test(web): add Mission Control phase 2 test suite

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

apps/orchestrator/src/agent-ingestion/agent-ingestion.service.ts

@@ -25,14 +25,14 @@ export class AgentIngestionService {
       where: { sessionId: agentId },
       create: {
         sessionId: agentId,
-        parentSessionId: parentAgentId,
+        parentSessionId: parentAgentId ?? null,
         missionId,
         taskId,
         agentType,
         status: "spawning",
       },
       update: {
-        parentSessionId: parentAgentId,
+        parentSessionId: parentAgentId ?? null,
         missionId,
         taskId,
         agentType,

apps/orchestrator/src/api/agent-providers/agent-providers.controller.ts

@@ -0,0 +1,54 @@
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  Param,
+  Patch,
+  Post,
+  UseGuards,
+  UsePipes,
+  ValidationPipe,
+} from "@nestjs/common";
+import type { AgentProviderConfig } from "@prisma/client";
+import { OrchestratorApiKeyGuard } from "../../common/guards/api-key.guard";
+import { OrchestratorThrottlerGuard } from "../../common/guards/throttler.guard";
+import { AgentProvidersService } from "./agent-providers.service";
+import { CreateAgentProviderDto } from "./dto/create-agent-provider.dto";
+import { UpdateAgentProviderDto } from "./dto/update-agent-provider.dto";
+
+@Controller("agent-providers")
+@UseGuards(OrchestratorApiKeyGuard, OrchestratorThrottlerGuard)
+export class AgentProvidersController {
+  constructor(private readonly agentProvidersService: AgentProvidersService) {}
+
+  @Get()
+  async list(): Promise<AgentProviderConfig[]> {
+    return this.agentProvidersService.list();
+  }
+
+  @Get(":id")
+  async getById(@Param("id") id: string): Promise<AgentProviderConfig> {
+    return this.agentProvidersService.getById(id);
+  }
+
+  @Post()
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async create(@Body() dto: CreateAgentProviderDto): Promise<AgentProviderConfig> {
+    return this.agentProvidersService.create(dto);
+  }
+
+  @Patch(":id")
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async update(
+    @Param("id") id: string,
+    @Body() dto: UpdateAgentProviderDto
+  ): Promise<AgentProviderConfig> {
+    return this.agentProvidersService.update(id, dto);
+  }
+
+  @Delete(":id")
+  async delete(@Param("id") id: string): Promise<AgentProviderConfig> {
+    return this.agentProvidersService.delete(id);
+  }
+}

apps/orchestrator/src/api/agent-providers/agent-providers.module.ts

@@ -0,0 +1,12 @@
+import { Module } from "@nestjs/common";
+import { PrismaModule } from "../../prisma/prisma.module";
+import { OrchestratorApiKeyGuard } from "../../common/guards/api-key.guard";
+import { AgentProvidersController } from "./agent-providers.controller";
+import { AgentProvidersService } from "./agent-providers.service";
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [AgentProvidersController],
+  providers: [OrchestratorApiKeyGuard, AgentProvidersService],
+})
+export class AgentProvidersModule {}

apps/orchestrator/src/api/agent-providers/agent-providers.service.spec.ts

@@ -0,0 +1,211 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { NotFoundException } from "@nestjs/common";
+import { AgentProvidersService } from "./agent-providers.service";
+import { PrismaService } from "../../prisma/prisma.service";
+
+describe("AgentProvidersService", () => {
+  let service: AgentProvidersService;
+  let prisma: {
+    agentProviderConfig: {
+      findMany: ReturnType<typeof vi.fn>;
+      findUnique: ReturnType<typeof vi.fn>;
+      create: ReturnType<typeof vi.fn>;
+      update: ReturnType<typeof vi.fn>;
+      delete: ReturnType<typeof vi.fn>;
+    };
+  };
+
+  beforeEach(() => {
+    prisma = {
+      agentProviderConfig: {
+        findMany: vi.fn(),
+        findUnique: vi.fn(),
+        create: vi.fn(),
+        update: vi.fn(),
+        delete: vi.fn(),
+      },
+    };
+
+    service = new AgentProvidersService(prisma as unknown as PrismaService);
+  });
+
+  it("lists all provider configs", async () => {
+    const expected = [
+      {
+        id: "cfg-1",
+        workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+        name: "Primary",
+        provider: "openai",
+        gatewayUrl: "https://gateway.example.com",
+        credentials: {},
+        isActive: true,
+        createdAt: new Date("2026-03-07T18:00:00.000Z"),
+        updatedAt: new Date("2026-03-07T18:00:00.000Z"),
+      },
+    ];
+    prisma.agentProviderConfig.findMany.mockResolvedValue(expected);
+
+    const result = await service.list();
+
+    expect(prisma.agentProviderConfig.findMany).toHaveBeenCalledWith({
+      orderBy: [{ createdAt: "desc" }, { id: "desc" }],
+    });
+    expect(result).toEqual(expected);
+  });
+
+  it("returns a single provider config", async () => {
+    const expected = {
+      id: "cfg-1",
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "Primary",
+      provider: "openai",
+      gatewayUrl: "https://gateway.example.com",
+      credentials: { apiKeyRef: "vault:openai" },
+      isActive: true,
+      createdAt: new Date("2026-03-07T18:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T18:00:00.000Z"),
+    };
+    prisma.agentProviderConfig.findUnique.mockResolvedValue(expected);
+
+    const result = await service.getById("cfg-1");
+
+    expect(prisma.agentProviderConfig.findUnique).toHaveBeenCalledWith({
+      where: { id: "cfg-1" },
+    });
+    expect(result).toEqual(expected);
+  });
+
+  it("throws NotFoundException when provider config is missing", async () => {
+    prisma.agentProviderConfig.findUnique.mockResolvedValue(null);
+
+    await expect(service.getById("missing")).rejects.toBeInstanceOf(NotFoundException);
+  });
+
+  it("creates a provider config with default credentials", async () => {
+    const created = {
+      id: "cfg-created",
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "New Provider",
+      provider: "claude",
+      gatewayUrl: "https://gateway.example.com",
+      credentials: {},
+      isActive: true,
+      createdAt: new Date("2026-03-07T18:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T18:00:00.000Z"),
+    };
+    prisma.agentProviderConfig.create.mockResolvedValue(created);
+
+    const result = await service.create({
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "New Provider",
+      provider: "claude",
+      gatewayUrl: "https://gateway.example.com",
+    });
+
+    expect(prisma.agentProviderConfig.create).toHaveBeenCalledWith({
+      data: {
+        workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+        name: "New Provider",
+        provider: "claude",
+        gatewayUrl: "https://gateway.example.com",
+        credentials: {},
+      },
+    });
+    expect(result).toEqual(created);
+  });
+
+  it("updates a provider config", async () => {
+    prisma.agentProviderConfig.findUnique.mockResolvedValue({
+      id: "cfg-1",
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "Primary",
+      provider: "openai",
+      gatewayUrl: "https://gateway.example.com",
+      credentials: {},
+      isActive: true,
+      createdAt: new Date("2026-03-07T18:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T18:00:00.000Z"),
+    });
+
+    const updated = {
+      id: "cfg-1",
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "Secondary",
+      provider: "openai",
+      gatewayUrl: "https://gateway2.example.com",
+      credentials: { apiKeyRef: "vault:new" },
+      isActive: false,
+      createdAt: new Date("2026-03-07T18:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T19:00:00.000Z"),
+    };
+    prisma.agentProviderConfig.update.mockResolvedValue(updated);
+
+    const result = await service.update("cfg-1", {
+      name: "Secondary",
+      gatewayUrl: "https://gateway2.example.com",
+      credentials: { apiKeyRef: "vault:new" },
+      isActive: false,
+    });
+
+    expect(prisma.agentProviderConfig.update).toHaveBeenCalledWith({
+      where: { id: "cfg-1" },
+      data: {
+        name: "Secondary",
+        gatewayUrl: "https://gateway2.example.com",
+        credentials: { apiKeyRef: "vault:new" },
+        isActive: false,
+      },
+    });
+    expect(result).toEqual(updated);
+  });
+
+  it("throws NotFoundException when updating a missing provider config", async () => {
+    prisma.agentProviderConfig.findUnique.mockResolvedValue(null);
+
+    await expect(service.update("missing", { name: "Updated" })).rejects.toBeInstanceOf(
+      NotFoundException
+    );
+    expect(prisma.agentProviderConfig.update).not.toHaveBeenCalled();
+  });
+
+  it("deletes a provider config", async () => {
+    prisma.agentProviderConfig.findUnique.mockResolvedValue({
+      id: "cfg-1",
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "Primary",
+      provider: "openai",
+      gatewayUrl: "https://gateway.example.com",
+      credentials: {},
+      isActive: true,
+      createdAt: new Date("2026-03-07T18:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T18:00:00.000Z"),
+    });
+
+    const deleted = {
+      id: "cfg-1",
+      workspaceId: "8bcd7eda-a122-4d6c-adfd-b152f6f75369",
+      name: "Primary",
+      provider: "openai",
+      gatewayUrl: "https://gateway.example.com",
+      credentials: {},
+      isActive: true,
+      createdAt: new Date("2026-03-07T18:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T18:00:00.000Z"),
+    };
+    prisma.agentProviderConfig.delete.mockResolvedValue(deleted);
+
+    const result = await service.delete("cfg-1");
+
+    expect(prisma.agentProviderConfig.delete).toHaveBeenCalledWith({
+      where: { id: "cfg-1" },
+    });
+    expect(result).toEqual(deleted);
+  });
+
+  it("throws NotFoundException when deleting a missing provider config", async () => {
+    prisma.agentProviderConfig.findUnique.mockResolvedValue(null);
+
+    await expect(service.delete("missing")).rejects.toBeInstanceOf(NotFoundException);
+    expect(prisma.agentProviderConfig.delete).not.toHaveBeenCalled();
+  });
+});

apps/orchestrator/src/api/agent-providers/agent-providers.service.ts

@@ -0,0 +1,71 @@
+import { Injectable, NotFoundException } from "@nestjs/common";
+import type { AgentProviderConfig, Prisma } from "@prisma/client";
+import { PrismaService } from "../../prisma/prisma.service";
+import { CreateAgentProviderDto } from "./dto/create-agent-provider.dto";
+import { UpdateAgentProviderDto } from "./dto/update-agent-provider.dto";
+
+@Injectable()
+export class AgentProvidersService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async list(): Promise<AgentProviderConfig[]> {
+    return this.prisma.agentProviderConfig.findMany({
+      orderBy: [{ createdAt: "desc" }, { id: "desc" }],
+    });
+  }
+
+  async getById(id: string): Promise<AgentProviderConfig> {
+    const providerConfig = await this.prisma.agentProviderConfig.findUnique({
+      where: { id },
+    });
+
+    if (!providerConfig) {
+      throw new NotFoundException(`Agent provider config with id ${id} not found`);
+    }
+
+    return providerConfig;
+  }
+
+  async create(dto: CreateAgentProviderDto): Promise<AgentProviderConfig> {
+    return this.prisma.agentProviderConfig.create({
+      data: {
+        workspaceId: dto.workspaceId,
+        name: dto.name,
+        provider: dto.provider,
+        gatewayUrl: dto.gatewayUrl,
+        credentials: this.toJsonValue(dto.credentials ?? {}),
+        ...(dto.isActive !== undefined ? { isActive: dto.isActive } : {}),
+      },
+    });
+  }
+
+  async update(id: string, dto: UpdateAgentProviderDto): Promise<AgentProviderConfig> {
+    await this.getById(id);
+
+    const data: Prisma.AgentProviderConfigUpdateInput = {
+      ...(dto.workspaceId !== undefined ? { workspaceId: dto.workspaceId } : {}),
+      ...(dto.name !== undefined ? { name: dto.name } : {}),
+      ...(dto.provider !== undefined ? { provider: dto.provider } : {}),
+      ...(dto.gatewayUrl !== undefined ? { gatewayUrl: dto.gatewayUrl } : {}),
+      ...(dto.isActive !== undefined ? { isActive: dto.isActive } : {}),
+      ...(dto.credentials !== undefined ? { credentials: this.toJsonValue(dto.credentials) } : {}),
+    };
+
+    return this.prisma.agentProviderConfig.update({
+      where: { id },
+      data,
+    });
+  }
+
+  async delete(id: string): Promise<AgentProviderConfig> {
+    await this.getById(id);
+
+    return this.prisma.agentProviderConfig.delete({
+      where: { id },
+    });
+  }
+
+  private toJsonValue(value: Record<string, unknown>): Prisma.InputJsonValue {
+    return value as Prisma.InputJsonValue;
+  }
+}

apps/orchestrator/src/api/agent-providers/dto/create-agent-provider.dto.ts

@@ -0,0 +1,26 @@
+import { IsBoolean, IsNotEmpty, IsObject, IsOptional, IsString, IsUUID } from "class-validator";
+
+export class CreateAgentProviderDto {
+  @IsUUID()
+  workspaceId!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  name!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  provider!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  gatewayUrl!: string;
+
+  @IsOptional()
+  @IsObject()
+  credentials?: Record<string, unknown>;
+
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}

apps/orchestrator/src/api/agent-providers/dto/update-agent-provider.dto.ts

@@ -0,0 +1,30 @@
+import { IsBoolean, IsNotEmpty, IsObject, IsOptional, IsString, IsUUID } from "class-validator";
+
+export class UpdateAgentProviderDto {
+  @IsOptional()
+  @IsUUID()
+  workspaceId?: string;
+
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  provider?: string;
+
+  @IsOptional()
+  @IsString()
+  @IsNotEmpty()
+  gatewayUrl?: string;
+
+  @IsOptional()
+  @IsObject()
+  credentials?: Record<string, unknown>;
+
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}

apps/orchestrator/src/api/agents/agent-control.service.spec.ts

@@ -0,0 +1,172 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { AgentControlService } from "./agent-control.service";
+import { PrismaService } from "../../prisma/prisma.service";
+import { KillswitchService } from "../../killswitch/killswitch.service";
+
+describe("AgentControlService", () => {
+  let service: AgentControlService;
+  let prisma: {
+    agentSessionTree: {
+      findUnique: ReturnType<typeof vi.fn>;
+      updateMany: ReturnType<typeof vi.fn>;
+    };
+    agentConversationMessage: {
+      create: ReturnType<typeof vi.fn>;
+    };
+    operatorAuditLog: {
+      create: ReturnType<typeof vi.fn>;
+    };
+  };
+  let killswitchService: {
+    killAgent: ReturnType<typeof vi.fn>;
+  };
+
+  beforeEach(() => {
+    prisma = {
+      agentSessionTree: {
+        findUnique: vi.fn(),
+        updateMany: vi.fn().mockResolvedValue({ count: 1 }),
+      },
+      agentConversationMessage: {
+        create: vi.fn().mockResolvedValue(undefined),
+      },
+      operatorAuditLog: {
+        create: vi.fn().mockResolvedValue(undefined),
+      },
+    };
+
+    killswitchService = {
+      killAgent: vi.fn().mockResolvedValue(undefined),
+    };
+
+    service = new AgentControlService(
+      prisma as unknown as PrismaService,
+      killswitchService as unknown as KillswitchService
+    );
+  });
+
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe("injectMessage", () => {
+    it("creates conversation message and audit log when tree entry exists", async () => {
+      prisma.agentSessionTree.findUnique.mockResolvedValue({ id: "tree-1" });
+
+      await service.injectMessage("agent-123", "operator-abc", "Please continue");
+
+      expect(prisma.agentSessionTree.findUnique).toHaveBeenCalledWith({
+        where: { sessionId: "agent-123" },
+        select: { id: true },
+      });
+      expect(prisma.agentConversationMessage.create).toHaveBeenCalledWith({
+        data: {
+          sessionId: "agent-123",
+          role: "operator",
+          content: "Please continue",
+          provider: "internal",
+          metadata: {},
+        },
+      });
+      expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+        data: {
+          sessionId: "agent-123",
+          userId: "operator-abc",
+          provider: "internal",
+          action: "inject",
+          metadata: {
+            payload: {
+              message: "Please continue",
+            },
+          },
+        },
+      });
+    });
+
+    it("creates only audit log when no tree entry exists", async () => {
+      prisma.agentSessionTree.findUnique.mockResolvedValue(null);
+
+      await service.injectMessage("agent-456", "operator-def", "Nudge message");
+
+      expect(prisma.agentConversationMessage.create).not.toHaveBeenCalled();
+      expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+        data: {
+          sessionId: "agent-456",
+          userId: "operator-def",
+          provider: "internal",
+          action: "inject",
+          metadata: {
+            payload: {
+              message: "Nudge message",
+            },
+          },
+        },
+      });
+    });
+  });
+
+  describe("pauseAgent", () => {
+    it("updates tree status to paused and creates audit log", async () => {
+      await service.pauseAgent("agent-789", "operator-pause");
+
+      expect(prisma.agentSessionTree.updateMany).toHaveBeenCalledWith({
+        where: { sessionId: "agent-789" },
+        data: { status: "paused" },
+      });
+      expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+        data: {
+          sessionId: "agent-789",
+          userId: "operator-pause",
+          provider: "internal",
+          action: "pause",
+          metadata: {
+            payload: {},
+          },
+        },
+      });
+    });
+  });
+
+  describe("resumeAgent", () => {
+    it("updates tree status to running and creates audit log", async () => {
+      await service.resumeAgent("agent-321", "operator-resume");
+
+      expect(prisma.agentSessionTree.updateMany).toHaveBeenCalledWith({
+        where: { sessionId: "agent-321" },
+        data: { status: "running" },
+      });
+      expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+        data: {
+          sessionId: "agent-321",
+          userId: "operator-resume",
+          provider: "internal",
+          action: "resume",
+          metadata: {
+            payload: {},
+          },
+        },
+      });
+    });
+  });
+
+  describe("killAgent", () => {
+    it("delegates kill to killswitch and logs audit", async () => {
+      await service.killAgent("agent-654", "operator-kill", false);
+
+      expect(killswitchService.killAgent).toHaveBeenCalledWith("agent-654");
+      expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+        data: {
+          sessionId: "agent-654",
+          userId: "operator-kill",
+          provider: "internal",
+          action: "kill",
+          metadata: {
+            payload: {
+              force: false,
+            },
+          },
+        },
+      });
+    });
+  });
+});

apps/orchestrator/src/api/agents/agent-control.service.ts

@@ -0,0 +1,77 @@
+import { Injectable } from "@nestjs/common";
+import type { Prisma } from "@prisma/client";
+import { KillswitchService } from "../../killswitch/killswitch.service";
+import { PrismaService } from "../../prisma/prisma.service";
+
+@Injectable()
+export class AgentControlService {
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly killswitchService: KillswitchService
+  ) {}
+
+  private toJsonValue(value: Record<string, unknown>): Prisma.InputJsonValue {
+    return value as Prisma.InputJsonValue;
+  }
+
+  private async createOperatorAuditLog(
+    agentId: string,
+    operatorId: string,
+    action: "inject" | "pause" | "resume" | "kill",
+    payload: Record<string, unknown>
+  ): Promise<void> {
+    await this.prisma.operatorAuditLog.create({
+      data: {
+        sessionId: agentId,
+        userId: operatorId,
+        provider: "internal",
+        action,
+        metadata: this.toJsonValue({ payload }),
+      },
+    });
+  }
+
+  async injectMessage(agentId: string, operatorId: string, message: string): Promise<void> {
+    const treeEntry = await this.prisma.agentSessionTree.findUnique({
+      where: { sessionId: agentId },
+      select: { id: true },
+    });
+
+    if (treeEntry) {
+      await this.prisma.agentConversationMessage.create({
+        data: {
+          sessionId: agentId,
+          role: "operator",
+          content: message,
+          provider: "internal",
+          metadata: this.toJsonValue({}),
+        },
+      });
+    }
+
+    await this.createOperatorAuditLog(agentId, operatorId, "inject", { message });
+  }
+
+  async pauseAgent(agentId: string, operatorId: string): Promise<void> {
+    await this.prisma.agentSessionTree.updateMany({
+      where: { sessionId: agentId },
+      data: { status: "paused" },
+    });
+
+    await this.createOperatorAuditLog(agentId, operatorId, "pause", {});
+  }
+
+  async resumeAgent(agentId: string, operatorId: string): Promise<void> {
+    await this.prisma.agentSessionTree.updateMany({
+      where: { sessionId: agentId },
+      data: { status: "running" },
+    });
+
+    await this.createOperatorAuditLog(agentId, operatorId, "resume", {});
+  }
+
+  async killAgent(agentId: string, operatorId: string, force = true): Promise<void> {
+    await this.killswitchService.killAgent(agentId);
+    await this.createOperatorAuditLog(agentId, operatorId, "kill", { force });
+  }
+}

apps/orchestrator/src/api/agents/agent-messages.service.spec.ts

@@ -0,0 +1,103 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { AgentMessagesService } from "./agent-messages.service";
+import { PrismaService } from "../../prisma/prisma.service";
+
+describe("AgentMessagesService", () => {
+  let service: AgentMessagesService;
+  let prisma: {
+    agentConversationMessage: {
+      findMany: ReturnType<typeof vi.fn>;
+      count: ReturnType<typeof vi.fn>;
+    };
+  };
+
+  beforeEach(() => {
+    prisma = {
+      agentConversationMessage: {
+        findMany: vi.fn(),
+        count: vi.fn(),
+      },
+    };
+
+    service = new AgentMessagesService(prisma as unknown as PrismaService);
+  });
+
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe("getMessages", () => {
+    it("returns paginated messages from Prisma", async () => {
+      const sessionId = "agent-123";
+      const messages = [
+        {
+          id: "msg-1",
+          sessionId,
+          provider: "internal",
+          role: "assistant",
+          content: "First message",
+          timestamp: new Date("2026-03-07T16:00:00.000Z"),
+          metadata: {},
+        },
+        {
+          id: "msg-2",
+          sessionId,
+          provider: "internal",
+          role: "user",
+          content: "Second message",
+          timestamp: new Date("2026-03-07T15:59:00.000Z"),
+          metadata: {},
+        },
+      ];
+
+      prisma.agentConversationMessage.findMany.mockResolvedValue(messages);
+      prisma.agentConversationMessage.count.mockResolvedValue(2);
+
+      const result = await service.getMessages(sessionId, 50, 0);
+
+      expect(prisma.agentConversationMessage.findMany).toHaveBeenCalledWith({
+        where: { sessionId },
+        orderBy: { timestamp: "desc" },
+        take: 50,
+        skip: 0,
+      });
+      expect(prisma.agentConversationMessage.count).toHaveBeenCalledWith({ where: { sessionId } });
+      expect(result).toEqual({
+        messages,
+        total: 2,
+      });
+    });
+
+    it("applies limit and cursor (skip) correctly", async () => {
+      const sessionId = "agent-456";
+      const limit = 10;
+      const cursor = 20;
+
+      prisma.agentConversationMessage.findMany.mockResolvedValue([]);
+      prisma.agentConversationMessage.count.mockResolvedValue(42);
+
+      await service.getMessages(sessionId, limit, cursor);
+
+      expect(prisma.agentConversationMessage.findMany).toHaveBeenCalledWith({
+        where: { sessionId },
+        orderBy: { timestamp: "desc" },
+        take: limit,
+        skip: cursor,
+      });
+    });
+
+    it("returns empty messages array when no messages exist", async () => {
+      const sessionId = "agent-empty";
+
+      prisma.agentConversationMessage.findMany.mockResolvedValue([]);
+      prisma.agentConversationMessage.count.mockResolvedValue(0);
+
+      const result = await service.getMessages(sessionId, 25, 0);
+
+      expect(result).toEqual({
+        messages: [],
+        total: 0,
+      });
+    });
+  });
+});

apps/orchestrator/src/api/agents/agent-provider.registry.spec.ts

@@ -0,0 +1,202 @@
+import { Logger } from "@nestjs/common";
+import type {
+  AgentMessage,
+  AgentSession,
+  AgentSessionList,
+  IAgentProvider,
+  InjectResult,
+} from "@mosaic/shared";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { AgentProviderRegistry } from "./agent-provider.registry";
+import { InternalAgentProvider } from "./internal-agent.provider";
+
+type MockProvider = IAgentProvider & {
+  listSessions: ReturnType<typeof vi.fn>;
+  getSession: ReturnType<typeof vi.fn>;
+};
+
+const emptyMessageStream = async function* (): AsyncIterable<AgentMessage> {
+  return;
+};
+
+const createProvider = (providerId: string, sessions: AgentSession[] = []): MockProvider => {
+  return {
+    providerId,
+    providerType: providerId,
+    displayName: providerId,
+    listSessions: vi.fn().mockResolvedValue({
+      sessions,
+      total: sessions.length,
+    } as AgentSessionList),
+    getSession: vi.fn().mockResolvedValue(null),
+    getMessages: vi.fn().mockResolvedValue([]),
+    injectMessage: vi.fn().mockResolvedValue({ accepted: true } as InjectResult),
+    pauseSession: vi.fn().mockResolvedValue(undefined),
+    resumeSession: vi.fn().mockResolvedValue(undefined),
+    killSession: vi.fn().mockResolvedValue(undefined),
+    streamMessages: vi.fn().mockReturnValue(emptyMessageStream()),
+    isAvailable: vi.fn().mockResolvedValue(true),
+  };
+};
+
+describe("AgentProviderRegistry", () => {
+  let registry: AgentProviderRegistry;
+  let internalProvider: MockProvider;
+
+  beforeEach(() => {
+    internalProvider = createProvider("internal");
+    registry = new AgentProviderRegistry(internalProvider as unknown as InternalAgentProvider);
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it("registers InternalAgentProvider on module init", () => {
+    registry.onModuleInit();
+
+    expect(registry.getProvider("internal")).toBe(internalProvider);
+  });
+
+  it("registers providers and returns null for unknown provider ids", () => {
+    const externalProvider = createProvider("openclaw");
+
+    registry.registerProvider(externalProvider);
+
+    expect(registry.getProvider("openclaw")).toBe(externalProvider);
+    expect(registry.getProvider("missing")).toBeNull();
+  });
+
+  it("aggregates and sorts sessions from all providers", async () => {
+    const internalSessions: AgentSession[] = [
+      {
+        id: "session-older",
+        providerId: "internal",
+        providerType: "internal",
+        status: "active",
+        createdAt: new Date("2026-03-07T10:00:00.000Z"),
+        updatedAt: new Date("2026-03-07T10:10:00.000Z"),
+      },
+    ];
+
+    const externalSessions: AgentSession[] = [
+      {
+        id: "session-newer",
+        providerId: "openclaw",
+        providerType: "external",
+        status: "paused",
+        createdAt: new Date("2026-03-07T09:00:00.000Z"),
+        updatedAt: new Date("2026-03-07T10:20:00.000Z"),
+      },
+    ];
+
+    internalProvider.listSessions.mockResolvedValue({
+      sessions: internalSessions,
+      total: internalSessions.length,
+    } as AgentSessionList);
+
+    const externalProvider = createProvider("openclaw", externalSessions);
+    registry.onModuleInit();
+    registry.registerProvider(externalProvider);
+
+    const result = await registry.listAllSessions();
+
+    expect(result.map((session) => session.id)).toEqual(["session-newer", "session-older"]);
+    expect(internalProvider.listSessions).toHaveBeenCalledTimes(1);
+    expect(externalProvider.listSessions).toHaveBeenCalledTimes(1);
+  });
+
+  it("skips provider failures and logs warning", async () => {
+    const warnSpy = vi.spyOn(Logger.prototype, "warn").mockImplementation(() => undefined);
+
+    const healthyProvider = createProvider("healthy", [
+      {
+        id: "session-1",
+        providerId: "healthy",
+        providerType: "external",
+        status: "active",
+        createdAt: new Date("2026-03-07T11:00:00.000Z"),
+        updatedAt: new Date("2026-03-07T11:00:00.000Z"),
+      },
+    ]);
+
+    const failingProvider = createProvider("failing");
+    failingProvider.listSessions.mockRejectedValue(new Error("provider offline"));
+
+    registry.onModuleInit();
+    registry.registerProvider(healthyProvider);
+    registry.registerProvider(failingProvider);
+
+    const result = await registry.listAllSessions();
+
+    expect(result).toHaveLength(1);
+    expect(result[0]?.id).toBe("session-1");
+    expect(warnSpy).toHaveBeenCalledWith(
+      expect.stringContaining("Failed to list sessions for provider failing")
+    );
+  });
+
+  it("finds a provider for an existing session", async () => {
+    const targetSession: AgentSession = {
+      id: "session-found",
+      providerId: "openclaw",
+      providerType: "external",
+      status: "active",
+      createdAt: new Date("2026-03-07T12:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T12:10:00.000Z"),
+    };
+
+    const openclawProvider = createProvider("openclaw");
+    openclawProvider.getSession.mockResolvedValue(targetSession);
+
+    registry.onModuleInit();
+    registry.registerProvider(openclawProvider);
+
+    const result = await registry.getProviderForSession(targetSession.id);
+
+    expect(result).toEqual({
+      provider: openclawProvider,
+      session: targetSession,
+    });
+    expect(internalProvider.getSession).toHaveBeenCalledWith(targetSession.id);
+    expect(openclawProvider.getSession).toHaveBeenCalledWith(targetSession.id);
+  });
+
+  it("returns null when no provider has the requested session", async () => {
+    const openclawProvider = createProvider("openclaw");
+
+    registry.onModuleInit();
+    registry.registerProvider(openclawProvider);
+
+    await expect(registry.getProviderForSession("missing-session")).resolves.toBeNull();
+  });
+
+  it("continues searching providers when getSession throws", async () => {
+    const warnSpy = vi.spyOn(Logger.prototype, "warn").mockImplementation(() => undefined);
+    const failingProvider = createProvider("failing");
+    failingProvider.getSession.mockRejectedValue(new Error("provider timeout"));
+
+    const healthySession: AgentSession = {
+      id: "session-healthy",
+      providerId: "healthy",
+      providerType: "external",
+      status: "active",
+      createdAt: new Date("2026-03-07T12:15:00.000Z"),
+      updatedAt: new Date("2026-03-07T12:16:00.000Z"),
+    };
+
+    const healthyProvider = createProvider("healthy");
+    healthyProvider.getSession.mockResolvedValue(healthySession);
+
+    registry.onModuleInit();
+    registry.registerProvider(failingProvider);
+    registry.registerProvider(healthyProvider);
+
+    const result = await registry.getProviderForSession(healthySession.id);
+
+    expect(result).toEqual({ provider: healthyProvider, session: healthySession });
+    expect(warnSpy).toHaveBeenCalledWith(
+      expect.stringContaining("Failed to get session session-healthy for provider failing")
+    );
+  });
+});

