP ${res.status}` };
+      }
+
+      let discoveredModels: string[] | undefined;
+      try {
+        const json = (await res.json()) as { models?: Array<{ id?: string; name?: string }> };
+        if (Array.isArray(json.models)) {
+          discoveredModels = json.models.map((m) => m.id ?? m.name ?? '').filter(Boolean);
+        }
+      } catch {
+        // ignore parse errors — endpoint was reachable
+      }
+
+      return { providerId, reachable: true, latencyMs, discoveredModels };
+    } catch (err) {
+      const latencyMs = Date.now() - start;
+      const message = err instanceof Error ? err.message : String(err);
+      return { providerId, reachable: false, latencyMs, error: message };
+    }
+  }
+
   registerCustomProvider(config: CustomProviderConfig): void {
     this.registry.registerProvider(config.id, {
       baseUrl: config.baseUrl,
@@ -89,17 +147,19 @@ export class ProviderService implements OnModuleInit {
     const modelsEnv = process.env['OLLAMA_MODELS'] ?? 'llama3.2,codellama,mistral';
     const modelIds = modelsEnv
       .split(',')
-      .map((m) => m.trim())
+      .map((modelId: string) => modelId.trim())
       .filter(Boolean);
 
-    this.registerCustomProvider({
-      id: 'ollama',
-      name: 'Ollama',
+    this.registry.registerProvider('ollama', {
       baseUrl: `${ollamaUrl}/v1`,
+      apiKey: 'ollama',
+      api: 'openai-completions' as never,
       models: modelIds.map((id) => ({
         id,
         name: id,
         reasoning: false,
+        input: ['text'] as ('text' | 'image')[],
+        cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
         contextWindow: 8192,
         maxTokens: 4096,
       })),

apps/gateway/src/agent/providers.controller.ts

@@ -3,6 +3,7 @@ import type { RoutingCriteria } from '@mosaic/types';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { ProviderService } from './provider.service.js';
 import { RoutingService } from './routing.service.js';
+import type { TestConnectionDto, TestConnectionResultDto } from './provider.dto.js';
 
 @Controller('api/providers')
 @UseGuards(AuthGuard)
@@ -22,6 +23,11 @@ export class ProvidersController {
     return this.providerService.listAvailableModels();
   }
 
+  @Post('test')
+  testConnection(@Body() body: TestConnectionDto): Promise<TestConnectionResultDto> {
+    return this.providerService.testConnection(body.providerId, body.baseUrl);
+  }
+
   @Post('route')
   route(@Body() criteria: RoutingCriteria) {
     return this.routingService.route(criteria);

apps/gateway/src/agent/routing.service.ts

@@ -145,8 +145,11 @@ export class RoutingService {
 
   private classifyTier(model: ModelInfo): CostTier {
     const cost = model.cost.input;
-    if (cost <= COST_TIER_THRESHOLDS.cheap.maxInput) return 'cheap';
-    if (cost <= COST_TIER_THRESHOLDS.standard.maxInput) return 'standard';
+    const cheapThreshold = COST_TIER_THRESHOLDS['cheap'];
+    const standardThreshold = COST_TIER_THRESHOLDS['standard'];
+
+    if (cost <= cheapThreshold.maxInput) return 'cheap';
+    if (cost <= standardThreshold.maxInput) return 'standard';
     return 'premium';
   }
 

apps/gateway/src/agent/session.dto.ts

@@ -12,3 +12,33 @@ export interface SessionListDto {
   sessions: SessionInfoDto[];
   total: number;
 }
+
+/**
+ * Options accepted when creating an agent session.
+ * All fields are optional; omitting them falls back to env-var or process defaults.
+ */
+export interface CreateSessionOptionsDto {
+  /** Provider name (e.g. "anthropic", "openai"). */
+  provider?: string;
+  /** Model ID to use for this session. */
+  modelId?: string;
+  /**
+   * Sandbox working directory for the session.
+   * File, git, and shell tools will be restricted to this directory.
+   * Defaults to AGENT_FILE_SANDBOX_DIR env var or process.cwd().
+   */
+  sandboxDir?: string;
+  /**
+   * Platform-level system prompt for this session.
+   * Merged with skill prompt additions (platform prompt first, then skills).
+   * Falls back to AGENT_SYSTEM_PROMPT env var when omitted.
+   */
+  systemPrompt?: string;
+  /**
+   * Explicit allowlist of tool names available in this session.
+   * When provided, only listed tools are registered with the agent.
+   * Admins receive all tools; regular users fall back to AGENT_USER_TOOLS
+   * env var (comma-separated) when this field is not supplied.
+   */
+  allowedTools?: string[];
+}

apps/gateway/src/agent/skill-loader.service.ts

@@ -0,0 +1,59 @@
+import { Inject, Injectable, Logger } from '@nestjs/common';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import { SkillsService } from '../skills/skills.service.js';
+import { createSkillTools } from './tools/skill-tools.js';
+
+export interface LoadedSkills {
+  /** Meta-tools: skill_list + skill_invoke */
+  metaTools: ToolDefinition[];
+  /**
+   * System prompt additions from enabled prompt-type skills.
+   * Callers may prepend these to the session system prompt.
+   */
+  promptAdditions: string[];
+}
+
+/**
+ * SkillLoaderService is responsible for:
+ * 1. Providing the skill meta-tools (skill_list, skill_invoke) to agent sessions.
+ * 2. Collecting system-prompt additions from enabled prompt-type skills.
+ */
+@Injectable()
+export class SkillLoaderService {
+  private readonly logger = new Logger(SkillLoaderService.name);
+
+  constructor(@Inject(SkillsService) private readonly skillsService: SkillsService) {}
+
+  /**
+   * Load enabled skills and return tools + prompt additions for a new session.
+   */
+  async loadForSession(): Promise<LoadedSkills> {
+    const metaTools = createSkillTools(this.skillsService);
+
+    let promptAdditions: string[] = [];
+    try {
+      const enabledSkills = await this.skillsService.findEnabled();
+      promptAdditions = enabledSkills.flatMap((skill) => {
+        const config = (skill.config ?? {}) as Record<string, unknown>;
+        const skillType = (config['type'] as string | undefined) ?? 'prompt';
+        if (skillType === 'prompt') {
+          const addition = (config['prompt'] as string | undefined) ?? skill.description;
+          return addition ? [addition] : [];
+        }
+        return [];
+      });
+
+      this.logger.log(
+        `Loaded ${enabledSkills.length} enabled skill(s), ` +
+          `${promptAdditions.length} prompt addition(s)`,
+      );
+    } catch (err) {
+      // Non-fatal: log and continue without prompt additions
+      this.logger.warn(
+        `Failed to load skill prompt additions: ${err instanceof Error ? err.message : String(err)}`,
+      );
+    }
+
+    return { metaTools, promptAdditions };
+  }
+}

apps/gateway/src/agent/tools/file-tools.ts

@@ -0,0 +1,194 @@
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import { readFile, writeFile, readdir, stat } from 'node:fs/promises';
+import { guardPath, guardPathUnsafe, SandboxEscapeError } from './path-guard.js';
+
+const MAX_READ_BYTES = 512 * 1024; // 512 KB read limit
+const MAX_WRITE_BYTES = 1024 * 1024; // 1 MB write limit
+
+export function createFileTools(baseDir: string): ToolDefinition[] {
+  const readFileTool: ToolDefinition = {
+    name: 'fs_read_file',
+    label: 'Read File',
+    description:
+      'Read the contents of a file. Path is resolved relative to the sandbox base directory.',
+    parameters: Type.Object({
+      path: Type.String({
+        description: 'File path (relative to sandbox base or absolute within it)',
+      }),
+      encoding: Type.Optional(
+        Type.String({ description: 'Encoding: utf8 (default), base64, hex' }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { path, encoding } = params as { path: string; encoding?: string };
+      let safePath: string;
+      try {
+        safePath = guardPath(path, baseDir);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+
+      try {
+        const info = await stat(safePath);
+        if (!info.isFile()) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: path is not a file: ${path}` }],
+            details: undefined,
+          };
+        }
+        if (info.size > MAX_READ_BYTES) {
+          return {
+            content: [
+              {
+                type: 'text' as const,
+                text: `Error: file too large (${info.size} bytes, limit ${MAX_READ_BYTES} bytes)`,
+              },
+            ],
+            details: undefined,
+          };
+        }
+        const enc = (encoding ?? 'utf8') as BufferEncoding;
+        const content = await readFile(safePath, { encoding: enc });
+        return {
+          content: [{ type: 'text' as const, text: String(content) }],
+          details: undefined,
+        };
+      } catch (err) {
+        return {
+          content: [{ type: 'text' as const, text: `Error reading file: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+    },
+  };
+
+  const writeFileTool: ToolDefinition = {
+    name: 'fs_write_file',
+    label: 'Write File',
+    description:
+      'Write content to a file. Path is resolved relative to the sandbox base directory. Overwrites existing file.',
+    parameters: Type.Object({
+      path: Type.String({
+        description: 'File path (relative to sandbox base or absolute within it)',
+      }),
+      content: Type.String({ description: 'Content to write' }),
+      encoding: Type.Optional(Type.String({ description: 'Encoding: utf8 (default), base64' })),
+    }),
+    async execute(_toolCallId, params) {
+      const { path, content, encoding } = params as {
+        path: string;
+        content: string;
+        encoding?: string;
+      };
+      let safePath: string;
+      try {
+        safePath = guardPathUnsafe(path, baseDir);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+
+      if (Buffer.byteLength(content, 'utf8') > MAX_WRITE_BYTES) {
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: `Error: content too large (limit ${MAX_WRITE_BYTES} bytes)`,
+            },
+          ],
+          details: undefined,
+        };
+      }
+
+      try {
+        const enc = (encoding ?? 'utf8') as BufferEncoding;
+        await writeFile(safePath, content, { encoding: enc });
+        return {
+          content: [{ type: 'text' as const, text: `File written successfully: ${path}` }],
+          details: undefined,
+        };
+      } catch (err) {
+        return {
+          content: [{ type: 'text' as const, text: `Error writing file: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+    },
+  };
+
+  const listDirectoryTool: ToolDefinition = {
+    name: 'fs_list_directory',
+    label: 'List Directory',
+    description: 'List files and directories at a given path within the sandbox base directory.',
+    parameters: Type.Object({
+      path: Type.Optional(
+        Type.String({
+          description: 'Directory path (relative to sandbox base). Defaults to base directory.',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { path } = params as { path?: string };
+      const target = path ?? '.';
+      let safePath: string;
+      try {
+        safePath = guardPath(target, baseDir);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+
+      try {
+        const info = await stat(safePath);
+        if (!info.isDirectory()) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: path is not a directory: ${target}` }],
+            details: undefined,
+          };
+        }
+        const entries = await readdir(safePath, { withFileTypes: true });
+        const items = entries.map((e) => ({
+          name: e.name,
+          type: e.isDirectory() ? 'directory' : e.isSymbolicLink() ? 'symlink' : 'file',
+        }));
+        return {
+          content: [{ type: 'text' as const, text: JSON.stringify(items, null, 2) }],
+          details: undefined,
+        };
+      } catch (err) {
+        return {
+          content: [{ type: 'text' as const, text: `Error listing directory: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+    },
+  };
+
+  return [readFileTool, writeFileTool, listDirectoryTool];
+}

apps/gateway/src/agent/tools/git-tools.ts

@@ -0,0 +1,212 @@
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import { exec } from 'node:child_process';
+import { promisify } from 'node:util';
+import { guardPath, guardPathUnsafe, SandboxEscapeError } from './path-guard.js';
+
+const execAsync = promisify(exec);
+
+const GIT_TIMEOUT_MS = 15_000;
+const MAX_OUTPUT_BYTES = 100 * 1024; // 100 KB
+
+async function runGit(
+  args: string[],
+  cwd?: string,
+): Promise<{ stdout: string; stderr: string; error?: string }> {
+  // Only allow specific safe read-only git subcommands
+  const allowedSubcommands = ['status', 'log', 'diff', 'show', 'branch', 'tag', 'ls-files'];
+  const subcommand = args[0];
+  if (!subcommand || !allowedSubcommands.includes(subcommand)) {
+    return {
+      stdout: '',
+      stderr: '',
+      error: `Blocked: git subcommand "${subcommand}" is not allowed. Permitted: ${allowedSubcommands.join(', ')}`,
+    };
+  }
+
+  const cmd = `git ${args.map((a) => JSON.stringify(a)).join(' ')}`;
+  try {
+    const { stdout, stderr } = await execAsync(cmd, {
+      cwd,
+      timeout: GIT_TIMEOUT_MS,
+      maxBuffer: MAX_OUTPUT_BYTES,
+    });
+    return { stdout, stderr };
+  } catch (err: unknown) {
+    const e = err as { stdout?: string; stderr?: string; message?: string };
+    return {
+      stdout: e.stdout ?? '',
+      stderr: e.stderr ?? '',
+      error: e.message ?? String(err),
+    };
+  }
+}
+
+export function createGitTools(sandboxDir?: string): ToolDefinition[] {
+  const defaultCwd = sandboxDir ?? process.cwd();
+
+  const gitStatus: ToolDefinition = {
+    name: 'git_status',
+    label: 'Git Status',
+    description: 'Show the working tree status (staged, unstaged, untracked files).',
+    parameters: Type.Object({
+      cwd: Type.Optional(
+        Type.String({
+          description: 'Repository working directory (relative to sandbox or absolute within it).',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { cwd } = params as { cwd?: string };
+      let safeCwd: string;
+      try {
+        safeCwd = guardPath(cwd ?? '.', defaultCwd);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+      const result = await runGit(['status', '--short', '--branch'], safeCwd);
+      const text = result.error
+        ? `Error: ${result.error}\n${result.stderr}`
+        : result.stdout || '(no output)';
+      return {
+        content: [{ type: 'text' as const, text: text }],
+        details: undefined,
+      };
+    },
+  };
+
+  const gitLog: ToolDefinition = {
+    name: 'git_log',
+    label: 'Git Log',
+    description: 'Show recent commit history.',
+    parameters: Type.Object({
+      limit: Type.Optional(Type.Number({ description: 'Number of commits to show (default 20)' })),
+      oneline: Type.Optional(
+        Type.Boolean({ description: 'Compact one-line format (default true)' }),
+      ),
+      cwd: Type.Optional(
+        Type.String({
+          description: 'Repository working directory (relative to sandbox or absolute within it).',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { limit, oneline, cwd } = params as {
+        limit?: number;
+        oneline?: boolean;
+        cwd?: string;
+      };
+      let safeCwd: string;
+      try {
+        safeCwd = guardPath(cwd ?? '.', defaultCwd);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+      const args = ['log', `--max-count=${limit ?? 20}`];
+      if (oneline !== false) args.push('--oneline');
+      const result = await runGit(args, safeCwd);
+      const text = result.error
+        ? `Error: ${result.error}\n${result.stderr}`
+        : result.stdout || '(no commits)';
+      return {
+        content: [{ type: 'text' as const, text: text }],
+        details: undefined,
+      };
+    },
+  };
+
+  const gitDiff: ToolDefinition = {
+    name: 'git_diff',
+    label: 'Git Diff',
+    description: 'Show changes between commits, working tree, or staged changes.',
+    parameters: Type.Object({
+      staged: Type.Optional(
+        Type.Boolean({ description: 'Show staged (cached) changes instead of unstaged' }),
+      ),
+      ref: Type.Optional(
+        Type.String({ description: 'Compare against this ref (commit SHA, branch, or tag)' }),
+      ),
+      path: Type.Optional(
+        Type.String({ description: 'Limit diff to a specific file or directory' }),
+      ),
+      cwd: Type.Optional(
+        Type.String({
+          description: 'Repository working directory (relative to sandbox or absolute within it).',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { staged, ref, path, cwd } = params as {
+        staged?: boolean;
+        ref?: string;
+        path?: string;
+        cwd?: string;
+      };
+      let safeCwd: string;
+      try {
+        safeCwd = guardPath(cwd ?? '.', defaultCwd);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+      let safePath: string | undefined;
+      if (path !== undefined) {
+        try {
+          safePath = guardPathUnsafe(path, defaultCwd);
+        } catch (err) {
+          if (err instanceof SandboxEscapeError) {
+            return {
+              content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+              details: undefined,
+            };
+          }
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+            details: undefined,
+          };
+        }
+      }
+      const args = ['diff'];
+      if (staged) args.push('--cached');
+      if (ref) args.push(ref);
+      args.push('--');
+      if (safePath !== undefined) args.push(safePath);
+      const result = await runGit(args, safeCwd);
+      const text = result.error
+        ? `Error: ${result.error}\n${result.stderr}`
+        : result.stdout || '(no diff)';
+      return {
+        content: [{ type: 'text' as const, text: text }],
+        details: undefined,
+      };
+    },
+  };
+
+  return [gitStatus, gitLog, gitDiff];
+}

apps/gateway/src/agent/tools/index.ts

@@ -1,2 +1,7 @@
 export { createBrainTools } from './brain-tools.js';
 export { createCoordTools } from './coord-tools.js';
+export { createFileTools } from './file-tools.js';
+export { createGitTools } from './git-tools.js';
+export { createShellTools } from './shell-tools.js';
+export { createWebTools } from './web-tools.js';
+export { createSkillTools } from './skill-tools.js';

apps/gateway/src/agent/tools/memory-tools.ts

@@ -0,0 +1,158 @@
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import type { Memory } from '@mosaic/memory';
+import type { EmbeddingProvider } from '@mosaic/memory';
+
+export function createMemoryTools(
+  memory: Memory,
+  embeddingProvider: EmbeddingProvider | null,
+): ToolDefinition[] {
+  const searchMemory: ToolDefinition = {
+    name: 'memory_search',
+    label: 'Search Memory',
+    description:
+      'Search across stored insights and knowledge using natural language. Returns semantically similar results.',
+    parameters: Type.Object({
+      userId: Type.String({ description: 'User ID to search memory for' }),
+      query: Type.String({ description: 'Natural language search query' }),
+      limit: Type.Optional(Type.Number({ description: 'Max results (default 5)' })),
+    }),
+    async execute(_toolCallId, params) {
+      const { userId, query, limit } = params as {
+        userId: string;
+        query: string;
+        limit?: number;
+      };
+
+      if (!embeddingProvider) {
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: 'Semantic search unavailable — no embedding provider configured',
+            },
+          ],
+          details: undefined,
+        };
+      }
+
+      const embedding = await embeddingProvider.embed(query);
+      const results = await memory.insights.searchByEmbedding(userId, embedding, limit ?? 5);
+      return {
+        content: [{ type: 'text' as const, text: JSON.stringify(results, null, 2) }],
+        details: undefined,
+      };
+    },
+  };
+
+  const getPreferences: ToolDefinition = {
+    name: 'memory_get_preferences',
+    label: 'Get User Preferences',
+    description: 'Retrieve stored preferences for a user.',
+    parameters: Type.Object({
+      userId: Type.String({ description: 'User ID' }),
+      category: Type.Optional(
+        Type.String({
+          description: 'Filter by category: communication, coding, workflow, appearance, general',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { userId, category } = params as { userId: string; category?: string };
+      type Cat = 'communication' | 'coding' | 'workflow' | 'appearance' | 'general';
+      const prefs = category
+        ? await memory.preferences.findByUserAndCategory(userId, category as Cat)
+        : await memory.preferences.findByUser(userId);
+      return {
+        content: [{ type: 'text' as const, text: JSON.stringify(prefs, null, 2) }],
+        details: undefined,
+      };
+    },
+  };
+
+  const savePreference: ToolDefinition = {
+    name: 'memory_save_preference',
+    label: 'Save User Preference',
+    description:
+      'Store a learned user preference (e.g., "prefers tables over paragraphs", "timezone: America/Chicago").',
+    parameters: Type.Object({
+      userId: Type.String({ description: 'User ID' }),
+      key: Type.String({ description: 'Preference key' }),
+      value: Type.String({ description: 'Preference value (JSON string)' }),
+      category: Type.Optional(
+        Type.String({
+          description: 'Category: communication, coding, workflow, appearance, general',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { userId, key, value, category } = params as {
+        userId: string;
+        key: string;
+        value: string;
+        category?: string;
+      };
+      type Cat = 'communication' | 'coding' | 'workflow' | 'appearance' | 'general';
+      let parsedValue: unknown;
+      try {
+        parsedValue = JSON.parse(value);
+      } catch {
+        parsedValue = value;
+      }
+      const pref = await memory.preferences.upsert({
+        userId,
+        key,
+        value: parsedValue,
+        category: (category as Cat) ?? 'general',
+        source: 'agent',
+      });
+      return {
+        content: [{ type: 'text' as const, text: JSON.stringify(pref, null, 2) }],
+        details: undefined,
+      };
+    },
+  };
+
+  const saveInsight: ToolDefinition = {
+    name: 'memory_save_insight',
+    label: 'Save Insight',
+    description:
+      'Store a learned insight, decision, or knowledge extracted from the current interaction.',
+    parameters: Type.Object({
+      userId: Type.String({ description: 'User ID' }),
+      content: Type.String({ description: 'The insight or knowledge to store' }),
+      category: Type.Optional(
+        Type.String({
+          description: 'Category: decision, learning, preference, fact, pattern, general',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { userId, content, category } = params as {
+        userId: string;
+        content: string;
+        category?: string;
+      };
+      type Cat = 'decision' | 'learning' | 'preference' | 'fact' | 'pattern' | 'general';
+
+      let embedding: number[] | null = null;
+      if (embeddingProvider) {
+        embedding = await embeddingProvider.embed(content);
+      }
+
+      const insight = await memory.insights.create({
+        userId,
+        content,
+        embedding,
+        source: 'agent',
+        category: (category as Cat) ?? 'learning',
+      });
+      return {
+        content: [{ type: 'text' as const, text: JSON.stringify(insight, null, 2) }],
+        details: undefined,
+      };
+    },
+  };
+
+  return [searchMemory, getPreferences, savePreference, saveInsight];
+}

apps/gateway/src/agent/tools/path-guard.test.ts

@@ -0,0 +1,104 @@
+import { describe, it, expect } from 'vitest';
+import { guardPath, guardPathUnsafe, SandboxEscapeError } from './path-guard.js';
+import path from 'node:path';
+import os from 'node:os';
+import fs from 'node:fs';
+
+describe('guardPathUnsafe', () => {
+  const sandbox = '/tmp/test-sandbox';
+
+  it('allows paths inside sandbox', () => {
+    const result = guardPathUnsafe('foo/bar.txt', sandbox);
+    expect(result).toBe(path.resolve(sandbox, 'foo/bar.txt'));
+  });
+
+  it('allows sandbox root itself', () => {
+    const result = guardPathUnsafe('.', sandbox);
+    expect(result).toBe(path.resolve(sandbox));
+  });
+
+  it('rejects path traversal with ../', () => {
+    expect(() => guardPathUnsafe('../escape.txt', sandbox)).toThrow(SandboxEscapeError);
+  });
+
+  it('rejects absolute path outside sandbox', () => {
+    expect(() => guardPathUnsafe('/etc/passwd', sandbox)).toThrow(SandboxEscapeError);
+  });
+
+  it('rejects deeply nested traversal', () => {
+    expect(() => guardPathUnsafe('a/b/../../../../../../etc/passwd', sandbox)).toThrow(
+      SandboxEscapeError,
+    );
+  });
+
+  it('rejects path that starts with sandbox name but is sibling', () => {
+    expect(() => guardPathUnsafe('/tmp/test-sandbox-evil/file.txt', sandbox)).toThrow(
+      SandboxEscapeError,
+    );
+  });
+
+  it('returns the resolved absolute path for nested paths', () => {
+    const result = guardPathUnsafe('deep/nested/file.ts', sandbox);
+    expect(result).toBe('/tmp/test-sandbox/deep/nested/file.ts');
+  });
+
+  it('SandboxEscapeError includes the user path and sandbox in message', () => {
+    let caught: unknown;
+    try {
+      guardPathUnsafe('../escape.txt', sandbox);
+    } catch (err) {
+      caught = err;
+    }
+    expect(caught).toBeInstanceOf(SandboxEscapeError);
+    const e = caught as SandboxEscapeError;
+    expect(e.userPath).toBe('../escape.txt');
+    expect(e.sandboxDir).toBe(sandbox);
+    expect(e.message).toContain('Path escape attempt blocked');
+  });
+});
+
+describe('guardPath', () => {
+  let tmpDir: string;
+
+  it('allows an existing path inside a real temp sandbox', () => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'path-guard-test-'));
+    try {
+      const subdir = path.join(tmpDir, 'subdir');
+      fs.mkdirSync(subdir);
+      const result = guardPath('subdir', tmpDir);
+      expect(result).toBe(subdir);
+    } finally {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  });
+
+  it('allows sandbox root itself', () => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'path-guard-test-'));
+    try {
+      const result = guardPath('.', tmpDir);
+      // realpathSync resolves the tmpdir symlinks (macOS /var -> /private/var)
+      const realTmp = fs.realpathSync.native(tmpDir);
+      expect(result).toBe(realTmp);
+    } finally {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  });
+
+  it('rejects path traversal with ../ on existing sandbox', () => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'path-guard-test-'));
+    try {
+      expect(() => guardPath('../escape', tmpDir)).toThrow(SandboxEscapeError);
+    } finally {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  });
+
+  it('rejects absolute path outside sandbox', () => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'path-guard-test-'));
+    try {
+      expect(() => guardPath('/etc/passwd', tmpDir)).toThrow(SandboxEscapeError);
+    } finally {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  });
+});

apps/gateway/src/agent/tools/path-guard.ts

@@ -0,0 +1,58 @@
+import path from 'node:path';
+import fs from 'node:fs';
+
+/**
+ * Resolves a user-provided path and verifies it is inside the allowed sandbox directory.
+ * Throws SandboxEscapeError if the resolved path is outside the sandbox.
+ *
+ * Uses realpathSync to resolve symlinks in the sandbox root. The user-supplied path
+ * is checked for containment AFTER lexical resolution but BEFORE resolving any symlinks
+ * within the user path — so symlink escape attempts are caught too.
+ *
+ * @param userPath - The path provided by the agent (may be relative or absolute)
+ * @param sandboxDir - The allowed root directory (already validated on session creation)
+ * @returns The resolved absolute path, guaranteed to be within sandboxDir
+ */
+export function guardPath(userPath: string, sandboxDir: string): string {
+  const resolved = path.resolve(sandboxDir, userPath);
+  const sandboxResolved = fs.realpathSync.native(sandboxDir);
+
+  // Normalize both paths to resolve any symlinks in the sandbox root itself.
+  // For the user path, we check containment BEFORE resolving symlinks in the path
+  // (so we catch symlink escape attempts too — the resolved path must still be under sandbox)
+  if (!resolved.startsWith(sandboxResolved + path.sep) && resolved !== sandboxResolved) {
+    throw new SandboxEscapeError(userPath, sandboxDir, resolved);
+  }
+
+  return resolved;
+}
+
+/**
+ * Validates a path without resolving symlinks in the user-provided portion.
+ * Use for paths that may not exist yet (creates, writes).
+ *
+ * Performs a lexical containment check only using path.resolve.
+ */
+export function guardPathUnsafe(userPath: string, sandboxDir: string): string {
+  const resolved = path.resolve(sandboxDir, userPath);
+  const sandboxAbs = path.resolve(sandboxDir);
+
+  if (!resolved.startsWith(sandboxAbs + path.sep) && resolved !== sandboxAbs) {
+    throw new SandboxEscapeError(userPath, sandboxDir, resolved);
+  }
+
+  return resolved;
+}
+
+export class SandboxEscapeError extends Error {
+  constructor(
+    public readonly userPath: string,
+    public readonly sandboxDir: string,
+    public readonly resolvedPath: string,
+  ) {
+    super(
+      `Path escape attempt blocked: "${userPath}" resolves to "${resolvedPath}" which is outside sandbox "${sandboxDir}"`,
+    );
+    this.name = 'SandboxEscapeError';
+  }
+}

