feat(orchestrator): add agent provider registry

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

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

@@ -0,0 +1,137 @@
+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>;
+};
+
+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")
+    );
+  });
+});

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

@@ -0,0 +1,57 @@
+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 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/agents.module.ts

@@ -11,6 +11,7 @@ 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],
@@ -22,7 +23,8 @@ import { InternalAgentProvider } from "./internal-agent.provider";
     AgentControlService,
     AgentTreeService,
     InternalAgentProvider,
+    AgentProviderRegistry,
   ],
-  exports: [InternalAgentProvider],
+  exports: [InternalAgentProvider, AgentProviderRegistry],
 })
 export class AgentsModule {}