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feat: let agents start new sessions via spawn_session tool

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Add a project-scoped spawn_session tool so agents can dispatch new,
independent sessions (ralph loops, long-plan chaining). Spawned sessions
are constrained to a workspace/worktree of the same registered project,
appear in the session list immediately via a new session.created event,
and the capability is on by default with a Settings -> Session daemon
toggle (spawnSessions / PI_WEB_SPAWN_SESSIONS).

Note: adds a session daemon code path, so pi-web-sessiond.service must be
restarted manually for the server side to take effect.
This commit is contained in:
Federico Jaramillo Martinez
2026-06-16 14:53:37 +02:00
parent bfcd975c83
commit 95c151233a
26 changed files with 630 additions and 18 deletions
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src/server/sessiond.ts
+15 -2
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@@ -10,12 +10,16 @@ import { AuthService } from "./sessions/authService.js";
import { registerAuthRoutes } from "./sessions/authRoutes.js";
import { PiSessionService } from "./sessions/piSessionService.js";
import { registerSessionRoutes } from "./sessions/sessionRoutes.js";
import { ProjectScopedSpawnTargetResolver } from "./sessions/spawnTargetResolver.js";
import { ProjectService } from "./projects/projectService.js";
import { ProjectStore } from "./storage/projectStore.js";
import { WorkspaceService } from "./workspaces/workspaceService.js";
import { sessiondSocketPath } from "../sessiond/config.js";
import { TerminalService } from "./terminals/terminalService.js";
import { registerTerminalRoutes } from "./terminals/terminalRoutes.js";
import { getPiWebRuntimeComponent } from "./piWebStatus.js";
import { SESSIOND_RUNTIME_CAPABILITIES } from "../shared/capabilities.js";
import { maxUploadBytes } from "../config.js";
import { effectivePiWebConfig, maxUploadBytes, spawnSessionsEnabled } from "../config.js";
const app = Fastify({ logger: true, bodyLimit: maxUploadBytes() });
await app.register(fastifyWebsocket);
@@ -23,7 +27,16 @@ await app.register(fastifyWebsocket);
const eventHub = new SessionEventHub();
const workspaceActivity = new WorkspaceActivityService(eventHub);
const auth = new AuthService();
const sessions = new PiSessionService(eventHub, { modelRegistry: auth.modelRegistry, workspaceActivity });
const { config } = effectivePiWebConfig();
const spawnTargets = spawnSessionsEnabled(process.env, config)
? new ProjectScopedSpawnTargetResolver({ projects: new ProjectService(new ProjectStore()), workspaces: new WorkspaceService() })
: undefined;
const sessions = new PiSessionService(eventHub, {
modelRegistry: auth.modelRegistry,
workspaceActivity,
logger: app.log,
...(spawnTargets === undefined ? {} : { spawnTargets }),
});
auth.subscribe((change) => { sessions.applyAuthChange(change); });
const terminals = new TerminalService(eventHub, workspaceActivity);
registerWorkspaceActivityRoutes(app, workspaceActivity);