apps/gateway/src/agent/tools/shell-tools.ts

@@ -0,0 +1,218 @@
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import { spawn } from 'node:child_process';
+import { guardPath, SandboxEscapeError } from './path-guard.js';
+
+const DEFAULT_TIMEOUT_MS = 30_000;
+const MAX_OUTPUT_BYTES = 100 * 1024; // 100 KB
+
+/**
+ * Commands that are outright blocked for safety.
+ * This is a denylist; the agent should be instructed to use
+ * the least-privilege command necessary.
+ */
+const BLOCKED_COMMANDS = new Set([
+  'rm',
+  'rmdir',
+  'mkfs',
+  'dd',
+  'format',
+  'fdisk',
+  'parted',
+  'shred',
+  'wipefs',
+  'sudo',
+  'su',
+  'chown',
+  'chmod',
+  'passwd',
+  'useradd',
+  'userdel',
+  'groupadd',
+  'shutdown',
+  'reboot',
+  'halt',
+  'poweroff',
+  'kill',
+  'killall',
+  'pkill',
+  'curl',
+  'wget',
+  'nc',
+  'netcat',
+  'ncat',
+  'ssh',
+  'scp',
+  'sftp',
+  'rsync',
+  'iptables',
+  'ip6tables',
+  'nft',
+  'ufw',
+  'firewall-cmd',
+  'docker',
+  'podman',
+  'kubectl',
+  'helm',
+  'terraform',
+  'ansible',
+  'crontab',
+  'at',
+  'batch',
+]);
+
+function extractBaseCommand(command: string): string {
+  // Extract the first word (the binary name), stripping path
+  const trimmed = command.trim();
+  const firstToken = trimmed.split(/\s+/)[0] ?? '';
+  return firstToken.split('/').pop() ?? firstToken;
+}
+
+function runCommand(
+  command: string,
+  options: { timeoutMs: number; cwd?: string },
+): Promise<{ stdout: string; stderr: string; exitCode: number | null; timedOut: boolean }> {
+  return new Promise((resolve) => {
+    const child = spawn('sh', ['-c', command], {
+      cwd: options.cwd,
+      stdio: ['ignore', 'pipe', 'pipe'],
+      detached: false,
+    });
+
+    let stdout = '';
+    let stderr = '';
+    let timedOut = false;
+    let totalBytes = 0;
+    let truncated = false;
+
+    child.stdout?.on('data', (chunk: Buffer) => {
+      if (truncated) return;
+      totalBytes += chunk.length;
+      if (totalBytes > MAX_OUTPUT_BYTES) {
+        stdout += chunk.subarray(0, MAX_OUTPUT_BYTES - (totalBytes - chunk.length)).toString();
+        stdout += '\n[output truncated at 100 KB limit]';
+        truncated = true;
+        child.kill('SIGTERM');
+      } else {
+        stdout += chunk.toString();
+      }
+    });
+
+    child.stderr?.on('data', (chunk: Buffer) => {
+      if (stderr.length < MAX_OUTPUT_BYTES) {
+        stderr += chunk.toString();
+      }
+    });
+
+    const timer = setTimeout(() => {
+      timedOut = true;
+      child.kill('SIGTERM');
+      setTimeout(() => {
+        try {
+          child.kill('SIGKILL');
+        } catch {
+          // already exited
+        }
+      }, 2000);
+    }, options.timeoutMs);
+
+    child.on('close', (exitCode) => {
+      clearTimeout(timer);
+      resolve({ stdout, stderr, exitCode, timedOut });
+    });
+
+    child.on('error', (err) => {
+      clearTimeout(timer);
+      resolve({ stdout, stderr: stderr + String(err), exitCode: null, timedOut: false });
+    });
+  });
+}
+
+export function createShellTools(sandboxDir?: string): ToolDefinition[] {
+  const defaultCwd = sandboxDir ?? process.cwd();
+
+  const shellExec: ToolDefinition = {
+    name: 'shell_exec',
+    label: 'Shell Execute',
+    description:
+      'Execute a shell command with timeout and output limits. Dangerous commands (rm, sudo, docker, etc.) are blocked. Working directory is restricted to the session sandbox.',
+    parameters: Type.Object({
+      command: Type.String({ description: 'Shell command to execute' }),
+      cwd: Type.Optional(
+        Type.String({
+          description:
+            'Working directory for the command (relative to sandbox or absolute within it).',
+        }),
+      ),
+      timeout: Type.Optional(
+        Type.Number({ description: 'Timeout in milliseconds (default 30000, max 60000)' }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { command, cwd, timeout } = params as {
+        command: string;
+        cwd?: string;
+        timeout?: number;
+      };
+
+      const base = extractBaseCommand(command);
+      if (BLOCKED_COMMANDS.has(base)) {
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: `Error: command "${base}" is blocked for safety reasons.`,
+            },
+          ],
+          details: undefined,
+        };
+      }
+
+      const timeoutMs = Math.min(timeout ?? DEFAULT_TIMEOUT_MS, 60_000);
+      let safeCwd: string;
+      try {
+        safeCwd = guardPath(cwd ?? '.', defaultCwd);
+      } catch (err) {
+        if (err instanceof SandboxEscapeError) {
+          return {
+            content: [{ type: 'text' as const, text: `Error: ${err.message}` }],
+            details: undefined,
+          };
+        }
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${String(err)}` }],
+          details: undefined,
+        };
+      }
+
+      const result = await runCommand(command, {
+        timeoutMs,
+        cwd: safeCwd,
+      });
+
+      if (result.timedOut) {
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: `Command timed out after ${timeoutMs}ms.\nPartial stdout:\n${result.stdout}\nPartial stderr:\n${result.stderr}`,
+            },
+          ],
+          details: undefined,
+        };
+      }
+
+      const parts: string[] = [];
+      if (result.stdout) parts.push(`stdout:\n${result.stdout}`);
+      if (result.stderr) parts.push(`stderr:\n${result.stderr}`);
+      parts.push(`exit code: ${result.exitCode ?? 'null'}`);
+
+      return {
+        content: [{ type: 'text' as const, text: parts.join('\n') }],
+        details: undefined,
+      };
+    },
+  };
+
+  return [shellExec];
+}

apps/gateway/src/agent/tools/skill-tools.ts

@@ -0,0 +1,180 @@
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import type { SkillsService } from '../../skills/skills.service.js';
+
+/**
+ * Creates meta-tools that allow agents to list and invoke skills from the catalog.
+ *
+ * skill_list  — list all enabled skills
+ * skill_invoke — execute a skill by name with parameters
+ */
+export function createSkillTools(skillsService: SkillsService): ToolDefinition[] {
+  const skillList: ToolDefinition = {
+    name: 'skill_list',
+    label: 'List Skills',
+    description:
+      'List all enabled skills available in the catalog. Returns name, description, type, and config for each skill.',
+    parameters: Type.Object({}),
+    async execute() {
+      const skills = await skillsService.findEnabled();
+      const summary = skills.map((s) => ({
+        name: s.name,
+        description: s.description,
+        version: s.version,
+        source: s.source,
+        config: s.config,
+      }));
+      return {
+        content: [
+          {
+            type: 'text' as const,
+            text:
+              summary.length > 0
+                ? JSON.stringify(summary, null, 2)
+                : 'No enabled skills found in catalog.',
+          },
+        ],
+        details: undefined,
+      };
+    },
+  };
+
+  const skillInvoke: ToolDefinition = {
+    name: 'skill_invoke',
+    label: 'Invoke Skill',
+    description:
+      'Invoke a skill from the catalog by name. For prompt skills, returns the prompt addition. ' +
+      'For tool skills, executes the embedded logic. For workflow skills, returns the workflow steps.',
+    parameters: Type.Object({
+      name: Type.String({ description: 'Skill name to invoke' }),
+      params: Type.Optional(
+        Type.Record(Type.String(), Type.Unknown(), {
+          description: 'Parameters to pass to the skill (if applicable)',
+        }),
+      ),
+    }),
+    async execute(_toolCallId, rawParams) {
+      const { name, params } = rawParams as {
+        name: string;
+        params?: Record<string, unknown>;
+      };
+
+      const skill = await skillsService.findByName(name);
+      if (!skill) {
+        return {
+          content: [{ type: 'text' as const, text: `Skill not found: ${name}` }],
+          details: undefined,
+        };
+      }
+
+      if (!skill.enabled) {
+        return {
+          content: [{ type: 'text' as const, text: `Skill is disabled: ${name}` }],
+          details: undefined,
+        };
+      }
+
+      const config = (skill.config ?? {}) as Record<string, unknown>;
+      const skillType = (config['type'] as string | undefined) ?? 'prompt';
+
+      switch (skillType) {
+        case 'prompt': {
+          const promptAddition =
+            (config['prompt'] as string | undefined) ?? skill.description ?? '';
+          return {
+            content: [
+              {
+                type: 'text' as const,
+                text: promptAddition
+                  ? `[Skill: ${name}] ${promptAddition}`
+                  : `[Skill: ${name}] No prompt content defined.`,
+              },
+            ],
+            details: undefined,
+          };
+        }
+
+        case 'tool': {
+          const toolLogic = config['logic'] as string | undefined;
+          if (!toolLogic) {
+            return {
+              content: [
+                {
+                  type: 'text' as const,
+                  text: `[Skill: ${name}] Tool skill has no logic defined.`,
+                },
+              ],
+              details: undefined,
+            };
+          }
+          // Inline tool skill execution: the logic field holds a JS expression or template
+          // For safety, treat it as a template that can reference params
+          const result = renderTemplate(toolLogic, { params: params ?? {}, skill });
+          return {
+            content: [{ type: 'text' as const, text: `[Skill: ${name}]\n${result}` }],
+            details: undefined,
+          };
+        }
+
+        case 'workflow': {
+          const steps = config['steps'] as unknown[] | undefined;
+          if (!steps || steps.length === 0) {
+            return {
+              content: [
+                {
+                  type: 'text' as const,
+                  text: `[Skill: ${name}] Workflow has no steps defined.`,
+                },
+              ],
+              details: undefined,
+            };
+          }
+          return {
+            content: [
+              {
+                type: 'text' as const,
+                text: `[Skill: ${name}] Workflow steps:\n${JSON.stringify(steps, null, 2)}`,
+              },
+            ],
+            details: undefined,
+          };
+        }
+
+        default: {
+          // Unknown type — return full config so the agent can decide what to do
+          return {
+            content: [
+              {
+                type: 'text' as const,
+                text: `[Skill: ${name}] (type: ${skillType})\n${JSON.stringify(config, null, 2)}`,
+              },
+            ],
+            details: undefined,
+          };
+        }
+      }
+    },
+  };
+
+  return [skillList, skillInvoke];
+}
+
+/**
+ * Minimal template renderer — replaces {{key}} with values from the context.
+ * Used for tool skill logic templates.
+ */
+function renderTemplate(template: string, context: Record<string, unknown>): string {
+  return template.replace(/\{\{(\w+(?:\.\w+)*)\}\}/g, (_match, path: string) => {
+    const parts = path.split('.');
+    let value: unknown = context;
+    for (const part of parts) {
+      if (value != null && typeof value === 'object') {
+        value = (value as Record<string, unknown>)[part];
+      } else {
+        value = undefined;
+        break;
+      }
+    }
+    return value !== undefined && value !== null ? String(value) : '';
+  });
+}

apps/gateway/src/agent/tools/web-tools.ts

@@ -0,0 +1,225 @@
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+
+const DEFAULT_TIMEOUT_MS = 15_000;
+const MAX_RESPONSE_BYTES = 512 * 1024; // 512 KB
+
+/**
+ * Blocked URL patterns (private IP ranges, localhost, link-local).
+ */
+const BLOCKED_HOSTNAMES = [
+  /^localhost$/i,
+  /^127\./,
+  /^10\./,
+  /^172\.(1[6-9]|2\d|3[01])\./,
+  /^192\.168\./,
+  /^::1$/,
+  /^fc[0-9a-f][0-9a-f]:/i,
+  /^fe80:/i,
+  /^0\.0\.0\.0$/,
+  /^169\.254\./,
+];
+
+function isBlockedUrl(urlString: string): string | null {
+  let parsed: URL;
+  try {
+    parsed = new URL(urlString);
+  } catch {
+    return `Invalid URL: ${urlString}`;
+  }
+  if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
+    return `Unsupported protocol: ${parsed.protocol}. Only http and https are allowed.`;
+  }
+  const hostname = parsed.hostname;
+  for (const pattern of BLOCKED_HOSTNAMES) {
+    if (pattern.test(hostname)) {
+      return `Blocked: requests to "${hostname}" are not allowed (private/local addresses).`;
+    }
+  }
+  return null;
+}
+
+async function fetchWithLimit(
+  url: string,
+  options: RequestInit,
+  timeoutMs: number,
+): Promise<{ text: string; status: number; contentType: string }> {
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), timeoutMs);
+
+  try {
+    const response = await fetch(url, { ...options, signal: controller.signal });
+    const contentType = response.headers.get('content-type') ?? '';
+
+    // Stream response and enforce size limit
+    const reader = response.body?.getReader();
+    if (!reader) {
+      return { text: '', status: response.status, contentType };
+    }
+
+    const chunks: Uint8Array[] = [];
+    let totalBytes = 0;
+    let truncated = false;
+
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) break;
+      totalBytes += value.length;
+      if (totalBytes > MAX_RESPONSE_BYTES) {
+        const remaining = MAX_RESPONSE_BYTES - (totalBytes - value.length);
+        chunks.push(value.subarray(0, remaining));
+        truncated = true;
+        reader.cancel();
+        break;
+      }
+      chunks.push(value);
+    }
+
+    const combined = new Uint8Array(chunks.reduce((acc, c) => acc + c.length, 0));
+    let offset = 0;
+    for (const chunk of chunks) {
+      combined.set(chunk, offset);
+      offset += chunk.length;
+    }
+
+    let text = new TextDecoder().decode(combined);
+    if (truncated) {
+      text += '\n[response truncated at 512 KB limit]';
+    }
+
+    return { text, status: response.status, contentType };
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
+export function createWebTools(): ToolDefinition[] {
+  const webGet: ToolDefinition = {
+    name: 'web_get',
+    label: 'HTTP GET',
+    description:
+      'Perform an HTTP GET request and return the response body. Private/local addresses are blocked.',
+    parameters: Type.Object({
+      url: Type.String({ description: 'URL to fetch (http/https only)' }),
+      headers: Type.Optional(
+        Type.Record(Type.String(), Type.String(), {
+          description: 'Optional request headers as key-value pairs',
+        }),
+      ),
+      timeout: Type.Optional(
+        Type.Number({ description: 'Timeout in milliseconds (default 15000, max 30000)' }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { url, headers, timeout } = params as {
+        url: string;
+        headers?: Record<string, string>;
+        timeout?: number;
+      };
+
+      const blocked = isBlockedUrl(url);
+      if (blocked) {
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${blocked}` }],
+          details: undefined,
+        };
+      }
+
+      const timeoutMs = Math.min(timeout ?? DEFAULT_TIMEOUT_MS, 30_000);
+
+      try {
+        const result = await fetchWithLimit(
+          url,
+          { method: 'GET', headers: headers ?? {} },
+          timeoutMs,
+        );
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: `HTTP ${result.status} (${result.contentType})\n\n${result.text}`,
+            },
+          ],
+          details: undefined,
+        };
+      } catch (err) {
+        const msg = err instanceof Error ? err.message : String(err);
+        return {
+          content: [{ type: 'text' as const, text: `Error fetching URL: ${msg}` }],
+          details: undefined,
+        };
+      }
+    },
+  };
+
+  const webPost: ToolDefinition = {
+    name: 'web_post',
+    label: 'HTTP POST',
+    description:
+      'Perform an HTTP POST request with a JSON or text body. Private/local addresses are blocked.',
+    parameters: Type.Object({
+      url: Type.String({ description: 'URL to POST to (http/https only)' }),
+      body: Type.String({ description: 'Request body (JSON string or plain text)' }),
+      contentType: Type.Optional(
+        Type.String({ description: 'Content-Type header (default: application/json)' }),
+      ),
+      headers: Type.Optional(
+        Type.Record(Type.String(), Type.String(), {
+          description: 'Optional additional request headers',
+        }),
+      ),
+      timeout: Type.Optional(
+        Type.Number({ description: 'Timeout in milliseconds (default 15000, max 30000)' }),
+      ),
+    }),
+    async execute(_toolCallId, params) {
+      const { url, body, contentType, headers, timeout } = params as {
+        url: string;
+        body: string;
+        contentType?: string;
+        headers?: Record<string, string>;
+        timeout?: number;
+      };
+
+      const blocked = isBlockedUrl(url);
+      if (blocked) {
+        return {
+          content: [{ type: 'text' as const, text: `Error: ${blocked}` }],
+          details: undefined,
+        };
+      }
+
+      const timeoutMs = Math.min(timeout ?? DEFAULT_TIMEOUT_MS, 30_000);
+      const ct = contentType ?? 'application/json';
+
+      try {
+        const result = await fetchWithLimit(
+          url,
+          {
+            method: 'POST',
+            headers: { 'Content-Type': ct, ...(headers ?? {}) },
+            body,
+          },
+          timeoutMs,
+        );
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: `HTTP ${result.status} (${result.contentType})\n\n${result.text}`,
+            },
+          ],
+          details: undefined,
+        };
+      } catch (err) {
+        const msg = err instanceof Error ? err.message : String(err);
+        return {
+          content: [{ type: 'text' as const, text: `Error posting to URL: ${msg}` }],
+          details: undefined,
+        };
+      }
+    },
+  };
+
+  return [webGet, webPost];
+}

apps/gateway/src/app.module.ts

@@ -1,4 +1,5 @@
 import { Module } from '@nestjs/common';
+import { APP_GUARD } from '@nestjs/core';
 import { HealthController } from './health/health.controller.js';
 import { DatabaseModule } from './database/database.module.js';
 import { AuthModule } from './auth/auth.module.js';
@@ -10,9 +11,22 @@ import { ProjectsModule } from './projects/projects.module.js';
 import { MissionsModule } from './missions/missions.module.js';
 import { TasksModule } from './tasks/tasks.module.js';
 import { CoordModule } from './coord/coord.module.js';
+import { MemoryModule } from './memory/memory.module.js';
+import { LogModule } from './log/log.module.js';
+import { SkillsModule } from './skills/skills.module.js';
+import { PluginModule } from './plugin/plugin.module.js';
+import { McpModule } from './mcp/mcp.module.js';
+import { AdminModule } from './admin/admin.module.js';
+import { CommandsModule } from './commands/commands.module.js';
+import { PreferencesModule } from './preferences/preferences.module.js';
+import { GCModule } from './gc/gc.module.js';
+import { ReloadModule } from './reload/reload.module.js';
+import { WorkspaceModule } from './workspace/workspace.module.js';
+import { ThrottlerGuard, ThrottlerModule } from '@nestjs/throttler';
 
 @Module({
   imports: [
+    ThrottlerModule.forRoot([{ name: 'default', ttl: 60_000, limit: 60 }]),
     DatabaseModule,
     AuthModule,
     BrainModule,
@@ -23,7 +37,24 @@ import { CoordModule } from './coord/coord.module.js';
     MissionsModule,
     TasksModule,
     CoordModule,
+    MemoryModule,
+    LogModule,
+    SkillsModule,
+    PluginModule,
+    McpModule,
+    AdminModule,
+    PreferencesModule,
+    CommandsModule,
+    GCModule,
+    ReloadModule,
+    WorkspaceModule,
   ],
   controllers: [HealthController],
+  providers: [
+    {
+      provide: APP_GUARD,
+      useClass: ThrottlerGuard,
+    },
+  ],
 })
 export class AppModule {}

apps/gateway/src/auth/auth.controller.ts

@@ -7,16 +7,17 @@ import { AUTH } from './auth.tokens.js';
 export function mountAuthHandler(app: NestFastifyApplication): void {
   const auth = app.get<Auth>(AUTH);
   const nodeHandler = toNodeHandler(auth);
+  const corsOrigin = process.env['GATEWAY_CORS_ORIGIN'] ?? 'http://localhost:3000';
 
   const fastify = app.getHttpAdapter().getInstance();
 
-  // Use Fastify's addHook to intercept auth requests at the raw HTTP level,
-  // before Fastify's body parser runs. This avoids conflicts with NestJS's
-  // custom content-type parser.
+  // BetterAuth is mounted at the raw HTTP level via Fastify's onRequest hook,
+  // bypassing NestJS middleware (including CORS). We must set CORS headers
+  // manually on the raw response before handing off to BetterAuth.
   fastify.addHook(
     'onRequest',
     (
-      req: { raw: IncomingMessage; url: string },
+      req: { raw: IncomingMessage; url: string; method: string },
       reply: { raw: ServerResponse; hijack: () => void },
       done: () => void,
     ) => {
@@ -25,6 +26,27 @@ export function mountAuthHandler(app: NestFastifyApplication): void {
         return;
       }
 
+      const origin = req.raw.headers.origin;
+      const allowed = corsOrigin.split(',').map((o) => o.trim());
+
+      if (origin && allowed.includes(origin)) {
+        reply.raw.setHeader('Access-Control-Allow-Origin', origin);
+        reply.raw.setHeader('Access-Control-Allow-Credentials', 'true');
+        reply.raw.setHeader(
+          'Access-Control-Allow-Methods',
+          'GET, POST, PUT, PATCH, DELETE, OPTIONS',
+        );
+        reply.raw.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization, Cookie');
+      }
+
+      // Handle preflight
+      if (req.method === 'OPTIONS') {
+        reply.hijack();
+        reply.raw.writeHead(204);
+        reply.raw.end();
+        return;
+      }
+
       reply.hijack();
       nodeHandler(req.raw as IncomingMessage, reply.raw as ServerResponse)
         .then(() => {

apps/gateway/src/auth/resource-ownership.ts

@@ -0,0 +1,11 @@
+import { ForbiddenException } from '@nestjs/common';
+
+export function assertOwner(
+  ownerId: string | null | undefined,
+  userId: string,
+  resourceName: string,
+): void {
+  if (!ownerId || ownerId !== userId) {
+    throw new ForbiddenException(`${resourceName} does not belong to the current user`);
+  }
+}

apps/gateway/src/chat/__tests__/chat-security.test.ts

@@ -0,0 +1,80 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { validateSync } from 'class-validator';
+import { describe, expect, it, vi } from 'vitest';
+import { SendMessageDto } from '../../conversations/conversations.dto.js';
+import { ChatRequestDto } from '../chat.dto.js';
+import { validateSocketSession } from '../chat.gateway-auth.js';
+
+describe('Chat controller source hardening', () => {
+  it('applies AuthGuard and reads the current user', () => {
+    const source = readFileSync(resolve('src/chat/chat.controller.ts'), 'utf8');
+
+    expect(source).toContain('@UseGuards(AuthGuard)');
+    expect(source).toContain('@CurrentUser() user: { id: string }');
+  });
+});
+
+describe('WebSocket session authentication', () => {
+  it('returns null when the handshake does not resolve to a session', async () => {
+    const result = await validateSocketSession(
+      {},
+      {
+        api: {
+          getSession: vi.fn().mockResolvedValue(null),
+        },
+      },
+    );
+
+    expect(result).toBeNull();
+  });
+
+  it('returns the resolved session when Better Auth accepts the headers', async () => {
+    const session = { user: { id: 'user-1' }, session: { id: 'session-1' } };
+
+    const result = await validateSocketSession(
+      { cookie: 'session=abc' },
+      {
+        api: {
+          getSession: vi.fn().mockResolvedValue(session),
+        },
+      },
+    );
+
+    expect(result).toEqual(session);
+  });
+});
+
+describe('Chat DTO validation', () => {
+  it('rejects unsupported message roles', () => {
+    const dto = Object.assign(new SendMessageDto(), {
+      content: 'hello',
+      role: 'moderator',
+    });
+
+    const errors = validateSync(dto);
+
+    expect(errors.length).toBeGreaterThan(0);
+  });
+
+  it('rejects oversized conversation message content above 10000 characters', () => {
+    const dto = Object.assign(new SendMessageDto(), {
+      content: 'x'.repeat(10_001),
+      role: 'user',
+    });
+
+    const errors = validateSync(dto);
+
+    expect(errors.length).toBeGreaterThan(0);
+  });
+
+  it('rejects oversized chat content above 10000 characters', () => {
+    const dto = Object.assign(new ChatRequestDto(), {
+      content: 'x'.repeat(10_001),
+    });
+
+    const errors = validateSync(dto);
+
+    expect(errors.length).toBeGreaterThan(0);
+  });
+});

apps/gateway/src/chat/chat.controller.ts

@@ -1,12 +1,20 @@
-import { Controller, Post, Body, Logger, HttpException, HttpStatus, Inject } from '@nestjs/common';
+import {
+  Controller,
+  Post,
+  Body,
+  Logger,
+  HttpException,
+  HttpStatus,
+  Inject,
+  UseGuards,
+} from '@nestjs/common';
 import type { AgentSessionEvent } from '@mariozechner/pi-coding-agent';
+import { Throttle } from '@nestjs/throttler';
 import { AgentService } from '../agent/agent.service.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
 import { v4 as uuid } from 'uuid';
-
-interface ChatRequest {
-  conversationId?: string;
-  content: string;
-}
+import { ChatRequestDto } from './chat.dto.js';
 
 interface ChatResponse {
   conversationId: string;
@@ -14,13 +22,18 @@ interface ChatResponse {
 }
 
 @Controller('api/chat')
+@UseGuards(AuthGuard)
 export class ChatController {
   private readonly logger = new Logger(ChatController.name);
 
   constructor(@Inject(AgentService) private readonly agentService: AgentService) {}
 
   @Post()
-  async chat(@Body() body: ChatRequest): Promise<ChatResponse> {
+  @Throttle({ default: { limit: 10, ttl: 60_000 } })
+  async chat(
+    @Body() body: ChatRequestDto,
+    @CurrentUser() user: { id: string },
+  ): Promise<ChatResponse> {
     const conversationId = body.conversationId ?? uuid();
 
     try {
@@ -36,6 +49,8 @@ export class ChatController {
       throw new HttpException('Agent session unavailable', HttpStatus.SERVICE_UNAVAILABLE);
     }
 
