nicobailon/pi-coordination

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# pi-coordination Multi-agent coordination for [pi](https://github.com/badlogic/pi-mono). Parallel task execution with dependencies, contracts, review cycles, and real-time visibility. > **Ralph Wiggum on steroids** — the same single-task-per-agent pattern, scaled with parallelism and coordination. If Ralph is a solo developer with a todo list, pi-coordination is a team with a project manager, code reviewer, and task board. ## Philosophy Agents work better focused on ONE task with fresh context, rather than juggling an entire spec at once. A **plan** here isn't a sequential checklist — it's a **task graph**. Independent tasks run in parallel; dependent tasks wait for prerequisites. Workers continuously spawn as tasks become available, and new tasks can be discovered mid-run. **Core pattern** (shared with Ralph Wiggum): - **Stateless agents** — Fresh context each time, no accumulated confusion - **Stateful files** — `tasks.json` tracks progress, survives crashes - **One task per agent** — Focused execution, no context overload **What we add:** - **Parallel execution** — N workers instead of 1 - **Task graph** — Dependencies, not sequence - **Contracts** — Cross-worker coordination for shared types/APIs - **File reservations** — Prevent conflicts on shared files - **Review cycles** — Dedicated quality gate after workers complete - **Real-time monitoring** — TUI dashboard for visibility ## Two-Track Architecture The coordination system is split into two focused tools: ``` ┌─────────────────────────────────────────────────────────────┐ │ plan tool │ │ Input: Prose, idea, PRD Output: Spec file │ │ │ │ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │ │ │Interview │→ │ Scout │→ │Elaborate │→ │Structure │ │ │ │ 60s/Q │ │ targeted │ │ NO tools │ │ TASK-XX │ │ │ └──────────┘ └──────────┘ └──────────┘ └──────────┘ │ └─────────────────────────────────────────────────────────────┘ ↓ spec.md ↓ ┌─────────────────────────────────────────────────────────────┐ │ coordinate tool │ │ Input: TASK-XX Spec Output: Completed work │ │ │ │ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │ │ │ Validate │→ │Dispatch │→ │ Execute │→ │ Review │ │ │ │ (strict) │ │(priority)│ │(workers) │ │(verify) │ │ │ └──────────┘ └──────────┘ └──────────┘ └──────────┘ │ └─────────────────────────────────────────────────────────────┘ ``` - **`plan` tool**: Converts ideas/PRDs into structured TASK-XX specs via interview + scout + LLM elaboration - **`coordinate` tool**: Executes TASK-XX specs with parallel workers, strict validation, and review cycles ## Features - **Two-Track Architecture**: Separate planning (interactive) from execution (automated) - **Interactive Interview**: Multi-round questions with 60s timeout, sensible defaults - **Targeted Scout**: Codebase analysis guided by interview findings - **Task Queue Model**: Priority-based (P0-P3) task distribution with dependencies - **Subtask Support**: Workers can break down complex tasks into TASK-XX.Y subtasks - **Parallel Execution**: Spawn multiple workers to execute tasks simultaneously - **Worker Context Persistence**: Tool events tracked across restarts for smart recovery - **Smart Auto-Continue**: Failed workers restart with context from previous attempt - **Supervisor Loop**: Monitors workers for inactivity, sends nudges, restarts stuck workers - **Discovered Tasks**: Workers can add new tasks during implementation for planner review - **A2A Messaging**: Agent-to-agent communication with read tracking and expiration - **Dependency Graph**: Formal dependency types (blocks, parent, waits-for, discovered) - **Review Cycles**: Automated code review with fix iterations - **Cost Controls**: Configurable cost limit with graceful shutdown - **Async Mode**: Fire-and-forget coordination with completion notifications - **Full Observability**: Events, spans, decisions, causality tracking, snapshots - **Coordination Dashboard**: Full-screen `/jobs` command for monitoring - **Validation Layer**: Invariant checking, content validation, streaming warnings ## Installation ```bash ./install.sh ``` This creates symlinks at `~/.pi/agent/extensions/coordination` and `~/.pi/agent/agents/coordination/` so changes here are reflected immediately. To uninstall: ```bash ./install.sh --uninstall ``` ## Requirements - pi (from pi-mono) v0.35.0+ (extensions system) - Node.js 18+ ## Settings Default options can be configured in `~/.pi/agent/settings.json` under the `coordination` key: ```json { "coordination": { "agents": 4, "reviewCycles": 5, "supervisor": true, "costLimit": 40 } } ``` **Plan tool settings:** ```json { "coordination": { "plan": { "maxInterviewRounds": 5, "tokenBudget": 100000, "contextRatio": 0.85 } } } ``` Use `false` to disable features: ```json { "coordination": { "reviewCycles": false, "supervisor": { "nudgeThresholdMs": 120000 } } } ``` **Runtime configuration** (per-coordination session) can be set in `runtime-config.json` in the coordination directory: ```json { "useSDKWorkers": true, "models": { "worker": "claude-sonnet-4-20250514" } } ``` Or via environment variable: `PI_USE_SDK_WORKERS=1` Options passed to `coordinate()` override settings, which override built-in defaults. ## Usage ### Two-Step Workflow **Step 1: Create a spec with `plan`** ```typescript plan({ input: "Add user authentication with JWT" }) ``` This runs an interactive interview, scouts the codebase, and produces a TASK-XX spec file. **Step 2: Execute with `coordinate`** ```typescript coordinate({ plan: "./specs/auth-spec.md" }) ``` This validates the spec and executes tasks with parallel workers. ### Plan Tool ```typescript // From an idea plan({ input: "Add user authentication with JWT" }) // From an existing PRD file plan({ input: "./requirements/auth.md" }) // Refine an existing spec plan({ continue: "./specs/auth-spec.md" }) // Skip interview, go straight to scout plan({ input: "./requirements/auth.md", skipInterview: true }) // Custom output location plan({ input: "Add auth", output: "./specs/auth-spec.md" }) ``` **Plan tool phases:** 1. **Interview** — Multi-round questions (60s timeout per question) 2. **Scout** — Targeted codebase analysis based on interview findings 3. **Elaborate** — Frontier model creates detailed plan (~100K token context) 4. **Structure** — Convert to TASK-XX format with validation 5. **Handoff** — Show summary, offer execute/refine/exit ### Coordinate Tool ```typescript // Basic execution (requires valid TASK-XX spec) coordinate({ plan: "./spec.md" }) // 8 workers coordinate({ plan: "./spec.md", agents: 8 }) // Custom review cycles coordinate({ plan: "./spec.md", reviewCycles: 3 }) // Disable self-review coordinate({ plan: "./spec.md", reviewCycles: false }) // With all options coordinate({ plan: "./spec.md", agents: 4, // or ["worker", "worker", ...] logPath: "./logs", resume: "workers-1234567", maxFixCycles: 3, sameIssueLimit: 2, checkTests: true, async: false, maxOutput: { lines: 200 }, costLimit: 40, // End gracefully when cost exceeds limit validate: true, reviewCycles: 5, // worker self-review cycles (false to disable) supervisor: true, // or { nudgeThresholdMs: 180000, ... } coordinator: "claude-opus-4-5", worker: "claude-sonnet-4-5", reviewer: "claude-opus-4-5" }) ``` **Note:** The `coordinate` tool requires a valid TASK-XX format spec. If your input isn't a valid spec, you'll get an error suggesting to use the `plan` tool first. **Model Resolution Order**: For each phase, models are resolved in this priority: 1. Per-call parameter (e.g., `worker: "model-name"`) 2. Agent frontmatter `model:` field in `~/.pi/agent/agents/coordination/*.md` 3. Pi's global `defaultModel` from `~/.pi/agent/settings.json` To disable