feat(config): add MosaicConfig schema + loader with tier auto-detection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/gateway/package.json

@@ -19,6 +19,7 @@
     "@modelcontextprotocol/sdk": "^1.27.1",
     "@mosaic/auth": "workspace:^",
     "@mosaic/brain": "workspace:^",
+    "@mosaic/config": "workspace:^",
     "@mosaic/coord": "workspace:^",
     "@mosaic/db": "workspace:^",
     "@mosaic/discord-plugin": "workspace:^",

apps/gateway/src/app.module.ts

@@ -1,6 +1,7 @@
 import { Module } from '@nestjs/common';
 import { APP_GUARD } from '@nestjs/core';
 import { HealthController } from './health/health.controller.js';
+import { ConfigModule } from './config/config.module.js';
 import { DatabaseModule } from './database/database.module.js';
 import { AuthModule } from './auth/auth.module.js';
 import { BrainModule } from './brain/brain.module.js';
@@ -28,6 +29,7 @@ import { ThrottlerGuard, ThrottlerModule } from '@nestjs/throttler';
 @Module({
   imports: [
     ThrottlerModule.forRoot([{ name: 'default', ttl: 60_000, limit: 60 }]),
+    ConfigModule,
     DatabaseModule,
     AuthModule,
     BrainModule,

apps/gateway/src/config/config.module.ts

@@ -0,0 +1,16 @@
+import { Global, Module } from '@nestjs/common';
+import { loadConfig, type MosaicConfig } from '@mosaic/config';
+
+export const MOSAIC_CONFIG = 'MOSAIC_CONFIG';
+
+@Global()
+@Module({
+  providers: [
+    {
+      provide: MOSAIC_CONFIG,
+      useFactory: (): MosaicConfig => loadConfig(),
+    },
+  ],
+  exports: [MOSAIC_CONFIG],
+})
+export class ConfigModule {}

apps/gateway/src/database/database.module.ts

@@ -1,19 +1,21 @@
 import { Global, Inject, Module, type OnApplicationShutdown } from '@nestjs/common';
 import { createDb, type Db, type DbHandle } from '@mosaic/db';
 import { createStorageAdapter, type StorageAdapter } from '@mosaic/storage';
+import type { MosaicConfig } from '@mosaic/config';
+import { MOSAIC_CONFIG } from '../config/config.module.js';
 
 export const DB_HANDLE = 'DB_HANDLE';
 export const DB = 'DB';
 export const STORAGE_ADAPTER = 'STORAGE_ADAPTER';
 
-const DEFAULT_DATABASE_URL = 'postgresql://mosaic:mosaic@localhost:5432/mosaic';
-
 @Global()
 @Module({
   providers: [
     {
       provide: DB_HANDLE,
-      useFactory: (): DbHandle => createDb(),
+      useFactory: (config: MosaicConfig): DbHandle =>
+        createDb(config.storage.type === 'postgres' ? config.storage.url : undefined),
+      inject: [MOSAIC_CONFIG],
     },
     {
       provide: DB,
@@ -22,11 +24,8 @@ const DEFAULT_DATABASE_URL = 'postgresql://mosaic:mosaic@localhost:5432/mosaic';
     },
     {
       provide: STORAGE_ADAPTER,
-      useFactory: (): StorageAdapter =>
+      useFactory: (config: MosaicConfig): StorageAdapter => createStorageAdapter(config.storage),
-        createStorageAdapter({
+      inject: [MOSAIC_CONFIG],
-          type: 'postgres',
-          url: process.env['DATABASE_URL'] ?? DEFAULT_DATABASE_URL,
-        }),
     },
   ],
   exports: [DB, STORAGE_ADAPTER],

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

@@ -1,13 +1,29 @@
 import { Global, Module } from '@nestjs/common';
-import { createMemory, type Memory, createMemoryAdapter, type MemoryAdapter } from '@mosaic/memory';
+import {
+  createMemory,
+  type Memory,
+  createMemoryAdapter,
+  type MemoryAdapter,
+  type MemoryConfig,
+} from '@mosaic/memory';
 import type { Db } from '@mosaic/db';
-import { DB } from '../database/database.module.js';
+import type { StorageAdapter } from '@mosaic/storage';
+import type { MosaicConfig } from '@mosaic/config';
+import { MOSAIC_CONFIG } from '../config/config.module.js';
+import { DB, STORAGE_ADAPTER } from '../database/database.module.js';
 import { MEMORY } from './memory.tokens.js';
 import { MemoryController } from './memory.controller.js';
 import { EmbeddingService } from './embedding.service.js';
 
 export const MEMORY_ADAPTER = 'MEMORY_ADAPTER';
 