+    this.logger.debug(`Handling chat request for user=${user.id}, conversation=${conversationId}`);
+
     let responseText = '';
 
     const done = new Promise<void>((resolve, reject) => {

apps/gateway/src/chat/chat.dto.ts

@@ -0,0 +1,35 @@
+import { IsOptional, IsString, IsUUID, MaxLength } from 'class-validator';
+
+export class ChatRequestDto {
+  @IsOptional()
+  @IsUUID()
+  conversationId?: string;
+
+  @IsString()
+  @MaxLength(10_000)
+  content!: string;
+}
+
+export class ChatSocketMessageDto {
+  @IsOptional()
+  @IsUUID()
+  conversationId?: string;
+
+  @IsString()
+  @MaxLength(10_000)
+  content!: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  provider?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  modelId?: string;
+
+  @IsOptional()
+  @IsUUID()
+  agentId?: string;
+}

apps/gateway/src/chat/chat.gateway-auth.ts

@@ -0,0 +1,30 @@
+import type { IncomingHttpHeaders } from 'node:http';
+import { fromNodeHeaders } from 'better-auth/node';
+
+export interface SocketSessionResult {
+  session: unknown;
+  user: { id: string };
+}
+
+export interface SessionAuth {
+  api: {
+    getSession(context: { headers: Headers }): Promise<SocketSessionResult | null>;
+  };
+}
+
+export async function validateSocketSession(
+  headers: IncomingHttpHeaders,
+  auth: SessionAuth,
+): Promise<SocketSessionResult | null> {
+  const sessionHeaders = fromNodeHeaders(headers);
+  const result = await auth.api.getSession({ headers: sessionHeaders });
+
+  if (!result) {
+    return null;
+  }
+
+  return {
+    session: result.session,
+    user: { id: result.user.id },
+  };
+}

apps/gateway/src/chat/chat.gateway.ts

@@ -11,18 +11,20 @@ import {
 } from '@nestjs/websockets';
 import { Server, Socket } from 'socket.io';
 import type { AgentSessionEvent } from '@mariozechner/pi-coding-agent';
+import type { Auth } from '@mosaic/auth';
+import type { SetThinkingPayload, SlashCommandPayload, SystemReloadPayload } from '@mosaic/types';
 import { AgentService } from '../agent/agent.service.js';
+import { AUTH } from '../auth/auth.tokens.js';
+import { CommandRegistryService } from '../commands/command-registry.service.js';
+import { CommandExecutorService } from '../commands/command-executor.service.js';
 import { v4 as uuid } from 'uuid';
-
-interface ChatMessage {
-  conversationId?: string;
-  content: string;
-  provider?: string;
-  modelId?: string;
-}
+import { ChatSocketMessageDto } from './chat.dto.js';
+import { validateSocketSession } from './chat.gateway-auth.js';
 
 @WebSocketGateway({
-  cors: { origin: '*' },
+  cors: {
+    origin: process.env['GATEWAY_CORS_ORIGIN'] ?? 'http://localhost:3000',
+  },
   namespace: '/chat',
 })
 export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {
@@ -35,14 +37,31 @@ export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewa
     { conversationId: string; cleanup: () => void }
   >();
 
-  constructor(@Inject(AgentService) private readonly agentService: AgentService) {}
+  constructor(
+    @Inject(AgentService) private readonly agentService: AgentService,
+    @Inject(AUTH) private readonly auth: Auth,
+    @Inject(CommandRegistryService) private readonly commandRegistry: CommandRegistryService,
+    @Inject(CommandExecutorService) private readonly commandExecutor: CommandExecutorService,
+  ) {}
 
   afterInit(): void {
     this.logger.log('Chat WebSocket gateway initialized');
   }
 
-  handleConnection(client: Socket): void {
+  async handleConnection(client: Socket): Promise<void> {
+    const session = await validateSocketSession(client.handshake.headers, this.auth);
+    if (!session) {
+      this.logger.warn(`Rejected unauthenticated WebSocket client: ${client.id}`);
+      client.disconnect();
+      return;
+    }
+
+    client.data.user = session.user;
+    client.data.session = session.session;
     this.logger.log(`Client connected: ${client.id}`);
+
+    // Broadcast command manifest to the newly connected client
+    client.emit('commands:manifest', { manifest: this.commandRegistry.getManifest() });
   }
 
   handleDisconnect(client: Socket): void {
@@ -58,7 +77,7 @@ export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewa
   @SubscribeMessage('message')
   async handleMessage(
     @ConnectedSocket() client: Socket,
-    @MessageBody() data: ChatMessage,
+    @MessageBody() data: ChatSocketMessageDto,
   ): Promise<void> {
     const conversationId = data.conversationId ?? uuid();
 
@@ -68,9 +87,12 @@ export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewa
     try {
       let agentSession = this.agentService.getSession(conversationId);
       if (!agentSession) {
+        const userId = (client.data.user as { id: string } | undefined)?.id;
         agentSession = await this.agentService.createSession(conversationId, {
           provider: data.provider,
           modelId: data.modelId,
+          agentConfigId: data.agentId,
+          userId,
         });
       }
     } catch (err) {
@@ -101,6 +123,21 @@ export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewa
     // Track channel connection
     this.agentService.addChannel(conversationId, `websocket:${client.id}`);
 
+    // Send session info so the client knows the model/provider
+    {
+      const agentSession = this.agentService.getSession(conversationId);
+      if (agentSession) {
+        const piSession = agentSession.piSession;
+        client.emit('session:info', {
+          conversationId,
+          provider: agentSession.provider,
+          modelId: agentSession.modelId,
+          thinkingLevel: piSession.thinkingLevel,
+          availableThinkingLevels: piSession.getAvailableThinkingLevels(),
+        });
+      }
+    }
+
     // Send acknowledgment
     client.emit('message:ack', { conversationId, messageId: uuid() });
 
@@ -119,6 +156,58 @@ export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewa
     }
   }
 
+  @SubscribeMessage('set:thinking')
+  handleSetThinking(
+    @ConnectedSocket() client: Socket,
+    @MessageBody() data: SetThinkingPayload,
+  ): void {
+    const session = this.agentService.getSession(data.conversationId);
+    if (!session) {
+      client.emit('error', {
+        conversationId: data.conversationId,
+        error: 'No active session for this conversation.',
+      });
+      return;
+    }
+
+    const validLevels = session.piSession.getAvailableThinkingLevels();
+    if (!validLevels.includes(data.level as never)) {
+      client.emit('error', {
+        conversationId: data.conversationId,
+        error: `Invalid thinking level "${data.level}". Available: ${validLevels.join(', ')}`,
+      });
+      return;
+    }
+
+    session.piSession.setThinkingLevel(data.level as never);
+    this.logger.log(
+      `Thinking level set to "${data.level}" for conversation ${data.conversationId}`,
+    );
+
+    client.emit('session:info', {
+      conversationId: data.conversationId,
+      provider: session.provider,
+      modelId: session.modelId,
+      thinkingLevel: session.piSession.thinkingLevel,
+      availableThinkingLevels: session.piSession.getAvailableThinkingLevels(),
+    });
+  }
+
+  @SubscribeMessage('command:execute')
+  async handleCommandExecute(
+    @ConnectedSocket() client: Socket,
+    @MessageBody() payload: SlashCommandPayload,
+  ): Promise<void> {
+    const userId = (client.data.user as { id: string } | undefined)?.id ?? 'unknown';
+    const result = await this.commandExecutor.execute(payload, userId);
+    client.emit('command:result', result);
+  }
+
+  broadcastReload(payload: SystemReloadPayload): void {
+    this.server.emit('system:reload', payload);
+    this.logger.log('Broadcasted system:reload to all connected clients');
+  }
+
   private relayEvent(client: Socket, conversationId: string, event: AgentSessionEvent): void {
     if (!client.connected) {
       this.logger.warn(
@@ -132,9 +221,31 @@ export class ChatGateway implements OnGatewayInit, OnGatewayConnection, OnGatewa
         client.emit('agent:start', { conversationId });
         break;
 
-      case 'agent_end':
-        client.emit('agent:end', { conversationId });
+      case 'agent_end': {
+        // Gather usage stats from the Pi session
+        const agentSession = this.agentService.getSession(conversationId);
+        const piSession = agentSession?.piSession;
+        const stats = piSession?.getSessionStats();
+        const contextUsage = piSession?.getContextUsage();
+
+        client.emit('agent:end', {
+          conversationId,
+          usage: stats
+            ? {
+                provider: agentSession?.provider ?? 'unknown',
+                modelId: agentSession?.modelId ?? 'unknown',
+                thinkingLevel: piSession?.thinkingLevel ?? 'off',
+                tokens: stats.tokens,
+                cost: stats.cost,
+                context: {
+                  percent: contextUsage?.percent ?? null,
+                  window: contextUsage?.contextWindow ?? 0,
+                },
+              }
+            : undefined,
+        });
         break;
+      }
 
       case 'message_update': {
         const assistantEvent = event.assistantMessageEvent;

apps/gateway/src/chat/chat.module.ts

@@ -1,9 +1,12 @@
-import { Module } from '@nestjs/common';
+import { forwardRef, Module } from '@nestjs/common';
+import { CommandsModule } from '../commands/commands.module.js';
 import { ChatGateway } from './chat.gateway.js';
 import { ChatController } from './chat.controller.js';
 
 @Module({
+  imports: [forwardRef(() => CommandsModule)],
   controllers: [ChatController],
   providers: [ChatGateway],
+  exports: [ChatGateway],
 })
 export class ChatModule {}

apps/gateway/src/commands/command-executor-p8012.spec.ts

@@ -0,0 +1,213 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { CommandExecutorService } from './command-executor.service.js';
+import type { SlashCommandPayload } from '@mosaic/types';
+
+// Minimal mock implementations
+const mockRegistry = {
+  getManifest: vi.fn(() => ({
+    version: 1,
+    commands: [
+      { name: 'provider', aliases: [], scope: 'agent', execution: 'hybrid', available: true },
+      { name: 'mission', aliases: [], scope: 'agent', execution: 'socket', available: true },
+      { name: 'agent', aliases: ['a'], scope: 'agent', execution: 'socket', available: true },
+      { name: 'prdy', aliases: [], scope: 'agent', execution: 'socket', available: true },
+      { name: 'tools', aliases: [], scope: 'agent', execution: 'socket', available: true },
+    ],
+    skills: [],
+  })),
+};
+
+const mockAgentService = {
+  getSession: vi.fn(() => undefined),
+};
+
+const mockSystemOverride = {
+  set: vi.fn(),
+  get: vi.fn(),
+  clear: vi.fn(),
+  renew: vi.fn(),
+};
+
+const mockSessionGC = {
+  sweepOrphans: vi.fn(() => ({ orphanedSessions: 0, totalCleaned: [], duration: 0 })),
+};
+
+const mockRedis = {
+  set: vi.fn().mockResolvedValue('OK'),
+  get: vi.fn(),
+  del: vi.fn(),
+};
+
+function buildService(): CommandExecutorService {
+  return new CommandExecutorService(
+    mockRegistry as never,
+    mockAgentService as never,
+    mockSystemOverride as never,
+    mockSessionGC as never,
+    mockRedis as never,
+    null,
+    null,
+  );
+}
+
+describe('CommandExecutorService — P8-012 commands', () => {
+  let service: CommandExecutorService;
+  const userId = 'user-123';
+  const conversationId = 'conv-456';
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    service = buildService();
+  });
+
+  // /provider login — missing provider name
+  it('/provider login with no provider name returns usage error', async () => {
+    const payload: SlashCommandPayload = { command: 'provider', args: 'login', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('Usage: /provider login');
+    expect(result.command).toBe('provider');
+  });
+
+  // /provider login anthropic — success with URL containing poll token
+  it('/provider login <name> returns success with URL and poll token', async () => {
+    const payload: SlashCommandPayload = {
+      command: 'provider',
+      args: 'login anthropic',
+      conversationId,
+    };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('provider');
+    expect(result.message).toContain('anthropic');
+    expect(result.message).toContain('http');
+    // data should contain loginUrl and pollToken
+    expect(result.data).toBeDefined();
+    const data = result.data as Record<string, unknown>;
+    expect(typeof data['loginUrl']).toBe('string');
+    expect(typeof data['pollToken']).toBe('string');
+    expect(data['loginUrl'] as string).toContain('anthropic');
+    expect(data['loginUrl'] as string).toContain(data['pollToken'] as string);
+    // Verify Valkey was called
+    expect(mockRedis.set).toHaveBeenCalledOnce();
+    const [key, value, , ttl] = mockRedis.set.mock.calls[0] as [string, string, string, number];
+    expect(key).toContain('mosaic:auth:poll:');
+    const stored = JSON.parse(value) as { status: string; provider: string; userId: string };
+    expect(stored.status).toBe('pending');
+    expect(stored.provider).toBe('anthropic');
+    expect(stored.userId).toBe(userId);
+    expect(ttl).toBe(300);
+  });
+
+  // /provider with no args — returns usage
+  it('/provider with no args returns usage message', async () => {
+    const payload: SlashCommandPayload = { command: 'provider', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('Usage: /provider');
+  });
+
+  // /provider list
+  it('/provider list returns success', async () => {
+    const payload: SlashCommandPayload = { command: 'provider', args: 'list', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('provider');
+  });
+
+  // /provider logout with no name — usage error
+  it('/provider logout with no name returns error', async () => {
+    const payload: SlashCommandPayload = { command: 'provider', args: 'logout', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('Usage: /provider logout');
+  });
+
+  // /provider unknown subcommand
+  it('/provider unknown subcommand returns error', async () => {
+    const payload: SlashCommandPayload = {
+      command: 'provider',
+      args: 'unknown',
+      conversationId,
+    };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('Unknown subcommand');
+  });
+
+  // /mission status
+  it('/mission status returns stub message', async () => {
+    const payload: SlashCommandPayload = { command: 'mission', args: 'status', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('mission');
+    expect(result.message).toContain('Mission status');
+  });
+
+  // /mission with no args
+  it('/mission with no args returns status stub', async () => {
+    const payload: SlashCommandPayload = { command: 'mission', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('Mission status');
+  });
+
+  // /mission set <id>
+  it('/mission set <id> returns confirmation', async () => {
+    const payload: SlashCommandPayload = {
+      command: 'mission',
+      args: 'set my-mission-123',
+      conversationId,
+    };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('my-mission-123');
+  });
+
+  // /agent list
+  it('/agent list returns stub message', async () => {
+    const payload: SlashCommandPayload = { command: 'agent', args: 'list', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('agent');
+    expect(result.message).toContain('agent');
+  });
+
+  // /agent with no args
+  it('/agent with no args returns usage', async () => {
+    const payload: SlashCommandPayload = { command: 'agent', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('Usage: /agent');
+  });
+
+  // /agent <id> — switch
+  it('/agent <id> returns switch confirmation', async () => {
+    const payload: SlashCommandPayload = {
+      command: 'agent',
+      args: 'my-agent-id',
+      conversationId,
+    };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('my-agent-id');
+  });
+
+  // /prdy
+  it('/prdy returns PRD wizard message', async () => {
+    const payload: SlashCommandPayload = { command: 'prdy', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('prdy');
+    expect(result.message).toContain('mosaic prdy');
+  });
+
+  // /tools
+  it('/tools returns tools stub message', async () => {
+    const payload: SlashCommandPayload = { command: 'tools', conversationId };
+    const result = await service.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('tools');
+    expect(result.message).toContain('tools');
+  });
+});

apps/gateway/src/commands/command-executor.service.ts

@@ -0,0 +1,373 @@
+import { forwardRef, Inject, Injectable, Logger, Optional } from '@nestjs/common';
+import type { QueueHandle } from '@mosaic/queue';
+import type { SlashCommandPayload, SlashCommandResultPayload } from '@mosaic/types';
+import { AgentService } from '../agent/agent.service.js';
+import { ChatGateway } from '../chat/chat.gateway.js';
+import { SessionGCService } from '../gc/session-gc.service.js';
+import { SystemOverrideService } from '../preferences/system-override.service.js';
+import { ReloadService } from '../reload/reload.service.js';
+import { COMMANDS_REDIS } from './commands.tokens.js';
+import { CommandRegistryService } from './command-registry.service.js';
+
+@Injectable()
+export class CommandExecutorService {
+  private readonly logger = new Logger(CommandExecutorService.name);
+
+  constructor(
+    @Inject(CommandRegistryService) private readonly registry: CommandRegistryService,
+    @Inject(AgentService) private readonly agentService: AgentService,
+    @Inject(SystemOverrideService) private readonly systemOverride: SystemOverrideService,
+    @Inject(SessionGCService) private readonly sessionGC: SessionGCService,
+    @Inject(COMMANDS_REDIS) private readonly redis: QueueHandle['redis'],
+    @Optional()
+    @Inject(forwardRef(() => ReloadService))
+    private readonly reloadService: ReloadService | null,
+    @Optional()
+    @Inject(forwardRef(() => ChatGateway))
+    private readonly chatGateway: ChatGateway | null,
+  ) {}
+
+  async execute(payload: SlashCommandPayload, userId: string): Promise<SlashCommandResultPayload> {
+    const { command, args, conversationId } = payload;
+
+    const def = this.registry.getManifest().commands.find((c) => c.name === command);
+    if (!def) {
+      return {
+        command,
+        conversationId,
+        success: false,
+        message: `Unknown command: /${command}`,
+      };
+    }
+
+    try {
+      switch (command) {
+        case 'model':
+          return await this.handleModel(args ?? null, conversationId);
+        case 'thinking':
+          return await this.handleThinking(args ?? null, conversationId);
+        case 'system':
+          return await this.handleSystem(args ?? null, conversationId);
+        case 'new':
+          return {
+            command,
+            conversationId,
+            success: true,
+            message: 'Start a new conversation by selecting New Conversation.',
+          };
+        case 'clear':
+          return {
+            command,
+            conversationId,
+            success: true,
+            message: 'Conversation display cleared.',
+          };
+        case 'compact':
+          return {
+            command,
+            conversationId,
+            success: true,
+            message: 'Context compaction requested.',
+          };
+        case 'retry':
+          return {
+            command,
+            conversationId,
+            success: true,
+            message: 'Retry last message requested.',
+          };
+        case 'gc': {
+          // User-scoped sweep for non-admin; system-wide for admin
+          const result = await this.sessionGC.sweepOrphans(userId);
+          return {
+            command: 'gc',
+            success: true,
+            message: `GC sweep complete: ${result.orphanedSessions} orphaned sessions cleaned in ${result.duration}ms.`,
+            conversationId,
+          };
+        }
+        case 'agent':
+          return await this.handleAgent(args ?? null, conversationId);
+        case 'provider':
+          return await this.handleProvider(args ?? null, userId, conversationId);
+        case 'mission':
+          return await this.handleMission(args ?? null, conversationId, userId);
+        case 'prdy':
+          return {
+            command: 'prdy',
+            success: true,
+            message:
+              'PRD wizard: run `mosaic prdy` in your project workspace to create or update a PRD.',
+            conversationId,
+          };
+        case 'tools':
+          return await this.handleTools(conversationId, userId);
+        case 'reload': {
+          if (!this.reloadService) {
+            return {
+              command: 'reload',
+              conversationId,
+              success: false,
+              message: 'ReloadService is not available.',
+            };
+          }
+          const reloadResult = await this.reloadService.reload('command');
+          this.chatGateway?.broadcastReload(reloadResult);
+          return {
+            command: 'reload',
+            success: true,
+            message: reloadResult.message,
+            conversationId,
+          };
+        }
+        default:
+          return {
+            command,
+            conversationId,
+            success: false,
+            message: `Command /${command} is not yet implemented.`,
+          };
+      }
+    } catch (err) {
+      this.logger.error(`Command /${command} failed: ${err}`);
+      return { command, conversationId, success: false, message: String(err) };
+    }
+  }
+
+  private async handleModel(
+    args: string | null,
+    conversationId: string,
+  ): Promise<SlashCommandResultPayload> {
+    if (!args) {
+      return {
+        command: 'model',
+        conversationId,
+        success: true,
+        message: 'Usage: /model <model-name>',
+      };
+    }
+    // Update agent session model if session is active
+    // For now, acknowledge the request — full wiring done in P8-012
+    const session = this.agentService.getSession(conversationId);
+    if (!session) {
+      return {
+        command: 'model',
+        conversationId,
+        success: true,
+        message: `Model switch to "${args}" requested. No active session for this conversation.`,
+      };
+    }
+    return {
+      command: 'model',
+      conversationId,
+      success: true,
+      message: `Model switch to "${args}" requested.`,
+    };
+  }
+
+  private async handleThinking(
+    args: string | null,
+    conversationId: string,
+  ): Promise<SlashCommandResultPayload> {
+    const level = args?.toLowerCase();
+    if (!level || !['none', 'low', 'medium', 'high', 'auto'].includes(level)) {
+      return {
+        command: 'thinking',
+        conversationId,
+        success: true,
+        message: 'Usage: /thinking <none|low|medium|high|auto>',
+      };
+    }
+    return {
+      command: 'thinking',
+      conversationId,
+      success: true,
+      message: `Thinking level set to "${level}".`,
+    };
+  }
+
+  private async handleSystem(
+    args: string | null,
+    conversationId: string,
+  ): Promise<SlashCommandResultPayload> {
+    if (!args || args.trim().length === 0) {
+      // Clear the override when called with no args
+      await this.systemOverride.clear(conversationId);
+      return {
+        command: 'system',
+        conversationId,
+        success: true,
+        message: 'Session system prompt override cleared.',
+      };
+    }
+
+    await this.systemOverride.set(conversationId, args.trim());
+    return {
+      command: 'system',
+      conversationId,
+      success: true,
+      message: `Session system prompt override set (expires in 5 minutes of inactivity).`,
+    };
+  }
+
+  private async handleAgent(
+    args: string | null,
+    conversationId: string,
+  ): Promise<SlashCommandResultPayload> {
+    if (!args) {
+      return {
+        command: 'agent',
+        success: true,
+        message: 'Usage: /agent <agent-id> to switch, or /agent list to see available agents.',
+        conversationId,
+      };
+    }
+
+    if (args === 'list') {
+      return {
+        command: 'agent',
+        success: true,
+        message: 'Agent listing: use the web dashboard for full agent management.',
+        conversationId,
+      };
+    }
+
+    // Switch agent — stub for now (full implementation in P8-015)
+    return {
+      command: 'agent',
+      success: true,
+      message: `Agent switch to "${args}" requested. Restart conversation to apply.`,
+      conversationId,
+    };
+  }
+
+  private async handleProvider(
+    args: string | null,
+    userId: string,
+    conversationId: string,
+  ): Promise<SlashCommandResultPayload> {
+    if (!args) {
+      return {
+        command: 'provider',
+        success: true,
+        message: 'Usage: /provider list | /provider login <name> | /provider logout <name>',
+        conversationId,
+      };
+    }
+
+    const spaceIdx = args.indexOf(' ');
+    const subcommand = spaceIdx >= 0 ? args.slice(0, spaceIdx) : args;
+    const providerName = spaceIdx >= 0 ? args.slice(spaceIdx + 1).trim() : '';
+
+    switch (subcommand) {
+      case 'list':
+        return {
+          command: 'provider',
+          success: true,
+          message: 'Use the web dashboard to manage providers.',
+          conversationId,
+        };
+
+      case 'login': {
+        if (!providerName) {
+          return {
+            command: 'provider',
+            success: false,
+            message: 'Usage: /provider login <provider-name>',
+            conversationId,
+          };
+        }
+        const pollToken = crypto.randomUUID();
+        const key = `mosaic:auth:poll:${pollToken}`;
+        // Store pending state in Valkey (TTL 5 minutes)
+        await this.redis.set(
+          key,
+          JSON.stringify({ status: 'pending', provider: providerName, userId }),
+          'EX',
+          300,
+        );
+        // In production this would construct an OAuth URL
+        const loginUrl = `${process.env['MOSAIC_BASE_URL'] ?? 'http://localhost:3000'}/auth/provider/${providerName}?token=${pollToken}`;
+        return {
+          command: 'provider',
+          success: true,
+          message: `Open this URL to authenticate with ${providerName}:\n${loginUrl}`,
+          conversationId,
+          data: { loginUrl, pollToken, provider: providerName },
+        };
+      }
+
+      case 'logout': {
+        if (!providerName) {
+          return {
+            command: 'provider',
+            success: false,
+            message: 'Usage: /provider logout <provider-name>',
+            conversationId,
+          };
+        }
+        return {
+          command: 'provider',
+          success: true,
+          message: `Logout from ${providerName}: use the web dashboard to revoke provider tokens.`,
+          conversationId,
+        };
+      }
+
+      default:
+        return {
+          command: 'provider',
+          success: false,
+          message: `Unknown subcommand: ${subcommand}. Use list, login, or logout.`,
+          conversationId,
+        };
+    }
+  }
+
+  private async handleMission(
+    args: string | null,
+    conversationId: string,
+    _userId: string,
+  ): Promise<SlashCommandResultPayload> {
+    if (!args || args === 'status') {
+      // TODO: fetch active mission from DB when MissionsService is available
+      return {
+        command: 'mission',
+        success: true,
+        message: 'Mission status: use the web dashboard for full mission management.',
+        conversationId,
+      };
+    }
+
+    if (args.startsWith('set ')) {
+      const missionId = args.slice(4).trim();
+      return {
+        command: 'mission',
+        success: true,
+        message: `Mission set to ${missionId}. Session context updated.`,
+        conversationId,
+      };
+    }
+
+    return {
+      command: 'mission',
+      success: true,
+      message: 'Usage: /mission [status|set <id>|list|tasks]',
+      conversationId,
+    };
+  }
+
+  private async handleTools(
+    conversationId: string,
+    _userId: string,
+  ): Promise<SlashCommandResultPayload> {
+    // TODO: fetch tool list from active agent session
+    return {
+      command: 'tools',
+      success: true,
+      message:
+        'Available tools depend on the active agent configuration. Use the web dashboard to configure tool access.',
+      conversationId,
+    };
+  }
+}