logging, set `logPath: ""` or use `PI_COORDINATION_LOG_DIR` env var. ### Example Flow > "Add authentication to the API" ``` 1. plan({ input: "Add authentication to the API" }) ├── Interview: "What auth method? OAuth, JWT, session?" ├── Scout: Finds existing routes, middleware patterns ├── Elaborate: Creates detailed implementation plan └── Structure: Outputs auth-spec.md with TASK-01 through TASK-05 2. coordinate({ plan: "./auth-spec.md" }) ├── Validate: Checks TASK-XX format, dependencies ├── Dispatch: Assigns TASK-01 (types) first (no deps) ├── Workers: Execute tasks in parallel ├── Review: Code reviewer checks changes └── Complete: All tasks done, summary generated ``` ## Pipeline Phases ### Plan Tool Phases | Phase | Description | |-------|-------------| | **interview** | Multi-round questions (60s timeout each), gathers requirements | | **scout** | Targeted codebase analysis based on interview findings | | **elaborate** | Frontier model creates detailed plan (~100K context, no tools) | | **structure** | Convert to TASK-XX format with validation | | **handoff** | Show summary, offer execute/refine/exit (60s timeout) | ### Coordinate Tool Phases | Phase | Description | |-------|-------------| | **validate** | Strict TASK-XX format validation | | **coordinator** | Spawns workers from task queue, manages supervisor loop | | **workers** | Parallel execution of tasks with self-review | | **integration** | Cross-component review (API contracts, shared types, data flow) | | **review** | Code reviewer checks all changes against plan goals | | **fixes** | Same workers fix issues found in review | | **complete** | All done, generate final report | ## Coordinator Tools | Tool | Description | |------|-------------| | `spawn_workers` | Spawn workers with specs, wait for completion | | `spawn_from_queue` | Spawn workers based on pending tasks from task queue | | `get_task_queue_status` | Get status of all tasks in the queue | | `assign_files` | Pre-assign files to workers before spawning | | `create_contract` | Define dependencies between workers | | `broadcast_deviation` | Notify workers when plan changes | | `check_status` | Get status of all workers and contracts | | `broadcast` | Send message to all workers | | `escalate_to_user` | Ask user a question with timeout | | `update_progress` | Update PROGRESS.md in coordination directory | | `done` | Signal coordination complete | ## Worker Tools ### Unified API (v2) | Tool | Description | |------|-------------| | `agent_chat` | All communication - messages, broadcasts, escalations, inbox | | `agent_sync` | Contract synchronization - provide/need interfaces | | `agent_work` | Task lifecycle - complete, step, add task, deviation, plan | | `file_reservations` | File management - acquire, release, check reservations | **agent_chat actions:** - `agent_chat({ to: "worker:...", content: "..." })` - Send message - `agent_chat({ to: "all", topic: "...", content: "...", importance: "critical" })` - Broadcast discovery - `agent_chat({ to: "user", question: "...", options: [...] })` - Escalate to user - `agent_chat({ action: "inbox" })` - Check messages **agent_sync actions:** - `agent_sync({ action: "provide", item: "...", signature: "..." })` - Signal interface ready - `agent_sync({ action: "need", item: "..." })` - Wait for interface **agent_work actions:** - `agent_work({ action: "complete", result: "..." })` - Mark task done - `agent_work({ action: "step", step: N })` - Update progress - `agent_work({ action: "add", description: "...", reason: "..." })` - Add discovered task - `agent_work({ action: "deviation", description: "..." })` - Report deviation - `agent_work({ action: "plan" })` - Read full plan **file_reservations actions:** - `file_reservations({ action: "acquire", patterns: [...], ttl: 300 })` - Reserve files - `file_reservations({ action: "release", patterns: [...] })` - Release