apps/orchestrator/src/api/agents/agent-provider.registry.ts

@@ -0,0 +1,79 @@
+import { Injectable, Logger, OnModuleInit } from "@nestjs/common";
+import type { AgentSession, IAgentProvider } from "@mosaic/shared";
+import { InternalAgentProvider } from "./internal-agent.provider";
+
+@Injectable()
+export class AgentProviderRegistry implements OnModuleInit {
+  private readonly logger = new Logger(AgentProviderRegistry.name);
+  private readonly providers = new Map<string, IAgentProvider>();
+
+  constructor(private readonly internalProvider: InternalAgentProvider) {}
+
+  onModuleInit(): void {
+    this.registerProvider(this.internalProvider);
+  }
+
+  registerProvider(provider: IAgentProvider): void {
+    const existingProvider = this.providers.get(provider.providerId);
+    if (existingProvider !== undefined) {
+      this.logger.warn(`Replacing existing provider registration for ${provider.providerId}`);
+    }
+
+    this.providers.set(provider.providerId, provider);
+  }
+
+  getProvider(providerId: string): IAgentProvider | null {
+    return this.providers.get(providerId) ?? null;
+  }
+
+  async getProviderForSession(
+    sessionId: string
+  ): Promise<{ provider: IAgentProvider; session: AgentSession } | null> {
+    for (const provider of this.providers.values()) {
+      try {
+        const session = await provider.getSession(sessionId);
+        if (session !== null) {
+          return {
+            provider,
+            session,
+          };
+        }
+      } catch (error) {
+        this.logger.warn(
+          `Failed to get session ${sessionId} for provider ${provider.providerId}: ${this.toErrorMessage(error)}`
+        );
+      }
+    }
+
+    return null;
+  }
+
+  async listAllSessions(): Promise<AgentSession[]> {
+    const providers = [...this.providers.values()];
+    const sessionsByProvider = await Promise.all(
+      providers.map(async (provider) => {
+        try {
+          const { sessions } = await provider.listSessions();
+          return sessions;
+        } catch (error) {
+          this.logger.warn(
+            `Failed to list sessions for provider ${provider.providerId}: ${this.toErrorMessage(error)}`
+          );
+          return [];
+        }
+      })
+    );
+
+    return sessionsByProvider
+      .flat()
+      .sort((left, right) => right.updatedAt.getTime() - left.updatedAt.getTime());
+  }
+
+  private toErrorMessage(error: unknown): string {
+    if (error instanceof Error) {
+      return error.message;
+    }
+
+    return String(error);
+  }
+}

apps/orchestrator/src/api/agents/agent-tree.service.spec.ts

@@ -0,0 +1,245 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { AgentTreeService } from "./agent-tree.service";
+import { PrismaService } from "../../prisma/prisma.service";
+
+describe("AgentTreeService", () => {
+  let service: AgentTreeService;
+  let prisma: {
+    agentSessionTree: {
+      findMany: ReturnType<typeof vi.fn>;
+      count: ReturnType<typeof vi.fn>;
+      findUnique: ReturnType<typeof vi.fn>;
+    };
+  };
+
+  beforeEach(() => {
+    prisma = {
+      agentSessionTree: {
+        findMany: vi.fn(),
+        count: vi.fn(),
+        findUnique: vi.fn(),
+      },
+    };
+
+    service = new AgentTreeService(prisma as unknown as PrismaService);
+  });
+
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe("listSessions", () => {
+    it("returns paginated sessions and cursor", async () => {
+      const sessions = [
+        {
+          id: "tree-2",
+          sessionId: "agent-2",
+          parentSessionId: null,
+          provider: "internal",
+          missionId: null,
+          taskId: "task-2",
+          taskSource: "queue",
+          agentType: "worker",
+          status: "running",
+          spawnedAt: new Date("2026-03-07T11:00:00.000Z"),
+          completedAt: null,
+          metadata: {},
+        },
+        {
+          id: "tree-1",
+          sessionId: "agent-1",
+          parentSessionId: null,
+          provider: "internal",
+          missionId: null,
+          taskId: "task-1",
+          taskSource: "queue",
+          agentType: "worker",
+          status: "running",
+          spawnedAt: new Date("2026-03-07T10:00:00.000Z"),
+          completedAt: null,
+          metadata: {},
+        },
+      ];
+
+      prisma.agentSessionTree.findMany.mockResolvedValue(sessions);
+      prisma.agentSessionTree.count.mockResolvedValue(7);
+
+      const result = await service.listSessions(undefined, 2);
+
+      expect(prisma.agentSessionTree.findMany).toHaveBeenCalledWith({
+        where: undefined,
+        orderBy: [{ spawnedAt: "desc" }, { sessionId: "desc" }],
+        take: 2,
+      });
+      expect(prisma.agentSessionTree.count).toHaveBeenCalledWith();
+      expect(result.sessions).toEqual(sessions);
+      expect(result.total).toBe(7);
+      expect(result.cursor).toBeTypeOf("string");
+    });
+
+    it("applies cursor filter when provided", async () => {
+      prisma.agentSessionTree.findMany.mockResolvedValue([]);
+      prisma.agentSessionTree.count.mockResolvedValue(0);
+
+      const cursorDate = "2026-03-07T10:00:00.000Z";
+      const cursorSessionId = "agent-5";
+      const cursor = Buffer.from(
+        JSON.stringify({
+          spawnedAt: cursorDate,
+          sessionId: cursorSessionId,
+        }),
+        "utf8"
+      ).toString("base64url");
+
+      await service.listSessions(cursor, 25);
+
+      expect(prisma.agentSessionTree.findMany).toHaveBeenCalledWith({
+        where: {
+          OR: [
+            {
+              spawnedAt: {
+                lt: new Date(cursorDate),
+              },
+            },
+            {
+              spawnedAt: new Date(cursorDate),
+              sessionId: {
+                lt: cursorSessionId,
+              },
+            },
+          ],
+        },
+        orderBy: [{ spawnedAt: "desc" }, { sessionId: "desc" }],
+        take: 25,
+      });
+    });
+
+    it("ignores invalid cursor values", async () => {
+      prisma.agentSessionTree.findMany.mockResolvedValue([]);
+      prisma.agentSessionTree.count.mockResolvedValue(0);
+
+      await service.listSessions("invalid-cursor", 10);
+
+      expect(prisma.agentSessionTree.findMany).toHaveBeenCalledWith({
+        where: undefined,
+        orderBy: [{ spawnedAt: "desc" }, { sessionId: "desc" }],
+        take: 10,
+      });
+    });
+  });
+
+  describe("getSession", () => {
+    it("returns matching session entry", async () => {
+      const session = {
+        id: "tree-1",
+        sessionId: "agent-123",
+        parentSessionId: null,
+        provider: "internal",
+        missionId: null,
+        taskId: "task-1",
+        taskSource: "queue",
+        agentType: "worker",
+        status: "running",
+        spawnedAt: new Date("2026-03-07T11:00:00.000Z"),
+        completedAt: null,
+        metadata: {},
+      };
+      prisma.agentSessionTree.findUnique.mockResolvedValue(session);
+
+      const result = await service.getSession("agent-123");
+
+      expect(prisma.agentSessionTree.findUnique).toHaveBeenCalledWith({
+        where: { sessionId: "agent-123" },
+      });
+      expect(result).toEqual(session);
+    });
+
+    it("returns null when session does not exist", async () => {
+      prisma.agentSessionTree.findUnique.mockResolvedValue(null);
+
+      const result = await service.getSession("agent-missing");
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe("getTree", () => {
+    it("returns mapped entries from Prisma", async () => {
+      prisma.agentSessionTree.findMany.mockResolvedValue([
+        {
+          id: "tree-1",
+          sessionId: "agent-1",
+          parentSessionId: "agent-root",
+          provider: "internal",
+          missionId: "mission-1",
+          taskId: "task-1",
+          taskSource: "queue",
+          agentType: "worker",
+          status: "running",
+          spawnedAt: new Date("2026-03-07T10:00:00.000Z"),
+          completedAt: new Date("2026-03-07T11:00:00.000Z"),
+          metadata: {},
+        },
+      ]);
+
+      const result = await service.getTree();
+
+      expect(prisma.agentSessionTree.findMany).toHaveBeenCalledWith({
+        orderBy: { spawnedAt: "desc" },
+        take: 200,
+      });
+      expect(result).toEqual([
+        {
+          sessionId: "agent-1",
+          parentSessionId: "agent-root",
+          status: "running",
+          agentType: "worker",
+          taskSource: "queue",
+          spawnedAt: "2026-03-07T10:00:00.000Z",
+          completedAt: "2026-03-07T11:00:00.000Z",
+        },
+      ]);
+    });
+
+    it("returns empty array when no entries exist", async () => {
+      prisma.agentSessionTree.findMany.mockResolvedValue([]);
+
+      const result = await service.getTree();
+
+      expect(result).toEqual([]);
+    });
+
+    it("maps null parentSessionId and completedAt correctly", async () => {
+      prisma.agentSessionTree.findMany.mockResolvedValue([
+        {
+          id: "tree-2",
+          sessionId: "agent-root",
+          parentSessionId: null,
+          provider: "internal",
+          missionId: null,
+          taskId: null,
+          taskSource: null,
+          agentType: null,
+          status: "spawning",
+          spawnedAt: new Date("2026-03-07T09:00:00.000Z"),
+          completedAt: null,
+          metadata: {},
+        },
+      ]);
+
+      const result = await service.getTree();
+
+      expect(result).toEqual([
+        {
+          sessionId: "agent-root",
+          parentSessionId: null,
+          status: "spawning",
+          agentType: null,
+          taskSource: null,
+          spawnedAt: "2026-03-07T09:00:00.000Z",
+          completedAt: null,
+        },
+      ]);
+    });
+  });
+});

apps/orchestrator/src/api/agents/agent-tree.service.ts

@@ -0,0 +1,146 @@
+import { Injectable } from "@nestjs/common";
+import type { AgentSessionTree, Prisma } from "@prisma/client";
+import { AgentTreeResponseDto } from "./dto/agent-tree-response.dto";
+import { PrismaService } from "../../prisma/prisma.service";
+
+const DEFAULT_PAGE_LIMIT = 50;
+const MAX_PAGE_LIMIT = 200;
+
+interface SessionCursor {
+  spawnedAt: Date;
+  sessionId: string;
+}
+
+export interface AgentSessionTreeListResult {
+  sessions: AgentSessionTree[];
+  total: number;
+  cursor?: string;
+}
+
+@Injectable()
+export class AgentTreeService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async listSessions(
+    cursor?: string,
+    limit = DEFAULT_PAGE_LIMIT
+  ): Promise<AgentSessionTreeListResult> {
+    const safeLimit = this.normalizeLimit(limit);
+    const parsedCursor = this.parseCursor(cursor);
+
+    const where: Prisma.AgentSessionTreeWhereInput | undefined = parsedCursor
+      ? {
+          OR: [
+            {
+              spawnedAt: {
+                lt: parsedCursor.spawnedAt,
+              },
+            },
+            {
+              spawnedAt: parsedCursor.spawnedAt,
+              sessionId: {
+                lt: parsedCursor.sessionId,
+              },
+            },
+          ],
+        }
+      : undefined;
+
+    const [sessions, total] = await Promise.all([
+      this.prisma.agentSessionTree.findMany({
+        where,
+        orderBy: [{ spawnedAt: "desc" }, { sessionId: "desc" }],
+        take: safeLimit,
+      }),
+      this.prisma.agentSessionTree.count(),
+    ]);
+
+    const nextCursor =
+      sessions.length === safeLimit
+        ? this.serializeCursor(sessions[sessions.length - 1])
+        : undefined;
+
+    return {
+      sessions,
+      total,
+      ...(nextCursor !== undefined ? { cursor: nextCursor } : {}),
+    };
+  }
+
+  async getSession(sessionId: string): Promise<AgentSessionTree | null> {
+    return this.prisma.agentSessionTree.findUnique({
+      where: { sessionId },
+    });
+  }
+
+  async getTree(): Promise<AgentTreeResponseDto[]> {
+    const entries = await this.prisma.agentSessionTree.findMany({
+      orderBy: { spawnedAt: "desc" },
+      take: 200,
+    });
+
+    const response: AgentTreeResponseDto[] = [];
+    for (const entry of entries) {
+      response.push({
+        sessionId: entry.sessionId,
+        parentSessionId: entry.parentSessionId ?? null,
+        status: entry.status,
+        agentType: entry.agentType ?? null,
+        taskSource: entry.taskSource ?? null,
+        spawnedAt: entry.spawnedAt.toISOString(),
+        completedAt: entry.completedAt?.toISOString() ?? null,
+      });
+    }
+
+    return response;
+  }
+
+  private normalizeLimit(limit: number): number {
+    const normalized = Number.isFinite(limit) ? Math.trunc(limit) : DEFAULT_PAGE_LIMIT;
+    if (normalized < 1) {
+      return 1;
+    }
+
+    return Math.min(normalized, MAX_PAGE_LIMIT);
+  }
+
+  private serializeCursor(entry: Pick<AgentSessionTree, "spawnedAt" | "sessionId">): string {
+    return Buffer.from(
+      JSON.stringify({
+        spawnedAt: entry.spawnedAt.toISOString(),
+        sessionId: entry.sessionId,
+      }),
+      "utf8"
+    ).toString("base64url");
+  }
+
+  private parseCursor(cursor?: string): SessionCursor | null {
+    if (!cursor) {
+      return null;
+    }
+
+    try {
+      const decoded = Buffer.from(cursor, "base64url").toString("utf8");
+      const parsed = JSON.parse(decoded) as {
+        spawnedAt?: string;
+        sessionId?: string;
+      };
+
+      if (typeof parsed.spawnedAt !== "string" || typeof parsed.sessionId !== "string") {
+        return null;
+      }
+
+      const spawnedAt = new Date(parsed.spawnedAt);
+      if (Number.isNaN(spawnedAt.getTime())) {
+        return null;
+      }
+
+      return {
+        spawnedAt,
+        sessionId: parsed.sessionId,
+      };
+    } catch {
+      return null;
+    }
+  }
+}

apps/orchestrator/src/api/agents/agents-killswitch.controller.spec.ts

@@ -6,6 +6,8 @@ import { AgentLifecycleService } from "../../spawner/agent-lifecycle.service";
 import { KillswitchService } from "../../killswitch/killswitch.service";
 import { AgentEventsService } from "./agent-events.service";
 import { AgentMessagesService } from "./agent-messages.service";
+import { AgentControlService } from "./agent-control.service";
+import { AgentTreeService } from "./agent-tree.service";
 import type { KillAllResult } from "../../killswitch/killswitch.service";
 
 describe("AgentsController - Killswitch Endpoints", () => {
@@ -35,6 +37,14 @@ describe("AgentsController - Killswitch Endpoints", () => {
     getReplayMessages: ReturnType<typeof vi.fn>;
     getMessagesAfter: ReturnType<typeof vi.fn>;
   };
+  let mockControlService: {
+    injectMessage: ReturnType<typeof vi.fn>;
+    pauseAgent: ReturnType<typeof vi.fn>;
+    resumeAgent: ReturnType<typeof vi.fn>;
+  };
+  let mockTreeService: {
+    getTree: ReturnType<typeof vi.fn>;
+  };
 
   beforeEach(() => {
     mockKillswitchService = {
@@ -77,13 +87,25 @@ describe("AgentsController - Killswitch Endpoints", () => {
       getMessagesAfter: vi.fn().mockResolvedValue([]),
     };
 
+    mockControlService = {
+      injectMessage: vi.fn().mockResolvedValue(undefined),
+      pauseAgent: vi.fn().mockResolvedValue(undefined),
+      resumeAgent: vi.fn().mockResolvedValue(undefined),
+    };
+
+    mockTreeService = {
+      getTree: vi.fn().mockResolvedValue([]),
+    };
+
     controller = new AgentsController(
       mockQueueService as unknown as QueueService,
       mockSpawnerService as unknown as AgentSpawnerService,
       mockLifecycleService as unknown as AgentLifecycleService,
       mockKillswitchService as unknown as KillswitchService,
       mockEventsService as unknown as AgentEventsService,
-      mockMessagesService as unknown as AgentMessagesService
+      mockMessagesService as unknown as AgentMessagesService,
+      mockControlService as unknown as AgentControlService,
+      mockTreeService as unknown as AgentTreeService
     );
   });
 

apps/orchestrator/src/api/agents/agents.controller.spec.ts

@@ -5,6 +5,8 @@ import { AgentLifecycleService } from "../../spawner/agent-lifecycle.service";
 import { KillswitchService } from "../../killswitch/killswitch.service";
 import { AgentEventsService } from "./agent-events.service";
 import { AgentMessagesService } from "./agent-messages.service";
+import { AgentControlService } from "./agent-control.service";
+import { AgentTreeService } from "./agent-tree.service";
 import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
 
 describe("AgentsController", () => {
@@ -36,6 +38,14 @@ describe("AgentsController", () => {
     getReplayMessages: ReturnType<typeof vi.fn>;
     getMessagesAfter: ReturnType<typeof vi.fn>;
   };
+  let controlService: {
+    injectMessage: ReturnType<typeof vi.fn>;
+    pauseAgent: ReturnType<typeof vi.fn>;
+    resumeAgent: ReturnType<typeof vi.fn>;
+  };
+  let treeService: {
+    getTree: ReturnType<typeof vi.fn>;
+  };
 
   beforeEach(() => {
     // Create mock services
@@ -81,6 +91,16 @@ describe("AgentsController", () => {
       getMessagesAfter: vi.fn().mockResolvedValue([]),
     };
 
+    controlService = {
+      injectMessage: vi.fn().mockResolvedValue(undefined),
+      pauseAgent: vi.fn().mockResolvedValue(undefined),
+      resumeAgent: vi.fn().mockResolvedValue(undefined),
+    };
+
+    treeService = {
+      getTree: vi.fn().mockResolvedValue([]),
+    };
+
     // Create controller with mocked services
     controller = new AgentsController(
       queueService as unknown as QueueService,
@@ -88,7 +108,9 @@ describe("AgentsController", () => {
       lifecycleService as unknown as AgentLifecycleService,
       killswitchService as unknown as KillswitchService,
       eventsService as unknown as AgentEventsService,
-      messagesService as unknown as AgentMessagesService
+      messagesService as unknown as AgentMessagesService,
+      controlService as unknown as AgentControlService,
+      treeService as unknown as AgentTreeService
     );
   });
 
@@ -100,6 +122,27 @@ describe("AgentsController", () => {
     expect(controller).toBeDefined();
   });
 
+  describe("getAgentTree", () => {
+    it("should return tree entries", async () => {
+      const entries = [
+        {
+          sessionId: "agent-1",
+          parentSessionId: null,
+          status: "running",
+          agentType: "worker",
+          taskSource: "internal",
+          spawnedAt: "2026-03-07T00:00:00.000Z",
+          completedAt: null,
+        },
+      ];
+
+      treeService.getTree.mockResolvedValue(entries);
+
+      await expect(controller.getAgentTree()).resolves.toEqual(entries);
+      expect(treeService.getTree).toHaveBeenCalledTimes(1);
+    });
+  });
+
   describe("listAgents", () => {
     it("should return empty array when no agents exist", () => {
       // Arrange
@@ -378,6 +421,47 @@ describe("AgentsController", () => {
     });
   });
 
+  describe("agent control endpoints", () => {
+    const agentId = "0b64079f-4487-42b9-92eb-cf8ea0042a64";
+
+    it("should inject an operator message", async () => {
+      const req = { apiKey: "control-key" };
+
+      const result = await controller.injectAgentMessage(
+        agentId,
+        { message: "pause and summarize" },
+        req
+      );
+
+      expect(controlService.injectMessage).toHaveBeenCalledWith(
+        agentId,
+        "control-key",
+        "pause and summarize"
+      );
+      expect(result).toEqual({ message: `Message injected into agent ${agentId}` });
+    });
+
+    it("should default operator id when request api key is missing", async () => {
+      await controller.injectAgentMessage(agentId, { message: "continue" }, {});
+
+      expect(controlService.injectMessage).toHaveBeenCalledWith(agentId, "operator", "continue");
+    });
+
+    it("should pause an agent", async () => {
+      const result = await controller.pauseAgent(agentId, {}, { apiKey: "ops-user" });
+
+      expect(controlService.pauseAgent).toHaveBeenCalledWith(agentId, "ops-user");
+      expect(result).toEqual({ message: `Agent ${agentId} paused` });
+    });
+
+    it("should resume an agent", async () => {
+      const result = await controller.resumeAgent(agentId, {}, { apiKey: "ops-user" });
+
+      expect(controlService.resumeAgent).toHaveBeenCalledWith(agentId, "ops-user");
+      expect(result).toEqual({ message: `Agent ${agentId} resumed` });
+    });
+  });
+
   describe("getAgentMessages", () => {
     it("should return paginated message history", async () => {
       const agentId = "0b64079f-4487-42b9-92eb-cf8ea0042a64";

apps/orchestrator/src/api/agents/agents.controller.ts

@@ -14,6 +14,7 @@ import {
   Sse,
   MessageEvent,
   Query,
+  Request,
 } from "@nestjs/common";
 import type { AgentConversationMessage } from "@prisma/client";
 import { Throttle } from "@nestjs/throttler";
@@ -28,6 +29,11 @@ import { OrchestratorThrottlerGuard } from "../../common/guards/throttler.guard"
 import { AgentEventsService } from "./agent-events.service";
 import { GetMessagesQueryDto } from "./dto/get-messages-query.dto";
 import { AgentMessagesService } from "./agent-messages.service";
+import { AgentControlService } from "./agent-control.service";
+import { AgentTreeService } from "./agent-tree.service";
+import { AgentTreeResponseDto } from "./dto/agent-tree-response.dto";
+import { InjectAgentDto } from "./dto/inject-agent.dto";
+import { PauseAgentDto, ResumeAgentDto } from "./dto/control-agent.dto";
 
 /**
  * Controller for agent management endpoints
@@ -51,7 +57,9 @@ export class AgentsController {
     private readonly lifecycleService: AgentLifecycleService,
     private readonly killswitchService: KillswitchService,
     private readonly eventsService: AgentEventsService,
-    private readonly messagesService: AgentMessagesService
+    private readonly messagesService: AgentMessagesService,
+    private readonly agentControlService: AgentControlService,
+    private readonly agentTreeService: AgentTreeService
   ) {}
 
   /**
@@ -73,6 +81,7 @@ export class AgentsController {
       // Spawn agent using spawner service
       const spawnResponse = this.spawnerService.spawnAgent({
         taskId: dto.taskId,
+        ...(dto.parentAgentId !== undefined ? { parentAgentId: dto.parentAgentId } : {}),
         agentType: dto.agentType,
         context: dto.context,
       });
@@ -147,6 +156,13 @@ export class AgentsController {
     };
   }
 
+  @Get("tree")
+  @UseGuards(OrchestratorApiKeyGuard)
+  @Throttle({ default: { limit: 200, ttl: 60000 } })
+  async getAgentTree(): Promise<AgentTreeResponseDto[]> {
+    return this.agentTreeService.getTree();
+  }
+
   /**
    * List all agents
    * @returns Array of all agent sessions with their status
@@ -374,6 +390,57 @@ export class AgentsController {
     }
   }
 
+  @Post(":agentId/inject")
+  @Throttle({ default: { limit: 10, ttl: 60000 } })
+  @HttpCode(200)
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async injectAgentMessage(
+    @Param("agentId", ParseUUIDPipe) agentId: string,
+    @Body() dto: InjectAgentDto,
+    @Request() req: { apiKey?: string }
+  ): Promise<{ message: string }> {
+    const operatorId = req.apiKey ?? "operator";
+    await this.agentControlService.injectMessage(agentId, operatorId, dto.message);
+
+    return {
+      message: `Message injected into agent ${agentId}`,
+    };
+  }
+
+  @Post(":agentId/pause")
+  @Throttle({ default: { limit: 10, ttl: 60000 } })
+  @HttpCode(200)
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async pauseAgent(
+    @Param("agentId", ParseUUIDPipe) agentId: string,
+    @Body() _dto: PauseAgentDto,
+    @Request() req: { apiKey?: string }
+  ): Promise<{ message: string }> {
+    const operatorId = req.apiKey ?? "operator";
+    await this.agentControlService.pauseAgent(agentId, operatorId);
+
+    return {
+      message: `Agent ${agentId} paused`,
+    };
+  }
+
+  @Post(":agentId/resume")
+  @Throttle({ default: { limit: 10, ttl: 60000 } })
+  @HttpCode(200)
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async resumeAgent(
+    @Param("agentId", ParseUUIDPipe) agentId: string,
+    @Body() _dto: ResumeAgentDto,
+    @Request() req: { apiKey?: string }
+  ): Promise<{ message: string }> {
+    const operatorId = req.apiKey ?? "operator";
+    await this.agentControlService.resumeAgent(agentId, operatorId);
+
+    return {
+      message: `Agent ${agentId} resumed`,
+    };
+  }
+
   /**
    * Kill all active agents
    * @returns Summary of kill operation

apps/orchestrator/src/api/agents/agents.module.ts

@@ -8,10 +8,23 @@ import { OrchestratorApiKeyGuard } from "../../common/guards/api-key.guard";
 import { AgentEventsService } from "./agent-events.service";
 import { PrismaModule } from "../../prisma/prisma.module";
 import { AgentMessagesService } from "./agent-messages.service";
+import { AgentControlService } from "./agent-control.service";
+import { AgentTreeService } from "./agent-tree.service";
+import { InternalAgentProvider } from "./internal-agent.provider";
+import { AgentProviderRegistry } from "./agent-provider.registry";
 