apps/gateway/src/commands/command-registry.service.spec.ts

@@ -0,0 +1,53 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { CommandRegistryService } from './command-registry.service.js';
+import type { CommandDef } from '@mosaic/types';
+
+const mockCmd: CommandDef = {
+  name: 'test',
+  description: 'Test command',
+  aliases: ['t'],
+  scope: 'core',
+  execution: 'local',
+  available: true,
+};
+
+describe('CommandRegistryService', () => {
+  let service: CommandRegistryService;
+
+  beforeEach(() => {
+    service = new CommandRegistryService();
+  });
+
+  it('starts with empty manifest', () => {
+    expect(service.getManifest().commands).toHaveLength(0);
+  });
+
+  it('registers a command', () => {
+    service.registerCommand(mockCmd);
+    expect(service.getManifest().commands).toHaveLength(1);
+  });
+
+  it('updates existing command by name', () => {
+    service.registerCommand(mockCmd);
+    service.registerCommand({ ...mockCmd, description: 'Updated' });
+    expect(service.getManifest().commands).toHaveLength(1);
+    expect(service.getManifest().commands[0]?.description).toBe('Updated');
+  });
+
+  it('onModuleInit registers core commands', () => {
+    service.onModuleInit();
+    const manifest = service.getManifest();
+    expect(manifest.commands.length).toBeGreaterThan(5);
+    expect(manifest.commands.some((c) => c.name === 'model')).toBe(true);
+    expect(manifest.commands.some((c) => c.name === 'help')).toBe(true);
+  });
+
+  it('manifest includes skills array', () => {
+    const manifest = service.getManifest();
+    expect(Array.isArray(manifest.skills)).toBe(true);
+  });
+
+  it('manifest version is 1', () => {
+    expect(service.getManifest().version).toBe(1);
+  });
+});

apps/gateway/src/commands/command-registry.service.ts

@@ -0,0 +1,273 @@
+import { Injectable, type OnModuleInit } from '@nestjs/common';
+import type { CommandDef, CommandManifest } from '@mosaic/types';
+
+@Injectable()
+export class CommandRegistryService implements OnModuleInit {
+  private readonly commands: CommandDef[] = [];
+
+  registerCommand(def: CommandDef): void {
+    const existing = this.commands.findIndex((c) => c.name === def.name);
+    if (existing >= 0) {
+      this.commands[existing] = def;
+    } else {
+      this.commands.push(def);
+    }
+  }
+
+  registerCommands(defs: CommandDef[]): void {
+    for (const def of defs) {
+      this.registerCommand(def);
+    }
+  }
+
+  getManifest(): CommandManifest {
+    return {
+      version: 1,
+      commands: [...this.commands],
+      skills: [],
+    };
+  }
+
+  onModuleInit(): void {
+    this.registerCommands([
+      {
+        name: 'model',
+        description: 'Switch the active model',
+        aliases: ['m'],
+        args: [
+          {
+            name: 'model-name',
+            type: 'string',
+            optional: false,
+            description: 'Model name to switch to',
+          },
+        ],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'thinking',
+        description: 'Set thinking level (none/low/medium/high/auto)',
+        aliases: ['t'],
+        args: [
+          {
+            name: 'level',
+            type: 'enum',
+            optional: false,
+            values: ['none', 'low', 'medium', 'high', 'auto'],
+            description: 'Thinking level',
+          },
+        ],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'new',
+        description: 'Start a new conversation',
+        aliases: ['n'],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'clear',
+        description: 'Clear conversation context and GC session artifacts',
+        aliases: [],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'compact',
+        description: 'Request context compaction',
+        aliases: [],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'retry',
+        description: 'Retry the last message',
+        aliases: [],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'rename',
+        description: 'Rename current conversation',
+        aliases: [],
+        args: [
+          { name: 'name', type: 'string', optional: false, description: 'New conversation name' },
+        ],
+        scope: 'core',
+        execution: 'rest',
+        available: true,
+      },
+      {
+        name: 'history',
+        description: 'Show conversation history',
+        aliases: [],
+        args: [
+          {
+            name: 'limit',
+            type: 'string',
+            optional: true,
+            description: 'Number of messages to show',
+          },
+        ],
+        scope: 'core',
+        execution: 'rest',
+        available: true,
+      },
+      {
+        name: 'export',
+        description: 'Export conversation to markdown or JSON',
+        aliases: [],
+        args: [
+          {
+            name: 'format',
+            type: 'enum',
+            optional: true,
+            values: ['md', 'json'],
+            description: 'Export format',
+          },
+        ],
+        scope: 'core',
+        execution: 'rest',
+        available: true,
+      },
+      {
+        name: 'preferences',
+        description: 'View or set user preferences',
+        aliases: ['pref'],
+        args: [
+          {
+            name: 'action',
+            type: 'enum',
+            optional: true,
+            values: ['show', 'set', 'reset'],
+            description: 'Action to perform',
+          },
+        ],
+        scope: 'core',
+        execution: 'rest',
+        available: true,
+      },
+      {
+        name: 'system',
+        description: 'Set session-scoped system prompt override',
+        aliases: [],
+        args: [
+          {
+            name: 'override',
+            type: 'string',
+            optional: false,
+            description: 'System prompt text to inject for this session',
+          },
+        ],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'status',
+        description: 'Show session and connection status',
+        aliases: ['s'],
+        scope: 'core',
+        execution: 'hybrid',
+        available: true,
+      },
+      {
+        name: 'help',
+        description: 'Show available commands',
+        aliases: ['h'],
+        scope: 'core',
+        execution: 'local',
+        available: true,
+      },
+      {
+        name: 'gc',
+        description: 'Trigger garbage collection sweep (user-scoped)',
+        aliases: [],
+        scope: 'core',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'agent',
+        description: 'Switch or list available agents',
+        aliases: ['a'],
+        args: [
+          {
+            name: 'args',
+            type: 'string',
+            optional: true,
+            description: 'list or <agent-id>',
+          },
+        ],
+        scope: 'agent',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'provider',
+        description: 'Manage LLM providers (list/login/logout)',
+        aliases: [],
+        args: [
+          {
+            name: 'args',
+            type: 'string',
+            optional: true,
+            description: 'list | login <name> | logout <name>',
+          },
+        ],
+        scope: 'agent',
+        execution: 'hybrid',
+        available: true,
+      },
+      {
+        name: 'mission',
+        description: 'View or set active mission',
+        aliases: [],
+        args: [
+          {
+            name: 'args',
+            type: 'string',
+            optional: true,
+            description: 'status | set <id> | list | tasks',
+          },
+        ],
+        scope: 'agent',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'prdy',
+        description: 'Launch PRD wizard',
+        aliases: [],
+        scope: 'agent',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'tools',
+        description: 'List available agent tools',
+        aliases: [],
+        scope: 'agent',
+        execution: 'socket',
+        available: true,
+      },
+      {
+        name: 'reload',
+        description: 'Soft-reload gateway plugins and command manifest (admin)',
+        aliases: [],
+        scope: 'admin',
+        execution: 'socket',
+        available: true,
+      },
+    ]);
+  }
+}

apps/gateway/src/commands/commands.integration.spec.ts

@@ -0,0 +1,253 @@
+/**
+ * Integration tests for the gateway command system (P8-019)
+ *
+ * Covers:
+ * - CommandRegistryService.getManifest() returns 12+ core commands
+ * - All core commands have correct execution types
+ * - Alias resolution works for all defined aliases
+ * - CommandExecutorService routes known/unknown commands correctly
+ * - /gc handler calls SessionGCService.sweepOrphans
+ * - /system handler calls SystemOverrideService.set
+ * - Unknown command returns descriptive error
+ */
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { CommandRegistryService } from './command-registry.service.js';
+import { CommandExecutorService } from './command-executor.service.js';
+import type { SlashCommandPayload } from '@mosaic/types';
+
+// ─── Mocks ───────────────────────────────────────────────────────────────────
+
+const mockAgentService = {
+  getSession: vi.fn(() => undefined),
+};
+
+const mockSystemOverride = {
+  set: vi.fn().mockResolvedValue(undefined),
+  get: vi.fn().mockResolvedValue(null),
+  clear: vi.fn().mockResolvedValue(undefined),
+  renew: vi.fn().mockResolvedValue(undefined),
+};
+
+const mockSessionGC = {
+  sweepOrphans: vi.fn().mockResolvedValue({ orphanedSessions: 3, totalCleaned: [], duration: 12 }),
+};
+
+const mockRedis = {
+  set: vi.fn().mockResolvedValue('OK'),
+  get: vi.fn().mockResolvedValue(null),
+  del: vi.fn().mockResolvedValue(0),
+  keys: vi.fn().mockResolvedValue([]),
+};
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function buildRegistry(): CommandRegistryService {
+  const svc = new CommandRegistryService();
+  svc.onModuleInit(); // seed core commands
+  return svc;
+}
+
+function buildExecutor(registry: CommandRegistryService): CommandExecutorService {
+  return new CommandExecutorService(
+    registry as never,
+    mockAgentService as never,
+    mockSystemOverride as never,
+    mockSessionGC as never,
+    mockRedis as never,
+    null, // reloadService (optional)
+    null, // chatGateway (optional)
+  );
+}
+
+// ─── Registry Tests ───────────────────────────────────────────────────────────
+
+describe('CommandRegistryService — integration', () => {
+  let registry: CommandRegistryService;
+
+  beforeEach(() => {
+    registry = buildRegistry();
+  });
+
+  it('getManifest() returns 12 or more core commands after onModuleInit', () => {
+    const manifest = registry.getManifest();
+    expect(manifest.commands.length).toBeGreaterThanOrEqual(12);
+  });
+
+  it('manifest version is 1', () => {
+    expect(registry.getManifest().version).toBe(1);
+  });
+
+  it('manifest.skills is an array', () => {
+    expect(Array.isArray(registry.getManifest().skills)).toBe(true);
+  });
+
+  it('all commands have required fields: name, description, execution, scope, available', () => {
+    for (const cmd of registry.getManifest().commands) {
+      expect(typeof cmd.name).toBe('string');
+      expect(typeof cmd.description).toBe('string');
+      expect(['local', 'socket', 'rest', 'hybrid']).toContain(cmd.execution);
+      expect(['core', 'agent', 'admin']).toContain(cmd.scope);
+      expect(typeof cmd.available).toBe('boolean');
+    }
+  });
+
+  // Execution type verification for core commands
+  const expectedExecutionTypes: Record<string, string> = {
+    model: 'socket',
+    thinking: 'socket',
+    new: 'socket',
+    clear: 'socket',
+    compact: 'socket',
+    retry: 'socket',
+    rename: 'rest',
+    history: 'rest',
+    export: 'rest',
+    preferences: 'rest',
+    system: 'socket',
+    help: 'local',
+    gc: 'socket',
+    agent: 'socket',
+    provider: 'hybrid',
+    mission: 'socket',
+    prdy: 'socket',
+    tools: 'socket',
+    reload: 'socket',
+  };
+
+  for (const [name, expectedExecution] of Object.entries(expectedExecutionTypes)) {
+    it(`command "${name}" has execution type "${expectedExecution}"`, () => {
+      const cmd = registry.getManifest().commands.find((c) => c.name === name);
+      expect(cmd, `command "${name}" not found`).toBeDefined();
+      expect(cmd!.execution).toBe(expectedExecution);
+    });
+  }
+
+  // Alias resolution checks
+  const expectedAliases: Array<[string, string]> = [
+    ['m', 'model'],
+    ['t', 'thinking'],
+    ['n', 'new'],
+    ['a', 'agent'],
+    ['s', 'status'],
+    ['h', 'help'],
+    ['pref', 'preferences'],
+  ];
+
+  for (const [alias, commandName] of expectedAliases) {
+    it(`alias "/${alias}" resolves to command "${commandName}" via aliases array`, () => {
+      const cmd = registry
+        .getManifest()
+        .commands.find((c) => c.name === commandName || c.aliases?.includes(alias));
+      expect(cmd, `command with alias "${alias}" not found`).toBeDefined();
+    });
+  }
+});
+
+// ─── Executor Tests ───────────────────────────────────────────────────────────
+
+describe('CommandExecutorService — integration', () => {
+  let registry: CommandRegistryService;
+  let executor: CommandExecutorService;
+  const userId = 'user-integ-001';
+  const conversationId = 'conv-integ-001';
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    registry = buildRegistry();
+    executor = buildExecutor(registry);
+  });
+
+  // Unknown command returns error
+  it('unknown command returns success:false with descriptive message', async () => {
+    const payload: SlashCommandPayload = { command: 'nonexistent', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('nonexistent');
+    expect(result.command).toBe('nonexistent');
+  });
+
+  // /gc handler calls SessionGCService.sweepOrphans
+  it('/gc calls SessionGCService.sweepOrphans with userId', async () => {
+    const payload: SlashCommandPayload = { command: 'gc', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(mockSessionGC.sweepOrphans).toHaveBeenCalledWith(userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('GC sweep complete');
+    expect(result.message).toContain('3 orphaned sessions');
+  });
+
+  // /system with args calls SystemOverrideService.set
+  it('/system with text calls SystemOverrideService.set', async () => {
+    const override = 'You are a helpful assistant.';
+    const payload: SlashCommandPayload = { command: 'system', args: override, conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(mockSystemOverride.set).toHaveBeenCalledWith(conversationId, override);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('override set');
+  });
+
+  // /system with no args clears the override
+  it('/system with no args calls SystemOverrideService.clear', async () => {
+    const payload: SlashCommandPayload = { command: 'system', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(mockSystemOverride.clear).toHaveBeenCalledWith(conversationId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('cleared');
+  });
+
+  // /model with model name returns success
+  it('/model with a model name returns success', async () => {
+    const payload: SlashCommandPayload = {
+      command: 'model',
+      args: 'claude-3-opus',
+      conversationId,
+    };
+    const result = await executor.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('model');
+    expect(result.message).toContain('claude-3-opus');
+  });
+
+  // /thinking with valid level returns success
+  it('/thinking with valid level returns success', async () => {
+    const payload: SlashCommandPayload = { command: 'thinking', args: 'high', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('high');
+  });
+
+  // /thinking with invalid level returns usage message
+  it('/thinking with invalid level returns usage message', async () => {
+    const payload: SlashCommandPayload = { command: 'thinking', args: 'invalid', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('Usage:');
+  });
+
+  // /new command returns success
+  it('/new returns success', async () => {
+    const payload: SlashCommandPayload = { command: 'new', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(result.success).toBe(true);
+    expect(result.command).toBe('new');
+  });
+
+  // /reload without reloadService returns failure
+  it('/reload without ReloadService returns failure', async () => {
+    const payload: SlashCommandPayload = { command: 'reload', conversationId };
+    const result = await executor.execute(payload, userId);
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('ReloadService');
+  });
+
+  // Commands not yet fully implemented return a fallback response
+  const stubCommands = ['clear', 'compact', 'retry'];
+  for (const cmd of stubCommands) {
+    it(`/${cmd} returns success (stub)`, async () => {
+      const payload: SlashCommandPayload = { command: cmd, conversationId };
+      const result = await executor.execute(payload, userId);
+      expect(result.success).toBe(true);
+      expect(result.command).toBe(cmd);
+    });
+  }
+});

apps/gateway/src/commands/commands.module.ts

@@ -0,0 +1,37 @@
+import { forwardRef, Inject, Module, type OnApplicationShutdown } from '@nestjs/common';
+import { createQueue, type QueueHandle } from '@mosaic/queue';
+import { ChatModule } from '../chat/chat.module.js';
+import { GCModule } from '../gc/gc.module.js';
+import { ReloadModule } from '../reload/reload.module.js';
+import { CommandExecutorService } from './command-executor.service.js';
+import { CommandRegistryService } from './command-registry.service.js';
+import { COMMANDS_REDIS } from './commands.tokens.js';
+
+const COMMANDS_QUEUE_HANDLE = 'COMMANDS_QUEUE_HANDLE';
+
+@Module({
+  imports: [GCModule, forwardRef(() => ReloadModule), forwardRef(() => ChatModule)],
+  providers: [
+    {
+      provide: COMMANDS_QUEUE_HANDLE,
+      useFactory: (): QueueHandle => {
+        return createQueue();
+      },
+    },
+    {
+      provide: COMMANDS_REDIS,
+      useFactory: (handle: QueueHandle) => handle.redis,
+      inject: [COMMANDS_QUEUE_HANDLE],
+    },
+    CommandRegistryService,
+    CommandExecutorService,
+  ],
+  exports: [CommandRegistryService, CommandExecutorService],
+})
+export class CommandsModule implements OnApplicationShutdown {
+  constructor(@Inject(COMMANDS_QUEUE_HANDLE) private readonly handle: QueueHandle) {}
+
+  async onApplicationShutdown(): Promise<void> {
+    await this.handle.close().catch(() => {});
+  }
+}

apps/gateway/src/commands/commands.tokens.ts

@@ -0,0 +1 @@
+export const COMMANDS_REDIS = 'COMMANDS_REDIS';

apps/gateway/src/conversations/conversations.controller.ts

@@ -16,7 +16,8 @@ import type { Brain } from '@mosaic/brain';
 import { BRAIN } from '../brain/brain.tokens.js';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { CurrentUser } from '../auth/current-user.decorator.js';
-import type {
+import { assertOwner } from '../auth/resource-ownership.js';
+import {
   CreateConversationDto,
   UpdateConversationDto,
   SendMessageDto,
@@ -33,10 +34,8 @@ export class ConversationsController {
   }
 
   @Get(':id')
-  async findOne(@Param('id') id: string) {
-    const conversation = await this.brain.conversations.findById(id);
-    if (!conversation) throw new NotFoundException('Conversation not found');
-    return conversation;
+  async findOne(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    return this.getOwnedConversation(id, user.id);
   }
 
   @Post()
@@ -49,7 +48,12 @@ export class ConversationsController {
   }
 
   @Patch(':id')
-  async update(@Param('id') id: string, @Body() dto: UpdateConversationDto) {
+  async update(
+    @Param('id') id: string,
+    @Body() dto: UpdateConversationDto,
+    @CurrentUser() user: { id: string },
+  ) {
+    await this.getOwnedConversation(id, user.id);
     const conversation = await this.brain.conversations.update(id, dto);
     if (!conversation) throw new NotFoundException('Conversation not found');
     return conversation;
@@ -57,22 +61,25 @@ export class ConversationsController {
 
   @Delete(':id')
   @HttpCode(HttpStatus.NO_CONTENT)
-  async remove(@Param('id') id: string) {
+  async remove(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    await this.getOwnedConversation(id, user.id);
     const deleted = await this.brain.conversations.remove(id);
     if (!deleted) throw new NotFoundException('Conversation not found');
   }
 
   @Get(':id/messages')
-  async listMessages(@Param('id') id: string) {
-    const conversation = await this.brain.conversations.findById(id);
-    if (!conversation) throw new NotFoundException('Conversation not found');
+  async listMessages(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    await this.getOwnedConversation(id, user.id);
     return this.brain.conversations.findMessages(id);
   }
 
   @Post(':id/messages')
-  async addMessage(@Param('id') id: string, @Body() dto: SendMessageDto) {
-    const conversation = await this.brain.conversations.findById(id);
-    if (!conversation) throw new NotFoundException('Conversation not found');
+  async addMessage(
+    @Param('id') id: string,
+    @Body() dto: SendMessageDto,
+    @CurrentUser() user: { id: string },
+  ) {
+    await this.getOwnedConversation(id, user.id);
     return this.brain.conversations.addMessage({
       conversationId: id,
       role: dto.role,
@@ -80,4 +87,11 @@ export class ConversationsController {
       metadata: dto.metadata,
     });
   }
+
+  private async getOwnedConversation(id: string, userId: string) {
+    const conversation = await this.brain.conversations.findById(id);
+    if (!conversation) throw new NotFoundException('Conversation not found');
+    assertOwner(conversation.userId, userId, 'Conversation');
+    return conversation;
+  }
 }

apps/gateway/src/conversations/conversations.dto.ts

@@ -1,15 +1,48 @@
-export interface CreateConversationDto {
+import {
+  IsBoolean,
+  IsIn,
+  IsObject,
+  IsOptional,
+  IsString,
+  IsUUID,
+  MaxLength,
+} from 'class-validator';
+
+export class CreateConversationDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
   title?: string;
+
+  @IsOptional()
+  @IsUUID()
   projectId?: string;
 }
 
-export interface UpdateConversationDto {
+export class UpdateConversationDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
   title?: string;
+
+  @IsOptional()
+  @IsUUID()
   projectId?: string | null;
+
+  @IsOptional()
+  @IsBoolean()
+  archived?: boolean;
 }
 
-export interface SendMessageDto {
-  role: 'user' | 'assistant' | 'system';
-  content: string;
+export class SendMessageDto {
+  @IsIn(['user', 'assistant', 'system'])
+  role!: 'user' | 'assistant' | 'system';
+
+  @IsString()
+  @MaxLength(10_000)
+  content!: string;
+
+  @IsOptional()
+  @IsObject()
   metadata?: Record<string, unknown>;
 }

apps/gateway/src/coord/coord.controller.ts

@@ -44,6 +44,10 @@ function resolveAndValidatePath(raw: string | undefined): string {
   return resolved;
 }
 
+/**
+ * File-based coord endpoints for agent tool consumption.
+ * DB-backed mission CRUD has moved to MissionsController at /api/missions.
+ */
 @Controller('api/coord')
 @UseGuards(AuthGuard)
 export class CoordController {

apps/gateway/src/coord/coord.dto.ts

@@ -1,3 +1,5 @@
+// ── File-based coord DTOs (legacy file-system backed) ──
+
 export interface CoordMissionStatusDto {
   mission: {
     id: string;
@@ -47,3 +49,42 @@ export interface CoordTaskDetailDto {
     startedAt: string;
   };
 }
+
+// ── DB-backed coord DTOs ──
+
+export interface CreateDbMissionDto {
+  name: string;
+  description?: string;
+  projectId?: string;
+  phase?: string;
+  milestones?: Record<string, unknown>[];
+  config?: Record<string, unknown>;
+  status?: 'planning' | 'active' | 'paused' | 'completed' | 'failed';
+}
+
+export interface UpdateDbMissionDto {
+  name?: string;
+  description?: string;
+  projectId?: string;
+  phase?: string;
+  milestones?: Record<string, unknown>[];
+  config?: Record<string, unknown>;
+  status?: 'planning' | 'active' | 'paused' | 'completed' | 'failed';
+}
+
+export interface CreateMissionTaskDto {
+  missionId: string;
+  taskId?: string;
+  status?: 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';
+  description?: string;
+  notes?: string;
+  pr?: string;
+}
+
+export interface UpdateMissionTaskDto {
+  taskId?: string;
+  status?: 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';
+  description?: string;
+  notes?: string;
+  pr?: string;
+}

apps/gateway/src/coord/coord.service.ts

@@ -12,6 +12,10 @@ import {
 import { promises as fs } from 'node:fs';
 import path from 'node:path';
 
+/**
+ * File-based coord operations for agent tool consumption.
+ * DB-backed mission CRUD is handled directly by MissionsController via Brain repos.
+ */
 @Injectable()
 export class CoordService {
   private readonly logger = new Logger(CoordService.name);

apps/gateway/src/gc/gc.module.ts

@@ -0,0 +1,31 @@
+import { Module, type OnApplicationShutdown, Inject } from '@nestjs/common';
+import { createQueue, type QueueHandle } from '@mosaic/queue';
+import { SessionGCService } from './session-gc.service.js';
+import { REDIS } from './gc.tokens.js';
+
+const GC_QUEUE_HANDLE = 'GC_QUEUE_HANDLE';
+
+@Module({
+  providers: [
+    {
+      provide: GC_QUEUE_HANDLE,
+      useFactory: (): QueueHandle => {
+        return createQueue();
+      },
+    },
+    {
+      provide: REDIS,
+      useFactory: (handle: QueueHandle) => handle.redis,
+      inject: [GC_QUEUE_HANDLE],
+    },
+    SessionGCService,
+  ],
+  exports: [SessionGCService],
+})
+export class GCModule implements OnApplicationShutdown {
+  constructor(@Inject(GC_QUEUE_HANDLE) private readonly handle: QueueHandle) {}
+
+  async onApplicationShutdown(): Promise<void> {
+    await this.handle.close().catch(() => {});
+  }
+}

apps/gateway/src/gc/gc.tokens.ts

@@ -0,0 +1 @@
+export const REDIS = 'REDIS';

apps/gateway/src/gc/session-gc.service.spec.ts

@@ -0,0 +1,97 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { Logger } from '@nestjs/common';
+import type { QueueHandle } from '@mosaic/queue';
+import type { LogService } from '@mosaic/log';
+import { SessionGCService } from './session-gc.service.js';
+
+type MockRedis = {
+  keys: ReturnType<typeof vi.fn>;
+  del: ReturnType<typeof vi.fn>;
+};
+
+describe('SessionGCService', () => {
+  let service: SessionGCService;
+  let mockRedis: MockRedis;
+  let mockLogService: { logs: { promoteToWarm: ReturnType<typeof vi.fn> } };
+
+  beforeEach(() => {
+    mockRedis = {
+      keys: vi.fn().mockResolvedValue([]),
+      del: vi.fn().mockResolvedValue(0),
+    };
+
+    mockLogService = {
+      logs: {
+        promoteToWarm: vi.fn().mockResolvedValue(0),
+      },
+    };
+
+    // Suppress logger output in tests
+    vi.spyOn(Logger.prototype, 'log').mockImplementation(() => {});
+
+    service = new SessionGCService(
+      mockRedis as unknown as QueueHandle['redis'],
+      mockLogService as unknown as LogService,
+    );
+  });
+
+  it('collect() deletes Valkey keys for session', async () => {
+    mockRedis.keys.mockResolvedValue(['mosaic:session:abc:system', 'mosaic:session:abc:foo']);
+    const result = await service.collect('abc');
+    expect(mockRedis.del).toHaveBeenCalledWith(
+      'mosaic:session:abc:system',
+      'mosaic:session:abc:foo',
+    );
+    expect(result.cleaned.valkeyKeys).toBe(2);
+  });
+
+  it('collect() with no keys returns empty cleaned valkeyKeys', async () => {
+    mockRedis.keys.mockResolvedValue([]);
+    const result = await service.collect('abc');
+    expect(result.cleaned.valkeyKeys).toBeUndefined();
+  });
+
+  it('collect() returns sessionId in result', async () => {
+    const result = await service.collect('test-session-id');
+    expect(result.sessionId).toBe('test-session-id');
+  });
+
+  it('fullCollect() deletes all session keys', async () => {
+    mockRedis.keys.mockResolvedValue(['mosaic:session:abc:system', 'mosaic:session:xyz:foo']);
+    const result = await service.fullCollect();
+    expect(mockRedis.del).toHaveBeenCalled();
+    expect(result.valkeyKeys).toBe(2);
+  });
+
+  it('fullCollect() with no keys returns 0 valkeyKeys', async () => {
+    mockRedis.keys.mockResolvedValue([]);
+    const result = await service.fullCollect();
+    expect(result.valkeyKeys).toBe(0);
+    expect(mockRedis.del).not.toHaveBeenCalled();
+  });
+
+  it('fullCollect() returns duration', async () => {
+    const result = await service.fullCollect();
+    expect(result.duration).toBeGreaterThanOrEqual(0);
+  });
+
+  it('sweepOrphans() extracts unique session IDs and collects them', async () => {
+    mockRedis.keys.mockResolvedValue([
+      'mosaic:session:abc:system',
+      'mosaic:session:abc:messages',
+      'mosaic:session:xyz:system',
+    ]);
+    mockRedis.del.mockResolvedValue(1);
+
+    const result = await service.sweepOrphans();
+    expect(result.orphanedSessions).toBeGreaterThanOrEqual(0);
+    expect(result.duration).toBeGreaterThanOrEqual(0);
+  });
+
+  it('sweepOrphans() returns empty when no session keys', async () => {
+    mockRedis.keys.mockResolvedValue([]);
+    const result = await service.sweepOrphans();
+    expect(result.orphanedSessions).toBe(0);
+    expect(result.totalCleaned).toHaveLength(0);
+  });
+});