+function buildMemoryConfig(config: MosaicConfig, storageAdapter: StorageAdapter): MemoryConfig {
+  if (config.memory.type === 'keyword') {
+    return { type: 'keyword', storage: storageAdapter };
+  }
+  return { type: config.memory.type };
+}
+
 @Global()
 @Module({
   providers: [
@@ -18,7 +34,9 @@ export const MEMORY_ADAPTER = 'MEMORY_ADAPTER';
     },
     {
       provide: MEMORY_ADAPTER,
-      useFactory: (): MemoryAdapter => createMemoryAdapter({ type: 'pgvector' }),
+      useFactory: (config: MosaicConfig, storageAdapter: StorageAdapter): MemoryAdapter =>
+        createMemoryAdapter(buildMemoryConfig(config, storageAdapter)),
+      inject: [MOSAIC_CONFIG, STORAGE_ADAPTER],
     },
     EmbeddingService,
   ],

apps/gateway/src/queue/queue.module.ts

@@ -1,5 +1,7 @@
 import { Global, Module } from '@nestjs/common';
 import { createQueueAdapter, type QueueAdapter } from '@mosaic/queue';
+import type { MosaicConfig } from '@mosaic/config';
+import { MOSAIC_CONFIG } from '../config/config.module.js';
 import { QueueService } from './queue.service.js';
 
 export const QUEUE_ADAPTER = 'QUEUE_ADAPTER';
@@ -10,11 +12,8 @@ export const QUEUE_ADAPTER = 'QUEUE_ADAPTER';
     QueueService,
     {
       provide: QUEUE_ADAPTER,
-      useFactory: (): QueueAdapter =>
+      useFactory: (config: MosaicConfig): QueueAdapter => createQueueAdapter(config.queue),
-        createQueueAdapter({
+      inject: [MOSAIC_CONFIG],
-          type: 'bullmq',
-          url: process.env['VALKEY_URL'],
-        }),
     },
   ],
   exports: [QueueService, QUEUE_ADAPTER],

mosaic.config.json

@@ -0,0 +1,6 @@
+{
+  "tier": "local",
+  "storage": { "type": "sqlite", "path": ".mosaic/data.db" },
+  "queue": { "type": "local", "dataDir": ".mosaic/queue" },
+  "memory": { "type": "keyword" }
+}

packages/config/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@mosaic/config",
+  "version": "0.0.1",
+  "type": "module",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint src",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run --passWithNoTests"
+  },
+  "dependencies": {
+    "@mosaic/memory": "workspace:^",
+    "@mosaic/queue": "workspace:^",
+    "@mosaic/storage": "workspace:^"
+  },
+  "devDependencies": {
+    "typescript": "^5.8.0",
+    "vitest": "^2.0.0"
+  },
+  "publishConfig": {
+    "registry": "https://git.mosaicstack.dev/api/packages/mosaic/npm/",
+    "access": "public"
+  },
+  "files": [
+    "dist"
+  ]
+}

packages/config/src/index.ts

@@ -0,0 +1,7 @@
+export type { MosaicConfig, StorageTier, MemoryConfigRef } from './mosaic-config.js';
+export {
+  DEFAULT_LOCAL_CONFIG,
+  DEFAULT_TEAM_CONFIG,
+  loadConfig,
+  validateConfig,
+} from './mosaic-config.js';