 @Module({
   imports: [QueueModule, SpawnerModule, KillswitchModule, ValkeyModule, PrismaModule],
   controllers: [AgentsController],
-  providers: [OrchestratorApiKeyGuard, AgentEventsService, AgentMessagesService],
+  providers: [
+    OrchestratorApiKeyGuard,
+    AgentEventsService,
+    AgentMessagesService,
+    AgentControlService,
+    AgentTreeService,
+    InternalAgentProvider,
+    AgentProviderRegistry,
+  ],
+  exports: [InternalAgentProvider, AgentProviderRegistry],
 })
 export class AgentsModule {}

apps/orchestrator/src/api/agents/dto/agent-tree-response.dto.ts

@@ -0,0 +1,9 @@
+export class AgentTreeResponseDto {
+  sessionId!: string;
+  parentSessionId!: string | null;
+  status!: string;
+  agentType!: string | null;
+  taskSource!: string | null;
+  spawnedAt!: string;
+  completedAt!: string | null;
+}

apps/orchestrator/src/api/agents/dto/control-agent.dto.ts

@@ -0,0 +1,3 @@
+export class PauseAgentDto {}
+
+export class ResumeAgentDto {}

apps/orchestrator/src/api/agents/dto/inject-agent.dto.ts

@@ -0,0 +1,7 @@
+import { IsNotEmpty, IsString } from "class-validator";
+
+export class InjectAgentDto {
+  @IsString()
+  @IsNotEmpty()
+  message!: string;
+}

apps/orchestrator/src/api/agents/dto/spawn-agent.dto.ts

@@ -116,6 +116,10 @@ export class SpawnAgentDto {
   @IsOptional()
   @IsIn(["strict", "standard", "minimal", "custom"])
   gateProfile?: GateProfileType;
+
+  @IsOptional()
+  @IsString()
+  parentAgentId?: string;
 }
 
 /**

apps/orchestrator/src/api/agents/internal-agent.provider.spec.ts

@@ -0,0 +1,216 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { AgentConversationMessage, AgentSessionTree } from "@prisma/client";
+import { AgentControlService } from "./agent-control.service";
+import { AgentMessagesService } from "./agent-messages.service";
+import { AgentTreeService } from "./agent-tree.service";
+import { InternalAgentProvider } from "./internal-agent.provider";
+
+describe("InternalAgentProvider", () => {
+  let provider: InternalAgentProvider;
+  let messagesService: {
+    getMessages: ReturnType<typeof vi.fn>;
+    getReplayMessages: ReturnType<typeof vi.fn>;
+    getMessagesAfter: ReturnType<typeof vi.fn>;
+  };
+  let controlService: {
+    injectMessage: ReturnType<typeof vi.fn>;
+    pauseAgent: ReturnType<typeof vi.fn>;
+    resumeAgent: ReturnType<typeof vi.fn>;
+    killAgent: ReturnType<typeof vi.fn>;
+  };
+  let treeService: {
+    listSessions: ReturnType<typeof vi.fn>;
+    getSession: ReturnType<typeof vi.fn>;
+  };
+
+  beforeEach(() => {
+    messagesService = {
+      getMessages: vi.fn(),
+      getReplayMessages: vi.fn(),
+      getMessagesAfter: vi.fn(),
+    };
+
+    controlService = {
+      injectMessage: vi.fn().mockResolvedValue(undefined),
+      pauseAgent: vi.fn().mockResolvedValue(undefined),
+      resumeAgent: vi.fn().mockResolvedValue(undefined),
+      killAgent: vi.fn().mockResolvedValue(undefined),
+    };
+
+    treeService = {
+      listSessions: vi.fn(),
+      getSession: vi.fn(),
+    };
+
+    provider = new InternalAgentProvider(
+      messagesService as unknown as AgentMessagesService,
+      controlService as unknown as AgentControlService,
+      treeService as unknown as AgentTreeService
+    );
+  });
+
+  it("maps paginated sessions", async () => {
+    const sessionEntry: AgentSessionTree = {
+      id: "tree-1",
+      sessionId: "session-1",
+      parentSessionId: "parent-1",
+      provider: "internal",
+      missionId: null,
+      taskId: "task-123",
+      taskSource: "queue",
+      agentType: "worker",
+      status: "running",
+      spawnedAt: new Date("2026-03-07T10:00:00.000Z"),
+      completedAt: null,
+      metadata: { branch: "feat/test" },
+    };
+
+    treeService.listSessions.mockResolvedValue({
+      sessions: [sessionEntry],
+      total: 1,
+      cursor: "next-cursor",
+    });
+
+    const result = await provider.listSessions("cursor-1", 25);
+
+    expect(treeService.listSessions).toHaveBeenCalledWith("cursor-1", 25);
+    expect(result).toEqual({
+      sessions: [
+        {
+          id: "session-1",
+          providerId: "internal",
+          providerType: "internal",
+          label: "task-123",
+          status: "active",
+          parentSessionId: "parent-1",
+          createdAt: new Date("2026-03-07T10:00:00.000Z"),
+          updatedAt: new Date("2026-03-07T10:00:00.000Z"),
+          metadata: { branch: "feat/test" },
+        },
+      ],
+      total: 1,
+      cursor: "next-cursor",
+    });
+  });
+
+  it("returns null for missing session", async () => {
+    treeService.getSession.mockResolvedValue(null);
+
+    const result = await provider.getSession("missing-session");
+
+    expect(treeService.getSession).toHaveBeenCalledWith("missing-session");
+    expect(result).toBeNull();
+  });
+
+  it("maps message history and parses skip cursor", async () => {
+    const message: AgentConversationMessage = {
+      id: "msg-1",
+      sessionId: "session-1",
+      provider: "internal",
+      role: "agent",
+      content: "hello",
+      timestamp: new Date("2026-03-07T10:05:00.000Z"),
+      metadata: { tokens: 42 },
+    };
+
+    messagesService.getMessages.mockResolvedValue({
+      messages: [message],
+      total: 10,
+    });
+
+    const result = await provider.getMessages("session-1", 30, "2");
+
+    expect(messagesService.getMessages).toHaveBeenCalledWith("session-1", 30, 2);
+    expect(result).toEqual([
+      {
+        id: "msg-1",
+        sessionId: "session-1",
+        role: "assistant",
+        content: "hello",
+        timestamp: new Date("2026-03-07T10:05:00.000Z"),
+        metadata: { tokens: 42 },
+      },
+    ]);
+  });
+
+  it("routes control operations through AgentControlService", async () => {
+    const injectResult = await provider.injectMessage("session-1", "new instruction");
+
+    await provider.pauseSession("session-1");
+    await provider.resumeSession("session-1");
+    await provider.killSession("session-1", false);
+
+    expect(controlService.injectMessage).toHaveBeenCalledWith(
+      "session-1",
+      "internal-provider",
+      "new instruction"
+    );
+    expect(injectResult).toEqual({ accepted: true });
+    expect(controlService.pauseAgent).toHaveBeenCalledWith("session-1", "internal-provider");
+    expect(controlService.resumeAgent).toHaveBeenCalledWith("session-1", "internal-provider");
+    expect(controlService.killAgent).toHaveBeenCalledWith("session-1", "internal-provider", false);
+  });
+
+  it("streams replay and incremental messages", async () => {
+    const replayMessage: AgentConversationMessage = {
+      id: "msg-replay",
+      sessionId: "session-1",
+      provider: "internal",
+      role: "agent",
+      content: "replay",
+      timestamp: new Date("2026-03-07T10:00:00.000Z"),
+      metadata: {},
+    };
+    const incrementalMessage: AgentConversationMessage = {
+      id: "msg-live",
+      sessionId: "session-1",
+      provider: "internal",
+      role: "operator",
+      content: "live",
+      timestamp: new Date("2026-03-07T10:00:01.000Z"),
+      metadata: {},
+    };
+
+    messagesService.getReplayMessages.mockResolvedValue([replayMessage]);
+    messagesService.getMessagesAfter
+      .mockResolvedValueOnce([incrementalMessage])
+      .mockResolvedValueOnce([]);
+
+    const iterator = provider.streamMessages("session-1")[Symbol.asyncIterator]();
+
+    const first = await iterator.next();
+    const second = await iterator.next();
+
+    expect(first.done).toBe(false);
+    expect(first.value).toEqual({
+      id: "msg-replay",
+      sessionId: "session-1",
+      role: "assistant",
+      content: "replay",
+      timestamp: new Date("2026-03-07T10:00:00.000Z"),
+      metadata: {},
+    });
+    expect(second.done).toBe(false);
+    expect(second.value).toEqual({
+      id: "msg-live",
+      sessionId: "session-1",
+      role: "user",
+      content: "live",
+      timestamp: new Date("2026-03-07T10:00:01.000Z"),
+      metadata: {},
+    });
+
+    await iterator.return?.();
+
+    expect(messagesService.getReplayMessages).toHaveBeenCalledWith("session-1", 50);
+    expect(messagesService.getMessagesAfter).toHaveBeenCalledWith(
+      "session-1",
+      new Date("2026-03-07T10:00:00.000Z"),
+      "msg-replay"
+    );
+  });
+
+  it("reports provider availability", async () => {
+    await expect(provider.isAvailable()).resolves.toBe(true);
+  });
+});

apps/orchestrator/src/api/agents/internal-agent.provider.ts

@@ -0,0 +1,218 @@
+import { Injectable } from "@nestjs/common";
+import type {
+  AgentMessage,
+  AgentMessageRole,
+  AgentSession,
+  AgentSessionList,
+  AgentSessionStatus,
+  IAgentProvider,
+  InjectResult,
+} from "@mosaic/shared";
+import type { AgentConversationMessage, AgentSessionTree } from "@prisma/client";
+import { AgentControlService } from "./agent-control.service";
+import { AgentMessagesService } from "./agent-messages.service";
+import { AgentTreeService } from "./agent-tree.service";
+
+const DEFAULT_SESSION_LIMIT = 50;
+const DEFAULT_MESSAGE_LIMIT = 50;
+const MAX_MESSAGE_LIMIT = 200;
+const STREAM_POLL_INTERVAL_MS = 1000;
+const INTERNAL_OPERATOR_ID = "internal-provider";
+
+@Injectable()
+export class InternalAgentProvider implements IAgentProvider {
+  readonly providerId = "internal";
+  readonly providerType = "internal";
+  readonly displayName = "Internal Orchestrator";
+
+  constructor(
+    private readonly messagesService: AgentMessagesService,
+    private readonly controlService: AgentControlService,
+    private readonly treeService: AgentTreeService
+  ) {}
+
+  async listSessions(cursor?: string, limit = DEFAULT_SESSION_LIMIT): Promise<AgentSessionList> {
+    const {
+      sessions,
+      total,
+      cursor: nextCursor,
+    } = await this.treeService.listSessions(cursor, limit);
+
+    return {
+      sessions: sessions.map((session) => this.toAgentSession(session)),
+      total,
+      ...(nextCursor !== undefined ? { cursor: nextCursor } : {}),
+    };
+  }
+
+  async getSession(sessionId: string): Promise<AgentSession | null> {
+    const session = await this.treeService.getSession(sessionId);
+    return session ? this.toAgentSession(session) : null;
+  }
+
+  async getMessages(
+    sessionId: string,
+    limit = DEFAULT_MESSAGE_LIMIT,
+    before?: string
+  ): Promise<AgentMessage[]> {
+    const safeLimit = this.normalizeMessageLimit(limit);
+    const skip = this.parseSkip(before);
+
+    const result = await this.messagesService.getMessages(sessionId, safeLimit, skip);
+    return result.messages.map((message) => this.toAgentMessage(message));
+  }
+
+  async injectMessage(sessionId: string, content: string): Promise<InjectResult> {
+    await this.controlService.injectMessage(sessionId, INTERNAL_OPERATOR_ID, content);
+
+    return {
+      accepted: true,
+    };
+  }
+
+  async pauseSession(sessionId: string): Promise<void> {
+    await this.controlService.pauseAgent(sessionId, INTERNAL_OPERATOR_ID);
+  }
+
+  async resumeSession(sessionId: string): Promise<void> {
+    await this.controlService.resumeAgent(sessionId, INTERNAL_OPERATOR_ID);
+  }
+
+  async killSession(sessionId: string, force = true): Promise<void> {
+    await this.controlService.killAgent(sessionId, INTERNAL_OPERATOR_ID, force);
+  }
+
+  async *streamMessages(sessionId: string): AsyncIterable<AgentMessage> {
+    const replayMessages = await this.messagesService.getReplayMessages(
+      sessionId,
+      DEFAULT_MESSAGE_LIMIT
+    );
+
+    let lastSeenTimestamp = new Date();
+    let lastSeenMessageId: string | null = null;
+
+    for (const message of replayMessages) {
+      yield this.toAgentMessage(message);
+      lastSeenTimestamp = message.timestamp;
+      lastSeenMessageId = message.id;
+    }
+
+    for (;;) {
+      const newMessages = await this.messagesService.getMessagesAfter(
+        sessionId,
+        lastSeenTimestamp,
+        lastSeenMessageId
+      );
+
+      for (const message of newMessages) {
+        yield this.toAgentMessage(message);
+        lastSeenTimestamp = message.timestamp;
+        lastSeenMessageId = message.id;
+      }
+
+      await this.delay(STREAM_POLL_INTERVAL_MS);
+    }
+  }
+
+  isAvailable(): Promise<boolean> {
+    return Promise.resolve(true);
+  }
+
+  private toAgentSession(session: AgentSessionTree): AgentSession {
+    const metadata = this.toMetadata(session.metadata);
+
+    return {
+      id: session.sessionId,
+      providerId: this.providerId,
+      providerType: this.providerType,
+      ...(session.taskId !== null ? { label: session.taskId } : {}),
+      status: this.toSessionStatus(session.status),
+      ...(session.parentSessionId !== null ? { parentSessionId: session.parentSessionId } : {}),
+      createdAt: session.spawnedAt,
+      updatedAt: session.completedAt ?? session.spawnedAt,
+      ...(metadata !== undefined ? { metadata } : {}),
+    };
+  }
+
+  private toAgentMessage(message: AgentConversationMessage): AgentMessage {
+    const metadata = this.toMetadata(message.metadata);
+
+    return {
+      id: message.id,
+      sessionId: message.sessionId,
+      role: this.toMessageRole(message.role),
+      content: message.content,
+      timestamp: message.timestamp,
+      ...(metadata !== undefined ? { metadata } : {}),
+    };
+  }
+
+  private toSessionStatus(status: string): AgentSessionStatus {
+    switch (status) {
+      case "running":
+        return "active";
+      case "paused":
+        return "paused";
+      case "completed":
+        return "completed";
+      case "failed":
+      case "killed":
+        return "failed";
+      case "spawning":
+      default:
+        return "idle";
+    }
+  }
+
+  private toMessageRole(role: string): AgentMessageRole {
+    switch (role) {
+      case "agent":
+      case "assistant":
+        return "assistant";
+      case "system":
+        return "system";
+      case "tool":
+        return "tool";
+      case "operator":
+      case "user":
+      default:
+        return "user";
+    }
+  }
+
+  private normalizeMessageLimit(limit: number): number {
+    const normalized = Number.isFinite(limit) ? Math.trunc(limit) : DEFAULT_MESSAGE_LIMIT;
+    if (normalized < 1) {
+      return 1;
+    }
+
+    return Math.min(normalized, MAX_MESSAGE_LIMIT);
+  }
+
+  private parseSkip(before?: string): number {
+    if (!before) {
+      return 0;
+    }
+
+    const parsed = Number.parseInt(before, 10);
+    if (Number.isNaN(parsed) || parsed < 0) {
+      return 0;
+    }
+
+    return parsed;
+  }
+
+  private toMetadata(value: unknown): Record<string, unknown> | undefined {
+    if (value !== null && typeof value === "object" && !Array.isArray(value)) {
+      return value as Record<string, unknown>;
+    }
+
+    return undefined;
+  }
+
+  private async delay(ms: number): Promise<void> {
+    await new Promise((resolve) => {
+      setTimeout(resolve, ms);
+    });
+  }
+}

apps/orchestrator/src/api/mission-control/dto/get-mission-control-audit-log-query.dto.ts

@@ -0,0 +1,21 @@
+import { Type } from "class-transformer";
+import { IsInt, IsOptional, IsString, Max, Min } from "class-validator";
+
+export class GetMissionControlAuditLogQueryDto {
+  @IsOptional()
+  @IsString()
+  sessionId?: string;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  page = 1;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(200)
+  limit = 50;
+}

apps/orchestrator/src/api/mission-control/dto/get-mission-control-messages-query.dto.ts

@@ -0,0 +1,15 @@
+import { Type } from "class-transformer";
+import { IsInt, IsOptional, IsString, Max, Min } from "class-validator";
+
+export class GetMissionControlMessagesQueryDto {
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(200)
+  limit?: number;
+
+  @IsOptional()
+  @IsString()
+  before?: string;
+}

apps/orchestrator/src/api/mission-control/dto/kill-session.dto.ts

@@ -0,0 +1,7 @@
+import { IsBoolean, IsOptional } from "class-validator";
+
+export class KillSessionDto {
+  @IsOptional()
+  @IsBoolean()
+  force?: boolean;
+}

apps/orchestrator/src/api/mission-control/mission-control.controller.spec.ts

@@ -0,0 +1,67 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { AgentSession } from "@mosaic/shared";
+import type { PrismaService } from "../../prisma/prisma.service";
+import { AgentProviderRegistry } from "../agents/agent-provider.registry";
+import { MissionControlController } from "./mission-control.controller";
+import { MissionControlService } from "./mission-control.service";
+
+describe("MissionControlController", () => {
+  let controller: MissionControlController;
+  let registry: {
+    listAllSessions: ReturnType<typeof vi.fn>;
+    getProviderForSession: ReturnType<typeof vi.fn>;
+  };
+
+  beforeEach(() => {
+    registry = {
+      listAllSessions: vi.fn(),
+      getProviderForSession: vi.fn(),
+    };
+
+    const prisma = {
+      operatorAuditLog: {
+        create: vi.fn().mockResolvedValue(undefined),
+      },
+    };
+
+    const service = new MissionControlService(
+      registry as unknown as AgentProviderRegistry,
+      prisma as unknown as PrismaService
+    );
+
+    controller = new MissionControlController(service);
+  });
+
+  it("Phase 1 gate: unified sessions endpoint returns internal provider sessions", async () => {
+    const internalSession: AgentSession = {
+      id: "session-internal-1",
+      providerId: "internal",
+      providerType: "internal",
+      status: "active",
+      createdAt: new Date("2026-03-07T20:00:00.000Z"),
+      updatedAt: new Date("2026-03-07T20:01:00.000Z"),
+    };
+
+    const externalSession: AgentSession = {
+      id: "session-openclaw-1",
+      providerId: "openclaw",
+      providerType: "external",
+      status: "active",
+      createdAt: new Date("2026-03-07T20:02:00.000Z"),
+      updatedAt: new Date("2026-03-07T20:03:00.000Z"),
+    };
+
+    registry.listAllSessions.mockResolvedValue([internalSession, externalSession]);
+
+    const response = await controller.listSessions();
+
+    expect(registry.listAllSessions).toHaveBeenCalledTimes(1);
+    expect(response.sessions).toEqual([internalSession, externalSession]);
+    expect(response.sessions).toContainEqual(
+      expect.objectContaining({
+        id: "session-internal-1",
+        providerId: "internal",
+      })
+    );
+  });
+});

apps/orchestrator/src/api/mission-control/mission-control.controller.ts

@@ -0,0 +1,192 @@
+import {
+  Body,
+  Controller,
+  Get,
+  Header,
+  HttpCode,
+  MessageEvent,
+  Param,
+  Post,
+  Query,
+  Request,
+  Sse,
+  UseGuards,
+  UsePipes,
+  ValidationPipe,
+} from "@nestjs/common";
+import type { AgentMessage, AgentSession, InjectResult } from "@mosaic/shared";
+import { Observable } from "rxjs";
+import { AuthGuard } from "../../auth/guards/auth.guard";
+import { InjectAgentDto } from "../agents/dto/inject-agent.dto";
+import { GetMissionControlAuditLogQueryDto } from "./dto/get-mission-control-audit-log-query.dto";
+import { GetMissionControlMessagesQueryDto } from "./dto/get-mission-control-messages-query.dto";
+import { KillSessionDto } from "./dto/kill-session.dto";
+import { MissionControlService, type MissionControlAuditLogPage } from "./mission-control.service";
+
+const DEFAULT_OPERATOR_ID = "mission-control";
+
+interface MissionControlRequest {
+  user?: {
+    id?: string;
+  };
+}
+
+@Controller("api/mission-control")
+@UseGuards(AuthGuard)
+export class MissionControlController {
+  constructor(private readonly missionControlService: MissionControlService) {}
+
+  @Get("sessions")
+  async listSessions(): Promise<{ sessions: AgentSession[] }> {
+    const sessions = await this.missionControlService.listSessions();
+    return { sessions };
+  }
+
+  @Get("sessions/:sessionId")
+  getSession(@Param("sessionId") sessionId: string): Promise<AgentSession> {
+    return this.missionControlService.getSession(sessionId);
+  }
+
+  @Get("sessions/:sessionId/messages")
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async getMessages(
+    @Param("sessionId") sessionId: string,
+    @Query() query: GetMissionControlMessagesQueryDto
+  ): Promise<{ messages: AgentMessage[] }> {
+    const messages = await this.missionControlService.getMessages(
+      sessionId,
+      query.limit,
+      query.before
+    );
+
+    return { messages };
+  }
+
+  @Get("audit-log")
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  getAuditLog(
+    @Query() query: GetMissionControlAuditLogQueryDto
+  ): Promise<MissionControlAuditLogPage> {
+    return this.missionControlService.getAuditLog(query.sessionId, query.page, query.limit);
+  }
+
+  @Post("sessions/:sessionId/inject")
+  @HttpCode(200)
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  injectMessage(
+    @Param("sessionId") sessionId: string,
+    @Body() dto: InjectAgentDto,
+    @Request() req: MissionControlRequest
+  ): Promise<InjectResult> {
+    return this.missionControlService.injectMessage(
+      sessionId,
+      dto.message,
+      this.resolveOperatorId(req)
+    );
+  }
+
+  @Post("sessions/:sessionId/pause")
+  @HttpCode(200)
+  async pauseSession(
+    @Param("sessionId") sessionId: string,
+    @Request() req: MissionControlRequest
+  ): Promise<{ message: string }> {
+    await this.missionControlService.pauseSession(sessionId, this.resolveOperatorId(req));
+
+    return { message: `Session ${sessionId} paused` };
+  }
+
+  @Post("sessions/:sessionId/resume")
+  @HttpCode(200)
+  async resumeSession(
+    @Param("sessionId") sessionId: string,
+    @Request() req: MissionControlRequest
+  ): Promise<{ message: string }> {
+    await this.missionControlService.resumeSession(sessionId, this.resolveOperatorId(req));
+
+    return { message: `Session ${sessionId} resumed` };
+  }
+
+  @Post("sessions/:sessionId/kill")
+  @HttpCode(200)
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  async killSession(
+    @Param("sessionId") sessionId: string,
+    @Body() dto: KillSessionDto,
+    @Request() req: MissionControlRequest
+  ): Promise<{ message: string }> {
+    await this.missionControlService.killSession(
+      sessionId,
+      dto.force ?? true,
+      this.resolveOperatorId(req)
+    );
+
+    return { message: `Session ${sessionId} killed` };
+  }
+
+  @Sse("sessions/:sessionId/stream")
+  @Header("Content-Type", "text/event-stream")
+  @Header("Cache-Control", "no-cache")
+  streamSessionMessages(@Param("sessionId") sessionId: string): Observable<MessageEvent> {
+    return new Observable<MessageEvent>((subscriber) => {
+      let isClosed = false;
+      let iterator: AsyncIterator<AgentMessage> | null = null;
+
+      void this.missionControlService
+        .streamMessages(sessionId)
+        .then(async (stream) => {
+          iterator = stream[Symbol.asyncIterator]();
+
+          for (;;) {
+            if (isClosed) {
+              break;
+            }
+
+            const next = (await iterator.next()) as { done: boolean; value: AgentMessage };
+            if (next.done) {
+              break;
+            }
+
+            subscriber.next({
+              data: this.toStreamPayload(next.value),
+            });
+          }
+
+          subscriber.complete();
+        })
+        .catch((error: unknown) => {
+          subscriber.error(error);
+        });
+
+      return () => {
+        isClosed = true;
+        void iterator?.return?.();
+      };
+    });
+  }
+
+  private resolveOperatorId(req: MissionControlRequest): string {
+    const operatorId = req.user?.id;
+    return typeof operatorId === "string" && operatorId.length > 0
+      ? operatorId
+      : DEFAULT_OPERATOR_ID;
+  }
+
+  private toStreamPayload(message: AgentMessage): {
+    id: string;
+    sessionId: string;
+    role: string;
+    content: string;
+    timestamp: string;
+    metadata?: Record<string, unknown>;
+  } {
+    return {
+      id: message.id,
+      sessionId: message.sessionId,
+      role: message.role,
+      content: message.content,
+      timestamp: message.timestamp.toISOString(),
+      ...(message.metadata !== undefined ? { metadata: message.metadata } : {}),
+    };
+  }
+}

apps/orchestrator/src/api/mission-control/mission-control.module.ts

@@ -0,0 +1,13 @@
+import { Module } from "@nestjs/common";
+import { AgentsModule } from "../agents/agents.module";
+import { AuthModule } from "../../auth/auth.module";
+import { PrismaModule } from "../../prisma/prisma.module";
+import { MissionControlController } from "./mission-control.controller";
+import { MissionControlService } from "./mission-control.service";
+
+@Module({
+  imports: [AgentsModule, AuthModule, PrismaModule],
+  controllers: [MissionControlController],
+  providers: [MissionControlService],
+})
+export class MissionControlModule {}