apps/gateway/src/gc/session-gc.service.ts

@@ -0,0 +1,139 @@
+import { Inject, Injectable, Logger, type OnModuleInit } from '@nestjs/common';
+import type { QueueHandle } from '@mosaic/queue';
+import type { LogService } from '@mosaic/log';
+import { LOG_SERVICE } from '../log/log.tokens.js';
+import { REDIS } from './gc.tokens.js';
+
+export interface GCResult {
+  sessionId: string;
+  cleaned: {
+    valkeyKeys?: number;
+    logsDemoted?: number;
+    tempFilesRemoved?: number;
+  };
+}
+
+export interface GCSweepResult {
+  orphanedSessions: number;
+  totalCleaned: GCResult[];
+  duration: number;
+}
+
+export interface FullGCResult {
+  valkeyKeys: number;
+  logsDemoted: number;
+  jobsPurged: number;
+  tempFilesRemoved: number;
+  duration: number;
+}
+
+@Injectable()
+export class SessionGCService implements OnModuleInit {
+  private readonly logger = new Logger(SessionGCService.name);
+
+  constructor(
+    @Inject(REDIS) private readonly redis: QueueHandle['redis'],
+    @Inject(LOG_SERVICE) private readonly logService: LogService,
+  ) {}
+
+  async onModuleInit(): Promise<void> {
+    this.logger.log('Running full GC on cold start...');
+    const result = await this.fullCollect();
+    this.logger.log(
+      `Full GC complete: ${result.valkeyKeys} Valkey keys, ` +
+        `${result.logsDemoted} logs demoted, ` +
+        `${result.jobsPurged} jobs purged, ` +
+        `${result.tempFilesRemoved} temp dirs removed ` +
+        `(${result.duration}ms)`,
+    );
+  }
+
+  /**
+   * Immediate cleanup for a single session (call from destroySession).
+   */
+  async collect(sessionId: string): Promise<GCResult> {
+    const result: GCResult = { sessionId, cleaned: {} };
+
+    // 1. Valkey: delete all session-scoped keys
+    const pattern = `mosaic:session:${sessionId}:*`;
+    const valkeyKeys = await this.redis.keys(pattern);
+    if (valkeyKeys.length > 0) {
+      await this.redis.del(...valkeyKeys);
+      result.cleaned.valkeyKeys = valkeyKeys.length;
+    }
+
+    // 2. PG: demote hot-tier agent_logs for this session to warm
+    const cutoff = new Date(); // demote all hot logs for this session
+    const logsDemoted = await this.logService.logs.promoteToWarm(cutoff);
+    if (logsDemoted > 0) {
+      result.cleaned.logsDemoted = logsDemoted;
+    }
+
+    return result;
+  }
+
+  /**
+   * Sweep GC — find orphaned artifacts from dead sessions.
+   * User-scoped when userId provided; system-wide when null (admin).
+   */
+  async sweepOrphans(_userId?: string): Promise<GCSweepResult> {
+    const start = Date.now();
+    const cleaned: GCResult[] = [];
+
+    // 1. Find all session-scoped Valkey keys
+    const allSessionKeys = await this.redis.keys('mosaic:session:*');
+
+    // Extract unique session IDs from keys
+    const sessionIds = new Set<string>();
+    for (const key of allSessionKeys) {
+      const match = key.match(/^mosaic:session:([^:]+):/);
+      if (match) sessionIds.add(match[1]!);
+    }
+
+    // 2. For each session ID, collect stale keys
+    for (const sessionId of sessionIds) {
+      const gcResult = await this.collect(sessionId);
+      if (Object.keys(gcResult.cleaned).length > 0) {
+        cleaned.push(gcResult);
+      }
+    }
+
+    return {
+      orphanedSessions: cleaned.length,
+      totalCleaned: cleaned,
+      duration: Date.now() - start,
+    };
+  }
+
+  /**
+   * Full GC — aggressive collection for cold start.
+   * Assumes no sessions survived the restart.
+   */
+  async fullCollect(): Promise<FullGCResult> {
+    const start = Date.now();
+
+    // 1. Valkey: delete ALL session-scoped keys
+    const sessionKeys = await this.redis.keys('mosaic:session:*');
+    if (sessionKeys.length > 0) {
+      await this.redis.del(...sessionKeys);
+    }
+
+    // 2. NOTE: channel keys are NOT collected on cold start
+    //    (discord/telegram plugins may reconnect and resume)
+
+    // 3. PG: demote stale hot-tier logs older than 24h to warm
+    const hotCutoff = new Date(Date.now() - 24 * 60 * 60 * 1000);
+    const logsDemoted = await this.logService.logs.promoteToWarm(hotCutoff);
+
+    // 4. No summarization job purge API available yet
+    const jobsPurged = 0;
+
+    return {
+      valkeyKeys: sessionKeys.length,
+      logsDemoted,
+      jobsPurged,
+      tempFilesRemoved: 0,
+      duration: Date.now() - start,
+    };
+  }
+}

apps/gateway/src/log/cron.service.ts

@@ -0,0 +1,63 @@
+import {
+  Inject,
+  Injectable,
+  Logger,
+  type OnModuleInit,
+  type OnModuleDestroy,
+} from '@nestjs/common';
+import cron from 'node-cron';
+import { SummarizationService } from './summarization.service.js';
+import { SessionGCService } from '../gc/session-gc.service.js';
+
+@Injectable()
+export class CronService implements OnModuleInit, OnModuleDestroy {
+  private readonly logger = new Logger(CronService.name);
+  private readonly tasks: cron.ScheduledTask[] = [];
+
+  constructor(
+    @Inject(SummarizationService) private readonly summarization: SummarizationService,
+    @Inject(SessionGCService) private readonly sessionGC: SessionGCService,
+  ) {}
+
+  onModuleInit(): void {
+    const summarizationSchedule = process.env['SUMMARIZATION_CRON'] ?? '0 */6 * * *'; // every 6 hours
+    const tierManagementSchedule = process.env['TIER_MANAGEMENT_CRON'] ?? '0 3 * * *'; // daily at 3am
+    const gcSchedule = process.env['SESSION_GC_CRON'] ?? '0 4 * * *'; // daily at 4am
+
+    this.tasks.push(
+      cron.schedule(summarizationSchedule, () => {
+        this.summarization.runSummarization().catch((err) => {
+          this.logger.error(`Scheduled summarization failed: ${err}`);
+        });
+      }),
+    );
+
+    this.tasks.push(
+      cron.schedule(tierManagementSchedule, () => {
+        this.summarization.runTierManagement().catch((err) => {
+          this.logger.error(`Scheduled tier management failed: ${err}`);
+        });
+      }),
+    );
+
+    this.tasks.push(
+      cron.schedule(gcSchedule, () => {
+        this.sessionGC.sweepOrphans().catch((err) => {
+          this.logger.error(`Session GC sweep failed: ${err}`);
+        });
+      }),
+    );
+
+    this.logger.log(
+      `Cron scheduled: summarization="${summarizationSchedule}", tier="${tierManagementSchedule}", gc="${gcSchedule}"`,
+    );
+  }
+
+  onModuleDestroy(): void {
+    for (const task of this.tasks) {
+      task.stop();
+    }
+    this.tasks.length = 0;
+    this.logger.log('Cron tasks stopped');
+  }
+}

apps/gateway/src/log/log.controller.ts

@@ -0,0 +1,62 @@
+import { Body, Controller, Get, Inject, Param, Post, Query, UseGuards } from '@nestjs/common';
+import type { LogService } from '@mosaic/log';
+import { LOG_SERVICE } from './log.tokens.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import type { IngestLogDto, QueryLogsDto } from './log.dto.js';
+
+@Controller('api/logs')
+@UseGuards(AuthGuard)
+export class LogController {
+  constructor(@Inject(LOG_SERVICE) private readonly logService: LogService) {}
+
+  @Post()
+  async ingest(@Query('userId') userId: string, @Body() dto: IngestLogDto) {
+    return this.logService.logs.ingest({
+      sessionId: dto.sessionId,
+      userId,
+      level: dto.level,
+      category: dto.category,
+      content: dto.content,
+      metadata: dto.metadata,
+    });
+  }
+
+  @Post('batch')
+  async ingestBatch(@Query('userId') userId: string, @Body() dtos: IngestLogDto[]) {
+    const entries = dtos.map((dto) => ({
+      sessionId: dto.sessionId,
+      userId,
+      level: dto.level as 'debug' | 'info' | 'warn' | 'error' | undefined,
+      category: dto.category as
+        | 'decision'
+        | 'tool_use'
+        | 'learning'
+        | 'error'
+        | 'general'
+        | undefined,
+      content: dto.content,
+      metadata: dto.metadata,
+    }));
+    return this.logService.logs.ingestBatch(entries);
+  }
+
+  @Get()
+  async query(@Query('userId') userId: string, @Query() params: QueryLogsDto) {
+    return this.logService.logs.query({
+      userId,
+      sessionId: params.sessionId,
+      level: params.level,
+      category: params.category,
+      tier: params.tier,
+      since: params.since ? new Date(params.since) : undefined,
+      until: params.until ? new Date(params.until) : undefined,
+      limit: params.limit ? Number(params.limit) : undefined,
+      offset: params.offset ? Number(params.offset) : undefined,
+    });
+  }
+
+  @Get(':id')
+  async findOne(@Param('id') id: string) {
+    return this.logService.logs.findById(id);
+  }
+}

apps/gateway/src/log/log.dto.ts

@@ -0,0 +1,18 @@
+export interface IngestLogDto {
+  sessionId: string;
+  level?: 'debug' | 'info' | 'warn' | 'error';
+  category?: 'decision' | 'tool_use' | 'learning' | 'error' | 'general';
+  content: string;
+  metadata?: Record<string, unknown>;
+}
+
+export interface QueryLogsDto {
+  sessionId?: string;
+  level?: 'debug' | 'info' | 'warn' | 'error';
+  category?: 'decision' | 'tool_use' | 'learning' | 'error' | 'general';
+  tier?: 'hot' | 'warm' | 'cold';
+  since?: string;
+  until?: string;
+  limit?: string;
+  offset?: string;
+}

apps/gateway/src/log/log.module.ts

@@ -0,0 +1,26 @@
+import { Global, Module } from '@nestjs/common';
+import { createLogService, type LogService } from '@mosaic/log';
+import type { Db } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+import { LOG_SERVICE } from './log.tokens.js';
+import { LogController } from './log.controller.js';
+import { SummarizationService } from './summarization.service.js';
+import { CronService } from './cron.service.js';
+import { GCModule } from '../gc/gc.module.js';
+
+@Global()
+@Module({
+  imports: [GCModule],
+  providers: [
+    {
+      provide: LOG_SERVICE,
+      useFactory: (db: Db): LogService => createLogService(db),
+      inject: [DB],
+    },
+    SummarizationService,
+    CronService,
+  ],
+  controllers: [LogController],
+  exports: [LOG_SERVICE, SummarizationService],
+})
+export class LogModule {}

apps/gateway/src/log/log.tokens.ts

@@ -0,0 +1 @@
+export const LOG_SERVICE = 'LOG_SERVICE';

apps/gateway/src/log/summarization.service.ts

@@ -0,0 +1,178 @@
+import { Inject, Injectable, Logger } from '@nestjs/common';
+import type { LogService } from '@mosaic/log';
+import type { Memory } from '@mosaic/memory';
+import { LOG_SERVICE } from './log.tokens.js';
+import { MEMORY } from '../memory/memory.tokens.js';
+import { EmbeddingService } from '../memory/embedding.service.js';
+import type { Db } from '@mosaic/db';
+import { sql, summarizationJobs } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+
+const SUMMARIZATION_PROMPT = `You are a knowledge extraction assistant. Given the following agent interaction logs, extract the key decisions, learnings, and patterns. Output a concise summary (2-4 sentences) that captures the most important information for future reference. Focus on actionable insights, not raw events.
+
+Logs:
+{logs}
+
+Summary:`;
+
+interface ChatCompletion {
+  choices: Array<{ message: { content: string } }>;
+}
+
+@Injectable()
+export class SummarizationService {
+  private readonly logger = new Logger(SummarizationService.name);
+  private readonly apiKey: string | undefined;
+  private readonly baseUrl: string;
+  private readonly model: string;
+
+  constructor(
+    @Inject(LOG_SERVICE) private readonly logService: LogService,
+    @Inject(MEMORY) private readonly memory: Memory,
+    @Inject(EmbeddingService) private readonly embeddings: EmbeddingService,
+    @Inject(DB) private readonly db: Db,
+  ) {
+    this.apiKey = process.env['OPENAI_API_KEY'];
+    this.baseUrl = process.env['SUMMARIZATION_API_URL'] ?? 'https://api.openai.com/v1';
+    this.model = process.env['SUMMARIZATION_MODEL'] ?? 'gpt-4o-mini';
+  }
+
+  /**
+   * Run one summarization cycle:
+   * 1. Find hot logs older than 24h with decision/learning/tool_use categories
+   * 2. Group by session
+   * 3. Summarize each group via cheap LLM
+   * 4. Store as insights with embeddings
+   * 5. Transition processed logs to warm tier
+   */
+  async runSummarization(): Promise<{ logsProcessed: number; insightsCreated: number }> {
+    const cutoff = new Date(Date.now() - 24 * 60 * 60 * 1000); // 24h ago
+
+    // Create job record
+    const [job] = await this.db
+      .insert(summarizationJobs)
+      .values({ status: 'running', startedAt: new Date() })
+      .returning();
+
+    try {
+      const logs = await this.logService.logs.getLogsForSummarization(cutoff, 200);
+      if (logs.length === 0) {
+        await this.db
+          .update(summarizationJobs)
+          .set({ status: 'completed', completedAt: new Date() })
+          .where(sql`id = ${job!.id}`);
+        return { logsProcessed: 0, insightsCreated: 0 };
+      }
+
+      // Group logs by session
+      const bySession = new Map<string, typeof logs>();
+      for (const log of logs) {
+        const group = bySession.get(log.sessionId) ?? [];
+        group.push(log);
+        bySession.set(log.sessionId, group);
+      }
+
+      let insightsCreated = 0;
+
+      for (const [sessionId, sessionLogs] of bySession) {
+        const userId = sessionLogs[0]?.userId;
+        if (!userId) continue;
+
+        const logsText = sessionLogs.map((l) => `[${l.category}] ${l.content}`).join('\n');
+
+        const summary = await this.summarize(logsText);
+        if (!summary) continue;
+
+        const embedding = this.embeddings.available
+          ? await this.embeddings.embed(summary)
+          : undefined;
+
+        await this.memory.insights.create({
+          userId,
+          content: summary,
+          embedding: embedding ?? null,
+          source: 'summarization',
+          category: 'learning',
+          metadata: { sessionId, logCount: sessionLogs.length },
+        });
+        insightsCreated++;
+      }
+
+      // Transition processed logs to warm
+      await this.logService.logs.promoteToWarm(cutoff);
+
+      await this.db
+        .update(summarizationJobs)
+        .set({
+          status: 'completed',
+          logsProcessed: logs.length,
+          insightsCreated,
+          completedAt: new Date(),
+        })
+        .where(sql`id = ${job!.id}`);
+
+      this.logger.log(`Summarization complete: ${logs.length} logs → ${insightsCreated} insights`);
+      return { logsProcessed: logs.length, insightsCreated };
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      await this.db
+        .update(summarizationJobs)
+        .set({ status: 'failed', errorMessage: message, completedAt: new Date() })
+        .where(sql`id = ${job!.id}`);
+      this.logger.error(`Summarization failed: ${message}`);
+      throw error;
+    }
+  }
+
+  /**
+   * Run tier management:
+   * - Warm logs older than 30 days → cold
+   * - Cold logs older than 90 days → purged
+   * - Decay old insight relevance scores
+   */
+  async runTierManagement(): Promise<void> {
+    const warmCutoff = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
+    const coldCutoff = new Date(Date.now() - 90 * 24 * 60 * 60 * 1000);
+    const decayCutoff = new Date(Date.now() - 14 * 24 * 60 * 60 * 1000);
+
+    const promoted = await this.logService.logs.promoteToCold(warmCutoff);
+    const purged = await this.logService.logs.purge(coldCutoff);
+    const decayed = await this.memory.insights.decayOldInsights(decayCutoff);
+
+    this.logger.log(
+      `Tier management: ${promoted} logs→cold, ${purged} purged, ${decayed} insights decayed`,
+    );
+  }
+
+  private async summarize(logsText: string): Promise<string | null> {
+    if (!this.apiKey) {
+      this.logger.warn('No API key configured — skipping summarization');
+      return null;
+    }
+
+    const prompt = SUMMARIZATION_PROMPT.replace('{logs}', logsText);
+
+    const response = await fetch(`${this.baseUrl}/chat/completions`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bearer ${this.apiKey}`,
+      },
+      body: JSON.stringify({
+        model: this.model,
+        messages: [{ role: 'user', content: prompt }],
+        max_tokens: 300,
+        temperature: 0.3,
+      }),
+    });
+
+    if (!response.ok) {
+      const body = await response.text();
+      this.logger.error(`Summarization API error: ${response.status} ${body}`);
+      return null;
+    }
+
+    const json = (await response.json()) as ChatCompletion;
+    return json.choices[0]?.message.content ?? null;
+  }
+}

apps/gateway/src/main.ts

@@ -1,19 +1,62 @@
+import { config } from 'dotenv';
+import { resolve } from 'node:path';
+
+// Load .env from monorepo root (cwd is apps/gateway when run via pnpm filter)
+config({ path: resolve(process.cwd(), '../../.env') });
+config(); // Also load apps/gateway/.env if present (overrides)
+
 import './tracing.js';
 import 'reflect-metadata';
 import { NestFactory } from '@nestjs/core';
-import { Logger } from '@nestjs/common';
+import { Logger, ValidationPipe } from '@nestjs/common';
 import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
+import helmet from '@fastify/helmet';
 import { AppModule } from './app.module.js';
 import { mountAuthHandler } from './auth/auth.controller.js';
+import { mountMcpHandler } from './mcp/mcp.controller.js';
+import { McpService } from './mcp/mcp.service.js';
 
 async function bootstrap(): Promise<void> {
   const logger = new Logger('Bootstrap');
-  const app = await NestFactory.create<NestFastifyApplication>(AppModule, new FastifyAdapter());
+
+  if (!process.env['BETTER_AUTH_SECRET']) {
+    throw new Error('BETTER_AUTH_SECRET is required');
+  }
+
+  if (
+    process.env['AUTHENTIK_CLIENT_ID'] &&
+    (!process.env['AUTHENTIK_CLIENT_SECRET'] || !process.env['AUTHENTIK_ISSUER'])
+  ) {
+    console.warn(
+      '[warn] AUTHENTIK_CLIENT_ID is set but AUTHENTIK_CLIENT_SECRET or AUTHENTIK_ISSUER is missing — Authentik SSO will not work',
+    );
+  }
+
+  const app = await NestFactory.create<NestFastifyApplication>(
+    AppModule,
+    new FastifyAdapter({ bodyLimit: 1_048_576 }),
+  );
+
+  app.enableCors({
+    origin: process.env['GATEWAY_CORS_ORIGIN'] ?? 'http://localhost:3000',
+    credentials: true,
+    methods: ['GET', 'HEAD', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
+  });
+
+  await app.register(helmet as never, { contentSecurityPolicy: false });
+  app.useGlobalPipes(
+    new ValidationPipe({
+      whitelist: true,
+      forbidNonWhitelisted: true,
+      transform: true,
+    }),
+  );
 
   mountAuthHandler(app);
+  mountMcpHandler(app, app.get(McpService));
 
-  const port = process.env['GATEWAY_PORT'] ?? 4000;
-  await app.listen(port as number, '0.0.0.0');
+  const port = Number(process.env['GATEWAY_PORT'] ?? 4000);
+  await app.listen(port, '0.0.0.0');
   logger.log(`Gateway listening on port ${port}`);
 }
 

apps/gateway/src/mcp-client/mcp-client.dto.ts

@@ -0,0 +1,33 @@
+/**
+ * DTOs for MCP client configuration and tool discovery.
+ */
+
+export interface McpServerConfigDto {
+  /** Unique name identifying this MCP server */
+  name: string;
+  /** URL of the MCP server (streamable HTTP or SSE endpoint) */
+  url: string;
+  /** Optional HTTP headers to send with requests (e.g., Authorization) */
+  headers?: Record<string, string>;
+}
+
+export interface McpToolDto {
+  /** Namespaced tool name: "<serverName>__<toolName>" */
+  name: string;
+  /** Human-readable description of the tool */
+  description: string;
+  /** JSON Schema for tool input parameters */
+  inputSchema: Record<string, unknown>;
+  /** MCP server this tool belongs to */
+  serverName: string;
+  /** Original tool name on the remote server */
+  remoteName: string;
+}
+
+export interface McpServerStatusDto {
+  name: string;
+  url: string;
+  connected: boolean;
+  toolCount: number;
+  error?: string;
+}

apps/gateway/src/mcp-client/mcp-client.module.ts

@@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { McpClientService } from './mcp-client.service.js';
+
+@Module({
+  providers: [McpClientService],
+  exports: [McpClientService],
+})
+export class McpClientModule {}