packages/config/src/mosaic-config.ts

@@ -0,0 +1,140 @@
+import { readFileSync, existsSync } from 'node:fs';
+import { resolve } from 'node:path';
+import type { StorageConfig } from '@mosaic/storage';
+import type { QueueAdapterConfig as QueueConfig } from '@mosaic/queue';
+
+/* ------------------------------------------------------------------ */
+/*  Types                                                              */
+/* ------------------------------------------------------------------ */
+
+export type StorageTier = 'local' | 'team';
+
+export interface MemoryConfigRef {
+  type: 'pgvector' | 'sqlite-vec' | 'keyword';
+}
+
+export interface MosaicConfig {
+  tier: StorageTier;
+  storage: StorageConfig;
+  queue: QueueConfig;
+  memory: MemoryConfigRef;
+}
+
+/* ------------------------------------------------------------------ */
+/*  Defaults                                                           */
+/* ------------------------------------------------------------------ */
+
+export const DEFAULT_LOCAL_CONFIG: MosaicConfig = {
+  tier: 'local',
+  storage: { type: 'sqlite', path: '.mosaic/data.db' },
+  queue: { type: 'local', dataDir: '.mosaic/queue' },
+  memory: { type: 'keyword' },
+};
+
+export const DEFAULT_TEAM_CONFIG: MosaicConfig = {
+  tier: 'team',
+  storage: { type: 'postgres', url: 'postgresql://mosaic:mosaic@localhost:5432/mosaic' },
+  queue: { type: 'bullmq' },
+  memory: { type: 'pgvector' },
+};
+
+/* ------------------------------------------------------------------ */
+/*  Validation                                                         */
+/* ------------------------------------------------------------------ */
+
+const VALID_TIERS = new Set<string>(['local', 'team']);
+const VALID_STORAGE_TYPES = new Set<string>(['postgres', 'sqlite', 'files']);
+const VALID_QUEUE_TYPES = new Set<string>(['bullmq', 'local']);
+const VALID_MEMORY_TYPES = new Set<string>(['pgvector', 'sqlite-vec', 'keyword']);
+
+export function validateConfig(raw: unknown): MosaicConfig {
+  if (typeof raw !== 'object' || raw === null) {
+    throw new Error('MosaicConfig must be a non-null object');
+  }
+
+  const obj = raw as Record<string, unknown>;
+
+  // tier
+  const tier = obj['tier'];
+  if (typeof tier !== 'string' || !VALID_TIERS.has(tier)) {
+    throw new Error(`Invalid tier "${String(tier)}" — expected "local" or "team"`);
+  }
+
+  // storage
+  const storage = obj['storage'];
+  if (typeof storage !== 'object' || storage === null) {
+    throw new Error('config.storage must be a non-null object');
+  }
+  const storageType = (storage as Record<string, unknown>)['type'];
+  if (typeof storageType !== 'string' || !VALID_STORAGE_TYPES.has(storageType)) {
+    throw new Error(`Invalid storage.type "${String(storageType)}"`);
+  }
+
+  // queue
+  const queue = obj['queue'];
+  if (typeof queue !== 'object' || queue === null) {
+    throw new Error('config.queue must be a non-null object');
+  }
+  const queueType = (queue as Record<string, unknown>)['type'];
+  if (typeof queueType !== 'string' || !VALID_QUEUE_TYPES.has(queueType)) {
+    throw new Error(`Invalid queue.type "${String(queueType)}"`);
+  }
+
+  // memory
+  const memory = obj['memory'];
+  if (typeof memory !== 'object' || memory === null) {
+    throw new Error('config.memory must be a non-null object');
+  }
+  const memoryType = (memory as Record<string, unknown>)['type'];
+  if (typeof memoryType !== 'string' || !VALID_MEMORY_TYPES.has(memoryType)) {
+    throw new Error(`Invalid memory.type "${String(memoryType)}"`);
+  }
+
+  return {
+    tier: tier as StorageTier,
+    storage: storage as StorageConfig,
+    queue: queue as QueueConfig,
+    memory: memory as MemoryConfigRef,
+  };
+}
+
+/* ------------------------------------------------------------------ */
+/*  Loader                                                             */
+/* ------------------------------------------------------------------ */
+
+function detectFromEnv(): MosaicConfig {
+  if (process.env['DATABASE_URL']) {
+    return {
+      ...DEFAULT_TEAM_CONFIG,
+      storage: {
+        type: 'postgres',
+        url: process.env['DATABASE_URL'],
+      },
+      queue: {
+        type: 'bullmq',
+        url: process.env['VALKEY_URL'],
+      },
+    };
+  }
+  return DEFAULT_LOCAL_CONFIG;
+}
+
+export function loadConfig(configPath?: string): MosaicConfig {
+  // 1. Explicit path or default location
+  const paths = configPath
+    ? [resolve(configPath)]
+    : [
+        resolve(process.cwd(), 'mosaic.config.json'),
+        resolve(process.cwd(), '../../mosaic.config.json'), // monorepo root when cwd is apps/gateway
+      ];
+
+  for (const p of paths) {
+    if (existsSync(p)) {
+      const raw: unknown = JSON.parse(readFileSync(p, 'utf-8'));
+      return validateConfig(raw);
+    }
+  }
+
+  // 2. Fall back to env-var detection
+  return detectFromEnv();
+}

packages/config/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}

pnpm-lock.yaml

@@ -62,6 +62,9 @@ importers:
       '@mosaic/brain':
         specifier: workspace:^
         version: link:../../packages/brain
+      '@mosaic/config':
+        specifier: workspace:^
+        version: link:../../packages/config
       '@mosaic/coord':
         specifier: workspace:^
         version: link:../../packages/coord
@@ -351,6 +354,25 @@ importers:
         specifier: ^2.0.0
         version: 2.1.9(@types/node@22.19.15)(jsdom@29.0.0(@noble/hashes@2.0.1))(lightningcss@1.31.1)
 
+  packages/config:
+    dependencies:
+      '@mosaic/memory':
+        specifier: workspace:^
+        version: link:../memory
+      '@mosaic/queue':
+        specifier: workspace:^
+        version: link:../queue
+      '@mosaic/storage':
+        specifier: workspace:^
+        version: link:../storage
+    devDependencies:
+      typescript:
+        specifier: ^5.8.0
+        version: 5.9.3
+      vitest:
+        specifier: ^2.0.0
+        version: 2.1.9(@types/node@24.12.0)(jsdom@29.0.0(@noble/hashes@2.0.1))(lightningcss@1.31.1)
+
   packages/coord:
     dependencies:
       '@mosaic/types':