apps/orchestrator/src/api/mission-control/mission-control.service.spec.ts

@@ -0,0 +1,213 @@
+import { NotFoundException } from "@nestjs/common";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { AgentMessage, AgentSession, IAgentProvider, InjectResult } from "@mosaic/shared";
+import type { PrismaService } from "../../prisma/prisma.service";
+import { AgentProviderRegistry } from "../agents/agent-provider.registry";
+import { MissionControlService } from "./mission-control.service";
+
+type MockProvider = IAgentProvider & {
+  listSessions: ReturnType<typeof vi.fn>;
+  getSession: ReturnType<typeof vi.fn>;
+  getMessages: ReturnType<typeof vi.fn>;
+  injectMessage: ReturnType<typeof vi.fn>;
+  pauseSession: ReturnType<typeof vi.fn>;
+  resumeSession: ReturnType<typeof vi.fn>;
+  killSession: ReturnType<typeof vi.fn>;
+  streamMessages: ReturnType<typeof vi.fn>;
+};
+
+const emptyMessageStream = async function* (): AsyncIterable<AgentMessage> {
+  return;
+};
+
+const createProvider = (providerId = "internal"): MockProvider => ({
+  providerId,
+  providerType: providerId,
+  displayName: providerId,
+  listSessions: vi.fn().mockResolvedValue({ sessions: [], total: 0 }),
+  getSession: vi.fn().mockResolvedValue(null),
+  getMessages: vi.fn().mockResolvedValue([]),
+  injectMessage: vi.fn().mockResolvedValue({ accepted: true } as InjectResult),
+  pauseSession: vi.fn().mockResolvedValue(undefined),
+  resumeSession: vi.fn().mockResolvedValue(undefined),
+  killSession: vi.fn().mockResolvedValue(undefined),
+  streamMessages: vi.fn().mockReturnValue(emptyMessageStream()),
+  isAvailable: vi.fn().mockResolvedValue(true),
+});
+
+describe("MissionControlService", () => {
+  let service: MissionControlService;
+  let registry: {
+    listAllSessions: ReturnType<typeof vi.fn>;
+    getProviderForSession: ReturnType<typeof vi.fn>;
+  };
+  let prisma: {
+    operatorAuditLog: {
+      create: ReturnType<typeof vi.fn>;
+    };
+  };
+
+  const session: AgentSession = {
+    id: "session-1",
+    providerId: "internal",
+    providerType: "internal",
+    status: "active",
+    createdAt: new Date("2026-03-07T14:00:00.000Z"),
+    updatedAt: new Date("2026-03-07T14:01:00.000Z"),
+  };
+
+  beforeEach(() => {
+    registry = {
+      listAllSessions: vi.fn().mockResolvedValue([session]),
+      getProviderForSession: vi.fn().mockResolvedValue(null),
+    };
+
+    prisma = {
+      operatorAuditLog: {
+        create: vi.fn().mockResolvedValue(undefined),
+      },
+    };
+
+    service = new MissionControlService(
+      registry as unknown as AgentProviderRegistry,
+      prisma as unknown as PrismaService
+    );
+  });
+
+  it("lists sessions from the registry", async () => {
+    await expect(service.listSessions()).resolves.toEqual([session]);
+    expect(registry.listAllSessions).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns a session when it is found", async () => {
+    const provider = createProvider("internal");
+    registry.getProviderForSession.mockResolvedValue({ provider, session });
+
+    await expect(service.getSession(session.id)).resolves.toEqual(session);
+  });
+
+  it("throws NotFoundException when session lookup fails", async () => {
+    await expect(service.getSession("missing-session")).rejects.toBeInstanceOf(NotFoundException);
+  });
+
+  it("gets messages from the resolved provider", async () => {
+    const provider = createProvider("openclaw");
+    const messages: AgentMessage[] = [
+      {
+        id: "message-1",
+        sessionId: session.id,
+        role: "assistant",
+        content: "hello",
+        timestamp: new Date("2026-03-07T14:01:00.000Z"),
+      },
+    ];
+
+    provider.getMessages.mockResolvedValue(messages);
+    registry.getProviderForSession.mockResolvedValue({ provider, session });
+
+    await expect(service.getMessages(session.id, 25, "10")).resolves.toEqual(messages);
+    expect(provider.getMessages).toHaveBeenCalledWith(session.id, 25, "10");
+  });
+
+  it("injects a message and writes an audit log", async () => {
+    const provider = createProvider("internal");
+    const injectResult: InjectResult = { accepted: true, messageId: "msg-1" };
+    provider.injectMessage.mockResolvedValue(injectResult);
+    registry.getProviderForSession.mockResolvedValue({ provider, session });
+
+    await expect(service.injectMessage(session.id, "ship it", "operator-1")).resolves.toEqual(
+      injectResult
+    );
+
+    expect(provider.injectMessage).toHaveBeenCalledWith(session.id, "ship it");
+    expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+      data: {
+        sessionId: session.id,
+        userId: "operator-1",
+        provider: "internal",
+        action: "inject",
+        content: "ship it",
+        metadata: {
+          payload: { message: "ship it" },
+        },
+      },
+    });
+  });
+
+  it("pauses and resumes using default operator id", async () => {
+    const provider = createProvider("openclaw");
+    registry.getProviderForSession.mockResolvedValue({ provider, session });
+
+    await service.pauseSession(session.id);
+    await service.resumeSession(session.id);
+
+    expect(provider.pauseSession).toHaveBeenCalledWith(session.id);
+    expect(provider.resumeSession).toHaveBeenCalledWith(session.id);
+    expect(prisma.operatorAuditLog.create).toHaveBeenNthCalledWith(1, {
+      data: {
+        sessionId: session.id,
+        userId: "mission-control",
+        provider: "openclaw",
+        action: "pause",
+        metadata: {
+          payload: {},
+        },
+      },
+    });
+    expect(prisma.operatorAuditLog.create).toHaveBeenNthCalledWith(2, {
+      data: {
+        sessionId: session.id,
+        userId: "mission-control",
+        provider: "openclaw",
+        action: "resume",
+        metadata: {
+          payload: {},
+        },
+      },
+    });
+  });
+
+  it("kills with provided force value and writes audit log", async () => {
+    const provider = createProvider("openclaw");
+    registry.getProviderForSession.mockResolvedValue({ provider, session });
+
+    await service.killSession(session.id, false, "operator-2");
+
+    expect(provider.killSession).toHaveBeenCalledWith(session.id, false);
+    expect(prisma.operatorAuditLog.create).toHaveBeenCalledWith({
+      data: {
+        sessionId: session.id,
+        userId: "operator-2",
+        provider: "openclaw",
+        action: "kill",
+        metadata: {
+          payload: { force: false },
+        },
+      },
+    });
+  });
+
+  it("resolves provider message stream", async () => {
+    const provider = createProvider("internal");
+    const messageStream = (async function* (): AsyncIterable<AgentMessage> {
+      yield {
+        id: "message-1",
+        sessionId: session.id,
+        role: "assistant",
+        content: "stream",
+        timestamp: new Date("2026-03-07T14:03:00.000Z"),
+      };
+    })();
+
+    provider.streamMessages.mockReturnValue(messageStream);
+    registry.getProviderForSession.mockResolvedValue({ provider, session });
+
+    await expect(service.streamMessages(session.id)).resolves.toBe(messageStream);
+    expect(provider.streamMessages).toHaveBeenCalledWith(session.id);
+  });
+
+  it("does not write audit log when session cannot be resolved", async () => {
+    await expect(service.pauseSession("missing-session")).rejects.toBeInstanceOf(NotFoundException);
+    expect(prisma.operatorAuditLog.create).not.toHaveBeenCalled();
+  });
+});

apps/orchestrator/src/api/mission-control/mission-control.service.ts

@@ -0,0 +1,186 @@
+import { Injectable, NotFoundException } from "@nestjs/common";
+import type { AgentMessage, AgentSession, IAgentProvider, InjectResult } from "@mosaic/shared";
+import type { Prisma } from "@prisma/client";
+import { PrismaService } from "../../prisma/prisma.service";
+import { AgentProviderRegistry } from "../agents/agent-provider.registry";
+
+type MissionControlAction = "inject" | "pause" | "resume" | "kill";
+
+const DEFAULT_OPERATOR_ID = "mission-control";
+
+export interface AuditLogEntry {
+  id: string;
+  userId: string;
+  sessionId: string;
+  provider: string;
+  action: string;
+  content: string | null;
+  metadata: Prisma.JsonValue;
+  createdAt: Date;
+}
+
+export interface MissionControlAuditLogPage {
+  items: AuditLogEntry[];
+  total: number;
+  page: number;
+  pages: number;
+}
+
+@Injectable()
+export class MissionControlService {
+  constructor(
+    private readonly registry: AgentProviderRegistry,
+    private readonly prisma: PrismaService
+  ) {}
+
+  listSessions(): Promise<AgentSession[]> {
+    return this.registry.listAllSessions();
+  }
+
+  async getSession(sessionId: string): Promise<AgentSession> {
+    const resolved = await this.registry.getProviderForSession(sessionId);
+    if (!resolved) {
+      throw new NotFoundException(`Session ${sessionId} not found`);
+    }
+
+    return resolved.session;
+  }
+
+  async getMessages(sessionId: string, limit?: number, before?: string): Promise<AgentMessage[]> {
+    const { provider } = await this.getProviderForSessionOrThrow(sessionId);
+    return provider.getMessages(sessionId, limit, before);
+  }
+
+  async getAuditLog(
+    sessionId: string | undefined,
+    page: number,
+    limit: number
+  ): Promise<MissionControlAuditLogPage> {
+    const normalizedSessionId = sessionId?.trim();
+    const where: Prisma.OperatorAuditLogWhereInput =
+      normalizedSessionId && normalizedSessionId.length > 0
+        ? { sessionId: normalizedSessionId }
+        : {};
+
+    const [total, items] = await this.prisma.$transaction([
+      this.prisma.operatorAuditLog.count({ where }),
+      this.prisma.operatorAuditLog.findMany({
+        where,
+        orderBy: { createdAt: "desc" },
+        skip: (page - 1) * limit,
+        take: limit,
+      }),
+    ]);
+
+    return {
+      items,
+      total,
+      page,
+      pages: total === 0 ? 0 : Math.ceil(total / limit),
+    };
+  }
+
+  async injectMessage(
+    sessionId: string,
+    message: string,
+    operatorId = DEFAULT_OPERATOR_ID
+  ): Promise<InjectResult> {
+    const { provider } = await this.getProviderForSessionOrThrow(sessionId);
+    const result = await provider.injectMessage(sessionId, message);
+
+    await this.writeOperatorAuditLog({
+      sessionId,
+      providerId: provider.providerId,
+      operatorId,
+      action: "inject",
+      content: message,
+      payload: { message },
+    });
+
+    return result;
+  }
+
+  async pauseSession(sessionId: string, operatorId = DEFAULT_OPERATOR_ID): Promise<void> {
+    const { provider } = await this.getProviderForSessionOrThrow(sessionId);
+    await provider.pauseSession(sessionId);
+
+    await this.writeOperatorAuditLog({
+      sessionId,
+      providerId: provider.providerId,
+      operatorId,
+      action: "pause",
+      payload: {},
+    });
+  }
+
+  async resumeSession(sessionId: string, operatorId = DEFAULT_OPERATOR_ID): Promise<void> {
+    const { provider } = await this.getProviderForSessionOrThrow(sessionId);
+    await provider.resumeSession(sessionId);
+
+    await this.writeOperatorAuditLog({
+      sessionId,
+      providerId: provider.providerId,
+      operatorId,
+      action: "resume",
+      payload: {},
+    });
+  }
+
+  async killSession(
+    sessionId: string,
+    force = true,
+    operatorId = DEFAULT_OPERATOR_ID
+  ): Promise<void> {
+    const { provider } = await this.getProviderForSessionOrThrow(sessionId);
+    await provider.killSession(sessionId, force);
+
+    await this.writeOperatorAuditLog({
+      sessionId,
+      providerId: provider.providerId,
+      operatorId,
+      action: "kill",
+      payload: { force },
+    });
+  }
+
+  async streamMessages(sessionId: string): Promise<AsyncIterable<AgentMessage>> {
+    const { provider } = await this.getProviderForSessionOrThrow(sessionId);
+    return provider.streamMessages(sessionId);
+  }
+
+  private async getProviderForSessionOrThrow(
+    sessionId: string
+  ): Promise<{ provider: IAgentProvider; session: AgentSession }> {
+    const resolved = await this.registry.getProviderForSession(sessionId);
+
+    if (!resolved) {
+      throw new NotFoundException(`Session ${sessionId} not found`);
+    }
+
+    return resolved;
+  }
+
+  private toJsonValue(value: Record<string, unknown>): Prisma.InputJsonValue {
+    return value as Prisma.InputJsonValue;
+  }
+
+  private async writeOperatorAuditLog(params: {
+    sessionId: string;
+    providerId: string;
+    operatorId: string;
+    action: MissionControlAction;
+    content?: string;
+    payload: Record<string, unknown>;
+  }): Promise<void> {
+    await this.prisma.operatorAuditLog.create({
+      data: {
+        sessionId: params.sessionId,
+        userId: params.operatorId,
+        provider: params.providerId,
+        action: params.action,
+        ...(params.content !== undefined ? { content: params.content } : {}),
+        metadata: this.toJsonValue({ payload: params.payload }),
+      },
+    });
+  }
+}

apps/orchestrator/src/app.module.ts

@@ -4,7 +4,9 @@ import { BullModule } from "@nestjs/bullmq";
 import { ThrottlerModule } from "@nestjs/throttler";
 import { HealthModule } from "./api/health/health.module";
 import { AgentsModule } from "./api/agents/agents.module";
+import { MissionControlModule } from "./api/mission-control/mission-control.module";
 import { QueueApiModule } from "./api/queue/queue-api.module";
+import { AgentProvidersModule } from "./api/agent-providers/agent-providers.module";
 import { CoordinatorModule } from "./coordinator/coordinator.module";
 import { BudgetModule } from "./budget/budget.module";
 import { CIModule } from "./ci";
@@ -51,6 +53,8 @@ import { orchestratorConfig } from "./config/orchestrator.config";
     ]),
     HealthModule,
     AgentsModule,
+    AgentProvidersModule,
+    MissionControlModule,
     QueueApiModule,
     CoordinatorModule,
     BudgetModule,

apps/orchestrator/src/auth/auth.module.ts

@@ -0,0 +1,9 @@
+import { Module } from "@nestjs/common";
+import { OrchestratorApiKeyGuard } from "../common/guards/api-key.guard";
+import { AuthGuard } from "./guards/auth.guard";
+
+@Module({
+  providers: [OrchestratorApiKeyGuard, AuthGuard],
+  exports: [AuthGuard],
+})
+export class AuthModule {}

apps/orchestrator/src/auth/guards/auth.guard.ts

@@ -0,0 +1,11 @@
+import { CanActivate, ExecutionContext, Injectable } from "@nestjs/common";
+import { OrchestratorApiKeyGuard } from "../../common/guards/api-key.guard";
+
+@Injectable()
+export class AuthGuard implements CanActivate {
+  constructor(private readonly apiKeyGuard: OrchestratorApiKeyGuard) {}
+
+  canActivate(context: ExecutionContext): boolean | Promise<boolean> {
+    return this.apiKeyGuard.canActivate(context);
+  }
+}

apps/orchestrator/src/spawner/agent-spawner.service.ts

@@ -115,7 +115,13 @@ export class AgentSpawnerService implements OnModuleDestroy {
     }
 
     void this.agentIngestionService
-      .recordAgentSpawned(agentId, undefined, undefined, request.taskId, request.agentType)
+      .recordAgentSpawned(
+        agentId,
+        request.parentAgentId,
+        undefined,
+        request.taskId,
+        request.agentType
+      )
       .catch((error: unknown) => {
         const errorMessage = error instanceof Error ? error.message : String(error);
         this.logger.error(`Failed to record spawned ingestion for ${agentId}: ${errorMessage}`);

apps/orchestrator/src/spawner/types/agent-spawner.types.ts

@@ -40,6 +40,8 @@ export interface SpawnAgentOptions {
 export interface SpawnAgentRequest {
   /** Unique task identifier */
   taskId: string;
+  /** Optional parent session identifier for subagent lineage */
+  parentAgentId?: string;
   /** Type of agent to spawn */
   agentType: AgentType;
   /** Context for task execution */

apps/web/src/app/(authenticated)/kanban/page.test.tsx

@@ -132,7 +132,7 @@ describe("KanbanPage add task flow", (): void => {
     });
 
     // Click the "+ Add task" button in the To Do column
-    const addTaskButtons = screen.getAllByRole("button", { name: /\+ Add task/i });
+    const addTaskButtons = await screen.findAllByRole("button", { name: /\+ Add task/i });
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
     await user.click(addTaskButtons[0]!); // First column is "To Do"
 
@@ -165,7 +165,7 @@ describe("KanbanPage add task flow", (): void => {
     });
 
     // Click the "+ Add task" button
-    const addTaskButtons = screen.getAllByRole("button", { name: /\+ Add task/i });
+    const addTaskButtons = await screen.findAllByRole("button", { name: /\+ Add task/i });
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
     await user.click(addTaskButtons[0]!);
 

apps/web/src/app/(authenticated)/mission-control/page.tsx

@@ -0,0 +1,5 @@
+import { MissionControlLayout } from "@/components/mission-control/MissionControlLayout";
+
+export default function MissionControlPage(): React.JSX.Element {
+  return <MissionControlLayout />;
+}

apps/web/src/components/layout/AppSidebar.tsx

@@ -156,6 +156,26 @@ function IconTerminal(): React.JSX.Element {
   );
 }
 
+function IconMissionControl(): React.JSX.Element {
+  return (
+    <svg
+      width="16"
+      height="16"
+      viewBox="0 0 16 16"
+      fill="none"
+      stroke="currentColor"
+      strokeWidth="1.5"
+      aria-hidden="true"
+    >
+      <circle cx="8" cy="8" r="1.5" />
+      <path d="M11 5a4.25 4.25 0 0 1 0 6" />
+      <path d="M5 5a4.25 4.25 0 0 0 0 6" />
+      <path d="M13.5 2.5a7.75 7.75 0 0 1 0 11" />
+      <path d="M2.5 2.5a7.75 7.75 0 0 0 0 11" />
+    </svg>
+  );
+}
+
 function IconSettings(): React.JSX.Element {
   return (
     <svg
@@ -260,6 +280,11 @@ const NAV_GROUPS: NavGroup[] = [
         label: "Terminal",
         icon: <IconTerminal />,
       },
+      {
+        href: "/mission-control",
+        label: "Mission Control",
+        icon: <IconMissionControl />,
+      },
     ],
   },
   {

apps/web/src/components/mission-control/AuditLogDrawer.test.tsx

@@ -0,0 +1,205 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import type { ButtonHTMLAttributes, HTMLAttributes, ReactNode } from "react";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+interface MockBadgeProps extends HTMLAttributes<HTMLElement> {
+  children: ReactNode;
+}
+
+interface AuditLogEntry {
+  id: string;
+  userId: string;
+  sessionId: string;
+  provider: string;
+  action: string;
+  content: string | null;
+  metadata: unknown;
+  createdAt: string;
+}
+
+interface AuditLogResponse {
+  items: AuditLogEntry[];
+  total: number;
+  page: number;
+  pages: number;
+}
+
+const mockApiGet = vi.fn<(endpoint: string) => Promise<AuditLogResponse>>();
+
+vi.mock("@/lib/api/client", () => ({
+  apiGet: (endpoint: string): Promise<AuditLogResponse> => mockApiGet(endpoint),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+vi.mock("@/components/ui/badge", () => ({
+  Badge: ({ children, ...props }: MockBadgeProps): React.JSX.Element => (
+    <span {...props}>{children}</span>
+  ),
+}));
+
+import { AuditLogDrawer } from "./AuditLogDrawer";
+
+function renderWithQueryClient(ui: React.JSX.Element): ReturnType<typeof render> {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+
+  return render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+function responseWith(items: AuditLogEntry[], page: number, pages: number): AuditLogResponse {
+  return {
+    items,
+    total: items.length,
+    page,
+    pages,
+  };
+}
+
+describe("AuditLogDrawer", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    mockApiGet.mockResolvedValue(responseWith([], 1, 0));
+  });
+
+  it("opens from trigger text and renders empty state", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    renderWithQueryClient(<AuditLogDrawer trigger="Audit" />);
+
+    await user.click(screen.getByRole("button", { name: "Audit" }));
+
+    await waitFor((): void => {
+      expect(screen.getByText("Audit Log")).toBeInTheDocument();
+      expect(screen.getByText("No audit entries found.")).toBeInTheDocument();
+    });
+  });
+
+  it("renders audit entries with action, session id, and payload", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    mockApiGet.mockResolvedValue(
+      responseWith(
+        [
+          {
+            id: "entry-1",
+            userId: "operator-1",
+            sessionId: "1234567890abcdef",
+            provider: "internal",
+            action: "inject",
+            content: "Run diagnostics",
+            metadata: { payload: { ignored: true } },
+            createdAt: "2026-03-07T19:00:00.000Z",
+          },
+        ],
+        1,
+        1
+      )
+    );
+
+    renderWithQueryClient(<AuditLogDrawer trigger="Audit" />);
+
+    await user.click(screen.getByRole("button", { name: "Audit" }));
+
+    await waitFor((): void => {
+      expect(screen.getByText("inject")).toBeInTheDocument();
+      expect(screen.getByText("12345678")).toBeInTheDocument();
+      expect(screen.getByText("Run diagnostics")).toBeInTheDocument();
+    });
+  });
+
+  it("supports pagination and metadata payload summary", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    mockApiGet.mockImplementation((endpoint: string): Promise<AuditLogResponse> => {
+      const query = endpoint.split("?")[1] ?? "";
+      const params = new URLSearchParams(query);
+      const page = Number(params.get("page") ?? "1");
+
+      if (page === 1) {
+        return Promise.resolve({
+          items: [
+            {
+              id: "entry-page-1",
+              userId: "operator-2",
+              sessionId: "abcdefgh12345678",
+              provider: "internal",
+              action: "pause",
+              content: "",
+              metadata: { payload: { reason: "hold" } },
+              createdAt: "2026-03-07T19:01:00.000Z",
+            },
+          ],
+          total: 2,
+          page: 1,
+          pages: 2,
+        });
+      }
+
+      return Promise.resolve({
+        items: [
+          {
+            id: "entry-page-2",
+            userId: "operator-3",
+            sessionId: "zzzz111122223333",
+            provider: "internal",
+            action: "kill",
+            content: null,
+            metadata: { payload: { force: true } },
+            createdAt: "2026-03-07T19:02:00.000Z",
+          },
+        ],
+        total: 2,
+        page: 2,
+        pages: 2,
+      });
+    });
+
+    renderWithQueryClient(<AuditLogDrawer trigger="Audit" />);
+
+    await user.click(screen.getByRole("button", { name: "Audit" }));
+
+    await waitFor((): void => {
+      expect(screen.getByText("Page 1 of 2")).toBeInTheDocument();
+      expect(screen.getByText("reason=hold")).toBeInTheDocument();
+    });
+
+    await user.click(screen.getByRole("button", { name: "Next" }));
+
+    await waitFor((): void => {
+      expect(screen.getByText("Page 2 of 2")).toBeInTheDocument();
+      expect(screen.getByText("force=true")).toBeInTheDocument();
+    });
+  });
+
+  it("includes sessionId filter in query string", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    renderWithQueryClient(<AuditLogDrawer trigger="Audit" sessionId="session 7" />);
+
+    await user.click(screen.getByRole("button", { name: "Audit" }));
+
+    await waitFor((): void => {
+      expect(mockApiGet).toHaveBeenCalled();
+    });
+
+    const firstCall = mockApiGet.mock.calls[0];
+    const endpoint = firstCall?.[0] ?? "";
+
+    expect(endpoint).toContain("sessionId=session+7");
+  });
+});

apps/web/src/components/mission-control/AuditLogDrawer.tsx

@@ -0,0 +1,322 @@
+"use client";
+
+import { isValidElement, useEffect, useMemo, useState } from "react";
+import type { ReactNode } from "react";
+import { format } from "date-fns";
+import { useQuery } from "@tanstack/react-query";
+import { Loader2 } from "lucide-react";
+import { Badge } from "@/components/ui/badge";
+import type { BadgeVariant } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import {
+  Sheet,
+  SheetContent,
+  SheetDescription,
+  SheetHeader,
+  SheetTitle,
+  SheetTrigger,
+} from "@/components/ui/sheet";
+import { apiGet } from "@/lib/api/client";
+
+const AUDIT_LOG_REFRESH_INTERVAL_MS = 10_000;
+const AUDIT_LOG_PAGE_SIZE = 50;
+const SUMMARY_MAX_LENGTH = 120;
+
+interface AuditLogDrawerProps {
+  sessionId?: string;
+  trigger: ReactNode;
+}
+
+interface AuditLogEntry {
+  id: string;
+  userId: string;
+  sessionId: string;
+  provider: string;
+  action: string;
+  content: string | null;
+  metadata: unknown;
+  createdAt: string;
+}
+
+interface AuditLogResponse {
+  items: AuditLogEntry[];
+  total: number;
+  page: number;
+  pages: number;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
+function truncateText(value: string, maxLength: number): string {
+  if (value.length <= maxLength) {
+    return value;
+  }
+
+  return `${value.slice(0, maxLength - 1)}…`;
+}
+
+function truncateSessionId(sessionId: string): string {
+  return sessionId.slice(0, 8);
+}
+
+function formatTimestamp(value: string): string {
+  const parsed = new Date(value);
+
+  if (Number.isNaN(parsed.getTime())) {
+    return "Unknown";
+  }
+
+  return format(parsed, "yyyy-MM-dd HH:mm:ss");
+}
+
+function stringifyPayloadValue(value: unknown): string {
+  if (typeof value === "string") {
+    return value;
+  }
+
+  if (typeof value === "number" || typeof value === "boolean") {
+    return String(value);
+  }
+
+  try {
+    return JSON.stringify(value);
+  } catch {
+    return "[unserializable]";
+  }
+}
+
+function getPayloadSummary(entry: AuditLogEntry): string {
+  const metadata = isRecord(entry.metadata) ? entry.metadata : undefined;
+  const payload = metadata && isRecord(metadata.payload) ? metadata.payload : undefined;
+
+  if (typeof entry.content === "string" && entry.content.trim().length > 0) {
+    return truncateText(entry.content.trim(), SUMMARY_MAX_LENGTH);
+  }
+
+  if (payload) {
+    const summary = Object.entries(payload)
+      .map(([key, value]) => `${key}=${stringifyPayloadValue(value)}`)
+      .join(", ");
+
+    if (summary.length > 0) {
+      return truncateText(summary, SUMMARY_MAX_LENGTH);
+    }
+  }
+
+  return "—";
+}
+
+function getActionVariant(action: string): BadgeVariant {
+  switch (action) {
+    case "inject":
+      return "badge-blue";
+    case "pause":
+      return "status-warning";
+    case "resume":
+      return "status-success";
+    case "kill":
+      return "status-error";
+    default:
+      return "status-neutral";
+  }
+}
+
+async function fetchAuditLog(
+  sessionId: string | undefined,
+  page: number
+): Promise<AuditLogResponse> {
+  const params = new URLSearchParams({
+    page: String(page),
+    limit: String(AUDIT_LOG_PAGE_SIZE),
+  });
+
+  const normalizedSessionId = sessionId?.trim();
+  if (normalizedSessionId && normalizedSessionId.length > 0) {
+    params.set("sessionId", normalizedSessionId);
+  }
+
+  return apiGet<AuditLogResponse>(`/api/mission-control/audit-log?${params.toString()}`);
+}
+
+export function AuditLogDrawer({ sessionId, trigger }: AuditLogDrawerProps): React.JSX.Element {
+  const [open, setOpen] = useState(false);
+  const [page, setPage] = useState(1);
+
+  const triggerElement = useMemo(
+    () =>
+      isValidElement(trigger) ? (
+        trigger
+      ) : (
+        <Button variant="outline" size="sm">
+          {trigger}
+        </Button>
+      ),
+    [trigger]
+  );
+
+  const auditLogQuery = useQuery<AuditLogResponse>({
+    queryKey: ["mission-control", "audit-log", sessionId ?? "all", page],
+    queryFn: async (): Promise<AuditLogResponse> => fetchAuditLog(sessionId, page),
+    enabled: open,
+    refetchInterval: open ? AUDIT_LOG_REFRESH_INTERVAL_MS : false,
+  });
+
+  useEffect(() => {
+    if (open) {
+      setPage(1);
+    }
+  }, [open, sessionId]);
+
+  useEffect(() => {
+    const pages = auditLogQuery.data?.pages;
+    if (pages !== undefined && pages > 0 && page > pages) {
+      setPage(pages);
+    }
+  }, [auditLogQuery.data?.pages, page]);
+
+  const totalItems = auditLogQuery.data?.total ?? 0;
+  const totalPages = auditLogQuery.data?.pages ?? 0;
+  const items = auditLogQuery.data?.items ?? [];
+
+  const canGoPrevious = page > 1;
+  const canGoNext = totalPages > 0 && page < totalPages;
+  const errorMessage =
+    auditLogQuery.error instanceof Error ? auditLogQuery.error.message : "Failed to load audit log";
+
+  return (
+    <Sheet open={open} onOpenChange={setOpen}>
+      <SheetTrigger asChild>{triggerElement}</SheetTrigger>
+      <SheetContent className="sm:max-w-[920px]">
+        <SheetHeader>
+          <div className="flex items-center justify-between gap-3">
+            <SheetTitle>Audit Log</SheetTitle>
+            {auditLogQuery.isFetching ? (
+              <Loader2 className="h-4 w-4 animate-spin text-muted-foreground" aria-hidden="true" />
+            ) : null}
+          </div>
+          <SheetDescription>
+            {sessionId
+              ? `Showing actions for session ${sessionId}.`
+              : "Showing operator actions across all mission control sessions."}
+          </SheetDescription>
+        </SheetHeader>
+
+        <div className="mt-4 flex min-h-0 flex-1 flex-col gap-3">
+          <div className="rounded-md border border-border/70">
+            <ScrollArea className="h-[64vh]">
+              <table className="w-full min-w-[760px] border-collapse text-sm">
+                <thead className="sticky top-0 z-10 bg-muted/90">
+                  <tr>
+                    <th className="px-3 py-2 text-left font-medium text-muted-foreground">
+                      Timestamp
+                    </th>
+                    <th className="px-3 py-2 text-left font-medium text-muted-foreground">
+                      Action
+                    </th>
+                    <th className="px-3 py-2 text-left font-medium text-muted-foreground">
+                      Session
+                    </th>
+                    <th className="px-3 py-2 text-left font-medium text-muted-foreground">
+                      Operator
+                    </th>
+                    <th className="px-3 py-2 text-left font-medium text-muted-foreground">
+                      Payload
+                    </th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {auditLogQuery.isLoading ? (
+                    <tr>
+                      <td
+                        colSpan={5}
+                        className="px-3 py-6 text-center text-sm text-muted-foreground"
+                      >
+                        Loading audit log...
+                      </td>
+                    </tr>
+                  ) : auditLogQuery.error ? (
+                    <tr>
+                      <td colSpan={5} className="px-3 py-6 text-center text-sm text-red-500">
+                        {errorMessage}
+                      </td>
+                    </tr>
+                  ) : items.length === 0 ? (
+                    <tr>
+                      <td
+                        colSpan={5}
+                        className="px-3 py-6 text-center text-sm text-muted-foreground"
+                      >
+                        No audit entries found.
+                      </td>
+                    </tr>
+                  ) : (
+                    items.map((entry) => {
+                      const payloadSummary = getPayloadSummary(entry);
+
+                      return (
+                        <tr key={entry.id} className="border-t border-border/60 align-top">
+                          <td className="px-3 py-2 font-mono text-xs text-muted-foreground">
+                            {formatTimestamp(entry.createdAt)}
+                          </td>
+                          <td className="px-3 py-2">
+                            <Badge variant={getActionVariant(entry.action)} className="capitalize">
+                              {entry.action}
+                            </Badge>
+                          </td>
+                          <td className="px-3 py-2 font-mono text-xs" title={entry.sessionId}>
+                            {truncateSessionId(entry.sessionId)}
+                          </td>
+                          <td
+                            className="px-3 py-2 text-xs text-muted-foreground"
+                            title={entry.userId}
+                          >
+                            {entry.userId}
+                          </td>
+                          <td className="px-3 py-2 text-xs" title={payloadSummary}>
+                            {payloadSummary}
+                          </td>
+                        </tr>
+                      );
+                    })
+                  )}
+                </tbody>
+              </table>
+            </ScrollArea>
+          </div>
+
+          <div className="flex items-center justify-between">
+            <p className="text-xs text-muted-foreground">{totalItems} total entries</p>
+            <div className="flex items-center gap-2">
+              <Button
+                variant="outline"
+                size="sm"
+                disabled={!canGoPrevious || auditLogQuery.isFetching}
+                onClick={() => {
+                  setPage((currentPage) => Math.max(1, currentPage - 1));
+                }}
+              >
+                Previous
+              </Button>
+              <span className="text-xs text-muted-foreground">
+                Page {page} of {Math.max(totalPages, 1)}
+              </span>
+              <Button
+                variant="outline"
+                size="sm"
+                disabled={!canGoNext || auditLogQuery.isFetching}
+                onClick={() => {
+                  setPage((currentPage) => currentPage + 1);
+                }}
+              >
+                Next
+              </Button>
+            </div>
+          </div>
+        </div>
+      </SheetContent>
+    </Sheet>
+  );
+}