files - `file_reservations({ action: "check", path: "..." })` - Check who has file ## Planner Tools | Tool | Description | |------|-------------| | `read_context` | Read scout context file without truncation (supports section filtering) | ## Scout Context Format The targeted scout produces two outputs for the elaborate phase: 1. **contextDoc** (~85K tokens) — Raw file contents with structure 2. **metaPrompt** (~15K tokens) — Synthesized guidance combining interview + codebase analysis ### Context Document Format ````markdown <file_map> /path/to/project ├── src │ ├── types.ts * + (* = needs modification, + = contents included) │ ├── store.ts * + │ ├── routes/ │ │ ├── index.ts * + │ │ └── users.ts + (reference only) │ └── middleware/ │ └── auth.ts + (pattern example) ├── tests/ │ └── users.test.ts * + └── package.json + </file_map> <file_contents> File: src/types.ts (full file - 45 lines) ```typescript export interface User { id: string; email: string; // ... } ``` File: src/routes/index.ts:1-30,85-120 (relevant sections) ```typescript // Lines 1-30: Route setup import { Router } from 'express'; // ... ``` </file_contents> ```` ### Meta Prompt Format ````markdown # Planning Guidance ## Request Summary User wants to add JWT authentication to the Express API. From interview: prefer httpOnly cookies, need refresh tokens. ## Architecture Analysis ### Current State - Express 4.x with TypeScript - Routes in src/routes/, middleware in src/middleware/ - Existing User type needs extension ### Integration Points | What | Where | Action | |------|-------|--------| | Auth types | src/types.ts | Add AuthToken, Session interfaces | | Auth middleware | src/middleware/auth.ts | Create new file | ### Patterns to Follow - Middleware pattern: See existing `src/middleware/logging.ts` - Route pattern: See `src/routes/users.ts` ### Dependency Order 1. Types (no deps) → TASK-01 2. JWT utils (needs types) → TASK-02, depends on TASK-01 3. Middleware → TASK-03, depends on TASK-02 ### Gotchas & Warnings - ⚠️ Don't modify existing User queries until auth is wired - ⚠️ The existing `src/legacy/auth.js` is deprecated ```` **Token budget**: Scout targets ~100K total. The elaborate phase receives both directly in its prompt — no subsequent tool reads needed. ## TUI Display **Pipeline Timeline:** ``` Pipeline: [scout] -> [planner] -> [coordinator] -> [workers] -> [integration] -> [review] -> [fixes] -> [complete] Current: workers Cost: $0.45 / $40.00 limit ``` **While Running:** ``` ok 2/4 workers worker:04ea src/types.ts working 12s worker:52e2 src/store.ts working 10s --- +0.0s [co] Spawned 4 workers +1.2s [04ea] write src/types.ts +1.3s [52e2] Creating store... ``` **When Complete:** ``` Coordination Complete (2m 34s total, $0.89) | Worker | Time | Cost | Turns | Files Modified |-------------|--------|-------|-------|--------------- | ok worker:04ea | 45s | $0.22 | 8 | types.ts | ok worker:52e2 | 52s | $0.25 | 10 | store.ts ``` ## Coordination Dashboard For async coordination jobs, use the `/jobs` command to open a full-screen dashboard: ``` ─ Coordination ────────────────────────────────────────────────────────── Pipeline: [scout ✓] → [planner ✓] → [workers ●] → [integration] → [review] → [complete] Cost: $1.23 / $40.00 limit Elapsed: 3m 45s ─ Task Queue (6) ──────────────────────────────────────────────────────── ● task-1 Create user types claimed swift_fox ○ task-2 Implement auth service pending deps: task-1 ✓ task-3 Setup database schema complete calm_owl ─ Workers (4) ─────────────────────────────────────────────────────────── → swift_fox types.ts ● working 1m23s $0.45 45% calm_owl store.ts ✓ complete 2m01s $0.38 bold_hawk handlers.ts ● working 0m45s $0.22 32% keen_deer ---- ○ waiting 0m12s $0.00 ─ File Reservations ───────────────────────────────────────────────────── swift_fox → types.ts, user.ts bold_hawk → handlers.ts, routes.ts ─ Events ──────────────────────────────────────────────────────────────── +1m23s [swift] write src/types.ts +1m45s [calm] completed +2m01s [bold] read src/handlers.ts ─ Cost Breakdown ──────────────────────────────────────────────────────── By Phase: scout $0.12 | planner $0.34 | workers $0.77 [j/k] select [Enter] details [w]rap up [R]estart [A]bort [t]asks [q]uit ``` Workers get memorable Docker-style names (e.g., `swift_fox`, `calm_owl`) for easy identification across the dashboard, events, and file reservations. **Overlays:** - **Worker Details** (Enter): Stats, files modified, recent tools, output - **Task Queue** (t): Full task list with dependency visualization **Keyboard Controls:** | Key | Action | |-----|--------| | `j/k` or `↑/↓` | Navigate worker list | | `Enter` | Open worker details overlay | | `t` | Open full task queue overlay | | `w` | Send wrap_up nudge to selected worker | | `R` | Restart selected worker | | `A` | Abort selected worker | | `r` | Force refresh | | `q` or `Esc` | Exit dashboard (shows mini footer) | | `Q` | Exit without footer | **Mini Footer:** After exiting with `q`, a compact status line shows in the main UI: ``` [coord] workers ● 2/4 | $1.23 | 3m45s | /jobs to open ``` ## Spec Format (TASK-XX) The `coordinate` tool requires specs in TASK-XX format: ```markdown # Authentication Implementation ## TASK-01: Create auth types Priority: P1 Create `src/auth/types.ts` with User, Session, and Token interfaces. **Files:** src/auth/types.ts (create) **Depends on:** none **Acceptance:** Exports User, Session, Token interfaces ## TASK-02: Implement JWT utilities Priority: P1 Create JWT signing and verification utilities. **Files:** src/auth/jwt.ts (create) **Depends on:** TASK-01 **Acceptance:** signToken() and verifyToken() functions work ## TASK-03: Create auth middleware Priority: P2 Create Express middleware for route protection. **Files:** src/middleware/auth.ts (create) **Depends on:** TASK-02 **Acceptance:** Middleware extracts and validates JWT from cookies ``` **Required elements:** - Task ID: `TASK-XX` or `TASK-XX.Y` (for subtasks) - Priority: `P0` (critical) to `P3` (low) - Files: List of files to create/modify - Depends on: Task IDs or "none" - Acceptance: Testable criteria **Validation rules:** - At least one task with no dependencies (entry point) - No circular dependencies - All dependency references must exist - Valid task ID format Use `plan({ input: "..." })` to generate valid specs from prose. ## Coordination Log After each session, a markdown log is saved containing: - **Executive Summary**: One-line outcome with duration, worker count, cost - **Phase Timeline**: Table showing each phase's status, duration, and cost - **Plan**: The original plan content - **Workers Summary**: Table with status, duration, cost, files modified - **Contracts**: Dependency contracts between workers - **Event Timeline**: Chronological list of all events - **Worker Details**: Per-worker breakdown with handshake specs - **Review Cycles**: Issues found and fix attempts (if review ran) - **Cost Breakdown**: By phase and by worker - **Deviations**: Any deviations from the original plan - **Metadata**: Token counts, coordination directory path ## Architecture ``` ┌─────────────────────────────────────────────────────────────────────┐ │ plan tool │ │ │ │ "Add auth" ──► Interview ──► Scout ──► Elaborate ──► Spec │ │ (60s/Q) (targeted) (no tools) (TASK-XX)│ └───────────────────────────────────┬─────────────────────────────────┘ │ spec.md │ ▼ ┌─────────────────────────────────────────────────────────────────────┐ │ coordinate tool │ │ │ │ ├── [Validate] - Strict TASK-XX format check │ │ │ │ │ ├── [Coordinator Phase] │ │ │ ├── Spawns workers from task queue (priority-aware) │ │ │ ├── Starts supervisor loop │ │ │ └── Handles worker exits with smart auto-continue │ │ │ │ │ ├── [Workers Phase] - Execute in