apps/gateway/src/mcp-client/mcp-client.service.ts

@@ -0,0 +1,331 @@
+import { Injectable, Logger, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { Client } from '@modelcontextprotocol/sdk/client/index.js';
+import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
+import { SSEClientTransport } from '@modelcontextprotocol/sdk/client/sse.js';
+import { Type } from '@sinclair/typebox';
+import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
+import type { McpServerConfigDto, McpToolDto, McpServerStatusDto } from './mcp-client.dto.js';
+
+interface ConnectedServer {
+  config: McpServerConfigDto;
+  client: Client;
+  tools: McpToolDto[];
+  connected: boolean;
+  error?: string;
+}
+
+/**
+ * McpClientService connects to external MCP servers, discovers their tools,
+ * and bridges them into Pi SDK ToolDefinition format for agent sessions.
+ *
+ * Configuration is read from the MCP_SERVERS environment variable:
+ *   MCP_SERVERS='[{"name":"my-server","url":"http://localhost:3001/mcp","headers":{"Authorization":"Bearer token"}}]'
+ */
+@Injectable()
+export class McpClientService implements OnModuleInit, OnModuleDestroy {
+  private readonly logger = new Logger(McpClientService.name);
+  private readonly servers = new Map<string, ConnectedServer>();
+
+  async onModuleInit(): Promise<void> {
+    const configs = this.loadConfigs();
+    if (configs.length === 0) {
+      this.logger.log('No external MCP servers configured (MCP_SERVERS not set)');
+      return;
+    }
+
+    this.logger.log(`Connecting to ${configs.length} external MCP server(s)`);
+    await Promise.allSettled(configs.map((cfg) => this.connectServer(cfg)));
+  }
+
+  async onModuleDestroy(): Promise<void> {
+    this.logger.log(`Disconnecting from ${this.servers.size} MCP server(s)`);
+    const disconnects = Array.from(this.servers.values()).map((s) => this.disconnectServer(s));
+    await Promise.allSettled(disconnects);
+    this.servers.clear();
+  }
+
+  /**
+   * Returns all bridged Pi SDK ToolDefinitions from all connected MCP servers.
+   */
+  getToolDefinitions(): ToolDefinition[] {
+    const tools: ToolDefinition[] = [];
+    for (const server of this.servers.values()) {
+      if (!server.connected) continue;
+      for (const mcpTool of server.tools) {
+        tools.push(this.bridgeTool(server.client, mcpTool));
+      }
+    }
+    return tools;
+  }
+
+  /**
+   * Returns status information for all configured MCP servers.
+   */
+  getServerStatuses(): McpServerStatusDto[] {
+    return Array.from(this.servers.values()).map((s) => ({
+      name: s.config.name,
+      url: s.config.url,
+      connected: s.connected,
+      toolCount: s.tools.length,
+      error: s.error,
+    }));
+  }
+
+  /**
+   * Attempts to reconnect a server that has been disconnected.
+   */
+  async reconnectServer(serverName: string): Promise<void> {
+    const existing = this.servers.get(serverName);
+    if (!existing) {
+      throw new Error(`MCP server not found: ${serverName}`);
+    }
+    if (existing.connected) return;
+
+    this.logger.log(`Reconnecting to MCP server: ${serverName}`);
+    await this.connectServer(existing.config);
+  }
+
+  // ─── Private helpers ──────────────────────────────────────────────────────
+
+  private loadConfigs(): McpServerConfigDto[] {
+    const raw = process.env['MCP_SERVERS'];
+    if (!raw) return [];
+
+    try {
+      const parsed: unknown = JSON.parse(raw);
+      if (!Array.isArray(parsed)) {
+        this.logger.warn('MCP_SERVERS must be a JSON array — ignoring');
+        return [];
+      }
+
+      const configs: McpServerConfigDto[] = [];
+      for (const item of parsed) {
+        if (
+          typeof item === 'object' &&
+          item !== null &&
+          'name' in item &&
+          typeof (item as Record<string, unknown>)['name'] === 'string' &&
+          'url' in item &&
+          typeof (item as Record<string, unknown>)['url'] === 'string'
+        ) {
+          const cfg = item as McpServerConfigDto;
+          configs.push({
+            name: cfg.name,
+            url: cfg.url,
+            headers: cfg.headers,
+          });
+        } else {
+          this.logger.warn(`Skipping invalid MCP server config entry: ${JSON.stringify(item)}`);
+        }
+      }
+
+      return configs;
+    } catch (err) {
+      this.logger.error(
+        `Failed to parse MCP_SERVERS: ${err instanceof Error ? err.message : String(err)}`,
+      );
+      return [];
+    }
+  }
+
+  private async connectServer(config: McpServerConfigDto): Promise<void> {
+    const serverEntry: ConnectedServer = {
+      config,
+      client: new Client({ name: 'mosaic-gateway', version: '1.0.0' }),
+      tools: [],
+      connected: false,
+    };
+
+    // Preserve existing entry if reconnecting
+    this.servers.set(config.name, serverEntry);
+
+    try {
+      const url = new URL(config.url);
+      const headers = config.headers ?? {};
+
+      // Attempt StreamableHTTP first, fall back to SSE
+      let connected = false;
+
+      try {
+        const transport = new StreamableHTTPClientTransport(url, { requestInit: { headers } });
+        await serverEntry.client.connect(transport);
+        connected = true;
+        this.logger.log(`Connected to MCP server "${config.name}" via StreamableHTTP`);
+      } catch (streamErr) {
+        this.logger.warn(
+          `StreamableHTTP failed for "${config.name}", trying SSE: ${streamErr instanceof Error ? streamErr.message : String(streamErr)}`,
+        );
+
+        // Reset client for SSE attempt
+        serverEntry.client = new Client({ name: 'mosaic-gateway', version: '1.0.0' });
+
+        try {
+          const transport = new SSEClientTransport(url, { requestInit: { headers } });
+          await serverEntry.client.connect(transport);
+          connected = true;
+          this.logger.log(`Connected to MCP server "${config.name}" via SSE`);
+        } catch (sseErr) {
+          throw new Error(
+            `Both transports failed for "${config.name}": SSE error: ${sseErr instanceof Error ? sseErr.message : String(sseErr)}`,
+          );
+        }
+      }
+
+      if (!connected) return;
+
+      // Discover tools
+      const toolsResult = await serverEntry.client.listTools();
+      serverEntry.tools = toolsResult.tools.map((t) => ({
+        name: `${config.name}__${t.name}`,
+        description: t.description ?? `Tool ${t.name} from MCP server ${config.name}`,
+        inputSchema: (t.inputSchema as Record<string, unknown>) ?? {},
+        serverName: config.name,
+        remoteName: t.name,
+      }));
+
+      serverEntry.connected = true;
+      this.logger.log(
+        `Discovered ${serverEntry.tools.length} tool(s) from MCP server "${config.name}"`,
+      );
+    } catch (err) {
+      const message = err instanceof Error ? err.message : String(err);
+      serverEntry.error = message;
+      serverEntry.connected = false;
+      this.logger.error(`Failed to connect to MCP server "${config.name}": ${message}`);
+    }
+  }
+
+  private async disconnectServer(server: ConnectedServer): Promise<void> {
+    try {
+      await server.client.close();
+    } catch (err) {
+      this.logger.warn(
+        `Error closing MCP client for "${server.config.name}": ${err instanceof Error ? err.message : String(err)}`,
+      );
+    }
+  }
+
+  /**
+   * Bridges a single McpToolDto into a Pi SDK ToolDefinition.
+   * The MCP inputSchema is converted to a TypeBox schema representation.
+   */
+  private bridgeTool(client: Client, mcpTool: McpToolDto): ToolDefinition {
+    const schema = this.inputSchemaToTypeBox(mcpTool.inputSchema);
+
+    return {
+      name: mcpTool.name,
+      label: mcpTool.remoteName,
+      description: mcpTool.description,
+      parameters: schema,
+      execute: async (_toolCallId: string, params: unknown) => {
+        try {
+          const result = await client.callTool({
+            name: mcpTool.remoteName,
+            arguments: (params as Record<string, unknown>) ?? {},
+          });
+
+          // MCP callTool returns { content: [...], isError?: boolean }
+          const content = Array.isArray(result.content) ? result.content : [];
+          const textParts = content
+            .filter((c): c is { type: 'text'; text: string } => c.type === 'text')
+            .map((c) => c.text)
+            .join('\n');
+
+          if (result.isError) {
+            return {
+              content: [
+                {
+                  type: 'text' as const,
+                  text: `MCP tool error from "${mcpTool.serverName}/${mcpTool.remoteName}": ${textParts || 'Unknown error'}`,
+                },
+              ],
+              details: undefined,
+            };
+          }
+
+          return {
+            content:
+              content.length > 0
+                ? (content as { type: 'text'; text: string }[])
+                : [{ type: 'text' as const, text: '' }],
+            details: undefined,
+          };
+        } catch (err) {
+          const message = err instanceof Error ? err.message : String(err);
+          this.logger.error(
+            `MCP tool call failed: ${mcpTool.serverName}/${mcpTool.remoteName}: ${message}`,
+          );
+          return {
+            content: [
+              {
+                type: 'text' as const,
+                text: `Failed to call MCP tool "${mcpTool.name}": ${message}`,
+              },
+            ],
+            details: undefined,
+          };
+        }
+      },
+    };
+  }
+
+  /**
+   * Converts a JSON Schema object to a TypeBox-compatible schema.
+   * For simplicity, maps the inputSchema properties to TypeBox Type.Object.
+   * Unknown/complex schemas fall back to Type.Object with Type.Unknown values.
+   */
+  private inputSchemaToTypeBox(
+    inputSchema: Record<string, unknown>,
+  ): ReturnType<typeof Type.Object> {
+    const properties = inputSchema['properties'];
+
+    if (!properties || typeof properties !== 'object') {
+      return Type.Object({});
+    }
+
+    const required: string[] = Array.isArray(inputSchema['required'])
+      ? (inputSchema['required'] as string[])
+      : [];
+
+    const tbProps: Record<string, ReturnType<typeof Type.String>> = {};
+
+    for (const [key, schemaDef] of Object.entries(properties as Record<string, unknown>)) {
+      const def = schemaDef as Record<string, unknown>;
+      const desc = typeof def['description'] === 'string' ? def['description'] : undefined;
+      const isOptional = !required.includes(key);
+      const base = this.jsonSchemaToTypeBox(def);
+      tbProps[key] = isOptional
+        ? (Type.Optional(base) as unknown as ReturnType<typeof Type.String>)
+        : (base as unknown as ReturnType<typeof Type.String>);
+      if (desc && tbProps[key]) {
+        // Attach description via metadata
+        (tbProps[key] as Record<string, unknown>)['description'] = desc;
+      }
+    }
+
+    return Type.Object(tbProps as Parameters<typeof Type.Object>[0]);
+  }
+
+  private jsonSchemaToTypeBox(
+    def: Record<string, unknown>,
+  ):
+    | ReturnType<typeof Type.String>
+    | ReturnType<typeof Type.Number>
+    | ReturnType<typeof Type.Boolean>
+    | ReturnType<typeof Type.Unknown> {
+    const type = def['type'];
+    const desc = typeof def['description'] === 'string' ? { description: def['description'] } : {};
+
+    switch (type) {
+      case 'string':
+        return Type.String(desc);
+      case 'number':
+      case 'integer':
+        return Type.Number(desc);
+      case 'boolean':
+        return Type.Boolean(desc);
+      default:
+        return Type.Unknown(desc);
+    }
+  }
+}

apps/gateway/src/mcp-client/mcp-client.tokens.ts

@@ -0,0 +1 @@
+export const MCP_CLIENT_SERVICE = 'MCP_CLIENT_SERVICE';

apps/gateway/src/mcp/mcp.controller.ts

@@ -0,0 +1,142 @@
+import type { IncomingMessage, ServerResponse } from 'node:http';
+import { Logger } from '@nestjs/common';
+import { fromNodeHeaders } from 'better-auth/node';
+import type { Auth } from '@mosaic/auth';
+import type { NestFastifyApplication } from '@nestjs/platform-fastify';
+import type { McpService } from './mcp.service.js';
+import { AUTH } from '../auth/auth.tokens.js';
+
+/**
+ * Mounts the MCP streamable HTTP transport endpoint at /mcp on the Fastify instance.
+ *
+ * This follows the same low-level Fastify hook pattern used by the auth controller,
+ * bypassing NestJS routing to directly delegate to the MCP SDK transport handlers.
+ *
+ * Endpoint: POST /mcp (and GET /mcp for SSE stream reconnect)
+ * Auth: Requires a valid BetterAuth session (cookie or Authorization header).
+ * Session: Stateful — each initialized client gets a session ID via Mcp-Session-Id header.
+ */
+export function mountMcpHandler(app: NestFastifyApplication, mcpService: McpService): void {
+  const auth = app.get<Auth>(AUTH);
+  const logger = new Logger('McpController');
+  const fastify = app.getHttpAdapter().getInstance();
+
+  fastify.addHook(
+    'onRequest',
+    (
+      req: { raw: IncomingMessage; url: string; method: string },
+      reply: { raw: ServerResponse; hijack: () => void },
+      done: () => void,
+    ) => {
+      if (!req.url.startsWith('/mcp')) {
+        done();
+        return;
+      }
+
+      reply.hijack();
+
+      handleMcpRequest(req, reply, auth, mcpService, logger).catch((err: unknown) => {
+        logger.error(
+          `MCP request handler error: ${err instanceof Error ? err.message : String(err)}`,
+        );
+        if (!reply.raw.headersSent) {
+          reply.raw.writeHead(500, { 'Content-Type': 'application/json' });
+        }
+        if (!reply.raw.writableEnded) {
+          reply.raw.end(JSON.stringify({ error: 'Internal server error' }));
+        }
+      });
+    },
+  );
+}
+
+async function handleMcpRequest(
+  req: { raw: IncomingMessage; url: string; method: string },
+  reply: { raw: ServerResponse; hijack: () => void },
+  auth: Auth,
+  mcpService: McpService,
+  logger: Logger,
+): Promise<void> {
+  // ─── Authentication ─────────────────────────────────────────────────────
+  const headers = fromNodeHeaders(req.raw.headers);
+  const result = await auth.api.getSession({ headers });
+
+  if (!result) {
+    reply.raw.writeHead(401, { 'Content-Type': 'application/json' });
+    reply.raw.end(JSON.stringify({ error: 'Unauthorized: valid session required' }));
+    return;
+  }
+
+  const userId = result.user.id;
+
+  // ─── Session routing ─────────────────────────────────────────────────────
+  const sessionId = req.raw.headers['mcp-session-id'];
+
+  if (typeof sessionId === 'string' && sessionId.length > 0) {
+    // Existing session request
+    const transport = mcpService.getSession(sessionId);
+    if (!transport) {
+      logger.warn(`MCP session not found: ${sessionId}`);
+      reply.raw.writeHead(404, { 'Content-Type': 'application/json' });
+      reply.raw.end(JSON.stringify({ error: 'Session not found' }));
+      return;
+    }
+
+    await transport.handleRequest(req.raw, reply.raw);
+    return;
+  }
+
+  // ─── Initialize new session ───────────────────────────────────────────────
+  // Only POST requests can initialize a new session (must be initialize message)
+  if (req.method !== 'POST') {
+    reply.raw.writeHead(400, { 'Content-Type': 'application/json' });
+    reply.raw.end(
+      JSON.stringify({
+        error: 'New session must be established via POST with initialize message',
+      }),
+    );
+    return;
+  }
+
+  // Parse body to verify this is an initialize request before creating a session
+  let body: unknown;
+  try {
+    body = await readRequestBody(req.raw);
+  } catch (err) {
+    logger.warn(
+      `Failed to parse MCP request body: ${err instanceof Error ? err.message : String(err)}`,
+    );
+    reply.raw.writeHead(400, { 'Content-Type': 'application/json' });
+    reply.raw.end(JSON.stringify({ error: 'Invalid request body' }));
+    return;
+  }
+
+  // Create new session and handle this initializing request
+  const { transport } = mcpService.createSession(userId);
+  logger.log(`New MCP session created for user ${userId}`);
+
+  await transport.handleRequest(req.raw, reply.raw, body);
+}
+
+/**
+ * Reads and parses the JSON body from a Node.js IncomingMessage.
+ */
+function readRequestBody(req: IncomingMessage): Promise<unknown> {
+  return new Promise((resolve, reject) => {
+    const chunks: Buffer[] = [];
+    req.on('data', (chunk: Buffer) => chunks.push(chunk));
+    req.on('end', () => {
+      const raw = Buffer.concat(chunks).toString('utf8');
+      if (!raw) {
+        resolve(undefined);
+        return;
+      }
+      try {
+        resolve(JSON.parse(raw));
+      } catch (err) {
+        reject(err);
+      }
+    });
+    req.on('error', reject);
+  });
+}

apps/gateway/src/mcp/mcp.dto.ts

@@ -0,0 +1,19 @@
+/**
+ * MCP (Model Context Protocol) DTOs
+ *
+ * Defines the data transfer objects for the MCP streamable HTTP transport.
+ * See: https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http
+ */
+
+export interface McpToolDescriptor {
+  name: string;
+  description: string;
+  inputSchema: Record<string, unknown>;
+}
+
+export interface McpServerInfo {
+  name: string;
+  version: string;
+  protocolVersion: string;
+  tools: McpToolDescriptor[];
+}

apps/gateway/src/mcp/mcp.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { McpService } from './mcp.service.js';
+import { CoordModule } from '../coord/coord.module.js';
+
+@Module({
+  imports: [CoordModule],
+  providers: [McpService],
+  exports: [McpService],
+})
+export class McpModule {}

apps/gateway/src/mcp/mcp.service.ts

@@ -0,0 +1,429 @@
+import { Injectable, Logger, Inject, OnModuleDestroy } from '@nestjs/common';
+import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
+import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js';
+import { randomUUID } from 'node:crypto';
+import { z } from 'zod';
+import type { Brain } from '@mosaic/brain';
+import type { Memory } from '@mosaic/memory';
+import { BRAIN } from '../brain/brain.tokens.js';
+import { MEMORY } from '../memory/memory.tokens.js';
+import { EmbeddingService } from '../memory/embedding.service.js';
+import { CoordService } from '../coord/coord.service.js';
+
+interface SessionEntry {
+  server: McpServer;
+  transport: StreamableHTTPServerTransport;
+  createdAt: Date;
+  userId: string;
+}
+
+@Injectable()
+export class McpService implements OnModuleDestroy {
+  private readonly logger = new Logger(McpService.name);
+  private readonly sessions = new Map<string, SessionEntry>();
+
+  constructor(
+    @Inject(BRAIN) private readonly brain: Brain,
+    @Inject(MEMORY) private readonly memory: Memory,
+    @Inject(EmbeddingService) private readonly embeddings: EmbeddingService,
+    @Inject(CoordService) private readonly coordService: CoordService,
+  ) {}
+
+  /**
+   * Creates a new MCP session with its own server + transport pair.
+   * Returns the transport for use by the controller.
+   */
+  createSession(userId: string): { sessionId: string; transport: StreamableHTTPServerTransport } {
+    const sessionId = randomUUID();
+
+    const transport = new StreamableHTTPServerTransport({
+      sessionIdGenerator: () => sessionId,
+      onsessioninitialized: (id) => {
+        this.logger.log(`MCP session initialized: ${id} for user ${userId}`);
+      },
+    });
+
+    const server = new McpServer(
+      { name: 'mosaic-gateway', version: '1.0.0' },
+      { capabilities: { tools: {} } },
+    );
+
+    this.registerTools(server, userId);
+
+    transport.onclose = () => {
+      this.logger.log(`MCP session closed: ${sessionId}`);
+      this.sessions.delete(sessionId);
+    };
+
+    server.connect(transport).catch((err: unknown) => {
+      this.logger.error(
+        `MCP server connect error for session ${sessionId}: ${err instanceof Error ? err.message : String(err)}`,
+      );
+    });
+
+    this.sessions.set(sessionId, { server, transport, createdAt: new Date(), userId });
+    return { sessionId, transport };
+  }
+
+  /**
+   * Returns the transport for an existing session, or null if not found.
+   */
+  getSession(sessionId: string): StreamableHTTPServerTransport | null {
+    return this.sessions.get(sessionId)?.transport ?? null;
+  }
+
+  /**
+   * Registers all platform tools on the given McpServer instance.
+   */
+  private registerTools(server: McpServer, _userId: string): void {
+    // ─── Brain: Project tools ────────────────────────────────────────────
+
+    server.registerTool(
+      'brain_list_projects',
+      {
+        description: 'List all projects in the brain.',
+        inputSchema: z.object({}),
+      },
+      async () => {
+        const projects = await this.brain.projects.findAll();
+        return {
+          content: [{ type: 'text' as const, text: JSON.stringify(projects, null, 2) }],
+        };
+      },
+    );
+
+    server.registerTool(
+      'brain_get_project',
+      {
+        description: 'Get a project by ID.',
+        inputSchema: z.object({
+          id: z.string().describe('Project ID (UUID)'),
+        }),
+      },
+      async ({ id }) => {
+        const project = await this.brain.projects.findById(id);
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: project ? JSON.stringify(project, null, 2) : `Project not found: ${id}`,
+            },
+          ],
+        };
+      },
+    );
+
+    // ─── Brain: Task tools ───────────────────────────────────────────────
+
+    server.registerTool(
+      'brain_list_tasks',
+      {
+        description: 'List tasks, optionally filtered by project, mission, or status.',
+        inputSchema: z.object({
+          projectId: z.string().optional().describe('Filter by project ID'),
+          missionId: z.string().optional().describe('Filter by mission ID'),
+          status: z.string().optional().describe('Filter by status'),
+        }),
+      },
+      async ({ projectId, missionId, status }) => {
+        type TaskStatus = 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';
+        let tasks;
+        if (projectId) tasks = await this.brain.tasks.findByProject(projectId);
+        else if (missionId) tasks = await this.brain.tasks.findByMission(missionId);
+        else if (status) tasks = await this.brain.tasks.findByStatus(status as TaskStatus);
+        else tasks = await this.brain.tasks.findAll();
+        return { content: [{ type: 'text' as const, text: JSON.stringify(tasks, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'brain_create_task',
+      {
+        description: 'Create a new task in the brain.',
+        inputSchema: z.object({
+          title: z.string().describe('Task title'),
+          description: z.string().optional().describe('Task description'),
+          projectId: z.string().optional().describe('Project ID'),
+          missionId: z.string().optional().describe('Mission ID'),
+          priority: z.string().optional().describe('Priority: low, medium, high, critical'),
+        }),
+      },
+      async (params) => {
+        type Priority = 'low' | 'medium' | 'high' | 'critical';
+        const task = await this.brain.tasks.create({
+          ...params,
+          priority: params.priority as Priority | undefined,
+        });
+        return { content: [{ type: 'text' as const, text: JSON.stringify(task, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'brain_update_task',
+      {
+        description: 'Update an existing task.',
+        inputSchema: z.object({
+          id: z.string().describe('Task ID'),
+          title: z.string().optional(),
+          description: z.string().optional(),
+          status: z
+            .string()
+            .optional()
+            .describe('not-started, in-progress, blocked, done, cancelled'),
+          priority: z.string().optional(),
+        }),
+      },
+      async ({ id, ...updates }) => {
+        type TaskStatus = 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';
+        type Priority = 'low' | 'medium' | 'high' | 'critical';
+        const task = await this.brain.tasks.update(id, {
+          ...updates,
+          status: updates.status as TaskStatus | undefined,
+          priority: updates.priority as Priority | undefined,
+        });
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: task ? JSON.stringify(task, null, 2) : `Task not found: ${id}`,
+            },
+          ],
+        };
+      },
+    );
+
+    // ─── Brain: Mission tools ────────────────────────────────────────────
+
+    server.registerTool(
+      'brain_list_missions',
+      {
+        description: 'List all missions, optionally filtered by project.',
+        inputSchema: z.object({
+          projectId: z.string().optional().describe('Filter by project ID'),
+        }),
+      },
+      async ({ projectId }) => {
+        const missions = projectId
+          ? await this.brain.missions.findByProject(projectId)
+          : await this.brain.missions.findAll();
+        return { content: [{ type: 'text' as const, text: JSON.stringify(missions, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'brain_list_conversations',
+      {
+        description: 'List conversations for a user.',
+        inputSchema: z.object({
+          userId: z.string().describe('User ID'),
+        }),
+      },
+      async ({ userId }) => {
+        const conversations = await this.brain.conversations.findAll(userId);
+        return {
+          content: [{ type: 'text' as const, text: JSON.stringify(conversations, null, 2) }],
+        };
+      },
+    );
+
+    // ─── Memory tools ────────────────────────────────────────────────────
+
+    server.registerTool(
+      'memory_search',
+      {
+        description:
+          'Search across stored insights and knowledge using natural language. Returns semantically similar results.',
+        inputSchema: z.object({
+          userId: z.string().describe('User ID to search memory for'),
+          query: z.string().describe('Natural language search query'),
+          limit: z.number().optional().describe('Max results (default 5)'),
+        }),
+      },
+      async ({ userId, query, limit }) => {
+        if (!this.embeddings.available) {
+          return {
+            content: [
+              {
+                type: 'text' as const,
+                text: 'Semantic search unavailable — no embedding provider configured',
+              },
+            ],
+          };
+        }
+        const embedding = await this.embeddings.embed(query);
+        const results = await this.memory.insights.searchByEmbedding(userId, embedding, limit ?? 5);
+        return { content: [{ type: 'text' as const, text: JSON.stringify(results, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'memory_get_preferences',
+      {
+        description: 'Retrieve stored preferences for a user.',
+        inputSchema: z.object({
+          userId: z.string().describe('User ID'),
+          category: z
+            .string()
+            .optional()
+            .describe('Filter by category: communication, coding, workflow, appearance, general'),
+        }),
+      },
+      async ({ userId, category }) => {
+        type Cat = 'communication' | 'coding' | 'workflow' | 'appearance' | 'general';
+        const prefs = category
+          ? await this.memory.preferences.findByUserAndCategory(userId, category as Cat)
+          : await this.memory.preferences.findByUser(userId);
+        return { content: [{ type: 'text' as const, text: JSON.stringify(prefs, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'memory_save_preference',
+      {
+        description:
+          'Store a learned user preference (e.g., "prefers tables over paragraphs", "timezone: America/Chicago").',
+        inputSchema: z.object({
+          userId: z.string().describe('User ID'),
+          key: z.string().describe('Preference key'),
+          value: z.string().describe('Preference value (JSON string)'),
+          category: z
+            .string()
+            .optional()
+            .describe('Category: communication, coding, workflow, appearance, general'),
+        }),
+      },
+      async ({ userId, key, value, category }) => {
+        type Cat = 'communication' | 'coding' | 'workflow' | 'appearance' | 'general';
+        let parsedValue: unknown;
+        try {
+          parsedValue = JSON.parse(value);
+        } catch {
+          parsedValue = value;
+        }
+        const pref = await this.memory.preferences.upsert({
+          userId,
+          key,
+          value: parsedValue,
+          category: (category as Cat) ?? 'general',
+          source: 'agent',
+        });
+        return { content: [{ type: 'text' as const, text: JSON.stringify(pref, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'memory_save_insight',
+      {
+        description:
+          'Store a learned insight, decision, or knowledge extracted from the current interaction.',
+        inputSchema: z.object({
+          userId: z.string().describe('User ID'),
+          content: z.string().describe('The insight or knowledge to store'),
+          category: z
+            .string()
+            .optional()
+            .describe('Category: decision, learning, preference, fact, pattern, general'),
+        }),
+      },
+      async ({ userId, content, category }) => {
+        type Cat = 'decision' | 'learning' | 'preference' | 'fact' | 'pattern' | 'general';
+        const embedding = this.embeddings.available ? await this.embeddings.embed(content) : null;
+        const insight = await this.memory.insights.create({
+          userId,
+          content,
+          embedding,
+          source: 'agent',
+          category: (category as Cat) ?? 'learning',
+        });
+        return { content: [{ type: 'text' as const, text: JSON.stringify(insight, null, 2) }] };
+      },
+    );
+
+    // ─── Coord tools ─────────────────────────────────────────────────────
+
+    server.registerTool(
+      'coord_mission_status',
+      {
+        description:
+          'Get the current orchestration mission status including milestones, tasks, and active session.',
+        inputSchema: z.object({
+          projectPath: z
+            .string()
+            .optional()
+            .describe('Project path. Defaults to gateway working directory.'),
+        }),
+      },
+      async ({ projectPath }) => {
+        const resolvedPath = projectPath ?? process.cwd();
+        const status = await this.coordService.getMissionStatus(resolvedPath);
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: status ? JSON.stringify(status, null, 2) : 'No active coord mission found.',
+            },
+          ],
+        };
+      },
+    );
+
+    server.registerTool(
+      'coord_list_tasks',
+      {
+        description: 'List all tasks from the orchestration TASKS.md file.',
+        inputSchema: z.object({
+          projectPath: z
+            .string()
+            .optional()
+            .describe('Project path. Defaults to gateway working directory.'),
+        }),
+      },
+      async ({ projectPath }) => {
+        const resolvedPath = projectPath ?? process.cwd();
+        const tasks = await this.coordService.listTasks(resolvedPath);
+        return { content: [{ type: 'text' as const, text: JSON.stringify(tasks, null, 2) }] };
+      },
+    );
+
+    server.registerTool(
+      'coord_task_detail',
+      {
+        description: 'Get detailed status for a specific orchestration task.',
+        inputSchema: z.object({
+          taskId: z.string().describe('Task ID (e.g. P2-005)'),
+          projectPath: z
+            .string()
+            .optional()
+            .describe('Project path. Defaults to gateway working directory.'),
+        }),
+      },
+      async ({ taskId, projectPath }) => {
+        const resolvedPath = projectPath ?? process.cwd();
+        const detail = await this.coordService.getTaskStatus(resolvedPath, taskId);
+        return {
+          content: [
+            {
+              type: 'text' as const,
+              text: detail
+                ? JSON.stringify(detail, null, 2)
+                : `Task ${taskId} not found in coord mission.`,
+            },
+          ],
+        };
+      },
+    );
+  }
+
+  async onModuleDestroy(): Promise<void> {
+    this.logger.log(`Closing ${this.sessions.size} MCP sessions on shutdown`);
+    const closePromises = Array.from(this.sessions.values()).map(({ transport }) =>
+      transport.close().catch((err: unknown) => {
+        this.logger.warn(
+          `Error closing MCP transport: ${err instanceof Error ? err.message : String(err)}`,
+        );
+      }),
+    );
+    await Promise.all(closePromises);
+    this.sessions.clear();
+  }
+}

apps/gateway/src/mcp/mcp.tokens.ts

@@ -0,0 +1 @@
+export const MCP_SERVICE = 'MCP_SERVICE';

apps/gateway/src/memory/embedding.service.ts

@@ -0,0 +1,69 @@
+import { Injectable, Logger } from '@nestjs/common';
+import type { EmbeddingProvider } from '@mosaic/memory';
+
+const DEFAULT_MODEL = 'text-embedding-3-small';
+const DEFAULT_DIMENSIONS = 1536;
+
+interface EmbeddingResponse {
+  data: Array<{ embedding: number[]; index: number }>;
+  model: string;
+  usage: { prompt_tokens: number; total_tokens: number };
+}
+
+/**
+ * Generates embeddings via the OpenAI-compatible embeddings API.
+ * Supports OpenAI, Azure OpenAI, and any provider with a compatible endpoint.
+ */
+@Injectable()
+export class EmbeddingService implements EmbeddingProvider {
+  private readonly logger = new Logger(EmbeddingService.name);
+  private readonly apiKey: string | undefined;
+  private readonly baseUrl: string;
+  private readonly model: string;
+
+  readonly dimensions = DEFAULT_DIMENSIONS;
+
+  constructor() {
+    this.apiKey = process.env['OPENAI_API_KEY'];
+    this.baseUrl = process.env['EMBEDDING_API_URL'] ?? 'https://api.openai.com/v1';
+    this.model = process.env['EMBEDDING_MODEL'] ?? DEFAULT_MODEL;
+  }
+
+  get available(): boolean {
+    return !!this.apiKey;
+  }
+
+  async embed(text: string): Promise<number[]> {
+    const results = await this.embedBatch([text]);
+    return results[0]!;
+  }
+
+  async embedBatch(texts: string[]): Promise<number[][]> {
+    if (!this.apiKey) {
+      this.logger.warn('No OPENAI_API_KEY configured — returning zero vectors');
+      return texts.map(() => new Array<number>(this.dimensions).fill(0));
+    }
+
+    const response = await fetch(`${this.baseUrl}/embeddings`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bearer ${this.apiKey}`,
+      },
+      body: JSON.stringify({
+        model: this.model,
+        input: texts,
+        dimensions: this.dimensions,
+      }),
+    });
+
+    if (!response.ok) {
+      const body = await response.text();
+      this.logger.error(`Embedding API error: ${response.status} ${body}`);
+      throw new Error(`Embedding API returned ${response.status}`);
+    }
+
+    const json = (await response.json()) as EmbeddingResponse;
+    return json.data.sort((a, b) => a.index - b.index).map((d) => d.embedding);
+  }
+}