apps/web/src/components/mission-control/BargeInInput.test.tsx

@@ -0,0 +1,155 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import * as MosaicUi from "@mosaic/ui";
+import type { ButtonHTMLAttributes, ReactNode } from "react";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+const mockApiPost = vi.fn<(endpoint: string, body?: unknown) => Promise<{ message?: string }>>();
+const mockShowToast = vi.fn<(message: string, variant?: string) => void>();
+const useToastSpy = vi.spyOn(MosaicUi, "useToast");
+
+vi.mock("@/lib/api/client", () => ({
+  apiPost: (endpoint: string, body?: unknown): Promise<{ message?: string }> =>
+    mockApiPost(endpoint, body),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+import { BargeInInput } from "./BargeInInput";
+
+describe("BargeInInput", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+    mockApiPost.mockResolvedValue({ message: "ok" });
+    useToastSpy.mockReturnValue({
+      showToast: mockShowToast,
+      removeToast: vi.fn(),
+    } as ReturnType<typeof MosaicUi.useToast>);
+  });
+
+  afterEach((): void => {
+    vi.unstubAllGlobals();
+  });
+
+  it("renders input controls and keeps send disabled for empty content", (): void => {
+    render(<BargeInInput sessionId="session-1" />);
+
+    expect(screen.getByLabelText("Inject message")).toBeInTheDocument();
+    expect(screen.getByRole("checkbox", { name: "Pause before send" })).not.toBeChecked();
+    expect(screen.getByRole("button", { name: "Send" })).toBeDisabled();
+  });
+
+  it("sends a trimmed message and clears the textarea", async (): Promise<void> => {
+    const onSent = vi.fn<() => void>();
+    const user = userEvent.setup();
+
+    render(<BargeInInput sessionId="session-1" onSent={onSent} />);
+
+    const textarea = screen.getByLabelText("Inject message");
+    await user.type(textarea, "  execute plan  ");
+    await user.click(screen.getByRole("button", { name: "Send" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/session-1/inject", {
+        content: "execute plan",
+      });
+    });
+
+    expect(onSent).toHaveBeenCalledTimes(1);
+    expect(textarea).toHaveValue("");
+  });
+
+  it("pauses and resumes the session around injection when checkbox is enabled", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(<BargeInInput sessionId="session-2" />);
+
+    await user.click(screen.getByRole("checkbox", { name: "Pause before send" }));
+    await user.type(screen.getByLabelText("Inject message"), "hello world");
+    await user.click(screen.getByRole("button", { name: "Send" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledTimes(3);
+    });
+
+    const calls = mockApiPost.mock.calls as [string, unknown?][];
+
+    expect(calls[0]).toEqual(["/api/mission-control/sessions/session-2/pause", undefined]);
+    expect(calls[1]).toEqual([
+      "/api/mission-control/sessions/session-2/inject",
+      { content: "hello world" },
+    ]);
+    expect(calls[2]).toEqual(["/api/mission-control/sessions/session-2/resume", undefined]);
+  });
+
+  it("submits with Enter and does not submit on Shift+Enter", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(<BargeInInput sessionId="session-3" />);
+
+    const textarea = screen.getByLabelText("Inject message");
+    await user.type(textarea, "first");
+    fireEvent.keyDown(textarea, { key: "Enter", code: "Enter", shiftKey: true });
+
+    expect(mockApiPost).not.toHaveBeenCalled();
+
+    fireEvent.keyDown(textarea, { key: "Enter", code: "Enter", shiftKey: false });
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/session-3/inject", {
+        content: "first",
+      });
+    });
+  });
+
+  it("shows an inline error and toast when injection fails", async (): Promise<void> => {
+    const user = userEvent.setup();
+    mockApiPost.mockRejectedValueOnce(new Error("Injection failed"));
+
+    render(<BargeInInput sessionId="session-4" />);
+
+    await user.type(screen.getByLabelText("Inject message"), "help");
+    await user.click(screen.getByRole("button", { name: "Send" }));
+
+    await waitFor((): void => {
+      expect(screen.getByRole("alert")).toHaveTextContent("Injection failed");
+    });
+
+    expect(mockShowToast).toHaveBeenCalledWith("Injection failed", "error");
+  });
+
+  it("reports resume failures after a successful send", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    mockApiPost
+      .mockResolvedValueOnce({ message: "paused" })
+      .mockResolvedValueOnce({ message: "sent" })
+      .mockRejectedValueOnce(new Error("resume failed"));
+
+    render(<BargeInInput sessionId="session-5" />);
+
+    await user.click(screen.getByRole("checkbox", { name: "Pause before send" }));
+    await user.type(screen.getByLabelText("Inject message"), "deploy now");
+    await user.click(screen.getByRole("button", { name: "Send" }));
+
+    await waitFor((): void => {
+      expect(screen.getByRole("alert")).toHaveTextContent(
+        "Message sent, but failed to resume session: resume failed"
+      );
+    });
+
+    expect(mockShowToast).toHaveBeenCalledWith(
+      "Message sent, but failed to resume session: resume failed",
+      "error"
+    );
+  });
+});

apps/web/src/components/mission-control/BargeInInput.tsx

@@ -0,0 +1,147 @@
+"use client";
+
+import { useCallback, useState, type KeyboardEvent } from "react";
+import { Loader2 } from "lucide-react";
+import { useToast } from "@mosaic/ui";
+import { Button } from "@/components/ui/button";
+import { apiPost } from "@/lib/api/client";
+
+const MAX_ROWS = 4;
+const TEXTAREA_MAX_HEIGHT_REM = 6.5;
+
+interface BargeInMutationResponse {
+  message?: string;
+}
+
+export interface BargeInInputProps {
+  sessionId: string;
+  onSent?: () => void;
+}
+
+function getErrorMessage(error: unknown): string {
+  if (error instanceof Error && error.message.trim().length > 0) {
+    return error.message;
+  }
+  return "Failed to send message to the session.";
+}
+
+export function BargeInInput({ sessionId, onSent }: BargeInInputProps): React.JSX.Element {
+  const { showToast } = useToast();
+  const [content, setContent] = useState("");
+  const [pauseBeforeSend, setPauseBeforeSend] = useState(false);
+  const [isSending, setIsSending] = useState(false);
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+
+  const handleSend = useCallback(async (): Promise<void> => {
+    const trimmedContent = content.trim();
+    if (!trimmedContent || isSending) {
+      return;
+    }
+
+    const encodedSessionId = encodeURIComponent(sessionId);
+    const baseEndpoint = `/api/mission-control/sessions/${encodedSessionId}`;
+    let didPause = false;
+    let didInject = false;
+
+    setIsSending(true);
+    setErrorMessage(null);
+
+    try {
+      if (pauseBeforeSend) {
+        await apiPost<BargeInMutationResponse>(`${baseEndpoint}/pause`);
+        didPause = true;
+      }
+
+      await apiPost<BargeInMutationResponse>(`${baseEndpoint}/inject`, { content: trimmedContent });
+      didInject = true;
+      setContent("");
+      onSent?.();
+    } catch (error) {
+      const message = getErrorMessage(error);
+      setErrorMessage(message);
+      showToast(message, "error");
+    } finally {
+      if (didPause) {
+        try {
+          await apiPost<BargeInMutationResponse>(`${baseEndpoint}/resume`);
+        } catch (resumeError) {
+          const resumeMessage = getErrorMessage(resumeError);
+          const message = didInject
+            ? `Message sent, but failed to resume session: ${resumeMessage}`
+            : `Failed to resume session: ${resumeMessage}`;
+          setErrorMessage(message);
+          showToast(message, "error");
+        }
+      }
+
+      setIsSending(false);
+    }
+  }, [content, isSending, onSent, pauseBeforeSend, sessionId, showToast]);
+
+  const handleKeyDown = useCallback(
+    (event: KeyboardEvent<HTMLTextAreaElement>): void => {
+      if (event.key === "Enter" && !event.shiftKey) {
+        event.preventDefault();
+        void handleSend();
+      }
+    },
+    [handleSend]
+  );
+
+  const isSendDisabled = isSending || content.trim().length === 0;
+
+  return (
+    <div className="space-y-2">
+      <textarea
+        value={content}
+        onChange={(event) => {
+          setContent(event.target.value);
+        }}
+        onKeyDown={handleKeyDown}
+        disabled={isSending}
+        rows={MAX_ROWS}
+        placeholder="Inject a message into this session..."
+        className="block w-full resize-y rounded-md border border-border bg-background px-3 py-2 text-sm leading-5 text-foreground outline-none placeholder:text-muted-foreground disabled:cursor-not-allowed disabled:opacity-60"
+        style={{ maxHeight: `${String(TEXTAREA_MAX_HEIGHT_REM)}rem` }}
+        aria-label="Inject message"
+      />
+      <div className="flex items-center justify-between gap-3">
+        <label className="flex items-center gap-2 text-sm text-muted-foreground">
+          <input
+            type="checkbox"
+            checked={pauseBeforeSend}
+            onChange={(event) => {
+              setPauseBeforeSend(event.target.checked);
+            }}
+            disabled={isSending}
+            className="h-4 w-4 rounded border-border"
+          />
+          <span>Pause before send</span>
+        </label>
+        <Button
+          type="button"
+          variant="primary"
+          size="sm"
+          disabled={isSendDisabled}
+          onClick={() => {
+            void handleSend();
+          }}
+        >
+          {isSending ? (
+            <span className="flex items-center gap-2">
+              <Loader2 className="h-4 w-4 animate-spin" aria-hidden="true" />
+              Sending...
+            </span>
+          ) : (
+            "Send"
+          )}
+        </Button>
+      </div>
+      {errorMessage ? (
+        <p role="alert" className="text-sm text-red-500">
+          {errorMessage}
+        </p>
+      ) : null}
+    </div>
+  );
+}

apps/web/src/components/mission-control/GlobalAgentRoster.test.tsx

@@ -0,0 +1,203 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import type { ButtonHTMLAttributes, HTMLAttributes, ReactNode } from "react";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+interface MockContainerProps extends HTMLAttributes<HTMLElement> {
+  children: ReactNode;
+}
+
+interface MockSession {
+  id: string;
+  providerId: string;
+  providerType: string;
+  status: "active" | "paused" | "killed";
+  createdAt: string;
+  updatedAt: string;
+  metadata?: Record<string, unknown>;
+}
+
+const mockApiGet = vi.fn<(endpoint: string) => Promise<MockSession[]>>();
+const mockApiPost = vi.fn<(endpoint: string, body?: unknown) => Promise<{ message: string }>>();
+const mockKillAllDialog = vi.fn<() => React.JSX.Element>();
+
+vi.mock("@/lib/api/client", () => ({
+  apiGet: (endpoint: string): Promise<MockSession[]> => mockApiGet(endpoint),
+  apiPost: (endpoint: string, body?: unknown): Promise<{ message: string }> =>
+    mockApiPost(endpoint, body),
+}));
+
+vi.mock("@/components/mission-control/KillAllDialog", () => ({
+  KillAllDialog: (): React.JSX.Element => mockKillAllDialog(),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+vi.mock("@/components/ui/badge", () => ({
+  Badge: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <span {...props}>{children}</span>
+  ),
+}));
+
+vi.mock("@/components/ui/card", () => ({
+  Card: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <section {...props}>{children}</section>
+  ),
+  CardHeader: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <header {...props}>{children}</header>
+  ),
+  CardContent: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <div {...props}>{children}</div>
+  ),
+  CardTitle: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <h2 {...props}>{children}</h2>
+  ),
+}));
+
+import { GlobalAgentRoster } from "./GlobalAgentRoster";
+
+function renderWithQueryClient(ui: React.JSX.Element): ReturnType<typeof render> {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+
+  return render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+function makeSession(overrides: Partial<MockSession>): MockSession {
+  return {
+    id: "session-12345678",
+    providerId: "internal",
+    providerType: "internal",
+    status: "active",
+    createdAt: "2026-03-07T10:00:00.000Z",
+    updatedAt: "2026-03-07T10:01:00.000Z",
+    ...overrides,
+  };
+}
+
+function getRowForSessionLabel(label: string): HTMLElement {
+  const sessionLabel = screen.getByText(label);
+  const row = sessionLabel.closest('[role="button"]');
+
+  if (!(row instanceof HTMLElement)) {
+    throw new Error(`Expected a row element for session label ${label}`);
+  }
+
+  return row;
+}
+
+describe("GlobalAgentRoster", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+
+    mockApiGet.mockResolvedValue([]);
+    mockApiPost.mockResolvedValue({ message: "ok" });
+
+    mockKillAllDialog.mockImplementation(
+      (): React.JSX.Element => <div data-testid="kill-all-dialog">kill-all-dialog</div>
+    );
+  });
+
+  afterEach((): void => {
+    vi.unstubAllGlobals();
+  });
+
+  it("renders the empty state when no active sessions are returned", async (): Promise<void> => {
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    await waitFor((): void => {
+      expect(screen.getByText("No active agents")).toBeInTheDocument();
+    });
+
+    expect(screen.queryByTestId("kill-all-dialog")).not.toBeInTheDocument();
+  });
+
+  it("groups sessions by provider and shows kill-all control when sessions exist", async (): Promise<void> => {
+    mockApiGet.mockResolvedValue([
+      makeSession({ id: "alpha123456", providerId: "internal", providerType: "internal" }),
+      makeSession({ id: "bravo123456", providerId: "codex", providerType: "openai" }),
+    ]);
+
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    await waitFor((): void => {
+      expect(screen.getByText("internal")).toBeInTheDocument();
+      expect(screen.getByText("codex (openai)")).toBeInTheDocument();
+    });
+
+    expect(screen.getByText("alpha123")).toBeInTheDocument();
+    expect(screen.getByText("bravo123")).toBeInTheDocument();
+    expect(screen.getByTestId("kill-all-dialog")).toBeInTheDocument();
+  });
+
+  it("calls onSelectSession on row click and keyboard activation", async (): Promise<void> => {
+    const onSelectSession = vi.fn<(sessionId: string) => void>();
+
+    mockApiGet.mockResolvedValue([makeSession({ id: "target123456" })]);
+
+    renderWithQueryClient(<GlobalAgentRoster onSelectSession={onSelectSession} />);
+
+    await waitFor((): void => {
+      expect(screen.getByText("target12")).toBeInTheDocument();
+    });
+
+    const row = getRowForSessionLabel("target12");
+
+    fireEvent.click(row);
+
+    fireEvent.keyDown(row, { key: "Enter" });
+
+    expect(onSelectSession).toHaveBeenCalledTimes(2);
+    expect(onSelectSession).toHaveBeenNthCalledWith(1, "target123456");
+    expect(onSelectSession).toHaveBeenNthCalledWith(2, "target123456");
+  });
+
+  it("kills a session from the roster", async (): Promise<void> => {
+    mockApiGet.mockResolvedValue([makeSession({ id: "killme123456" })]);
+
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    await waitFor((): void => {
+      expect(screen.getByRole("button", { name: "Kill session killme12" })).toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: "Kill session killme12" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/killme123456/kill", {
+        force: false,
+      });
+    });
+  });
+
+  it("collapses and reopens provider groups", async (): Promise<void> => {
+    mockApiGet.mockResolvedValue([makeSession({ id: "grouped12345" })]);
+
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    await waitFor((): void => {
+      expect(screen.getByText("grouped1")).toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByRole("button", { name: /internal/i }));
+
+    expect(screen.queryByText("grouped1")).not.toBeInTheDocument();
+
+    fireEvent.click(screen.getByRole("button", { name: /internal/i }));
+
+    expect(screen.getByText("grouped1")).toBeInTheDocument();
+  });
+});

apps/web/src/components/mission-control/GlobalAgentRoster.tsx

@@ -0,0 +1,292 @@
+"use client";
+
+import { useMemo, useState } from "react";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import type { AgentSession } from "@mosaic/shared";
+import { ChevronRight, Loader2, X } from "lucide-react";
+import { KillAllDialog } from "@/components/mission-control/KillAllDialog";
+import { Badge } from "@/components/ui/badge";
+import type { BadgeVariant } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { Collapsible } from "@/components/ui/collapsible";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import { Skeleton } from "@/components/ui/skeleton";
+import { apiGet, apiPost } from "@/lib/api/client";
+
+const SESSIONS_QUERY_KEY = ["mission-control", "sessions"] as const;
+const SESSIONS_POLL_INTERVAL_MS = 5_000;
+
+type MissionControlSessionStatus = AgentSession["status"] | "killed";
+
+interface MissionControlSession extends Omit<AgentSession, "status" | "createdAt" | "updatedAt"> {
+  status: MissionControlSessionStatus;
+  createdAt: string | Date;
+  updatedAt: string | Date;
+}
+
+interface SessionsPayload {
+  sessions: MissionControlSession[];
+}
+
+interface ProviderSessionGroup {
+  providerId: string;
+  providerType: string;
+  sessions: MissionControlSession[];
+}
+
+export interface GlobalAgentRosterProps {
+  onSelectSession?: (sessionId: string) => void;
+  selectedSessionId?: string | undefined;
+}
+
+function getStatusVariant(status: MissionControlSessionStatus): BadgeVariant {
+  switch (status) {
+    case "active":
+      return "status-success";
+    case "paused":
+      return "status-warning";
+    case "killed":
+      return "status-error";
+    default:
+      return "status-neutral";
+  }
+}
+
+function truncateSessionId(sessionId: string): string {
+  return sessionId.slice(0, 8);
+}
+
+function resolveProviderName(providerId: string, providerType: string): string {
+  return providerId === providerType ? providerId : `${providerId} (${providerType})`;
+}
+
+function groupByProvider(sessions: MissionControlSession[]): ProviderSessionGroup[] {
+  const grouped = new Map<string, ProviderSessionGroup>();
+
+  for (const session of sessions) {
+    const existing = grouped.get(session.providerId);
+    if (existing) {
+      existing.sessions.push(session);
+      continue;
+    }
+
+    grouped.set(session.providerId, {
+      providerId: session.providerId,
+      providerType: session.providerType,
+      sessions: [session],
+    });
+  }
+
+  return Array.from(grouped.values()).sort((a, b) => a.providerId.localeCompare(b.providerId));
+}
+
+async function fetchSessions(): Promise<MissionControlSession[]> {
+  const payload = await apiGet<MissionControlSession[] | SessionsPayload>(
+    "/api/mission-control/sessions"
+  );
+  return Array.isArray(payload) ? payload : payload.sessions;
+}
+
+function toKillAllSessions(sessions: MissionControlSession[]): AgentSession[] {
+  return sessions
+    .filter(
+      (session): session is MissionControlSession & { status: AgentSession["status"] } =>
+        session.status !== "killed"
+    )
+    .map((session) => ({
+      ...session,
+      createdAt:
+        session.createdAt instanceof Date ? session.createdAt : new Date(session.createdAt),
+      updatedAt:
+        session.updatedAt instanceof Date ? session.updatedAt : new Date(session.updatedAt),
+    }));
+}
+
+export function GlobalAgentRoster({
+  onSelectSession,
+  selectedSessionId,
+}: GlobalAgentRosterProps): React.JSX.Element {
+  const queryClient = useQueryClient();
+  const [openProviders, setOpenProviders] = useState<Record<string, boolean>>({});
+
+  const sessionsQuery = useQuery<MissionControlSession[]>({
+    queryKey: SESSIONS_QUERY_KEY,
+    queryFn: fetchSessions,
+    refetchInterval: SESSIONS_POLL_INTERVAL_MS,
+  });
+
+  const killMutation = useMutation({
+    mutationFn: async (sessionId: string): Promise<string> => {
+      await apiPost<{ message: string }>(`/api/mission-control/sessions/${sessionId}/kill`, {
+        force: false,
+      });
+      return sessionId;
+    },
+    onSuccess: (): void => {
+      void queryClient.invalidateQueries({ queryKey: SESSIONS_QUERY_KEY });
+    },
+  });
+
+  const groupedSessions = useMemo(
+    () => groupByProvider(sessionsQuery.data ?? []),
+    [sessionsQuery.data]
+  );
+
+  const killAllSessions = useMemo(
+    () => toKillAllSessions(sessionsQuery.data ?? []),
+    [sessionsQuery.data]
+  );
+
+  const totalSessionCount = sessionsQuery.data?.length ?? 0;
+
+  const pendingKillSessionId = killMutation.isPending ? killMutation.variables : undefined;
+
+  const toggleProvider = (providerId: string): void => {
+    setOpenProviders((prev) => ({
+      ...prev,
+      [providerId]: !(prev[providerId] ?? true),
+    }));
+  };
+
+  const isProviderOpen = (providerId: string): boolean => openProviders[providerId] ?? true;
+
+  const handleKillAllComplete = (): void => {
+    void queryClient.invalidateQueries({ queryKey: SESSIONS_QUERY_KEY });
+  };
+
+  return (
+    <Card className="flex h-full min-h-0 flex-col">
+      <CardHeader className="pb-2">
+        <CardTitle className="flex items-center justify-between gap-2 text-base">
+          <span>Agent Roster</span>
+          <div className="flex items-center gap-2">
+            {totalSessionCount > 0 ? (
+              <KillAllDialog sessions={killAllSessions} onComplete={handleKillAllComplete} />
+            ) : null}
+            {sessionsQuery.isFetching && !sessionsQuery.isLoading ? (
+              <Loader2 className="h-4 w-4 animate-spin text-muted-foreground" aria-hidden="true" />
+            ) : null}
+          </div>
+        </CardTitle>
+      </CardHeader>
+      <CardContent className="min-h-0 flex-1 px-3 pb-3">
+        {sessionsQuery.isLoading ? (
+          <ScrollArea className="h-full">
+            <div className="space-y-2 pr-1">
+              {Array.from({ length: 6 }).map((_, index) => (
+                <Skeleton key={`roster-skeleton-${String(index)}`} className="h-10 w-full" />
+              ))}
+            </div>
+          </ScrollArea>
+        ) : sessionsQuery.error ? (
+          <div className="flex h-full items-center justify-center text-center text-sm text-red-500">
+            Failed to load agents: {sessionsQuery.error.message}
+          </div>
+        ) : groupedSessions.length === 0 ? (
+          <div className="flex h-full items-center justify-center text-sm text-muted-foreground">
+            No active agents
+          </div>
+        ) : (
+          <ScrollArea className="h-full">
+            <div className="space-y-3 pr-1">
+              {groupedSessions.map((group) => {
+                const providerOpen = isProviderOpen(group.providerId);
+
+                return (
+                  <Collapsible key={group.providerId} open={providerOpen} className="space-y-1">
+                    <button
+                      type="button"
+                      onClick={() => {
+                        toggleProvider(group.providerId);
+                      }}
+                      className="flex w-full items-center gap-2 rounded-md px-1 py-1 text-left text-sm hover:bg-muted/40"
+                      aria-expanded={providerOpen}
+                    >
+                      <ChevronRight
+                        className={`h-4 w-4 text-muted-foreground transition-transform ${providerOpen ? "rotate-90" : ""}`}
+                        aria-hidden="true"
+                      />
+                      <span className="font-medium">
+                        {resolveProviderName(group.providerId, group.providerType)}
+                      </span>
+                      <span className="ml-auto text-xs text-muted-foreground">
+                        {group.sessions.length}
+                      </span>
+                    </button>
+                    {providerOpen ? (
+                      <div className="space-y-1 pl-2">
+                        {group.sessions.map((session) => {
+                          const isSelected = selectedSessionId === session.id;
+                          const isKilling = pendingKillSessionId === session.id;
+
+                          return (
+                            <div
+                              key={session.id}
+                              role="button"
+                              tabIndex={0}
+                              onClick={() => {
+                                onSelectSession?.(session.id);
+                              }}
+                              onKeyDown={(event) => {
+                                if (event.key === "Enter" || event.key === " ") {
+                                  event.preventDefault();
+                                  onSelectSession?.(session.id);
+                                }
+                              }}
+                              className="flex items-center justify-between gap-2 rounded-md border border-transparent px-2 py-1.5 transition-colors hover:bg-muted/40"
+                              style={
+                                isSelected
+                                  ? {
+                                      borderColor: "rgba(47, 128, 255, 0.35)",
+                                      backgroundColor: "rgba(47, 128, 255, 0.08)",
+                                    }
+                                  : undefined
+                              }
+                            >
+                              <div className="flex min-w-0 items-center gap-2">
+                                <span className="font-mono text-xs" title={session.id}>
+                                  {truncateSessionId(session.id)}
+                                </span>
+                                <Badge
+                                  variant={getStatusVariant(session.status)}
+                                  className="capitalize"
+                                >
+                                  {session.status}
+                                </Badge>
+                              </div>
+                              <Button
+                                variant="ghost"
+                                size="sm"
+                                className="h-7 min-h-7 w-7 min-w-7 p-0"
+                                disabled={isKilling}
+                                onClick={(event) => {
+                                  event.stopPropagation();
+                                  killMutation.mutate(session.id);
+                                }}
+                                aria-label={`Kill session ${truncateSessionId(session.id)}`}
+                              >
+                                {isKilling ? (
+                                  <Loader2
+                                    className="h-3.5 w-3.5 animate-spin"
+                                    aria-hidden="true"
+                                  />
+                                ) : (
+                                  <X className="h-3.5 w-3.5" aria-hidden="true" />
+                                )}
+                              </Button>
+                            </div>
+                          );
+                        })}
+                      </div>
+                    ) : null}
+                  </Collapsible>
+                );
+              })}
+            </div>
+          </ScrollArea>
+        )}
+      </CardContent>
+    </Card>
+  );
+}