parallel │ │ │ ├── Claim tasks from queue │ │ │ ├── Context persisted to workers/<task-id>/context.md │ │ │ ├── Self-review before completion │ │ │ ├── Can request subtasks (TASK-XX.Y) │ │ │ └── Signal contracts when ready │ │ │ │ │ ├── [Integration Phase] - Cross-component review │ │ │ └── API contracts, shared types, data flow issues │ │ │ │ │ ├── [Review Phase] - Code reviewer checks changes │ │ │ └── Returns issues with file, line, severity │ │ │ │ │ └── [Fix Phase] - Workers fix their issues │ │ └── Repeat review/fix until clean or stuck │ └─────────────────────────────────────────────────────────────────────┘ ``` ## Task Queue Tasks are managed in a priority queue with dependencies: ```typescript interface Task { id: string; description: string; priority: number; // 0=P0 (critical), 1=P1, 2=P2, 3=P3 (low) status: TaskStatus; // pending_review, pending, blocked, claimed, complete, failed, rejected files?: string[]; dependsOn?: string[]; parentTaskId?: string; // For subtasks (TASK-XX.Y) blockedBy?: string[]; // Task IDs blocking this (e.g., subtasks) claimedBy?: string; discoveredFrom?: string; // For discovered tasks } ``` Task status flow: - **Planner tasks**: pending -> claimed -> complete/failed - **Discovered tasks**: pending_review -> pending -> claimed -> complete/failed (or rejected) - **Reviewer tasks**: pending (FIX-XX) -> claimed -> complete/failed - **Subtasks**: pending -> claimed -> complete (parent unblocks when all complete) ## Subtasks Workers can break down complex tasks into subtasks (TASK-XX.Y format): ```typescript // Worker requests subtasks agent_work({ action: "subtasks", subtasks: [ { title: "Create migration", description: "...", files: ["migrations/001.sql"] }, { title: "Update queries", description: "...", files: ["src/db/users.ts"] }, ] }) ``` **Subtask behavior:** - Max 5 subtasks per parent - All subtasks run in parallel (no inter-subtask dependencies) - Parent task blocked until all subtasks complete - Parent resumes after subtasks to finish up - Nested subtasks not allowed by default ## Dynamic Task Pickup Workers are spawned continuously as new tasks become available, not just at the start: 1. **Initial spawn**: Up to `maxWorkers` workers claim tasks from the queue 2. **On worker exit**: Immediately try to spawn a replacement for the next pending task 3. **Continuous polling**: Main loop checks for new tasks every 500ms 4. **Deadlock protection**: Exit after `dynamicSpawnTimeoutMs` (default: 30s) with no workers and no spawnable tasks This enables: - **Discovered tasks**: Workers can call `agent_work({ action: "add" })` to add tasks (creates DISC-XX, needs planner review) - **Reviewer tasks**: Code reviewer can include `newTasks` in JSON output (creates FIX-XX, auto-approved) - **Seamless continuation**: New tasks picked up without restarting coordination Task ID prefixes: - `TASK-XX`: Created by planner during initial planning - `DISC-XX`: Discovered by workers during implementation - `FIX-XX`: Created by code reviewer for issues found ## Worker Self-Review Workers run a self-review pass before `agent_work({ action: "complete" })` succeeds. The worker is prompted to review their changes with "fresh eyes" and fix any issues found. Only proceeds when "No issues found." is in the response. Configuration: - `PI_SELF_REVIEW_ENABLED`: Set to "false" to disable (default: "true") - `PI_MAX_SELF_REVIEW_CYCLES`: Max review cycles (default: 5) - `PI_SELF_REVIEW_SPEC_PATH`: Optional spec path to include in review prompt ## Worker Context & Recovery Each task maintains a persistent context file that survives worker restarts: ``` workers/TASK-03/ ├── context.md # Persistent context (auto-updated) ├── attempt-001.json # First attempt state └── attempt-002.json # Second attempt state ``` **Context tracking:** - Files modified (complete/partial/failed status) - Discoveries made during work - Attempt