apps/gateway/src/memory/memory.controller.ts

@@ -0,0 +1,127 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  NotFoundException,
+  Param,
+  Post,
+  Query,
+  UseGuards,
+} from '@nestjs/common';
+import type { Memory } from '@mosaic/memory';
+import { MEMORY } from './memory.tokens.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+import { EmbeddingService } from './embedding.service.js';
+import type { UpsertPreferenceDto, CreateInsightDto, SearchMemoryDto } from './memory.dto.js';
+
+@Controller('api/memory')
+@UseGuards(AuthGuard)
+export class MemoryController {
+  constructor(
+    @Inject(MEMORY) private readonly memory: Memory,
+    @Inject(EmbeddingService) private readonly embeddings: EmbeddingService,
+  ) {}
+
+  // ─── Preferences ────────────────────────────────────────────────────
+
+  @Get('preferences')
+  async listPreferences(@CurrentUser() user: { id: string }, @Query('category') category?: string) {
+    if (category) {
+      return this.memory.preferences.findByUserAndCategory(
+        user.id,
+        category as Parameters<typeof this.memory.preferences.findByUserAndCategory>[1],
+      );
+    }
+    return this.memory.preferences.findByUser(user.id);
+  }
+
+  @Get('preferences/:key')
+  async getPreference(@CurrentUser() user: { id: string }, @Param('key') key: string) {
+    const pref = await this.memory.preferences.findByUserAndKey(user.id, key);
+    if (!pref) throw new NotFoundException('Preference not found');
+    return pref;
+  }
+
+  @Post('preferences')
+  async upsertPreference(@CurrentUser() user: { id: string }, @Body() dto: UpsertPreferenceDto) {
+    return this.memory.preferences.upsert({
+      userId: user.id,
+      key: dto.key,
+      value: dto.value,
+      category: dto.category,
+      source: dto.source,
+    });
+  }
+
+  @Delete('preferences/:key')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async removePreference(@CurrentUser() user: { id: string }, @Param('key') key: string) {
+    const deleted = await this.memory.preferences.remove(user.id, key);
+    if (!deleted) throw new NotFoundException('Preference not found');
+  }
+
+  // ─── Insights ───────────────────────────────────────────────────────
+
+  @Get('insights')
+  async listInsights(@CurrentUser() user: { id: string }, @Query('limit') limit?: string) {
+    return this.memory.insights.findByUser(user.id, limit ? Number(limit) : undefined);
+  }
+
+  @Get('insights/:id')
+  async getInsight(@Param('id') id: string) {
+    const insight = await this.memory.insights.findById(id);
+    if (!insight) throw new NotFoundException('Insight not found');
+    return insight;
+  }
+
+  @Post('insights')
+  async createInsight(@CurrentUser() user: { id: string }, @Body() dto: CreateInsightDto) {
+    const embedding = this.embeddings.available
+      ? await this.embeddings.embed(dto.content)
+      : undefined;
+
+    return this.memory.insights.create({
+      userId: user.id,
+      content: dto.content,
+      source: dto.source,
+      category: dto.category,
+      metadata: dto.metadata,
+      embedding: embedding ?? null,
+    });
+  }
+
+  @Delete('insights/:id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async removeInsight(@Param('id') id: string) {
+    const deleted = await this.memory.insights.remove(id);
+    if (!deleted) throw new NotFoundException('Insight not found');
+  }
+
+  // ─── Search ─────────────────────────────────────────────────────────
+
+  @Post('search')
+  async searchMemory(@CurrentUser() user: { id: string }, @Body() dto: SearchMemoryDto) {
+    if (!this.embeddings.available) {
+      return {
+        query: dto.query,
+        results: [],
+        message: 'Semantic search requires OPENAI_API_KEY for embeddings',
+      };
+    }
+
+    const queryEmbedding = await this.embeddings.embed(dto.query);
+    const results = await this.memory.insights.searchByEmbedding(
+      user.id,
+      queryEmbedding,
+      dto.limit ?? 10,
+      dto.maxDistance ?? 0.8,
+    );
+
+    return { query: dto.query, results };
+  }
+}

apps/gateway/src/memory/memory.dto.ts

@@ -0,0 +1,19 @@
+export interface UpsertPreferenceDto {
+  key: string;
+  value: unknown;
+  category?: 'communication' | 'coding' | 'workflow' | 'appearance' | 'general';
+  source?: string;
+}
+
+export interface CreateInsightDto {
+  content: string;
+  source?: 'agent' | 'user' | 'summarization' | 'system';
+  category?: 'decision' | 'learning' | 'preference' | 'fact' | 'pattern' | 'general';
+  metadata?: Record<string, unknown>;
+}
+
+export interface SearchMemoryDto {
+  query: string;
+  limit?: number;
+  maxDistance?: number;
+}

apps/gateway/src/memory/memory.module.ts

@@ -0,0 +1,22 @@
+import { Global, Module } from '@nestjs/common';
+import { createMemory, type Memory } from '@mosaic/memory';
+import type { Db } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+import { MEMORY } from './memory.tokens.js';
+import { MemoryController } from './memory.controller.js';
+import { EmbeddingService } from './embedding.service.js';
+
+@Global()
+@Module({
+  providers: [
+    {
+      provide: MEMORY,
+      useFactory: (db: Db): Memory => createMemory(db),
+      inject: [DB],
+    },
+    EmbeddingService,
+  ],
+  controllers: [MemoryController],
+  exports: [MEMORY, EmbeddingService],
+})
+export class MemoryModule {}

apps/gateway/src/memory/memory.tokens.ts

@@ -0,0 +1 @@
+export const MEMORY = 'MEMORY';

apps/gateway/src/missions/missions.controller.ts

@@ -15,37 +15,55 @@ import {
 import type { Brain } from '@mosaic/brain';
 import { BRAIN } from '../brain/brain.tokens.js';
 import { AuthGuard } from '../auth/auth.guard.js';
-import type { CreateMissionDto, UpdateMissionDto } from './missions.dto.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+import {
+  CreateMissionDto,
+  UpdateMissionDto,
+  CreateMissionTaskDto,
+  UpdateMissionTaskDto,
+} from './missions.dto.js';
 
 @Controller('api/missions')
 @UseGuards(AuthGuard)
 export class MissionsController {
   constructor(@Inject(BRAIN) private readonly brain: Brain) {}
 
+  // ── Missions CRUD (user-scoped) ──
+
   @Get()
-  async list() {
-    return this.brain.missions.findAll();
+  async list(@CurrentUser() user: { id: string }) {
+    return this.brain.missions.findAllByUser(user.id);
   }
 
   @Get(':id')
-  async findOne(@Param('id') id: string) {
-    const mission = await this.brain.missions.findById(id);
+  async findOne(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    const mission = await this.brain.missions.findByIdAndUser(id, user.id);
     if (!mission) throw new NotFoundException('Mission not found');
     return mission;
   }
 
   @Post()
-  async create(@Body() dto: CreateMissionDto) {
+  async create(@Body() dto: CreateMissionDto, @CurrentUser() user: { id: string }) {
     return this.brain.missions.create({
       name: dto.name,
       description: dto.description,
       projectId: dto.projectId,
+      userId: user.id,
+      phase: dto.phase,
+      milestones: dto.milestones,
+      config: dto.config,
       status: dto.status,
     });
   }
 
   @Patch(':id')
-  async update(@Param('id') id: string, @Body() dto: UpdateMissionDto) {
+  async update(
+    @Param('id') id: string,
+    @Body() dto: UpdateMissionDto,
+    @CurrentUser() user: { id: string },
+  ) {
+    const existing = await this.brain.missions.findByIdAndUser(id, user.id);
+    if (!existing) throw new NotFoundException('Mission not found');
     const mission = await this.brain.missions.update(id, dto);
     if (!mission) throw new NotFoundException('Mission not found');
     return mission;
@@ -53,8 +71,82 @@ export class MissionsController {
 
   @Delete(':id')
   @HttpCode(HttpStatus.NO_CONTENT)
-  async remove(@Param('id') id: string) {
+  async remove(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    const existing = await this.brain.missions.findByIdAndUser(id, user.id);
+    if (!existing) throw new NotFoundException('Mission not found');
     const deleted = await this.brain.missions.remove(id);
     if (!deleted) throw new NotFoundException('Mission not found');
   }
+
+  // ── Mission Tasks sub-routes ──
+
+  @Get(':missionId/tasks')
+  async listTasks(@Param('missionId') missionId: string, @CurrentUser() user: { id: string }) {
+    const mission = await this.brain.missions.findByIdAndUser(missionId, user.id);
+    if (!mission) throw new NotFoundException('Mission not found');
+    return this.brain.missionTasks.findByMissionAndUser(missionId, user.id);
+  }
+
+  @Get(':missionId/tasks/:taskId')
+  async getTask(
+    @Param('missionId') missionId: string,
+    @Param('taskId') taskId: string,
+    @CurrentUser() user: { id: string },
+  ) {
+    const mission = await this.brain.missions.findByIdAndUser(missionId, user.id);
+    if (!mission) throw new NotFoundException('Mission not found');
+    const task = await this.brain.missionTasks.findByIdAndUser(taskId, user.id);
+    if (!task) throw new NotFoundException('Mission task not found');
+    return task;
+  }
+
+  @Post(':missionId/tasks')
+  async createTask(
+    @Param('missionId') missionId: string,
+    @Body() dto: CreateMissionTaskDto,
+    @CurrentUser() user: { id: string },
+  ) {
+    const mission = await this.brain.missions.findByIdAndUser(missionId, user.id);
+    if (!mission) throw new NotFoundException('Mission not found');
+    return this.brain.missionTasks.create({
+      missionId,
+      taskId: dto.taskId,
+      userId: user.id,
+      status: dto.status,
+      description: dto.description,
+      notes: dto.notes,
+      pr: dto.pr,
+    });
+  }
+
+  @Patch(':missionId/tasks/:taskId')
+  async updateTask(
+    @Param('missionId') missionId: string,
+    @Param('taskId') taskId: string,
+    @Body() dto: UpdateMissionTaskDto,
+    @CurrentUser() user: { id: string },
+  ) {
+    const mission = await this.brain.missions.findByIdAndUser(missionId, user.id);
+    if (!mission) throw new NotFoundException('Mission not found');
+    const existing = await this.brain.missionTasks.findByIdAndUser(taskId, user.id);
+    if (!existing) throw new NotFoundException('Mission task not found');
+    const updated = await this.brain.missionTasks.update(taskId, dto);
+    if (!updated) throw new NotFoundException('Mission task not found');
+    return updated;
+  }
+
+  @Delete(':missionId/tasks/:taskId')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async removeTask(
+    @Param('missionId') missionId: string,
+    @Param('taskId') taskId: string,
+    @CurrentUser() user: { id: string },
+  ) {
+    const mission = await this.brain.missions.findByIdAndUser(missionId, user.id);
+    if (!mission) throw new NotFoundException('Mission not found');
+    const existing = await this.brain.missionTasks.findByIdAndUser(taskId, user.id);
+    if (!existing) throw new NotFoundException('Mission task not found');
+    const deleted = await this.brain.missionTasks.remove(taskId);
+    if (!deleted) throw new NotFoundException('Mission task not found');
+  }
 }

apps/gateway/src/missions/missions.dto.ts

@@ -1,14 +1,123 @@
-export interface CreateMissionDto {
-  name: string;
+import { IsArray, IsIn, IsObject, IsOptional, IsString, IsUUID, MaxLength } from 'class-validator';
+
+const missionStatuses = ['planning', 'active', 'paused', 'completed', 'failed'] as const;
+const taskStatuses = ['not-started', 'in-progress', 'blocked', 'done', 'cancelled'] as const;
+
+export class CreateMissionDto {
+  @IsString()
+  @MaxLength(255)
+  name!: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
   description?: string;
+
+  @IsOptional()
+  @IsUUID()
   projectId?: string;
+
+  @IsOptional()
+  @IsIn(missionStatuses)
   status?: 'planning' | 'active' | 'paused' | 'completed' | 'failed';
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  phase?: string;
+
+  @IsOptional()
+  @IsArray()
+  milestones?: Record<string, unknown>[];
+
+  @IsOptional()
+  @IsObject()
+  config?: Record<string, unknown>;
 }
 
-export interface UpdateMissionDto {
+export class UpdateMissionDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
   name?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
   description?: string | null;
+
+  @IsOptional()
+  @IsUUID()
   projectId?: string | null;
+
+  @IsOptional()
+  @IsIn(missionStatuses)
   status?: 'planning' | 'active' | 'paused' | 'completed' | 'failed';
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  phase?: string;
+
+  @IsOptional()
+  @IsArray()
+  milestones?: Record<string, unknown>[];
+
+  @IsOptional()
+  @IsObject()
+  config?: Record<string, unknown>;
+
+  @IsOptional()
+  @IsObject()
   metadata?: Record<string, unknown> | null;
 }
+
+export class CreateMissionTaskDto {
+  @IsOptional()
+  @IsUUID()
+  taskId?: string;
+
+  @IsOptional()
+  @IsIn(taskStatuses)
+  status?: 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
+  description?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
+  notes?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  pr?: string;
+}
+
+export class UpdateMissionTaskDto {
+  @IsOptional()
+  @IsUUID()
+  taskId?: string;
+
+  @IsOptional()
+  @IsIn(taskStatuses)
+  status?: 'not-started' | 'in-progress' | 'blocked' | 'done' | 'cancelled';
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
+  description?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
+  notes?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
+  pr?: string;
+}

apps/gateway/src/plugin/plugin.interface.ts

@@ -0,0 +1,11 @@
+export interface IChannelPlugin {
+  readonly name: string;
+  start(): Promise<void>;
+  stop(): Promise<void>;
+  /** Called when a new project is bootstrapped. Return channelId if a channel was created. */
+  onProjectCreated?(project: {
+    id: string;
+    name: string;
+    description?: string;
+  }): Promise<{ channelId: string } | null>;
+}

apps/gateway/src/plugin/plugin.module.ts

@@ -0,0 +1,117 @@
+import {
+  Global,
+  Inject,
+  Logger,
+  Module,
+  type OnModuleDestroy,
+  type OnModuleInit,
+} from '@nestjs/common';
+import { DiscordPlugin } from '@mosaic/discord-plugin';
+import { TelegramPlugin } from '@mosaic/telegram-plugin';
+import { PluginService } from './plugin.service.js';
+import type { IChannelPlugin } from './plugin.interface.js';
+import { PLUGIN_REGISTRY } from './plugin.tokens.js';
+
+class DiscordChannelPluginAdapter implements IChannelPlugin {
+  readonly name = 'discord';
+
+  constructor(private readonly plugin: DiscordPlugin) {}
+
+  async start(): Promise<void> {
+    await this.plugin.start();
+  }
+
+  async stop(): Promise<void> {
+    await this.plugin.stop();
+  }
+
+  async onProjectCreated(project: {
+    id: string;
+    name: string;
+    description?: string;
+  }): Promise<{ channelId: string } | null> {
+    return this.plugin.createProjectChannel(project);
+  }
+}
+
+class TelegramChannelPluginAdapter implements IChannelPlugin {
+  readonly name = 'telegram';
+
+  constructor(private readonly plugin: TelegramPlugin) {}
+
+  async start(): Promise<void> {
+    await this.plugin.start();
+  }
+
+  async stop(): Promise<void> {
+    await this.plugin.stop();
+  }
+}
+
+const DEFAULT_GATEWAY_URL = 'http://localhost:4000';
+
+function createPluginRegistry(): IChannelPlugin[] {
+  const plugins: IChannelPlugin[] = [];
+  const discordToken = process.env['DISCORD_BOT_TOKEN'];
+  const discordGuildId = process.env['DISCORD_GUILD_ID'];
+  const discordGatewayUrl = process.env['DISCORD_GATEWAY_URL'] ?? DEFAULT_GATEWAY_URL;
+
+  if (discordToken) {
+    plugins.push(
+      new DiscordChannelPluginAdapter(
+        new DiscordPlugin({
+          token: discordToken,
+          guildId: discordGuildId,
+          gatewayUrl: discordGatewayUrl,
+        }),
+      ),
+    );
+  }
+
+  const telegramToken = process.env['TELEGRAM_BOT_TOKEN'];
+  const telegramGatewayUrl = process.env['TELEGRAM_GATEWAY_URL'] ?? DEFAULT_GATEWAY_URL;
+
+  if (telegramToken) {
+    plugins.push(
+      new TelegramChannelPluginAdapter(
+        new TelegramPlugin({
+          token: telegramToken,
+          gatewayUrl: telegramGatewayUrl,
+        }),
+      ),
+    );
+  }
+
+  return plugins;
+}
+
+@Global()
+@Module({
+  providers: [
+    {
+      provide: PLUGIN_REGISTRY,
+      useFactory: (): IChannelPlugin[] => createPluginRegistry(),
+    },
+    PluginService,
+  ],
+  exports: [PluginService, PLUGIN_REGISTRY],
+})
+export class PluginModule implements OnModuleInit, OnModuleDestroy {
+  private readonly logger = new Logger(PluginModule.name);
+
+  constructor(@Inject(PLUGIN_REGISTRY) private readonly plugins: IChannelPlugin[]) {}
+
+  async onModuleInit(): Promise<void> {
+    for (const plugin of this.plugins) {
+      this.logger.log(`Starting plugin: ${plugin.name}`);
+      await plugin.start();
+    }
+  }
+
+  async onModuleDestroy(): Promise<void> {
+    for (const plugin of [...this.plugins].reverse()) {
+      this.logger.log(`Stopping plugin: ${plugin.name}`);
+      await plugin.stop();
+    }
+  }
+}

apps/gateway/src/plugin/plugin.service.ts

@@ -0,0 +1,16 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { PLUGIN_REGISTRY } from './plugin.tokens.js';
+import type { IChannelPlugin } from './plugin.interface.js';
+
+@Injectable()
+export class PluginService {
+  constructor(@Inject(PLUGIN_REGISTRY) private readonly plugins: IChannelPlugin[]) {}
+
+  getPlugins(): IChannelPlugin[] {
+    return this.plugins;
+  }
+
+  getPlugin(name: string): IChannelPlugin | undefined {
+    return this.plugins.find((plugin: IChannelPlugin) => plugin.name === name);
+  }
+}

apps/gateway/src/plugin/plugin.tokens.ts

@@ -0,0 +1 @@
+export const PLUGIN_REGISTRY = Symbol('PLUGIN_REGISTRY');

apps/gateway/src/preferences/preferences.controller.ts

@@ -0,0 +1,44 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  Param,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import { PreferencesService } from './preferences.service.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+
+@Controller('api/preferences')
+@UseGuards(AuthGuard)
+export class PreferencesController {
+  constructor(@Inject(PreferencesService) private readonly preferences: PreferencesService) {}
+
+  @Get()
+  async show(@CurrentUser() user: { id: string }): Promise<Record<string, unknown>> {
+    return this.preferences.getEffective(user.id);
+  }
+
+  @Post()
+  @HttpCode(HttpStatus.OK)
+  async set(
+    @CurrentUser() user: { id: string },
+    @Body() body: { key: string; value: unknown },
+  ): Promise<{ success: boolean; message: string }> {
+    return this.preferences.set(user.id, body.key, body.value);
+  }
+
+  @Delete(':key')
+  @HttpCode(HttpStatus.OK)
+  async reset(
+    @CurrentUser() user: { id: string },
+    @Param('key') key: string,
+  ): Promise<{ success: boolean; message: string }> {
+    return this.preferences.reset(user.id, key);
+  }
+}

apps/gateway/src/preferences/preferences.module.ts

@@ -0,0 +1,12 @@
+import { Global, Module } from '@nestjs/common';
+import { PreferencesService } from './preferences.service.js';
+import { PreferencesController } from './preferences.controller.js';
+import { SystemOverrideService } from './system-override.service.js';
+
+@Global()
+@Module({
+  controllers: [PreferencesController],
+  providers: [PreferencesService, SystemOverrideService],
+  exports: [PreferencesService, SystemOverrideService],
+})
+export class PreferencesModule {}

apps/gateway/src/preferences/preferences.service.spec.ts

@@ -0,0 +1,167 @@
+import { describe, it, expect, vi } from 'vitest';
+import { PreferencesService, PLATFORM_DEFAULTS, IMMUTABLE_KEYS } from './preferences.service.js';
+import type { Db } from '@mosaic/db';
+
+/**
+ * Build a mock Drizzle DB where the select chain supports:
+ *   db.select().from().where()            → resolves to `listRows`
+ *   db.select().from().where().limit(n)   → resolves to `singleRow`
+ */
+function makeMockDb(
+  listRows: Array<{ key: string; value: unknown }> = [],
+  singleRow: Array<{ id: string }> = [],
+): Db {
+  const chainWithLimit = {
+    limit: vi.fn().mockResolvedValue(singleRow),
+    then: (resolve: (v: typeof listRows) => unknown) => Promise.resolve(listRows).then(resolve),
+  };
+  const selectFrom = {
+    from: vi.fn().mockReturnThis(),
+    where: vi.fn().mockReturnValue(chainWithLimit),
+  };
+  const updateResult = {
+    set: vi.fn().mockReturnThis(),
+    where: vi.fn().mockResolvedValue([]),
+  };
+  const deleteResult = {
+    where: vi.fn().mockResolvedValue([]),
+  };
+  const insertResult = {
+    values: vi.fn().mockResolvedValue([]),
+  };
+
+  return {
+    select: vi.fn().mockReturnValue(selectFrom),
+    update: vi.fn().mockReturnValue(updateResult),
+    delete: vi.fn().mockReturnValue(deleteResult),
+    insert: vi.fn().mockReturnValue(insertResult),
+  } as unknown as Db;
+}
+
+describe('PreferencesService', () => {
+  describe('getEffective', () => {
+    it('returns platform defaults when user has no overrides', async () => {
+      const db = makeMockDb([]);
+      const service = new PreferencesService(db);
+      const result = await service.getEffective('user-1');
+
+      expect(result['agent.thinkingLevel']).toBe('auto');
+      expect(result['agent.streamingEnabled']).toBe(true);
+      expect(result['session.autoCompactEnabled']).toBe(true);
+      expect(result['session.autoCompactThreshold']).toBe(0.8);
+    });
+
+    it('applies user overrides for mutable keys', async () => {
+      const db = makeMockDb([
+        { key: 'agent.thinkingLevel', value: 'high' },
+        { key: 'response.language', value: 'es' },
+      ]);
+
+      const service = new PreferencesService(db);
+      const result = await service.getEffective('user-1');
+
+      expect(result['agent.thinkingLevel']).toBe('high');
+      expect(result['response.language']).toBe('es');
+    });
+
+    it('ignores user overrides for immutable keys — enforcement always wins', async () => {
+      const db = makeMockDb([
+        { key: 'limits.maxThinkingLevel', value: 'high' },
+        { key: 'limits.rateLimit', value: 9999 },
+      ]);
+
+      const service = new PreferencesService(db);
+      const result = await service.getEffective('user-1');
+
+      // Should still be null (platform default), not the user-supplied values
+      expect(result['limits.maxThinkingLevel']).toBeNull();
+      expect(result['limits.rateLimit']).toBeNull();
+    });
+  });
+
+  describe('set', () => {
+    it('returns error when attempting to override an immutable key', async () => {
+      const db = makeMockDb();
+      const service = new PreferencesService(db);
+
+      const result = await service.set('user-1', 'limits.maxThinkingLevel', 'high');
+      expect(result.success).toBe(false);
+      expect(result.message).toContain('platform enforcement');
+    });
+
+    it('returns error when attempting to override limits.rateLimit', async () => {
+      const db = makeMockDb();
+      const service = new PreferencesService(db);
+
+      const result = await service.set('user-1', 'limits.rateLimit', 100);
+      expect(result.success).toBe(false);
+      expect(result.message).toContain('platform enforcement');
+    });
+
+    it('upserts a mutable preference and returns success — insert path', async () => {
+      // singleRow=[] → no existing row → insert path
+      const db = makeMockDb([], []);
+      const service = new PreferencesService(db);
+      const result = await service.set('user-1', 'agent.thinkingLevel', 'high');
+      expect(result.success).toBe(true);
+      expect(result.message).toContain('"agent.thinkingLevel"');
+    });
+
+    it('upserts a mutable preference and returns success — update path', async () => {
+      // singleRow has an id → existing row → update path
+      const db = makeMockDb([], [{ id: 'existing-id' }]);
+      const service = new PreferencesService(db);
+      const result = await service.set('user-1', 'agent.thinkingLevel', 'low');
+      expect(result.success).toBe(true);
+      expect(result.message).toContain('"agent.thinkingLevel"');
+    });
+  });
+
+  describe('reset', () => {
+    it('returns error when attempting to reset an immutable key', async () => {
+      const db = makeMockDb();
+      const service = new PreferencesService(db);
+
+      const result = await service.reset('user-1', 'limits.rateLimit');
+      expect(result.success).toBe(false);
+      expect(result.message).toContain('platform enforcement');
+    });
+
+    it('deletes user override and returns default value in message', async () => {
+      const db = makeMockDb();
+      const service = new PreferencesService(db);
+      const result = await service.reset('user-1', 'agent.thinkingLevel');
+
+      expect(result.success).toBe(true);
+      expect(result.message).toContain('"auto"'); // platform default for agent.thinkingLevel
+    });
+  });
+
+  describe('IMMUTABLE_KEYS', () => {
+    it('contains only the enforcement keys', () => {
+      expect(IMMUTABLE_KEYS.has('limits.maxThinkingLevel')).toBe(true);
+      expect(IMMUTABLE_KEYS.has('limits.rateLimit')).toBe(true);
+      expect(IMMUTABLE_KEYS.has('agent.thinkingLevel')).toBe(false);
+    });
+  });
+
+  describe('PLATFORM_DEFAULTS', () => {
+    it('has all expected keys', () => {
+      const expectedKeys = [
+        'agent.defaultModel',
+        'agent.thinkingLevel',
+        'agent.streamingEnabled',
+        'response.language',
+        'response.codeAnnotations',
+        'safety.confirmDestructiveTools',
+        'session.autoCompactThreshold',
+        'session.autoCompactEnabled',
+        'limits.maxThinkingLevel',
+        'limits.rateLimit',
+      ];
+      for (const key of expectedKeys) {
+        expect(Object.prototype.hasOwnProperty.call(PLATFORM_DEFAULTS, key)).toBe(true);
+      }
+    });
+  });
+});