apps/web/src/components/mission-control/KillAllDialog.test.tsx

@@ -0,0 +1,170 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import type {
+  ButtonHTMLAttributes,
+  InputHTMLAttributes,
+  LabelHTMLAttributes,
+  ReactNode,
+} from "react";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+interface MockInputProps extends InputHTMLAttributes<HTMLInputElement> {
+  children?: ReactNode;
+}
+
+interface MockLabelProps extends LabelHTMLAttributes<HTMLLabelElement> {
+  children: ReactNode;
+}
+
+interface MockSession {
+  id: string;
+  providerId: string;
+  providerType: string;
+  status: "active" | "paused";
+  createdAt: Date;
+  updatedAt: Date;
+}
+
+const mockApiPost = vi.fn<(endpoint: string, body?: unknown) => Promise<{ message: string }>>();
+
+vi.mock("@/lib/api/client", () => ({
+  apiPost: (endpoint: string, body?: unknown): Promise<{ message: string }> =>
+    mockApiPost(endpoint, body),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+vi.mock("@/components/ui/input", () => ({
+  Input: ({ ...props }: MockInputProps): React.JSX.Element => <input {...props} />,
+}));
+
+vi.mock("@/components/ui/label", () => ({
+  Label: ({ children, ...props }: MockLabelProps): React.JSX.Element => (
+    <label {...props}>{children}</label>
+  ),
+}));
+
+import { KillAllDialog } from "./KillAllDialog";
+
+function makeSession(overrides: Partial<MockSession>): MockSession {
+  return {
+    id: "session-1",
+    providerId: "internal",
+    providerType: "internal",
+    status: "active",
+    createdAt: new Date("2026-03-07T10:00:00.000Z"),
+    updatedAt: new Date("2026-03-07T10:01:00.000Z"),
+    ...overrides,
+  };
+}
+
+describe("KillAllDialog", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    mockApiPost.mockResolvedValue({ message: "killed" });
+  });
+
+  it("renders trigger button and requires exact confirmation text", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(<KillAllDialog sessions={[makeSession({})]} />);
+
+    await user.click(screen.getByRole("button", { name: "Kill All" }));
+
+    const confirmInput = screen.getByLabelText("Type KILL ALL to confirm");
+    const confirmButton = screen.getByRole("button", { name: "Kill All Agents" });
+
+    expect(confirmButton).toBeDisabled();
+
+    await user.type(confirmInput, "kill all");
+    expect(confirmButton).toBeDisabled();
+
+    await user.clear(confirmInput);
+    await user.type(confirmInput, "KILL ALL");
+
+    expect(confirmButton).toBeEnabled();
+  });
+
+  it("kills only internal sessions by default and invokes completion callback", async (): Promise<void> => {
+    const onComplete = vi.fn<() => void>();
+    const user = userEvent.setup();
+
+    render(
+      <KillAllDialog
+        sessions={[
+          makeSession({ id: "internal-1", providerType: "internal" }),
+          makeSession({ id: "external-1", providerType: "external" }),
+        ]}
+        onComplete={onComplete}
+      />
+    );
+
+    await user.click(screen.getByRole("button", { name: "Kill All" }));
+    await user.type(screen.getByLabelText("Type KILL ALL to confirm"), "KILL ALL");
+    await user.click(screen.getByRole("button", { name: "Kill All Agents" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/internal-1/kill", {
+        force: true,
+      });
+    });
+
+    expect(mockApiPost).not.toHaveBeenCalledWith("/api/mission-control/sessions/external-1/kill", {
+      force: true,
+    });
+    expect(onComplete).toHaveBeenCalledTimes(1);
+  });
+
+  it("kills all providers when all scope is selected", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(
+      <KillAllDialog
+        sessions={[
+          makeSession({ id: "internal-2", providerType: "internal" }),
+          makeSession({ id: "external-2", providerType: "external" }),
+        ]}
+      />
+    );
+
+    await user.click(screen.getByRole("button", { name: "Kill All" }));
+    await user.click(screen.getByRole("radio", { name: /All providers \(2\)/ }));
+    await user.type(screen.getByLabelText("Type KILL ALL to confirm"), "KILL ALL");
+    await user.click(screen.getByRole("button", { name: "Kill All Agents" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/internal-2/kill", {
+        force: true,
+      });
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/external-2/kill", {
+        force: true,
+      });
+    });
+  });
+
+  it("shows empty-scope warning when internal sessions are unavailable", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    render(
+      <KillAllDialog
+        sessions={[
+          makeSession({ id: "external-only", providerId: "ext", providerType: "external" }),
+        ]}
+      />
+    );
+
+    await user.click(screen.getByRole("button", { name: "Kill All" }));
+    await user.type(screen.getByLabelText("Type KILL ALL to confirm"), "KILL ALL");
+
+    expect(screen.getByText("No sessions in the selected scope.")).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "Kill All Agents" })).toBeDisabled();
+  });
+});

apps/web/src/components/mission-control/KillAllDialog.tsx

@@ -0,0 +1,224 @@
+"use client";
+
+import { useEffect, useMemo, useRef, useState } from "react";
+import type { AgentSession } from "@mosaic/shared";
+import { Loader2 } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "@/components/ui/dialog";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { apiPost } from "@/lib/api/client";
+
+const CONFIRM_TEXT = "KILL ALL";
+const AUTO_CLOSE_DELAY_MS = 2_000;
+
+type KillScope = "internal" | "all";
+
+export interface KillAllDialogProps {
+  sessions: AgentSession[];
+  onComplete?: () => void;
+}
+
+export function KillAllDialog({ sessions, onComplete }: KillAllDialogProps): React.JSX.Element {
+  const [open, setOpen] = useState(false);
+  const [scope, setScope] = useState<KillScope>("internal");
+  const [confirmationInput, setConfirmationInput] = useState("");
+  const [isKilling, setIsKilling] = useState(false);
+  const [completedCount, setCompletedCount] = useState(0);
+  const [targetCount, setTargetCount] = useState(0);
+  const [successCount, setSuccessCount] = useState<number | null>(null);
+  const closeTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  const internalSessions = useMemo(
+    () => sessions.filter((session) => session.providerType.toLowerCase() === "internal"),
+    [sessions]
+  );
+
+  const scopedSessions = useMemo(
+    () => (scope === "all" ? sessions : internalSessions),
+    [scope, sessions, internalSessions]
+  );
+
+  const hasConfirmation = confirmationInput === CONFIRM_TEXT;
+  const isConfirmDisabled =
+    isKilling || successCount !== null || !hasConfirmation || scopedSessions.length === 0;
+
+  useEffect((): (() => void) => {
+    return (): void => {
+      if (closeTimeoutRef.current !== null) {
+        clearTimeout(closeTimeoutRef.current);
+      }
+    };
+  }, []);
+
+  const resetState = (): void => {
+    setScope("internal");
+    setConfirmationInput("");
+    setIsKilling(false);
+    setCompletedCount(0);
+    setTargetCount(0);
+    setSuccessCount(null);
+  };
+
+  const handleOpenChange = (nextOpen: boolean): void => {
+    if (!nextOpen && isKilling) {
+      return;
+    }
+
+    if (!nextOpen) {
+      if (closeTimeoutRef.current !== null) {
+        clearTimeout(closeTimeoutRef.current);
+      }
+      resetState();
+    }
+
+    setOpen(nextOpen);
+  };
+
+  const handleKillAll = async (): Promise<void> => {
+    if (isConfirmDisabled) {
+      return;
+    }
+
+    const targetSessions = [...scopedSessions];
+    setIsKilling(true);
+    setCompletedCount(0);
+    setTargetCount(targetSessions.length);
+    setSuccessCount(null);
+
+    const killRequests = targetSessions.map(async (session) => {
+      try {
+        await apiPost<{ message: string }>(`/api/mission-control/sessions/${session.id}/kill`, {
+          force: true,
+        });
+        return true;
+      } catch {
+        return false;
+      } finally {
+        setCompletedCount((currentCount) => currentCount + 1);
+      }
+    });
+
+    const results = await Promise.all(killRequests);
+    const successfulKills = results.filter(Boolean).length;
+
+    setIsKilling(false);
+    setSuccessCount(successfulKills);
+    onComplete?.();
+
+    closeTimeoutRef.current = setTimeout(() => {
+      setOpen(false);
+      resetState();
+    }, AUTO_CLOSE_DELAY_MS);
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={handleOpenChange}>
+      <DialogTrigger asChild>
+        <Button variant="danger" size="sm">
+          Kill All
+        </Button>
+      </DialogTrigger>
+      <DialogContent className="sm:max-w-[520px]">
+        <DialogHeader>
+          <DialogTitle>Kill All Agents</DialogTitle>
+          <DialogDescription>
+            This force-kills every selected agent session. This action cannot be undone.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4 py-2">
+          <fieldset className="space-y-2">
+            <legend className="text-sm font-medium">Scope</legend>
+            <label className="flex cursor-pointer items-center gap-2 text-sm text-foreground">
+              <input
+                type="radio"
+                name="kill-all-scope"
+                checked={scope === "internal"}
+                disabled={isKilling}
+                onChange={() => {
+                  setScope("internal");
+                }}
+              />
+              <span>Internal provider only ({internalSessions.length})</span>
+            </label>
+            <label className="flex cursor-pointer items-center gap-2 text-sm text-foreground">
+              <input
+                type="radio"
+                name="kill-all-scope"
+                checked={scope === "all"}
+                disabled={isKilling}
+                onChange={() => {
+                  setScope("all");
+                }}
+              />
+              <span>All providers ({sessions.length})</span>
+            </label>
+          </fieldset>
+
+          <div className="space-y-2">
+            <Label htmlFor="kill-all-confirmation-input">Type KILL ALL to confirm</Label>
+            <Input
+              id="kill-all-confirmation-input"
+              value={confirmationInput}
+              onChange={(event: React.ChangeEvent<HTMLInputElement>) => {
+                setConfirmationInput(event.target.value);
+              }}
+              placeholder={CONFIRM_TEXT}
+              autoComplete="off"
+              disabled={isKilling}
+            />
+          </div>
+
+          {scopedSessions.length === 0 ? (
+            <p className="text-sm text-red-500">No sessions in the selected scope.</p>
+          ) : null}
+
+          {isKilling ? (
+            <div className="flex items-center gap-2 text-sm text-muted-foreground">
+              <Loader2 className="h-4 w-4 animate-spin" aria-hidden="true" />
+              <span>
+                Killing {completedCount} of {targetCount} agents...
+              </span>
+            </div>
+          ) : successCount !== null ? (
+            <p className="text-sm text-muted-foreground">
+              Killed {successCount} of {targetCount} agents. Closing...
+            </p>
+          ) : null}
+        </div>
+
+        <DialogFooter>
+          <Button
+            type="button"
+            variant="outline"
+            disabled={isKilling}
+            onClick={() => {
+              setOpen(false);
+            }}
+          >
+            Cancel
+          </Button>
+          <Button
+            type="button"
+            variant="danger"
+            disabled={isConfirmDisabled}
+            onClick={() => {
+              void handleKillAll();
+            }}
+          >
+            Kill All Agents
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}

apps/web/src/components/mission-control/MissionControlLayout.test.tsx

@@ -0,0 +1,70 @@
+import { render, screen } from "@testing-library/react";
+import type { ButtonHTMLAttributes, ReactNode } from "react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+const mockGlobalAgentRoster = vi.fn();
+const mockMissionControlPanel = vi.fn();
+
+vi.mock("@/components/mission-control/AuditLogDrawer", () => ({
+  AuditLogDrawer: ({ trigger }: { trigger: ReactNode }): React.JSX.Element => (
+    <div data-testid="audit-log-drawer">{trigger}</div>
+  ),
+}));
+
+vi.mock("@/components/mission-control/GlobalAgentRoster", () => ({
+  GlobalAgentRoster: (props: unknown): React.JSX.Element => {
+    mockGlobalAgentRoster(props);
+    return <div data-testid="global-agent-roster" />;
+  },
+}));
+
+vi.mock("@/components/mission-control/MissionControlPanel", () => ({
+  MissionControlPanel: (props: unknown): React.JSX.Element => {
+    mockMissionControlPanel(props);
+    return <div data-testid="mission-control-panel" />;
+  },
+  MAX_PANEL_COUNT: 6,
+  MIN_PANEL_COUNT: 1,
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+import { MissionControlLayout } from "./MissionControlLayout";
+
+describe("MissionControlLayout", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+  });
+
+  afterEach((): void => {
+    vi.unstubAllGlobals();
+  });
+
+  it("renders without crashing", (): void => {
+    render(<MissionControlLayout />);
+
+    expect(screen.getByRole("region", { name: "Mission Control" })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "Audit Log" })).toBeInTheDocument();
+  });
+
+  it("renders sidebar and panel grid container", (): void => {
+    render(<MissionControlLayout />);
+
+    const region = screen.getByRole("region", { name: "Mission Control" });
+
+    expect(region.querySelector(".grid")).toBeInTheDocument();
+    expect(region.querySelector("aside")).toBeInTheDocument();
+    expect(region.querySelector("main")).toBeInTheDocument();
+    expect(screen.getByTestId("global-agent-roster")).toBeInTheDocument();
+    expect(screen.getByTestId("mission-control-panel")).toBeInTheDocument();
+  });
+});

apps/web/src/components/mission-control/MissionControlLayout.tsx

@@ -0,0 +1,115 @@
+"use client";
+
+import { useCallback, useState } from "react";
+import { AuditLogDrawer } from "@/components/mission-control/AuditLogDrawer";
+import { GlobalAgentRoster } from "@/components/mission-control/GlobalAgentRoster";
+import {
+  MAX_PANEL_COUNT,
+  MIN_PANEL_COUNT,
+  MissionControlPanel,
+  type PanelConfig,
+} from "@/components/mission-control/MissionControlPanel";
+import { Button } from "@/components/ui/button";
+
+const INITIAL_PANELS: PanelConfig[] = [{}];
+
+export function MissionControlLayout(): React.JSX.Element {
+  const [panels, setPanels] = useState<PanelConfig[]>(INITIAL_PANELS);
+  const [selectedSessionId, setSelectedSessionId] = useState<string>();
+
+  const handleSelectSession = useCallback((sessionId: string): void => {
+    setSelectedSessionId(sessionId);
+
+    setPanels((currentPanels) => {
+      if (currentPanels.some((panel) => panel.sessionId === sessionId)) {
+        return currentPanels;
+      }
+
+      const firstEmptyPanelIndex = currentPanels.findIndex(
+        (panel) => panel.sessionId === undefined
+      );
+      if (firstEmptyPanelIndex >= 0) {
+        return currentPanels.map((panel, index) =>
+          index === firstEmptyPanelIndex ? { ...panel, sessionId } : panel
+        );
+      }
+
+      if (currentPanels.length >= MAX_PANEL_COUNT) {
+        return currentPanels;
+      }
+
+      return [...currentPanels, { sessionId }];
+    });
+  }, []);
+
+  const handleAddPanel = useCallback((): void => {
+    setPanels((currentPanels) => {
+      if (currentPanels.length >= MAX_PANEL_COUNT) {
+        return currentPanels;
+      }
+
+      return [...currentPanels, {}];
+    });
+  }, []);
+
+  const handleRemovePanel = useCallback((panelIndex: number): void => {
+    setPanels((currentPanels) => {
+      if (panelIndex < 0 || panelIndex >= currentPanels.length) {
+        return currentPanels;
+      }
+
+      if (currentPanels.length <= MIN_PANEL_COUNT) {
+        return currentPanels;
+      }
+
+      const nextPanels = currentPanels.filter((_, index) => index !== panelIndex);
+      return nextPanels.length === 0 ? INITIAL_PANELS : nextPanels;
+    });
+  }, []);
+
+  const handleExpandPanel = useCallback((panelIndex: number): void => {
+    setPanels((currentPanels) => {
+      if (panelIndex < 0 || panelIndex >= currentPanels.length) {
+        return currentPanels;
+      }
+
+      const shouldExpand = !currentPanels[panelIndex]?.expanded;
+
+      return currentPanels.map((panel, index) => ({
+        ...panel,
+        expanded: shouldExpand && index === panelIndex,
+      }));
+    });
+  }, []);
+
+  return (
+    <section className="flex h-full min-h-0 flex-col overflow-hidden" aria-label="Mission Control">
+      <header className="mb-3 flex items-center justify-end">
+        <AuditLogDrawer
+          trigger={
+            <Button variant="outline" size="sm">
+              Audit Log
+            </Button>
+          }
+        />
+      </header>
+
+      <div className="grid min-h-0 flex-1 gap-4 xl:grid-cols-[280px_minmax(0,1fr)]">
+        <aside className="h-full min-h-0">
+          <GlobalAgentRoster
+            onSelectSession={handleSelectSession}
+            {...(selectedSessionId !== undefined ? { selectedSessionId } : {})}
+          />
+        </aside>
+        <main className="h-full min-h-0 overflow-hidden">
+          <MissionControlPanel
+            panels={panels}
+            onAddPanel={handleAddPanel}
+            onRemovePanel={handleRemovePanel}
+            onExpandPanel={handleExpandPanel}
+          />
+        </main>
+      </div>
+    </section>
+  );
+}

apps/web/src/components/mission-control/MissionControlPanel.test.tsx

@@ -0,0 +1,153 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import type { ButtonHTMLAttributes, ReactNode } from "react";
+import { MAX_PANEL_COUNT, MissionControlPanel, type PanelConfig } from "./MissionControlPanel";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+interface MockOrchestratorPanelProps {
+  sessionId?: string;
+  onClose?: () => void;
+  closeDisabled?: boolean;
+  onExpand?: () => void;
+  expanded?: boolean;
+}
+
+const mockOrchestratorPanel = vi.fn<(props: MockOrchestratorPanelProps) => React.JSX.Element>();
+
+vi.mock("@/components/mission-control/OrchestratorPanel", () => ({
+  OrchestratorPanel: (props: MockOrchestratorPanelProps): React.JSX.Element =>
+    mockOrchestratorPanel(props),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+function buildPanels(count: number): PanelConfig[] {
+  return Array.from({ length: count }, (_, index) => ({
+    sessionId: `session-${String(index + 1)}`,
+  }));
+}
+
+describe("MissionControlPanel", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+
+    mockOrchestratorPanel.mockImplementation(
+      ({ sessionId, closeDisabled, expanded }: MockOrchestratorPanelProps): React.JSX.Element => (
+        <div
+          data-testid="orchestrator-panel"
+          data-session-id={sessionId ?? ""}
+          data-close-disabled={String(closeDisabled ?? false)}
+          data-expanded={String(expanded ?? false)}
+        />
+      )
+    );
+  });
+
+  it("renders the panel grid and default heading", (): void => {
+    render(
+      <MissionControlPanel
+        panels={[{}]}
+        onAddPanel={vi.fn<() => void>()}
+        onRemovePanel={vi.fn<(index: number) => void>()}
+        onExpandPanel={vi.fn<(index: number) => void>()}
+      />
+    );
+
+    expect(screen.getByRole("heading", { name: "Panels" })).toBeInTheDocument();
+    expect(screen.getAllByTestId("orchestrator-panel")).toHaveLength(1);
+  });
+
+  it("calls onAddPanel when the add button is clicked", (): void => {
+    const onAddPanel = vi.fn<() => void>();
+
+    render(
+      <MissionControlPanel
+        panels={[{}]}
+        onAddPanel={onAddPanel}
+        onRemovePanel={vi.fn<(index: number) => void>()}
+        onExpandPanel={vi.fn<(index: number) => void>()}
+      />
+    );
+
+    fireEvent.click(screen.getByRole("button", { name: "Add panel" }));
+
+    expect(onAddPanel).toHaveBeenCalledTimes(1);
+  });
+
+  it("disables add panel at the configured maximum", (): void => {
+    render(
+      <MissionControlPanel
+        panels={buildPanels(MAX_PANEL_COUNT)}
+        onAddPanel={vi.fn<() => void>()}
+        onRemovePanel={vi.fn<(index: number) => void>()}
+        onExpandPanel={vi.fn<(index: number) => void>()}
+      />
+    );
+
+    const addButton = screen.getByRole("button", { name: "Add panel" });
+
+    expect(addButton).toBeDisabled();
+    expect(addButton).toHaveAttribute("title", "Maximum of 6 panels");
+  });
+
+  it("passes closeDisabled=false when more than one panel exists", (): void => {
+    render(
+      <MissionControlPanel
+        panels={buildPanels(2)}
+        onAddPanel={vi.fn<() => void>()}
+        onRemovePanel={vi.fn<(index: number) => void>()}
+        onExpandPanel={vi.fn<(index: number) => void>()}
+      />
+    );
+
+    const renderedPanels = screen.getAllByTestId("orchestrator-panel");
+    expect(renderedPanels).toHaveLength(2);
+
+    for (const panel of renderedPanels) {
+      expect(panel).toHaveAttribute("data-close-disabled", "false");
+    }
+  });
+
+  it("renders only the expanded panel in focused mode", (): void => {
+    render(
+      <MissionControlPanel
+        panels={[{ sessionId: "session-1" }, { sessionId: "session-2", expanded: true }]}
+        onAddPanel={vi.fn<() => void>()}
+        onRemovePanel={vi.fn<(index: number) => void>()}
+        onExpandPanel={vi.fn<(index: number) => void>()}
+      />
+    );
+
+    const renderedPanels = screen.getAllByTestId("orchestrator-panel");
+
+    expect(renderedPanels).toHaveLength(1);
+    expect(renderedPanels[0]).toHaveAttribute("data-session-id", "session-2");
+    expect(renderedPanels[0]).toHaveAttribute("data-expanded", "true");
+  });
+
+  it("handles Escape key by toggling expanded panel", async (): Promise<void> => {
+    const onExpandPanel = vi.fn<(index: number) => void>();
+
+    render(
+      <MissionControlPanel
+        panels={[{ sessionId: "session-1", expanded: true }, { sessionId: "session-2" }]}
+        onAddPanel={vi.fn<() => void>()}
+        onRemovePanel={vi.fn<(index: number) => void>()}
+        onExpandPanel={onExpandPanel}
+      />
+    );
+
+    fireEvent.keyDown(window, { key: "Escape" });
+
+    await waitFor((): void => {
+      expect(onExpandPanel).toHaveBeenCalledWith(0);
+    });
+  });
+});

apps/web/src/components/mission-control/MissionControlPanel.tsx

@@ -0,0 +1,107 @@
+"use client";
+
+import { useEffect } from "react";
+import { OrchestratorPanel } from "@/components/mission-control/OrchestratorPanel";
+import { Button } from "@/components/ui/button";
+
+export interface PanelConfig {
+  sessionId?: string;
+  expanded?: boolean;
+}
+
+interface MissionControlPanelProps {
+  panels: PanelConfig[];
+  onAddPanel: () => void;
+  onRemovePanel: (index: number) => void;
+  onExpandPanel: (index: number) => void;
+}
+
+export const MIN_PANEL_COUNT = 1;
+export const MAX_PANEL_COUNT = 6;
+
+export function MissionControlPanel({
+  panels,
+  onAddPanel,
+  onRemovePanel,
+  onExpandPanel,
+}: MissionControlPanelProps): React.JSX.Element {
+  const expandedPanelIndex = panels.findIndex((panel) => panel.expanded);
+  const expandedPanel = expandedPanelIndex >= 0 ? panels[expandedPanelIndex] : undefined;
+  const canAddPanel = panels.length < MAX_PANEL_COUNT;
+  const canRemovePanel = panels.length > MIN_PANEL_COUNT;
+
+  useEffect(() => {
+    if (expandedPanelIndex < 0) {
+      return;
+    }
+
+    const handleKeyDown = (event: KeyboardEvent): void => {
+      if (event.key === "Escape") {
+        onExpandPanel(expandedPanelIndex);
+      }
+    };
+
+    window.addEventListener("keydown", handleKeyDown);
+
+    return (): void => {
+      window.removeEventListener("keydown", handleKeyDown);
+    };
+  }, [expandedPanelIndex, onExpandPanel]);
+
+  return (
+    <div className="flex h-full min-h-0 flex-col gap-3">
+      <div className="flex items-center justify-between">
+        <h2 className="text-sm font-medium text-muted-foreground">Panels</h2>
+        <Button
+          type="button"
+          variant="outline"
+          size="icon"
+          onClick={onAddPanel}
+          disabled={!canAddPanel}
+          aria-label="Add panel"
+          title={canAddPanel ? "Add panel" : "Maximum of 6 panels"}
+        >
+          <span aria-hidden="true" className="text-lg leading-none">
+            +
+          </span>
+        </Button>
+      </div>
+      <div className="min-h-0 flex-1">
+        {expandedPanelIndex >= 0 && expandedPanel ? (
+          <div className="h-full min-h-0">
+            <OrchestratorPanel
+              {...(expandedPanel.sessionId !== undefined
+                ? { sessionId: expandedPanel.sessionId }
+                : {})}
+              onClose={() => {
+                onRemovePanel(expandedPanelIndex);
+              }}
+              closeDisabled={!canRemovePanel}
+              onExpand={() => {
+                onExpandPanel(expandedPanelIndex);
+              }}
+              expanded
+            />
+          </div>
+        ) : (
+          <div className="grid h-full min-h-0 auto-rows-fr grid-cols-1 gap-4 overflow-y-auto pr-1 md:grid-cols-2 xl:grid-cols-3">
+            {panels.map((panel, index) => (
+              <OrchestratorPanel
+                key={`panel-${String(index)}`}
+                {...(panel.sessionId !== undefined ? { sessionId: panel.sessionId } : {})}
+                onClose={() => {
+                  onRemovePanel(index);
+                }}
+                closeDisabled={!canRemovePanel}
+                onExpand={() => {
+                  onExpandPanel(index);
+                }}
+                expanded={panel.expanded ?? false}
+              />
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

apps/web/src/components/mission-control/OrchestratorPanel.test.tsx

@@ -0,0 +1,218 @@
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+import type { ButtonHTMLAttributes, HTMLAttributes, ReactNode } from "react";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+interface MockContainerProps extends HTMLAttributes<HTMLElement> {
+  children: ReactNode;
+}
+
+type MockConnectionStatus = "connected" | "connecting" | "error";
+type MockRole = "user" | "assistant" | "tool" | "system";
+
+interface MockMessage {
+  id: string;
+  role: MockRole;
+  content: string;
+  timestamp: string;
+}
+
+interface MockSession {
+  id: string;
+  status: string;
+}
+
+interface MockSessionStreamResult {
+  messages: MockMessage[];
+  status: MockConnectionStatus;
+  error: string | null;
+}
+
+interface MockSessionsResult {
+  sessions: MockSession[];
+  loading: boolean;
+  error: Error | null;
+}
+
+interface MockPanelControlsProps {
+  sessionId: string;
+  status: string;
+  onStatusChange?: (nextStatus: string) => void;
+}
+
+interface MockBargeInInputProps {
+  sessionId: string;
+}
+
+const mockUseSessionStream = vi.fn<(sessionId: string) => MockSessionStreamResult>();
+const mockUseSessions = vi.fn<() => MockSessionsResult>();
+const mockPanelControls = vi.fn<(props: MockPanelControlsProps) => React.JSX.Element>();
+const mockBargeInInput = vi.fn<(props: MockBargeInInputProps) => React.JSX.Element>();
+
+vi.mock("date-fns", () => ({
+  formatDistanceToNow: (): string => "moments ago",
+}));
+
+vi.mock("@/hooks/useMissionControl", () => ({
+  useSessionStream: (sessionId: string): MockSessionStreamResult => mockUseSessionStream(sessionId),
+  useSessions: (): MockSessionsResult => mockUseSessions(),
+}));
+
+vi.mock("@/components/mission-control/PanelControls", () => ({
+  PanelControls: (props: MockPanelControlsProps): React.JSX.Element => mockPanelControls(props),
+}));
+
+vi.mock("@/components/mission-control/BargeInInput", () => ({
+  BargeInInput: (props: MockBargeInInputProps): React.JSX.Element => mockBargeInInput(props),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+vi.mock("@/components/ui/badge", () => ({
+  Badge: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <span {...props}>{children}</span>
+  ),
+}));
+
+vi.mock("@/components/ui/card", () => ({
+  Card: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <section {...props}>{children}</section>
+  ),
+  CardHeader: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <header {...props}>{children}</header>
+  ),
+  CardContent: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <div {...props}>{children}</div>
+  ),
+  CardTitle: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <h2 {...props}>{children}</h2>
+  ),
+}));
+
+vi.mock("@/components/ui/scroll-area", () => ({
+  ScrollArea: ({ children, ...props }: MockContainerProps): React.JSX.Element => (
+    <div {...props}>{children}</div>
+  ),
+}));
+
+import { OrchestratorPanel } from "./OrchestratorPanel";
+
+beforeAll((): void => {
+  Object.defineProperty(window.HTMLElement.prototype, "scrollIntoView", {
+    configurable: true,
+    value: vi.fn(),
+  });
+});
+
+describe("OrchestratorPanel", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+
+    mockUseSessionStream.mockReturnValue({
+      messages: [],
+      status: "connecting",
+      error: null,
+    });
+
+    mockUseSessions.mockReturnValue({
+      sessions: [],
+      loading: false,
+      error: null,
+    });
+
+    mockPanelControls.mockImplementation(
+      ({ status }: MockPanelControlsProps): React.JSX.Element => (
+        <div data-testid="panel-controls">status:{status}</div>
+      )
+    );
+
+    mockBargeInInput.mockImplementation(
+      ({ sessionId }: MockBargeInInputProps): React.JSX.Element => (
+        <textarea aria-label="barge-input" data-session-id={sessionId} />
+      )
+    );
+  });
+
+  afterEach((): void => {
+    vi.unstubAllGlobals();
+  });
+
+  it("renders a selectable empty state when no session is provided", (): void => {
+    render(<OrchestratorPanel />);
+
+    expect(screen.getByText("Select an agent to view its stream")).toBeInTheDocument();
+    expect(screen.queryByText("Session: session-1")).not.toBeInTheDocument();
+  });
+
+  it("renders connection indicator and panel controls for an active session", (): void => {
+    mockUseSessionStream.mockReturnValue({
+      messages: [],
+      status: "connected",
+      error: null,
+    });
+
+    mockUseSessions.mockReturnValue({
+      sessions: [{ id: "session-1", status: "paused" }],
+      loading: false,
+      error: null,
+    });
+
+    render(<OrchestratorPanel sessionId="session-1" />);
+
+    expect(screen.getByText("Connected")).toBeInTheDocument();
+    expect(screen.getByText("Session: session-1")).toBeInTheDocument();
+    expect(screen.getByText("Waiting for messages...")).toBeInTheDocument();
+    expect(screen.getByTestId("panel-controls")).toHaveTextContent("status:paused");
+  });
+
+  it("renders stream messages with role and content", (): void => {
+    mockUseSessionStream.mockReturnValue({
+      status: "connected",
+      error: null,
+      messages: [
+        {
+          id: "msg-1",
+          role: "assistant",
+          content: "Mission accepted.",
+          timestamp: "2026-03-07T18:42:00.000Z",
+        },
+      ],
+    });
+
+    render(<OrchestratorPanel sessionId="session-2" />);
+
+    expect(screen.getByText("assistant")).toBeInTheDocument();
+    expect(screen.getByText("Mission accepted.")).toBeInTheDocument();
+    expect(screen.getByText("moments ago")).toBeInTheDocument();
+    expect(screen.getByLabelText("barge-input")).toHaveAttribute("data-session-id", "session-2");
+  });
+
+  it("renders stream error text when the session has no messages", (): void => {
+    mockUseSessionStream.mockReturnValue({
+      messages: [],
+      status: "error",
+      error: "Mission Control stream disconnected.",
+    });
+
+    render(<OrchestratorPanel sessionId="session-3" />);
+
+    expect(screen.getByText("Error")).toBeInTheDocument();
+    expect(screen.getByText("Mission Control stream disconnected.")).toBeInTheDocument();
+  });
+
+  it("respects close button disabled state in panel actions", (): void => {
+    const onClose = vi.fn<() => void>();
+
+    render(<OrchestratorPanel onClose={onClose} closeDisabled />);
+
+    expect(screen.getByRole("button", { name: "Remove panel" })).toBeDisabled();
+  });
+});

apps/web/src/components/mission-control/OrchestratorPanel.tsx

@@ -0,0 +1,217 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+import { formatDistanceToNow } from "date-fns";
+import { BargeInInput } from "@/components/mission-control/BargeInInput";
+import { Badge } from "@/components/ui/badge";
+import type { BadgeVariant } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { PanelControls } from "@/components/mission-control/PanelControls";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import {
+  useSessionStream,
+  useSessions,
+  type MissionControlConnectionStatus,
+  type MissionControlMessageRole,
+} from "@/hooks/useMissionControl";
+
+const ROLE_BADGE_VARIANT: Record<MissionControlMessageRole, BadgeVariant> = {
+  user: "badge-blue",
+  assistant: "status-success",
+  tool: "badge-amber",
+  system: "badge-muted",
+};
+
+const CONNECTION_DOT_CLASS: Record<MissionControlConnectionStatus, string> = {
+  connected: "bg-emerald-500",
+  connecting: "bg-amber-500",
+  error: "bg-red-500",
+};
+
+const CONNECTION_TEXT: Record<MissionControlConnectionStatus, string> = {
+  connected: "Connected",
+  connecting: "Connecting",
+  error: "Error",
+};
+
+export interface OrchestratorPanelProps {
+  sessionId?: string;
+  onClose?: () => void;
+  closeDisabled?: boolean;
+  onExpand?: () => void;
+  expanded?: boolean;
+}
+
+interface PanelHeaderActionsProps {
+  onClose?: () => void;
+  closeDisabled?: boolean;
+  onExpand?: () => void;
+  expanded?: boolean;
+}
+
+function PanelHeaderActions({
+  onClose,
+  closeDisabled = false,
+  onExpand,
+  expanded = false,
+}: PanelHeaderActionsProps): React.JSX.Element | null {
+  if (!onClose && !onExpand) {
+    return null;
+  }
+
+  return (
+    <div className="flex items-center gap-1">
+      {onExpand ? (
+        <Button
+          type="button"
+          variant="ghost"
+          size="icon"
+          className="h-7 w-7"
+          onClick={onExpand}
+          aria-label={expanded ? "Collapse panel" : "Expand panel"}
+          title={expanded ? "Collapse panel" : "Expand panel"}
+        >
+          <span aria-hidden="true" className="text-base leading-none">
+            {expanded ? "↙" : "↗"}
+          </span>
+        </Button>
+      ) : null}
+      {onClose ? (
+        <Button
+          type="button"
+          variant="ghost"
+          size="icon"
+          className="h-7 w-7"
+          onClick={onClose}
+          disabled={closeDisabled}
+          aria-label="Remove panel"
+          title="Remove panel"
+        >
+          <span aria-hidden="true" className="text-base leading-none">
+            ×
+          </span>
+        </Button>
+      ) : null}
+    </div>
+  );
+}
+
+function formatRelativeTimestamp(timestamp: string): string {
+  const parsedDate = new Date(timestamp);
+  if (Number.isNaN(parsedDate.getTime())) {
+    return "just now";
+  }
+
+  return formatDistanceToNow(parsedDate, { addSuffix: true });
+}
+
+export function OrchestratorPanel({
+  sessionId,
+  onClose,
+  closeDisabled,
+  onExpand,
+  expanded,
+}: OrchestratorPanelProps): React.JSX.Element {
+  const { messages, status, error } = useSessionStream(sessionId ?? "");
+  const { sessions } = useSessions();
+  const bottomAnchorRef = useRef<HTMLDivElement | null>(null);
+  const [optimisticStatus, setOptimisticStatus] = useState<string | null>(null);
+
+  const selectedSessionStatus = sessions.find((session) => session.id === sessionId)?.status;
+  const controlsStatus = optimisticStatus ?? selectedSessionStatus ?? "unknown";
+  const panelHeaderActionProps = {
+    ...(onClose !== undefined ? { onClose } : {}),
+    ...(closeDisabled !== undefined ? { closeDisabled } : {}),
+    ...(onExpand !== undefined ? { onExpand } : {}),
+    ...(expanded !== undefined ? { expanded } : {}),
+  };
+
+  useEffect(() => {
+    bottomAnchorRef.current?.scrollIntoView({ block: "end" });
+  }, [messages.length]);
+
+  useEffect(() => {
+    setOptimisticStatus(null);
+  }, [sessionId, selectedSessionStatus]);
+
+  if (!sessionId) {
+    return (
+      <Card className="flex h-full min-h-[220px] flex-col">
+        <CardHeader>
+          <div className="flex items-start justify-between gap-2">
+            <CardTitle className="text-base">Orchestrator Panel</CardTitle>
+            <PanelHeaderActions {...panelHeaderActionProps} />
+          </div>
+        </CardHeader>
+        <CardContent className="flex flex-1 items-center justify-center text-sm text-muted-foreground">
+          Select an agent to view its stream
+        </CardContent>
+      </Card>
+    );
+  }
+
+  return (
+    <Card className="flex h-full min-h-[220px] flex-col">
+      <CardHeader className="space-y-2">
+        <div className="flex items-start justify-between gap-2">
+          <CardTitle className="text-base">Orchestrator Panel</CardTitle>
+          <PanelHeaderActions {...panelHeaderActionProps} />
+        </div>
+        <div className="flex flex-col gap-2 sm:flex-row sm:items-start sm:justify-between">
+          <div className="flex items-center gap-2 text-xs text-muted-foreground">
+            <span
+              className={`h-2.5 w-2.5 rounded-full ${CONNECTION_DOT_CLASS[status]} ${
+                status === "connecting" ? "animate-pulse" : ""
+              }`}
+              aria-hidden="true"
+            />
+            <span>{CONNECTION_TEXT[status]}</span>
+          </div>
+          <PanelControls
+            sessionId={sessionId}
+            status={controlsStatus}
+            onStatusChange={setOptimisticStatus}
+          />
+        </div>
+        <p className="truncate text-xs text-muted-foreground">Session: {sessionId}</p>
+      </CardHeader>
+      <CardContent className="flex min-h-0 flex-1 flex-col p-0">
+        <div className="min-h-0 flex-1">
+          <ScrollArea className="h-full w-full">
+            <div className="flex min-h-full flex-col gap-3 p-4">
+              {messages.length === 0 ? (
+                <p className="mt-6 text-center text-sm text-muted-foreground">
+                  {error ?? "Waiting for messages..."}
+                </p>
+              ) : (
+                messages.map((message) => (
+                  <article
+                    key={message.id}
+                    className="rounded-lg border border-border/70 bg-card px-3 py-2"
+                  >
+                    <div className="mb-2 flex items-center justify-between gap-2">
+                      <Badge variant={ROLE_BADGE_VARIANT[message.role]} className="uppercase">
+                        {message.role}
+                      </Badge>
+                      <time className="text-xs text-muted-foreground">
+                        {formatRelativeTimestamp(message.timestamp)}
+                      </time>
+                    </div>
+                    <p className="whitespace-pre-wrap break-words text-sm text-foreground">
+                      {message.content}
+                    </p>
+                  </article>
+                ))
+              )}
+              <div ref={bottomAnchorRef} />
+            </div>
+          </ScrollArea>
+        </div>
+        <div className="border-t border-border/70 p-3">
+          <BargeInInput sessionId={sessionId} />
+        </div>
+      </CardContent>
+    </Card>
+  );
+}

apps/web/src/components/mission-control/PanelControls.test.tsx

@@ -0,0 +1,161 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import type { ButtonHTMLAttributes, HTMLAttributes, ReactNode } from "react";
+
+interface MockButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  children: ReactNode;
+}
+
+interface MockBadgeProps extends HTMLAttributes<HTMLElement> {
+  children: ReactNode;
+}
+
+const mockApiPost = vi.fn<(endpoint: string, body?: unknown) => Promise<{ message: string }>>();
+
+vi.mock("@/lib/api/client", () => ({
+  apiPost: (endpoint: string, body?: unknown): Promise<{ message: string }> =>
+    mockApiPost(endpoint, body),
+}));
+
+vi.mock("@/components/ui/button", () => ({
+  Button: ({ children, ...props }: MockButtonProps): React.JSX.Element => (
+    <button {...props}>{children}</button>
+  ),
+}));
+
+vi.mock("@/components/ui/badge", () => ({
+  Badge: ({ children, ...props }: MockBadgeProps): React.JSX.Element => (
+    <span {...props}>{children}</span>
+  ),
+}));
+
+import { PanelControls } from "./PanelControls";
+
+function renderWithQueryClient(ui: React.JSX.Element): ReturnType<typeof render> {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+
+  return render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+describe("PanelControls", (): void => {
+  beforeEach((): void => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+    mockApiPost.mockResolvedValue({ message: "ok" });
+  });
+
+  afterEach((): void => {
+    vi.unstubAllGlobals();
+  });
+
+  it("renders action buttons with correct disabled state for active sessions", (): void => {
+    renderWithQueryClient(<PanelControls sessionId="session-1" status="active" />);
+
+    expect(screen.getByRole("button", { name: "Pause session" })).toBeEnabled();
+    expect(screen.getByRole("button", { name: "Resume session" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Gracefully kill session" })).toBeEnabled();
+    expect(screen.getByRole("button", { name: "Force kill session" })).toBeEnabled();
+  });
+
+  it("disables all action buttons when session is already killed", (): void => {
+    renderWithQueryClient(<PanelControls sessionId="session-2" status="killed" />);
+
+    expect(screen.getByRole("button", { name: "Pause session" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Resume session" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Gracefully kill session" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Force kill session" })).toBeDisabled();
+  });
+
+  it("pauses a running session and reports the next status", async (): Promise<void> => {
+    const onStatusChange = vi.fn<(status: string) => void>();
+    const user = userEvent.setup();
+
+    renderWithQueryClient(
+      <PanelControls
+        sessionId="session with space"
+        status="active"
+        onStatusChange={onStatusChange}
+      />
+    );
+
+    await user.click(screen.getByRole("button", { name: "Pause session" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith(
+        "/api/mission-control/sessions/session%20with%20space/pause",
+        undefined
+      );
+    });
+
+    expect(onStatusChange).toHaveBeenCalledWith("paused");
+  });
+
+  it("asks for graceful kill confirmation before submitting", async (): Promise<void> => {
+    const onStatusChange = vi.fn<(status: string) => void>();
+    const user = userEvent.setup();
+
+    renderWithQueryClient(
+      <PanelControls sessionId="session-4" status="active" onStatusChange={onStatusChange} />
+    );
+
+    await user.click(screen.getByRole("button", { name: "Gracefully kill session" }));
+
+    expect(
+      screen.getByText("Gracefully stop this agent after it finishes the current step?")
+    ).toBeInTheDocument();
+
+    await user.click(screen.getByRole("button", { name: "Confirm" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/session-4/kill", {
+        force: false,
+      });
+    });
+
+    expect(onStatusChange).toHaveBeenCalledWith("killed");
+  });
+
+  it("sends force kill after confirmation", async (): Promise<void> => {
+    const onStatusChange = vi.fn<(status: string) => void>();
+    const user = userEvent.setup();
+
+    renderWithQueryClient(
+      <PanelControls sessionId="session-5" status="paused" onStatusChange={onStatusChange} />
+    );
+
+    await user.click(screen.getByRole("button", { name: "Force kill session" }));
+
+    expect(screen.getByText("This will hard-kill the agent immediately.")).toBeInTheDocument();
+
+    await user.click(screen.getByRole("button", { name: "Confirm" }));
+
+    await waitFor((): void => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/session-5/kill", {
+        force: true,
+      });
+    });
+
+    expect(onStatusChange).toHaveBeenCalledWith("killed");
+  });
+
+  it("shows an error badge when an action fails", async (): Promise<void> => {
+    const user = userEvent.setup();
+
+    mockApiPost.mockRejectedValueOnce(new Error("unable to pause"));
+
+    renderWithQueryClient(<PanelControls sessionId="session-6" status="active" />);
+
+    await user.click(screen.getByRole("button", { name: "Pause session" }));
+
+    await waitFor((): void => {
+      expect(screen.getByText("unable to pause")).toBeInTheDocument();
+    });
+  });
+});

apps/web/src/components/mission-control/PanelControls.tsx

@@ -0,0 +1,259 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { Loader2 } from "lucide-react";
+import { Badge } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { apiPost } from "@/lib/api/client";
+
+const SESSIONS_QUERY_KEY = ["mission-control", "sessions"] as const;
+
+type PanelAction = "pause" | "resume" | "graceful-kill" | "force-kill";
+type KillConfirmationState = "graceful" | "force" | null;
+
+interface PanelActionResult {
+  nextStatus: string;
+}
+
+export interface PanelControlsProps {
+  sessionId: string;
+  // eslint-disable-next-line @typescript-eslint/no-redundant-type-constituents
+  status: "active" | "paused" | "killed" | string;
+  onStatusChange?: (newStatus: string) => void;
+}
+
+function getErrorMessage(error: unknown): string {
+  if (error instanceof Error && error.message.trim().length > 0) {
+    return error.message;
+  }
+
+  return "Failed to update agent session.";
+}
+
+export function PanelControls({
+  sessionId,
+  status,
+  onStatusChange,
+}: PanelControlsProps): React.JSX.Element {
+  const queryClient = useQueryClient();
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+  const [confirmingKill, setConfirmingKill] = useState<KillConfirmationState>(null);
+
+  useEffect(() => {
+    setErrorMessage(null);
+    setConfirmingKill(null);
+  }, [sessionId]);
+
+  const controlMutation = useMutation({
+    mutationFn: async (action: PanelAction): Promise<PanelActionResult> => {
+      switch (action) {
+        case "pause":
+          await apiPost<{ message: string }>(
+            `/api/mission-control/sessions/${encodeURIComponent(sessionId)}/pause`
+          );
+          return { nextStatus: "paused" };
+        case "resume":
+          await apiPost<{ message: string }>(
+            `/api/mission-control/sessions/${encodeURIComponent(sessionId)}/resume`
+          );
+          return { nextStatus: "active" };
+        case "graceful-kill":
+          await apiPost<{ message: string }>(
+            `/api/mission-control/sessions/${encodeURIComponent(sessionId)}/kill`,
+            { force: false }
+          );
+          return { nextStatus: "killed" };
+        case "force-kill":
+          await apiPost<{ message: string }>(
+            `/api/mission-control/sessions/${encodeURIComponent(sessionId)}/kill`,
+            { force: true }
+          );
+          return { nextStatus: "killed" };
+      }
+    },
+    onSuccess: ({ nextStatus }): void => {
+      setErrorMessage(null);
+      setConfirmingKill(null);
+      onStatusChange?.(nextStatus);
+      void queryClient.invalidateQueries({ queryKey: SESSIONS_QUERY_KEY });
+    },
+    onError: (error: unknown): void => {
+      setConfirmingKill(null);
+      setErrorMessage(getErrorMessage(error));
+    },
+  });
+
+  const normalizedStatus = status.toLowerCase();
+  const isKilled = normalizedStatus === "killed";
+  const isBusy = controlMutation.isPending;
+  const pendingAction = isBusy ? controlMutation.variables : undefined;
+
+  const submitAction = (action: PanelAction): void => {
+    setErrorMessage(null);
+    controlMutation.mutate(action);
+  };
+
+  const pauseDisabled = isBusy || normalizedStatus === "paused" || isKilled;
+  const resumeDisabled = isBusy || normalizedStatus === "active" || isKilled;
+  const gracefulKillDisabled = isBusy || isKilled;
+  const forceKillDisabled = isBusy || isKilled;
+
+  return (
+    <div className="flex flex-col items-end gap-2">
+      <div className="flex flex-wrap items-center justify-end gap-1.5">
+        <Button
+          type="button"
+          size="sm"
+          variant="secondary"
+          onClick={() => {
+            submitAction("pause");
+          }}
+          disabled={pauseDisabled}
+          aria-label="Pause session"
+        >
+          {pendingAction === "pause" ? (
+            <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
+          ) : (
+            <span aria-hidden="true">⏸</span>
+          )}
+          <span>Pause</span>
+        </Button>
+
+        <Button
+          type="button"
+          size="sm"
+          variant="secondary"
+          onClick={() => {
+            submitAction("resume");
+          }}
+          disabled={resumeDisabled}
+          aria-label="Resume session"
+        >
+          {pendingAction === "resume" ? (
+            <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
+          ) : (
+            <span aria-hidden="true">▶</span>
+          )}
+          <span>Resume</span>
+        </Button>
+
+        <div className="relative">
+          <Button
+            type="button"
+            size="sm"
+            variant="secondary"
+            onClick={() => {
+              setErrorMessage(null);
+              setConfirmingKill((current) => (current === "graceful" ? null : "graceful"));
+            }}
+            disabled={gracefulKillDisabled}
+            aria-label="Gracefully kill session"
+          >
+            {pendingAction === "graceful-kill" ? (
+              <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
+            ) : (
+              <span aria-hidden="true">⏹</span>
+            )}
+            <span>Graceful Kill</span>
+          </Button>
+          {confirmingKill === "graceful" ? (
+            <div className="absolute right-0 top-[calc(100%+0.375rem)] z-20 w-72 rounded-md border border-border bg-card p-2 shadow-lg">
+              <p className="text-xs text-muted-foreground">
+                Gracefully stop this agent after it finishes the current step?
+              </p>
+              <div className="mt-2 flex justify-end gap-1.5">
+                <Button
+                  type="button"
+                  size="sm"
+                  variant="ghost"
+                  onClick={() => {
+                    setConfirmingKill(null);
+                  }}
+                  disabled={isBusy}
+                >
+                  Cancel
+                </Button>
+                <Button
+                  type="button"
+                  size="sm"
+                  variant="secondary"
+                  onClick={() => {
+                    submitAction("graceful-kill");
+                  }}
+                  disabled={isBusy}
+                >
+                  {pendingAction === "graceful-kill" ? (
+                    <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
+                  ) : null}
+                  <span>Confirm</span>
+                </Button>
+              </div>
+            </div>
+          ) : null}
+        </div>
+
+        <div className="relative">
+          <Button
+            type="button"
+            size="sm"
+            variant="danger"
+            onClick={() => {
+              setErrorMessage(null);
+              setConfirmingKill((current) => (current === "force" ? null : "force"));
+            }}
+            disabled={forceKillDisabled}
+            aria-label="Force kill session"
+          >
+            {pendingAction === "force-kill" ? (
+              <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
+            ) : (
+              <span aria-hidden="true">💀</span>
+            )}
+            <span>Force Kill</span>
+          </Button>
+          {confirmingKill === "force" ? (
+            <div className="absolute right-0 top-[calc(100%+0.375rem)] z-20 w-72 rounded-md border border-border bg-card p-2 shadow-lg">
+              <p className="text-xs text-muted-foreground">
+                This will hard-kill the agent immediately.
+              </p>
+              <div className="mt-2 flex justify-end gap-1.5">
+                <Button
+                  type="button"
+                  size="sm"
+                  variant="ghost"
+                  onClick={() => {
+                    setConfirmingKill(null);
+                  }}
+                  disabled={isBusy}
+                >
+                  Cancel
+                </Button>
+                <Button
+                  type="button"
+                  size="sm"
+                  variant="danger"
+                  onClick={() => {
+                    submitAction("force-kill");
+                  }}
+                  disabled={isBusy}
+                >
+                  {pendingAction === "force-kill" ? (
+                    <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
+                  ) : null}
+                  <span>Confirm</span>
+                </Button>
+              </div>
+            </div>
+          ) : null}
+        </div>
+      </div>
+
+      {errorMessage ? (
+        <Badge variant="status-error" className="max-w-[32rem] whitespace-normal text-xs">
+          {errorMessage}
+        </Badge>
+      ) : null}
+    </div>
+  );
+}

apps/web/src/components/mission-control/__tests__/GlobalAgentRoster.test.tsx

@@ -0,0 +1,133 @@
+import type { ReactElement } from "react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { GlobalAgentRoster } from "../GlobalAgentRoster";
+
+const { mockApiGet, mockApiPost } = vi.hoisted(() => ({
+  mockApiGet: vi.fn(),
+  mockApiPost: vi.fn(),
+}));
+
+vi.mock("@/lib/api/client", () => ({
+  apiGet: mockApiGet,
+  apiPost: mockApiPost,
+}));
+
+function renderWithQueryClient(ui: ReactElement): void {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false, gcTime: 0 },
+      mutations: { retry: false },
+    },
+  });
+
+  render(<QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>);
+}
+
+describe("GlobalAgentRoster (__tests__)", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+    mockApiGet.mockReset();
+    mockApiPost.mockReset();
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("renders empty state when no sessions", async () => {
+    mockApiGet.mockResolvedValueOnce([]);
+
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    expect(await screen.findByText("No active agents")).toBeInTheDocument();
+  });
+
+  it("renders session rows grouped by provider", async () => {
+    mockApiGet.mockResolvedValueOnce([
+      {
+        id: "sess-int-123456",
+        providerId: "internal",
+        providerType: "internal",
+        status: "active",
+        createdAt: "2026-03-07T19:00:00.000Z",
+        updatedAt: "2026-03-07T19:00:00.000Z",
+      },
+      {
+        id: "sess-rem-654321",
+        providerId: "remote-a",
+        providerType: "remote",
+        status: "paused",
+        createdAt: "2026-03-07T19:00:00.000Z",
+        updatedAt: "2026-03-07T19:00:00.000Z",
+      },
+    ]);
+
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    expect(await screen.findByText("internal")).toBeInTheDocument();
+    expect(screen.getByText("remote-a (remote)")).toBeInTheDocument();
+    expect(screen.getByText("sess-int")).toBeInTheDocument();
+    expect(screen.getByText("sess-rem")).toBeInTheDocument();
+  });
+
+  it("kill button per row calls the API", async () => {
+    const user = userEvent.setup();
+
+    mockApiGet.mockResolvedValueOnce([
+      {
+        id: "killme123456",
+        providerId: "internal",
+        providerType: "internal",
+        status: "active",
+        createdAt: "2026-03-07T19:00:00.000Z",
+        updatedAt: "2026-03-07T19:00:00.000Z",
+      },
+    ]);
+
+    mockApiPost.mockResolvedValue({ message: "ok" });
+
+    renderWithQueryClient(<GlobalAgentRoster />);
+
+    const killButton = await screen.findByRole("button", { name: "Kill session killme12" });
+    await user.click(killButton);
+
+    await waitFor(() => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/killme123456/kill", {
+        force: false,
+      });
+    });
+  });
+
+  it("onSelectSession callback fires on row click", async () => {
+    const user = userEvent.setup();
+    const onSelectSession = vi.fn();
+
+    mockApiGet.mockResolvedValueOnce([
+      {
+        id: "selectme123456",
+        providerId: "internal",
+        providerType: "internal",
+        status: "active",
+        createdAt: "2026-03-07T19:00:00.000Z",
+        updatedAt: "2026-03-07T19:00:00.000Z",
+      },
+    ]);
+
+    renderWithQueryClient(<GlobalAgentRoster onSelectSession={onSelectSession} />);
+
+    const sessionLabel = await screen.findByText("selectme");
+    const row = sessionLabel.closest('[role="button"]');
+
+    if (!row) {
+      throw new Error("Expected session row for selectme123456");
+    }
+
+    await user.click(row);
+
+    expect(onSelectSession).toHaveBeenCalledWith("selectme123456");
+  });
+});