apps/gateway/src/preferences/preferences.service.ts

@@ -0,0 +1,119 @@
+import { Inject, Injectable, Logger } from '@nestjs/common';
+import { eq, and, type Db, preferences as preferencesTable } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+
+export const PLATFORM_DEFAULTS: Record<string, unknown> = {
+  'agent.defaultModel': null,
+  'agent.thinkingLevel': 'auto',
+  'agent.streamingEnabled': true,
+  'response.language': 'auto',
+  'response.codeAnnotations': true,
+  'safety.confirmDestructiveTools': true,
+  'session.autoCompactThreshold': 0.8,
+  'session.autoCompactEnabled': true,
+  'limits.maxThinkingLevel': null,
+  'limits.rateLimit': null,
+};
+
+export const IMMUTABLE_KEYS = new Set<string>(['limits.maxThinkingLevel', 'limits.rateLimit']);
+
+@Injectable()
+export class PreferencesService {
+  private readonly logger = new Logger(PreferencesService.name);
+
+  constructor(@Inject(DB) private readonly db: Db) {}
+
+  /**
+   * Returns the effective preference set for a user:
+   * Platform defaults → user overrides (mutable keys only) → enforcements re-applied last
+   */
+  async getEffective(userId: string): Promise<Record<string, unknown>> {
+    const userPrefs = await this.getUserPrefs(userId);
+    const result: Record<string, unknown> = { ...PLATFORM_DEFAULTS };
+
+    for (const [key, value] of Object.entries(userPrefs)) {
+      if (!IMMUTABLE_KEYS.has(key)) {
+        result[key] = value;
+      }
+    }
+
+    // Re-apply immutable keys (enforcements always win)
+    for (const key of IMMUTABLE_KEYS) {
+      result[key] = PLATFORM_DEFAULTS[key];
+    }
+
+    return result;
+  }
+
+  async set(
+    userId: string,
+    key: string,
+    value: unknown,
+  ): Promise<{ success: boolean; message: string }> {
+    if (IMMUTABLE_KEYS.has(key)) {
+      return {
+        success: false,
+        message: `Cannot override "${key}" — this is a platform enforcement. Contact your admin.`,
+      };
+    }
+
+    await this.upsertPref(userId, key, value);
+    return { success: true, message: `Preference "${key}" set to ${JSON.stringify(value)}.` };
+  }
+
+  async reset(userId: string, key: string): Promise<{ success: boolean; message: string }> {
+    if (IMMUTABLE_KEYS.has(key)) {
+      return { success: false, message: `Cannot reset "${key}" — it is a platform enforcement.` };
+    }
+
+    await this.deletePref(userId, key);
+    const defaultVal = PLATFORM_DEFAULTS[key];
+    return {
+      success: true,
+      message: `Preference "${key}" reset to default: ${JSON.stringify(defaultVal)}.`,
+    };
+  }
+
+  private async getUserPrefs(userId: string): Promise<Record<string, unknown>> {
+    const rows = await this.db
+      .select({ key: preferencesTable.key, value: preferencesTable.value })
+      .from(preferencesTable)
+      .where(eq(preferencesTable.userId, userId));
+
+    const result: Record<string, unknown> = {};
+    for (const row of rows) {
+      result[row.key] = row.value;
+    }
+    return result;
+  }
+
+  private async upsertPref(userId: string, key: string, value: unknown): Promise<void> {
+    const existing = await this.db
+      .select({ id: preferencesTable.id })
+      .from(preferencesTable)
+      .where(and(eq(preferencesTable.userId, userId), eq(preferencesTable.key, key)))
+      .limit(1);
+
+    if (existing.length > 0) {
+      await this.db
+        .update(preferencesTable)
+        .set({ value: value as never, updatedAt: new Date() })
+        .where(and(eq(preferencesTable.userId, userId), eq(preferencesTable.key, key)));
+    } else {
+      await this.db.insert(preferencesTable).values({
+        userId,
+        key,
+        value: value as never,
+        mutable: true,
+      });
+    }
+    this.logger.debug(`Upserted preference "${key}" for user ${userId}`);
+  }
+
+  private async deletePref(userId: string, key: string): Promise<void> {
+    await this.db
+      .delete(preferencesTable)
+      .where(and(eq(preferencesTable.userId, userId), eq(preferencesTable.key, key)));
+    this.logger.debug(`Deleted preference "${key}" for user ${userId}`);
+  }
+}

apps/gateway/src/preferences/system-override.service.ts

@@ -0,0 +1,131 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { createQueue, type QueueHandle } from '@mosaic/queue';
+
+const SESSION_SYSTEM_KEY = (sessionId: string) => `mosaic:session:${sessionId}:system`;
+const SESSION_SYSTEM_FRAGMENTS_KEY = (sessionId: string) =>
+  `mosaic:session:${sessionId}:system:fragments`;
+const SYSTEM_OVERRIDE_TTL_SECONDS = 604800; // 7 days
+
+interface OverrideFragment {
+  text: string;
+  addedAt: number;
+}
+
+@Injectable()
+export class SystemOverrideService {
+  private readonly logger = new Logger(SystemOverrideService.name);
+  private readonly handle: QueueHandle;
+
+  constructor() {
+    this.handle = createQueue();
+  }
+
+  async set(sessionId: string, override: string): Promise<void> {
+    // Load existing fragments
+    const existing = await this.handle.redis.get(SESSION_SYSTEM_FRAGMENTS_KEY(sessionId));
+    const fragments: OverrideFragment[] = existing
+      ? (JSON.parse(existing) as OverrideFragment[])
+      : [];
+
+    // Append new fragment
+    fragments.push({ text: override, addedAt: Date.now() });
+
+    // Condense fragments into one coherent override
+    const texts = fragments.map((f) => f.text);
+    const condensed = await this.condenseOverrides(texts);
+
+    // Store both: fragments array and condensed result
+    const pipeline = this.handle.redis.pipeline();
+    pipeline.setex(
+      SESSION_SYSTEM_FRAGMENTS_KEY(sessionId),
+      SYSTEM_OVERRIDE_TTL_SECONDS,
+      JSON.stringify(fragments),
+    );
+    pipeline.setex(SESSION_SYSTEM_KEY(sessionId), SYSTEM_OVERRIDE_TTL_SECONDS, condensed);
+    await pipeline.exec();
+
+    this.logger.debug(
+      `Set system override for session ${sessionId} (${fragments.length} fragment(s), TTL=${SYSTEM_OVERRIDE_TTL_SECONDS}s)`,
+    );
+  }
+
+  async get(sessionId: string): Promise<string | null> {
+    return this.handle.redis.get(SESSION_SYSTEM_KEY(sessionId));
+  }
+
+  async renew(sessionId: string): Promise<void> {
+    const pipeline = this.handle.redis.pipeline();
+    pipeline.expire(SESSION_SYSTEM_KEY(sessionId), SYSTEM_OVERRIDE_TTL_SECONDS);
+    pipeline.expire(SESSION_SYSTEM_FRAGMENTS_KEY(sessionId), SYSTEM_OVERRIDE_TTL_SECONDS);
+    await pipeline.exec();
+  }
+
+  async clear(sessionId: string): Promise<void> {
+    await this.handle.redis.del(
+      SESSION_SYSTEM_KEY(sessionId),
+      SESSION_SYSTEM_FRAGMENTS_KEY(sessionId),
+    );
+    this.logger.debug(`Cleared system override for session ${sessionId}`);
+  }
+
+  /**
+   * Merge an array of override fragments into one coherent string.
+   * If only one fragment exists, returns it as-is.
+   * For multiple fragments, calls Haiku to produce a merged instruction.
+   * Falls back to newline concatenation if the LLM call fails.
+   */
+  async condenseOverrides(fragments: string[]): Promise<string> {
+    if (fragments.length === 0) return '';
+    if (fragments.length === 1) return fragments[0]!;
+
+    const numbered = fragments.map((f, i) => `${i + 1}. ${f}`).join('\n');
+    const prompt =
+      `Merge these system prompt instructions into one coherent paragraph. ` +
+      `If instructions conflict, favor the most recently added (last in the list). ` +
+      `Be concise — output only the merged instruction, nothing else.\n\n` +
+      `Instructions (oldest first):\n${numbered}`;
+
+    const apiKey = process.env['ANTHROPIC_API_KEY'];
+    if (!apiKey) {
+      this.logger.warn('ANTHROPIC_API_KEY not set — falling back to newline concatenation');
+      return fragments.join('\n');
+    }
+
+    try {
+      const response = await fetch('https://api.anthropic.com/v1/messages', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'x-api-key': apiKey,
+          'anthropic-version': '2023-06-01',
+        },
+        body: JSON.stringify({
+          model: 'claude-haiku-4-5-20251001',
+          max_tokens: 1024,
+          messages: [{ role: 'user', content: prompt }],
+        }),
+      });
+
+      if (!response.ok) {
+        const errorText = await response.text();
+        throw new Error(`Anthropic API error ${response.status}: ${errorText}`);
+      }
+
+      const data = (await response.json()) as {
+        content: Array<{ type: string; text: string }>;
+      };
+
+      const textBlock = data.content.find((c) => c.type === 'text');
+      if (!textBlock) {
+        throw new Error('No text block in Anthropic response');
+      }
+
+      return textBlock.text.trim();
+    } catch (err) {
+      this.logger.error(
+        `Condensation LLM call failed — falling back to newline concatenation: ${String(err)}`,
+      );
+      return fragments.join('\n');
+    }
+  }
+}

apps/gateway/src/projects/projects.controller.ts

@@ -2,6 +2,7 @@ import {
   Body,
   Controller,
   Delete,
+  ForbiddenException,
   Get,
   HttpCode,
   HttpStatus,
@@ -16,23 +17,25 @@ import type { Brain } from '@mosaic/brain';
 import { BRAIN } from '../brain/brain.tokens.js';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { CurrentUser } from '../auth/current-user.decorator.js';
-import type { CreateProjectDto, UpdateProjectDto } from './projects.dto.js';
+import { TeamsService } from '../workspace/teams.service.js';
+import { CreateProjectDto, UpdateProjectDto } from './projects.dto.js';
 
 @Controller('api/projects')
 @UseGuards(AuthGuard)
 export class ProjectsController {
-  constructor(@Inject(BRAIN) private readonly brain: Brain) {}
+  constructor(
+    @Inject(BRAIN) private readonly brain: Brain,
+    private readonly teamsService: TeamsService,
+  ) {}
 
   @Get()
-  async list() {
-    return this.brain.projects.findAll();
+  async list(@CurrentUser() user: { id: string }) {
+    return this.brain.projects.findAllForUser(user.id);
   }
 
   @Get(':id')
-  async findOne(@Param('id') id: string) {
-    const project = await this.brain.projects.findById(id);
-    if (!project) throw new NotFoundException('Project not found');
-    return project;
+  async findOne(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    return this.getAccessibleProject(id, user.id);
   }
 
   @Post()
@@ -46,7 +49,12 @@ export class ProjectsController {
   }
 
   @Patch(':id')
-  async update(@Param('id') id: string, @Body() dto: UpdateProjectDto) {
+  async update(
+    @Param('id') id: string,
+    @Body() dto: UpdateProjectDto,
+    @CurrentUser() user: { id: string },
+  ) {
+    await this.getAccessibleProject(id, user.id);
     const project = await this.brain.projects.update(id, dto);
     if (!project) throw new NotFoundException('Project not found');
     return project;
@@ -54,8 +62,22 @@ export class ProjectsController {
 
   @Delete(':id')
   @HttpCode(HttpStatus.NO_CONTENT)
-  async remove(@Param('id') id: string) {
+  async remove(@Param('id') id: string, @CurrentUser() user: { id: string }) {
+    await this.getAccessibleProject(id, user.id);
     const deleted = await this.brain.projects.remove(id);
     if (!deleted) throw new NotFoundException('Project not found');
   }
+
+  /**
+   * Verify the requesting user can access the project — either as the direct
+   * owner or as a member of the owning team.  Throws NotFoundException when the
+   * project does not exist and ForbiddenException when the user lacks access.
+   */
+  private async getAccessibleProject(id: string, userId: string) {
+    const project = await this.brain.projects.findById(id);
+    if (!project) throw new NotFoundException('Project not found');
+    const canAccess = await this.teamsService.canAccessProject(userId, id);
+    if (!canAccess) throw new ForbiddenException('Project does not belong to the current user');
+    return project;
+  }
 }

apps/gateway/src/projects/projects.dto.ts

@@ -1,12 +1,38 @@
-export interface CreateProjectDto {
-  name: string;
+import { IsIn, IsObject, IsOptional, IsString, MaxLength } from 'class-validator';
+
+const projectStatuses = ['active', 'paused', 'completed', 'archived'] as const;
+
+export class CreateProjectDto {
+  @IsString()
+  @MaxLength(255)
+  name!: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
   description?: string;
+
+  @IsOptional()
+  @IsIn(projectStatuses)
   status?: 'active' | 'paused' | 'completed' | 'archived';
 }
 
-export interface UpdateProjectDto {
+export class UpdateProjectDto {
+  @IsOptional()
+  @IsString()
+  @MaxLength(255)
   name?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(10_000)
   description?: string | null;
+
+  @IsOptional()
+  @IsIn(projectStatuses)
   status?: 'active' | 'paused' | 'completed' | 'archived';
+
+  @IsOptional()
+  @IsObject()
   metadata?: Record<string, unknown> | null;
 }

apps/gateway/src/projects/projects.module.ts

@@ -1,7 +1,9 @@
 import { Module } from '@nestjs/common';
 import { ProjectsController } from './projects.controller.js';
+import { WorkspaceModule } from '../workspace/workspace.module.js';
 
 @Module({
+  imports: [WorkspaceModule],
   controllers: [ProjectsController],
 })
 export class ProjectsModule {}

apps/gateway/src/reload/mosaic-plugin.interface.ts

@@ -0,0 +1,20 @@
+export interface MosaicPlugin {
+  /** Called when the plugin is loaded/reloaded */
+  onLoad(): Promise<void>;
+
+  /** Called before the plugin is unloaded during reload */
+  onUnload(): Promise<void>;
+
+  /** Plugin identifier for registry */
+  readonly pluginName: string;
+}
+
+export function isMosaicPlugin(obj: unknown): obj is MosaicPlugin {
+  return (
+    typeof obj === 'object' &&
+    obj !== null &&
+    typeof (obj as MosaicPlugin).onLoad === 'function' &&
+    typeof (obj as MosaicPlugin).onUnload === 'function' &&
+    typeof (obj as MosaicPlugin).pluginName === 'string'
+  );
+}

apps/gateway/src/reload/reload.controller.ts

@@ -0,0 +1,22 @@
+import { Controller, HttpCode, HttpStatus, Inject, Post, UseGuards } from '@nestjs/common';
+import type { SystemReloadPayload } from '@mosaic/types';
+import { AdminGuard } from '../admin/admin.guard.js';
+import { ChatGateway } from '../chat/chat.gateway.js';
+import { ReloadService } from './reload.service.js';
+
+@Controller('api/admin')
+@UseGuards(AdminGuard)
+export class ReloadController {
+  constructor(
+    @Inject(ReloadService) private readonly reloadService: ReloadService,
+    @Inject(ChatGateway) private readonly chatGateway: ChatGateway,
+  ) {}
+
+  @Post('reload')
+  @HttpCode(HttpStatus.OK)
+  async triggerReload(): Promise<SystemReloadPayload> {
+    const result = await this.reloadService.reload('rest');
+    this.chatGateway.broadcastReload(result);
+    return result;
+  }
+}

apps/gateway/src/reload/reload.module.ts

@@ -0,0 +1,14 @@
+import { forwardRef, Module } from '@nestjs/common';
+import { AdminGuard } from '../admin/admin.guard.js';
+import { ChatModule } from '../chat/chat.module.js';
+import { CommandsModule } from '../commands/commands.module.js';
+import { ReloadController } from './reload.controller.js';
+import { ReloadService } from './reload.service.js';
+
+@Module({
+  imports: [forwardRef(() => CommandsModule), forwardRef(() => ChatModule)],
+  controllers: [ReloadController],
+  providers: [ReloadService, AdminGuard],
+  exports: [ReloadService],
+})
+export class ReloadModule {}

apps/gateway/src/reload/reload.service.spec.ts

@@ -0,0 +1,106 @@
+import { describe, expect, it, vi } from 'vitest';
+import { ReloadService } from './reload.service.js';
+
+function createMockCommandRegistry() {
+  return {
+    getManifest: vi.fn().mockReturnValue({
+      version: 1,
+      commands: [],
+      skills: [],
+    }),
+  };
+}
+
+function createService() {
+  const registry = createMockCommandRegistry();
+  const service = new ReloadService(registry as never);
+  return { service, registry };
+}
+
+describe('ReloadService', () => {
+  it('reload() calls onUnload then onLoad for registered MosaicPlugin', async () => {
+    const { service } = createService();
+
+    const callOrder: string[] = [];
+    const mockPlugin = {
+      pluginName: 'test-plugin',
+      onLoad: vi.fn().mockImplementation(() => {
+        callOrder.push('onLoad');
+        return Promise.resolve();
+      }),
+      onUnload: vi.fn().mockImplementation(() => {
+        callOrder.push('onUnload');
+        return Promise.resolve();
+      }),
+    };
+
+    service.registerPlugin('test-plugin', mockPlugin);
+    const result = await service.reload('command');
+
+    expect(mockPlugin.onUnload).toHaveBeenCalledOnce();
+    expect(mockPlugin.onLoad).toHaveBeenCalledOnce();
+    expect(callOrder).toEqual(['onUnload', 'onLoad']);
+    expect(result.message).toContain('test-plugin');
+  });
+
+  it('reload() continues if one plugin throws during onUnload', async () => {
+    const { service } = createService();
+
+    const badPlugin = {
+      pluginName: 'bad-plugin',
+      onLoad: vi.fn().mockResolvedValue(undefined),
+      onUnload: vi.fn().mockRejectedValue(new Error('unload failed')),
+    };
+
+    service.registerPlugin('bad-plugin', badPlugin);
+    const result = await service.reload('command');
+
+    expect(result.message).toContain('bad-plugin');
+    expect(result.message).toContain('unload failed');
+  });
+
+  it('reload() skips non-MosaicPlugin objects', async () => {
+    const { service } = createService();
+
+    const notAPlugin = { foo: 'bar' };
+    service.registerPlugin('not-a-plugin', notAPlugin);
+
+    // Should not throw
+    const result = await service.reload('command');
+    expect(result).toBeDefined();
+    expect(result.message).not.toContain('not-a-plugin');
+  });
+
+  it('reload() returns SystemReloadPayload with commands, skills, providers, message', async () => {
+    const { service, registry } = createService();
+    registry.getManifest.mockReturnValue({
+      version: 1,
+      commands: [
+        {
+          name: 'test',
+          description: 'test cmd',
+          aliases: [],
+          scope: 'core',
+          execution: 'socket',
+          available: true,
+        },
+      ],
+      skills: [],
+    });
+
+    const result = await service.reload('rest');
+
+    expect(result).toHaveProperty('commands');
+    expect(result).toHaveProperty('skills');
+    expect(result).toHaveProperty('providers');
+    expect(result).toHaveProperty('message');
+    expect(result.commands).toHaveLength(1);
+  });
+
+  it('registerPlugin() logs plugin registration', () => {
+    const { service } = createService();
+
+    // Should not throw and should register
+    expect(() => service.registerPlugin('my-plugin', {})).not.toThrow();
+  });
+});

apps/gateway/src/reload/reload.service.ts

@@ -0,0 +1,92 @@
+import {
+  Inject,
+  Injectable,
+  Logger,
+  type OnApplicationBootstrap,
+  type OnApplicationShutdown,
+} from '@nestjs/common';
+import type { SystemReloadPayload } from '@mosaic/types';
+import { CommandRegistryService } from '../commands/command-registry.service.js';
+import { isMosaicPlugin } from './mosaic-plugin.interface.js';
+
+@Injectable()
+export class ReloadService implements OnApplicationBootstrap, OnApplicationShutdown {
+  private readonly logger = new Logger(ReloadService.name);
+  private readonly plugins: Map<string, unknown> = new Map();
+  private shutdownHandlerAttached = false;
+
+  constructor(
+    @Inject(CommandRegistryService) private readonly commandRegistry: CommandRegistryService,
+  ) {}
+
+  onApplicationBootstrap(): void {
+    if (!this.shutdownHandlerAttached) {
+      process.on('SIGHUP', () => {
+        this.logger.log('SIGHUP received — triggering soft reload');
+        this.reload('sighup').catch((err: unknown) => {
+          this.logger.error(`SIGHUP reload failed: ${err}`);
+        });
+      });
+      this.shutdownHandlerAttached = true;
+    }
+  }
+
+  onApplicationShutdown(): void {
+    process.removeAllListeners('SIGHUP');
+  }
+
+  registerPlugin(name: string, plugin: unknown): void {
+    this.plugins.set(name, plugin);
+    this.logger.log(`Plugin registered: ${name}`);
+  }
+
+  /**
+   * Soft reload — unload plugins, reload plugins, broadcast.
+   * Does NOT restart the HTTP server or drop connections.
+   */
+  async reload(
+    trigger: 'command' | 'rest' | 'sighup' | 'file-watch',
+  ): Promise<SystemReloadPayload> {
+    this.logger.log(`Soft reload triggered by: ${trigger}`);
+    const reloaded: string[] = [];
+    const errors: string[] = [];
+
+    // 1. Unload all registered MosaicPlugin instances
+    for (const [name, plugin] of this.plugins) {
+      if (isMosaicPlugin(plugin)) {
+        try {
+          await plugin.onUnload();
+          reloaded.push(name);
+        } catch (err) {
+          errors.push(`${name}: unload failed — ${err}`);
+        }
+      }
+    }
+
+    // 2. Reload all MosaicPlugin instances
+    for (const [name, plugin] of this.plugins) {
+      if (isMosaicPlugin(plugin)) {
+        try {
+          await plugin.onLoad();
+        } catch (err) {
+          errors.push(`${name}: load failed — ${err}`);
+        }
+      }
+    }
+
+    const manifest = this.commandRegistry.getManifest();
+
+    const errorSuffix = errors.length > 0 ? ` Errors: ${errors.join(', ')}` : '';
+    const payload: SystemReloadPayload = {
+      commands: manifest.commands,
+      skills: manifest.skills,
+      providers: [],
+      message: `Reload complete (trigger=${trigger}). Plugins reloaded: [${reloaded.join(', ')}].${errorSuffix}`,
+    };
+
+    this.logger.log(
+      `Reload complete. Reloaded: [${reloaded.join(', ')}]. Errors: ${errors.length}`,
+    );
+    return payload;
+  }
+}

apps/gateway/src/skills/skills.controller.ts

@@ -0,0 +1,68 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Inject,
+  NotFoundException,
+  Param,
+  Patch,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import { SkillsService } from './skills.service.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import type { CreateSkillDto, UpdateSkillDto } from './skills.dto.js';
+
+@Controller('api/skills')
+@UseGuards(AuthGuard)
+export class SkillsController {
+  constructor(@Inject(SkillsService) private readonly skills: SkillsService) {}
+
+  @Get()
+  async list() {
+    return this.skills.findAll();
+  }
+
+  @Get(':id')
+  async findOne(@Param('id') id: string) {
+    const skill = await this.skills.findById(id);
+    if (!skill) throw new NotFoundException('Skill not found');
+    return skill;
+  }
+
+  @Post()
+  async create(@Body() dto: CreateSkillDto) {
+    return this.skills.create({
+      name: dto.name,
+      description: dto.description,
+      version: dto.version,
+      source: dto.source,
+      config: dto.config,
+      enabled: dto.enabled,
+    });
+  }
+
+  @Patch(':id')
+  async update(@Param('id') id: string, @Body() dto: UpdateSkillDto) {
+    const skill = await this.skills.update(id, dto);
+    if (!skill) throw new NotFoundException('Skill not found');
+    return skill;
+  }
+
+  @Patch(':id/toggle')
+  async toggle(@Param('id') id: string, @Body() body: { enabled: boolean }) {
+    const skill = await this.skills.toggle(id, body.enabled);
+    if (!skill) throw new NotFoundException('Skill not found');
+    return skill;
+  }
+
+  @Delete(':id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async remove(@Param('id') id: string) {
+    const deleted = await this.skills.remove(id);
+    if (!deleted) throw new NotFoundException('Skill not found');
+  }
+}

apps/gateway/src/skills/skills.dto.ts

@@ -0,0 +1,15 @@
+export interface CreateSkillDto {
+  name: string;
+  description?: string;
+  version?: string;
+  source?: 'builtin' | 'community' | 'custom';
+  config?: Record<string, unknown>;
+  enabled?: boolean;
+}
+
+export interface UpdateSkillDto {
+  description?: string;
+  version?: string;
+  config?: Record<string, unknown>;
+  enabled?: boolean;
+}

apps/gateway/src/skills/skills.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { SkillsService } from './skills.service.js';
+import { SkillsController } from './skills.controller.js';
+
+@Module({
+  providers: [SkillsService],
+  controllers: [SkillsController],
+  exports: [SkillsService],
+})
+export class SkillsModule {}

apps/gateway/src/skills/skills.service.ts

@@ -0,0 +1,52 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { eq, type Db, skills } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+
+type Skill = typeof skills.$inferSelect;
+type NewSkill = typeof skills.$inferInsert;
+
+@Injectable()
+export class SkillsService {
+  constructor(@Inject(DB) private readonly db: Db) {}
+
+  async findAll(): Promise<Skill[]> {
+    return this.db.select().from(skills);
+  }
+
+  async findEnabled(): Promise<Skill[]> {
+    return this.db.select().from(skills).where(eq(skills.enabled, true));
+  }
+
+  async findById(id: string): Promise<Skill | undefined> {
+    const rows = await this.db.select().from(skills).where(eq(skills.id, id));
+    return rows[0];
+  }
+
+  async findByName(name: string): Promise<Skill | undefined> {
+    const rows = await this.db.select().from(skills).where(eq(skills.name, name));
+    return rows[0];
+  }
+
+  async create(data: NewSkill): Promise<Skill> {
+    const rows = await this.db.insert(skills).values(data).returning();
+    return rows[0]!;
+  }
+
+  async update(id: string, data: Partial<NewSkill>): Promise<Skill | undefined> {
+    const rows = await this.db
+      .update(skills)
+      .set({ ...data, updatedAt: new Date() })
+      .where(eq(skills.id, id))
+      .returning();
+    return rows[0];
+  }
+
+  async remove(id: string): Promise<boolean> {
+    const rows = await this.db.delete(skills).where(eq(skills.id, id)).returning();
+    return rows.length > 0;
+  }
+
+  async toggle(id: string, enabled: boolean): Promise<Skill | undefined> {
+    return this.update(id, { enabled });
+  }
+}