apps/web/src/components/mission-control/__tests__/KillAllDialog.test.tsx

@@ -0,0 +1,96 @@
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { AgentSession } from "@mosaic/shared";
+import { KillAllDialog } from "../KillAllDialog";
+import * as apiClient from "@/lib/api/client";
+
+vi.mock("@/lib/api/client", () => ({
+  apiPost: vi.fn(),
+}));
+
+const mockApiPost = vi.mocked(apiClient.apiPost);
+const baseDate = new Date("2026-03-07T14:00:00.000Z");
+
+const sessions: AgentSession[] = [
+  {
+    id: "session-internal-1",
+    providerId: "provider-internal-1",
+    providerType: "internal",
+    status: "active",
+    createdAt: baseDate,
+    updatedAt: baseDate,
+  },
+  {
+    id: "session-internal-2",
+    providerId: "provider-internal-2",
+    providerType: "internal",
+    status: "paused",
+    createdAt: baseDate,
+    updatedAt: baseDate,
+  },
+  {
+    id: "session-external-1",
+    providerId: "provider-openclaw-1",
+    providerType: "openclaw",
+    status: "active",
+    createdAt: baseDate,
+    updatedAt: baseDate,
+  },
+];
+
+describe("KillAllDialog (__tests__)", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+    mockApiPost.mockResolvedValue({ message: "killed" } as never);
+  });
+
+  it('Confirm button disabled until "KILL ALL" typed exactly', async () => {
+    const user = userEvent.setup();
+
+    render(<KillAllDialog sessions={sessions} />);
+
+    await user.click(screen.getByRole("button", { name: "Kill All" }));
+
+    const input = screen.getByLabelText("Type KILL ALL to confirm");
+    const confirmButton = screen.getByRole("button", { name: "Kill All Agents" });
+
+    expect(confirmButton).toBeDisabled();
+
+    await user.type(input, "kill all");
+    expect(confirmButton).toBeDisabled();
+
+    await user.clear(input);
+    await user.type(input, "KILL ALL");
+    expect(confirmButton).toBeEnabled();
+  });
+
+  it("fires kill API for each session on confirm", async () => {
+    const user = userEvent.setup();
+
+    render(<KillAllDialog sessions={sessions} />);
+
+    await user.click(screen.getByRole("button", { name: "Kill All" }));
+    await user.click(screen.getByLabelText("All providers (3)"));
+    await user.type(screen.getByLabelText("Type KILL ALL to confirm"), "KILL ALL");
+    await user.click(screen.getByRole("button", { name: "Kill All Agents" }));
+
+    await waitFor(() => {
+      expect(mockApiPost).toHaveBeenCalledTimes(3);
+    });
+
+    expect(mockApiPost).toHaveBeenCalledWith(
+      "/api/mission-control/sessions/session-internal-1/kill",
+      { force: true }
+    );
+    expect(mockApiPost).toHaveBeenCalledWith(
+      "/api/mission-control/sessions/session-internal-2/kill",
+      { force: true }
+    );
+    expect(mockApiPost).toHaveBeenCalledWith(
+      "/api/mission-control/sessions/session-external-1/kill",
+      { force: true }
+    );
+  });
+});

apps/web/src/components/mission-control/__tests__/OrchestratorPanel.test.tsx

@@ -0,0 +1,93 @@
+import { render, screen } from "@testing-library/react";
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+import { OrchestratorPanel } from "../OrchestratorPanel";
+import * as missionControlHooks from "@/hooks/useMissionControl";
+
+vi.mock("@/hooks/useMissionControl", () => ({
+  useSessionStream: vi.fn(),
+  useSessions: vi.fn(),
+}));
+
+vi.mock("@/components/mission-control/PanelControls", () => ({
+  PanelControls: (): React.JSX.Element => <div data-testid="panel-controls" />,
+}));
+
+vi.mock("@/components/mission-control/BargeInInput", () => ({
+  BargeInInput: ({ sessionId }: { sessionId: string }): React.JSX.Element => (
+    <div data-testid="barge-in-input">barge-in:{sessionId}</div>
+  ),
+}));
+
+vi.mock("date-fns", () => ({
+  formatDistanceToNow: (): string => "moments ago",
+}));
+
+const mockUseSessionStream = vi.mocked(missionControlHooks.useSessionStream);
+const mockUseSessions = vi.mocked(missionControlHooks.useSessions);
+
+beforeAll(() => {
+  Object.defineProperty(window.HTMLElement.prototype, "scrollIntoView", {
+    configurable: true,
+    value: vi.fn(),
+  });
+});
+
+describe("OrchestratorPanel (__tests__)", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+
+    mockUseSessionStream.mockReturnValue({
+      messages: [],
+      status: "connected",
+      error: null,
+    });
+
+    mockUseSessions.mockReturnValue({
+      sessions: [],
+      loading: false,
+      error: null,
+    });
+  });
+
+  it("renders empty state when no sessionId", () => {
+    render(<OrchestratorPanel />);
+
+    expect(screen.getByText("Select an agent to view its stream")).toBeInTheDocument();
+  });
+
+  it("renders connection indicator", () => {
+    const { container } = render(<OrchestratorPanel sessionId="session-1" />);
+
+    expect(screen.getByText("Connected")).toBeInTheDocument();
+    expect(container.querySelector(".bg-emerald-500")).toBeInTheDocument();
+  });
+
+  it("renders message list when messages are present", () => {
+    mockUseSessionStream.mockReturnValue({
+      messages: [
+        {
+          id: "msg-1",
+          sessionId: "session-1",
+          role: "assistant",
+          content: "Mission update one",
+          timestamp: "2026-03-07T21:00:00.000Z",
+        },
+        {
+          id: "msg-2",
+          sessionId: "session-1",
+          role: "tool",
+          content: "Mission update two",
+          timestamp: "2026-03-07T21:00:01.000Z",
+        },
+      ],
+      status: "connected",
+      error: null,
+    });
+
+    render(<OrchestratorPanel sessionId="session-1" />);
+
+    expect(screen.getByText("Mission update one")).toBeInTheDocument();
+    expect(screen.getByText("Mission update two")).toBeInTheDocument();
+    expect(screen.queryByText("Waiting for messages...")).not.toBeInTheDocument();
+  });
+});

apps/web/src/components/mission-control/__tests__/PanelControls.test.tsx

@@ -0,0 +1,70 @@
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { PanelControls } from "../PanelControls";
+import * as apiClient from "@/lib/api/client";
+
+vi.mock("@/lib/api/client", () => ({
+  apiPost: vi.fn(),
+}));
+
+const mockApiPost = vi.mocked(apiClient.apiPost);
+
+function renderPanelControls(status: string): void {
+  const queryClient = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+
+  render(
+    <QueryClientProvider client={queryClient}>
+      <PanelControls sessionId="session-1" status={status} />
+    </QueryClientProvider>
+  );
+}
+
+describe("PanelControls (__tests__)", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", vi.fn());
+    mockApiPost.mockResolvedValue({ message: "ok" } as never);
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("Pause button disabled when status=paused", () => {
+    renderPanelControls("paused");
+
+    expect(screen.getByRole("button", { name: "Pause session" })).toBeDisabled();
+  });
+
+  it("Resume button disabled when status=active", () => {
+    renderPanelControls("active");
+
+    expect(screen.getByRole("button", { name: "Resume session" })).toBeDisabled();
+  });
+
+  it("Kill buttons disabled when status=killed", () => {
+    renderPanelControls("killed");
+
+    expect(screen.getByRole("button", { name: "Gracefully kill session" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Force kill session" })).toBeDisabled();
+  });
+
+  it("clicking pause calls the API", async () => {
+    const user = userEvent.setup();
+
+    renderPanelControls("active");
+
+    await user.click(screen.getByRole("button", { name: "Pause session" }));
+
+    await waitFor(() => {
+      expect(mockApiPost).toHaveBeenCalledWith("/api/mission-control/sessions/session-1/pause");
+    });
+  });
+});

apps/web/src/components/mission-control/__tests__/mission-control-phase2.gate.test.tsx

@@ -0,0 +1,34 @@
+import type { ReactNode } from "react";
+import { render, screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+import { MissionControlLayout } from "../MissionControlLayout";
+
+vi.mock("@/components/mission-control/AuditLogDrawer", () => ({
+  AuditLogDrawer: ({ trigger }: { trigger: ReactNode }): React.JSX.Element => (
+    <div data-testid="audit-log-drawer">{trigger}</div>
+  ),
+}));
+
+vi.mock("@/components/mission-control/GlobalAgentRoster", () => ({
+  GlobalAgentRoster: (): React.JSX.Element => <div data-testid="global-agent-roster" />,
+}));
+
+vi.mock("@/components/mission-control/MissionControlPanel", () => ({
+  MissionControlPanel: (): React.JSX.Element => <div data-testid="mission-control-panel" />,
+  MIN_PANEL_COUNT: 1,
+  MAX_PANEL_COUNT: 6,
+}));
+
+describe("Mission Control Phase 2 Gate", () => {
+  it("Phase 2 gate: MissionControlLayout renders with all components present", () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation((..._args) => undefined);
+
+    render(<MissionControlLayout />);
+
+    expect(screen.getByTestId("global-agent-roster")).toBeInTheDocument();
+    expect(screen.getByTestId("mission-control-panel")).toBeInTheDocument();
+    expect(consoleErrorSpy).not.toHaveBeenCalled();
+
+    consoleErrorSpy.mockRestore();
+  });
+});

apps/web/src/components/onboarding/OnboardingWizard.test.tsx

@@ -102,5 +102,5 @@ describe("OnboardingWizard", () => {
     await waitFor(() => {
       expect(mockPush).toHaveBeenCalledWith("/");
     });
-  });
+  }, 10_000);
 });

apps/web/src/components/ui/collapsible.tsx

@@ -0,0 +1,13 @@
+import * as React from "react";
+
+export interface CollapsibleProps extends React.HTMLAttributes<HTMLDivElement> {
+  open?: boolean;
+}
+
+export function Collapsible({
+  open = true,
+  className = "",
+  ...props
+}: CollapsibleProps): React.JSX.Element {
+  return <div data-state={open ? "open" : "closed"} className={className} {...props} />;
+}

apps/web/src/components/ui/scroll-area.tsx

@@ -0,0 +1,15 @@
+import * as React from "react";
+
+export type ScrollAreaProps = React.HTMLAttributes<HTMLDivElement>;
+
+export const ScrollArea = React.forwardRef<HTMLDivElement, ScrollAreaProps>(
+  ({ className = "", children, ...props }, ref) => {
+    return (
+      <div ref={ref} className={`relative overflow-hidden ${className}`} {...props}>
+        <div className="h-full w-full overflow-auto">{children}</div>
+      </div>
+    );
+  }
+);
+
+ScrollArea.displayName = "ScrollArea";

apps/web/src/components/ui/sheet.tsx

@@ -0,0 +1,137 @@
+import * as React from "react";
+import { X } from "lucide-react";
+
+export interface SheetProps {
+  open?: boolean;
+  onOpenChange?: (open: boolean) => void;
+  children?: React.ReactNode;
+}
+
+export interface SheetTriggerProps {
+  children?: React.ReactNode;
+  asChild?: boolean;
+}
+
+export interface SheetContentProps {
+  children?: React.ReactNode;
+  className?: string;
+}
+
+export interface SheetHeaderProps {
+  children?: React.ReactNode;
+  className?: string;
+}
+
+export interface SheetTitleProps {
+  children?: React.ReactNode;
+  className?: string;
+}
+
+export interface SheetDescriptionProps {
+  children?: React.ReactNode;
+  className?: string;
+}
+
+const SheetContext = React.createContext<{
+  open?: boolean;
+  onOpenChange?: (open: boolean) => void;
+}>({});
+
+export function Sheet({ open, onOpenChange, children }: SheetProps): React.JSX.Element {
+  const contextValue: { open?: boolean; onOpenChange?: (open: boolean) => void } = {};
+
+  if (open !== undefined) {
+    contextValue.open = open;
+  }
+
+  if (onOpenChange !== undefined) {
+    contextValue.onOpenChange = onOpenChange;
+  }
+
+  return <SheetContext.Provider value={contextValue}>{children}</SheetContext.Provider>;
+}
+
+export function SheetTrigger({ children, asChild }: SheetTriggerProps): React.JSX.Element {
+  const { onOpenChange } = React.useContext(SheetContext);
+
+  if (asChild && React.isValidElement(children)) {
+    return React.cloneElement(children, {
+      onClick: () => onOpenChange?.(true),
+    } as React.HTMLAttributes<HTMLElement>);
+  }
+
+  return (
+    <button type="button" onClick={() => onOpenChange?.(true)}>
+      {children}
+    </button>
+  );
+}
+
+export function SheetContent({
+  children,
+  className = "",
+}: SheetContentProps): React.JSX.Element | null {
+  const { open, onOpenChange } = React.useContext(SheetContext);
+
+  React.useEffect(() => {
+    if (!open) {
+      return;
+    }
+
+    const onKeyDown = (event: KeyboardEvent): void => {
+      if (event.key === "Escape") {
+        onOpenChange?.(false);
+      }
+    };
+
+    window.addEventListener("keydown", onKeyDown);
+    return (): void => {
+      window.removeEventListener("keydown", onKeyDown);
+    };
+  }, [onOpenChange, open]);
+
+  if (!open) {
+    return null;
+  }
+
+  return (
+    <div className="fixed inset-0 z-50">
+      <button
+        type="button"
+        aria-label="Close sheet"
+        className="absolute inset-0 h-full w-full bg-black/50"
+        onClick={() => onOpenChange?.(false)}
+      />
+
+      <div
+        className={`absolute inset-y-0 right-0 z-10 flex h-full w-full max-w-3xl flex-col border-l border-border bg-background p-6 shadow-xl ${className}`}
+      >
+        <button
+          type="button"
+          onClick={() => onOpenChange?.(false)}
+          className="absolute right-4 top-4 rounded-sm opacity-70 transition-opacity hover:opacity-100"
+        >
+          <X className="h-4 w-4" />
+          <span className="sr-only">Close</span>
+        </button>
+
+        {children}
+      </div>
+    </div>
+  );
+}
+
+export function SheetHeader({ children, className = "" }: SheetHeaderProps): React.JSX.Element {
+  return <div className={`space-y-1 pr-8 ${className}`}>{children}</div>;
+}
+
+export function SheetTitle({ children, className = "" }: SheetTitleProps): React.JSX.Element {
+  return <h2 className={`text-lg font-semibold ${className}`}>{children}</h2>;
+}
+
+export function SheetDescription({
+  children,
+  className = "",
+}: SheetDescriptionProps): React.JSX.Element {
+  return <p className={`text-sm text-muted-foreground ${className}`}>{children}</p>;
+}

apps/web/src/components/ui/skeleton.tsx

@@ -0,0 +1,15 @@
+import * as React from "react";
+
+export type SkeletonProps = React.HTMLAttributes<HTMLDivElement>;
+
+export const Skeleton = React.forwardRef<HTMLDivElement, SkeletonProps>(
+  ({ className = "", ...props }, ref) => (
+    <div
+      ref={ref}
+      className={`animate-pulse rounded-md bg-[rgb(var(--surface-2))] ${className}`}
+      {...props}
+    />
+  )
+);
+
+Skeleton.displayName = "Skeleton";

apps/web/src/hooks/useMissionControl.ts

@@ -0,0 +1,189 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+import { useQuery } from "@tanstack/react-query";
+import type { AgentMessageRole, AgentSessionStatus } from "@mosaic/shared";
+import { apiGet } from "@/lib/api/client";
+
+const MISSION_CONTROL_SESSIONS_QUERY_KEY = ["mission-control", "sessions"] as const;
+const SESSIONS_REFRESH_INTERVAL_MS = 15_000;
+
+export type MissionControlMessageRole = AgentMessageRole;
+
+export interface MissionControlSession {
+  id: string;
+  providerId: string;
+  providerType: string;
+  label?: string;
+  status: AgentSessionStatus;
+  parentSessionId?: string;
+  createdAt: string;
+  updatedAt: string;
+  metadata?: Record<string, unknown>;
+}
+
+interface MissionControlSessionsResponse {
+  sessions: MissionControlSession[];
+}
+
+export interface MissionControlStreamMessage {
+  id: string;
+  sessionId: string;
+  role: MissionControlMessageRole;
+  content: string;
+  timestamp: string;
+  metadata?: Record<string, unknown>;
+}
+
+export type MissionControlConnectionStatus = "connecting" | "connected" | "error";
+
+export interface UseSessionsResult {
+  sessions: MissionControlSession[];
+  loading: boolean;
+  error: Error | null;
+}
+
+export interface UseSessionStreamResult {
+  messages: MissionControlStreamMessage[];
+  status: MissionControlConnectionStatus;
+  error: string | null;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
+function isMessageRole(value: unknown): value is MissionControlMessageRole {
+  return value === "assistant" || value === "system" || value === "tool" || value === "user";
+}
+
+function isMissionControlStreamMessage(value: unknown): value is MissionControlStreamMessage {
+  if (!isRecord(value)) {
+    return false;
+  }
+
+  const { id, sessionId, role, content, timestamp, metadata } = value;
+
+  if (
+    typeof id !== "string" ||
+    typeof sessionId !== "string" ||
+    !isMessageRole(role) ||
+    typeof content !== "string" ||
+    typeof timestamp !== "string"
+  ) {
+    return false;
+  }
+
+  if (metadata !== undefined && !isRecord(metadata)) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Fetches Mission Control sessions.
+ */
+export function useSessions(): UseSessionsResult {
+  const query = useQuery<MissionControlSessionsResponse>({
+    queryKey: MISSION_CONTROL_SESSIONS_QUERY_KEY,
+    queryFn: async (): Promise<MissionControlSessionsResponse> => {
+      return apiGet<MissionControlSessionsResponse>("/api/mission-control/sessions");
+    },
+    refetchInterval: SESSIONS_REFRESH_INTERVAL_MS,
+  });
+
+  return {
+    sessions: query.data?.sessions ?? [],
+    loading: query.isLoading,
+    error: query.error ?? null,
+  };
+}
+
+/**
+ * Backward-compatible alias for early Mission Control integration.
+ */
+export function useMissionControl(): UseSessionsResult {
+  return useSessions();
+}
+
+/**
+ * Streams Mission Control session messages over SSE.
+ */
+export function useSessionStream(sessionId: string): UseSessionStreamResult {
+  const [messages, setMessages] = useState<MissionControlStreamMessage[]>([]);
+  const [status, setStatus] = useState<MissionControlConnectionStatus>("connecting");
+  const [error, setError] = useState<string | null>(null);
+
+  const eventSourceRef = useRef<EventSource | null>(null);
+
+  useEffect(() => {
+    if (eventSourceRef.current !== null) {
+      eventSourceRef.current.close();
+      eventSourceRef.current = null;
+    }
+
+    setMessages([]);
+    setError(null);
+
+    if (!sessionId) {
+      setStatus("connecting");
+      return;
+    }
+
+    if (typeof EventSource === "undefined") {
+      setStatus("error");
+      setError("Mission Control stream is not supported by this browser.");
+      return;
+    }
+
+    setStatus("connecting");
+
+    const source = new EventSource(
+      `/api/mission-control/sessions/${encodeURIComponent(sessionId)}/stream`
+    );
+    eventSourceRef.current = source;
+
+    source.onopen = (): void => {
+      setStatus("connected");
+      setError(null);
+    };
+
+    source.onmessage = (event: MessageEvent<string>): void => {
+      try {
+        const parsed = JSON.parse(event.data) as unknown;
+        if (!isMissionControlStreamMessage(parsed)) {
+          return;
+        }
+
+        setMessages((previousMessages) => [...previousMessages, parsed]);
+      } catch {
+        // Ignore malformed events from the stream.
+      }
+    };
+
+    source.onerror = (): void => {
+      if (source.readyState === EventSource.CONNECTING) {
+        setStatus("connecting");
+        setError(null);
+        return;
+      }
+
+      setStatus("error");
+      setError("Mission Control stream disconnected.");
+    };
+
+    return (): void => {
+      source.close();
+      if (eventSourceRef.current === source) {
+        eventSourceRef.current = null;
+      }
+    };
+  }, [sessionId]);
+
+  return {
+    messages,
+    status,
+    error,
+  };
+}

docs/TASKS.md

@@ -124,9 +124,9 @@ Target version: `v0.0.23`
 | MS23-P0-001 | done        | p0-foundation | Prisma schema: AgentConversationMessage, AgentSessionTree, AgentProviderConfig, OperatorAuditLog | #693  | api          | feat/ms23-p0-schema    | —                                               | MS23-P0-002,MS23-P0-003,MS23-P0-004,MS23-P0-005,MS23-P1-001 | codex | 2026-03-06 | 2026-03-06   | 15K      | —    | taskSource field per mosaic-queue note in PRD |
 | MS23-P0-002 | done        | p0-foundation | Agent message ingestion: wire spawner/lifecycle to write messages to DB                          | #693  | orchestrator | feat/ms23-p0-ingestion | MS23-P0-001                                     | MS23-P0-006                                                 | codex | 2026-03-06 | 2026-03-07      | 20K      | —    |                                               |
 | MS23-P0-003 | done        | p0-foundation | Orchestrator API: GET /agents/:id/messages + SSE stream endpoint                                 | #693  | orchestrator | feat/ms23-p0-stream    | MS23-P0-001                                     | MS23-P0-006                                                 | codex | 2026-03-06 | 2026-03-07      | 20K      | —    |                                               |
-| MS23-P0-004 | in-progress | p0-foundation | Orchestrator API: POST /agents/:id/inject + pause/resume endpoints                               | #693  | orchestrator | feat/ms23-p0-controls  | MS23-P0-001                                     | MS23-P0-006                                                 | codex | 2026-03-07     | —            | 15K      | —    |                                               |
-| MS23-P0-005 | not-started | p0-foundation | Subagent tree: parentAgentId on spawn registration + GET /agents/tree                            | #693  | orchestrator | feat/ms23-p0-tree      | MS23-P0-001                                     | MS23-P0-006                                                 | —     | —          | —            | 15K      | —    |                                               |
-| MS23-P0-006 | not-started | p0-foundation | Unit + integration tests for all P0 orchestrator endpoints                                       | #693  | orchestrator | test/ms23-p0           | MS23-P0-002,MS23-P0-003,MS23-P0-004,MS23-P0-005 | MS23-P1-001                                                 | —     | —          | —            | 20K      | —    | Phase 0 gate: SSE stream verified via curl    |
+| MS23-P0-004 | done        | p0-foundation | Orchestrator API: POST /agents/:id/inject + pause/resume endpoints                               | #693  | orchestrator | feat/ms23-p0-controls  | MS23-P0-001                                     | MS23-P0-006                                                 | codex | 2026-03-07 | 2026-03-07 | 15K      | —    |                                               |
+| MS23-P0-005 | done        | p0-foundation | Subagent tree: parentAgentId on spawn registration + GET /agents/tree                            | #693  | orchestrator | feat/ms23-p0-tree      | MS23-P0-001                                     | MS23-P0-006                                                 | —     | —          | —            | 15K      | —    |                                               |
+| MS23-P0-006 | done        | p0-foundation | Unit + integration tests for all P0 orchestrator endpoints                                       | #693  | orchestrator | test/ms23-p0           | MS23-P0-002,MS23-P0-003,MS23-P0-004,MS23-P0-005 | MS23-P1-001                                                 | codex | 2026-03-07 | 2026-03-07 | 20K      | —    | Phase 0 gate: SSE stream verified via curl    |
 
 ### Phase 1 — Provider Interface (Plugin Architecture)
 

packages/shared/src/types/agent-provider.types.ts

@@ -0,0 +1,78 @@
+// Agent message roles
+export type AgentMessageRole = "user" | "assistant" | "system" | "tool";
+
+// A single message in an agent conversation
+export interface AgentMessage {
+  id: string;
+  sessionId: string;
+  role: AgentMessageRole;
+  content: string;
+  timestamp: Date;
+  metadata?: Record<string, unknown>;
+}
+
+// Session lifecycle status
+export type AgentSessionStatus = "active" | "paused" | "completed" | "failed" | "idle";
+
+// An agent session (conversation thread)
+export interface AgentSession {
+  id: string;
+  providerId: string; // which provider owns this session
+  providerType: string; // "internal" | "openclaw" | etc.
+  label?: string;
+  status: AgentSessionStatus;
+  parentSessionId?: string; // for subagent trees
+  createdAt: Date;
+  updatedAt: Date;
+  metadata?: Record<string, unknown>;
+}
+
+// Result of listing sessions
+export interface AgentSessionList {
+  sessions: AgentSession[];
+  total: number;
+  cursor?: string;
+}
+
+// Result of injecting a message
+export interface InjectResult {
+  accepted: boolean;
+  messageId?: string;
+}
+
+// The IAgentProvider interface — every provider (internal, OpenClaw, future) implements this
+export interface IAgentProvider {
+  readonly providerId: string;
+  readonly providerType: string;
+  readonly displayName: string;
+
+  // Session management
+  listSessions(cursor?: string, limit?: number): Promise<AgentSessionList>;
+  getSession(sessionId: string): Promise<AgentSession | null>;
+  getMessages(sessionId: string, limit?: number, before?: string): Promise<AgentMessage[]>;
+
+  // Control operations
+  injectMessage(sessionId: string, content: string): Promise<InjectResult>;
+  pauseSession(sessionId: string): Promise<void>;
+  resumeSession(sessionId: string): Promise<void>;
+  killSession(sessionId: string, force?: boolean): Promise<void>;
+
+  // SSE streaming — returns an AsyncIterable of AgentMessage events
+  streamMessages(sessionId: string): AsyncIterable<AgentMessage>;
+
+  // Health
+  isAvailable(): Promise<boolean>;
+}
+
+// Provider configuration stored in DB (AgentProviderConfig model from P0 schema)
+export interface AgentProviderConfig {
+  id: string;
+  providerId: string;
+  providerType: string;
+  displayName: string;
+  baseUrl?: string;
+  apiToken?: string;
+  enabled: boolean;
+  createdAt: Date;
+  updatedAt: Date;
+}

packages/shared/src/types/index.ts

@@ -134,3 +134,6 @@ export * from "./widget.types";
 
 // Export WebSocket types
 export * from "./websocket.types";
+
+// Export agent provider types
+export * from "./agent-provider.types";