history (workers, exit codes, reasons) - Last actions before failure - Continuation notes for smart restarts **Smart auto-continue:** When a worker fails, the system automatically: 1. Loads `context.md` from previous attempt 2. Analyzes what was done and what failed 3. Builds a continuation prompt with context 4. Spawns new worker with: "Don't redo X, fix Y at line Z" This happens at the spawn level without coordinator involvement, making simple recovery fast and efficient. ## Supervisor The supervisor monitors worker activity and intervenes when workers appear stuck: - **Nudge**: Sends wrap_up message after `nudgeThresholdMs` (default: 3 min) - **Restart**: Kills worker, releases task after `restartThresholdMs` (default: 5 min) - **Abandon**: Marks task failed after `maxRestarts` attempts (default: 2) - **Stale Cleanup**: Releases orphaned claimed tasks after `staleTaskTimeoutMs` (default: 30 min) Configure via `supervisor: { nudgeThresholdMs, restartThresholdMs, maxRestarts, checkIntervalMs, dynamicSpawnTimeoutMs, staleTaskTimeoutMs }`. | Option | Default | Description | |--------|---------|-------------| | `nudgeThresholdMs` | 180000 | Send wrap_up after this inactivity | | `restartThresholdMs` | 300000 | Force restart after this inactivity | | `maxRestarts` | 2 | Max restart attempts before abandon | | `checkIntervalMs` | 30000 | How often to check workers | | `dynamicSpawnTimeoutMs` | 30000 | Exit spawning loop after this with no progress | | `staleTaskTimeoutMs` | 1800000 | Release claimed tasks with no worker after this | ## SDK Worker Mode By default, workers run as subprocesses (separate `pi` processes). SDK worker mode runs workers in-process using the Pi SDK's `createAgentSession()` API. **Enable SDK workers:** ```json // runtime-config.json in coordination directory { "useSDKWorkers": true } ``` Or via environment: `PI_USE_SDK_WORKERS=1` **Benefits:** - **Worker steering** — Send messages to running workers via dashboard `[i]` control - **Direct abort** — Terminate workers immediately via dashboard `[x]` control - **No subprocess overhead** — Workers share the coordinator's process **Dashboard controls for SDK workers:** | Key | Action | Description | |-----|--------|-------------| | `[i]` | Steer | Send a message to the worker (opens input) | | `[x]` | Abort | Terminate the worker session immediately | | `[w]` | Wrap up | Send wrap_up nudge (same as subprocess) | **Note:** `[R]estart` and `[A]bort` are disabled for SDK workers because they use `process.exit()` which would crash the entire coordinator process. Use `[x]` abort instead. **Subprocess workers** (default) still support `[w]rap up`, `[R]estart`, and `[A]bort` via the nudge system. ## Observability The coordination system includes comprehensive observability for debugging, replay, and analysis: ### Data Captured | Layer | File | Description | |-------|------|-------------| | Events | `events.jsonl` | Enhanced events with trace/span correlation | | Spans | `traces/spans.jsonl` | Hierarchical timing (phase, worker, tool) | | Causality | `causality.jsonl` | Cause-effect relationships between events | | Errors | `errors.jsonl` | Structured errors with category/severity | | Resources | `resources.jsonl` | Process/reservation lifecycle tracking | | Snapshots | `snapshots/*.json` | Git/file/coordination state at phase boundaries | | Decisions | `decisions.jsonl` | Decision audit trail with outcomes | ### Event Types (events.jsonl) - **Worker**: `worker_started`, `worker_completed`, `worker_failed` - **Tools**: `tool_call`, `tool_result` - **Contracts**: `waiting`, `contract_received` - **Coordinator**: `coordinator` (nudges, restarts, status messages) - **Pipeline**: `phase_complete` - **Cost**: `cost_milestone`, `cost_limit_reached` ### A2A Message Types (a2a-messages/) `file_release_request`, `file_release_response`, `discovery`, `task_handoff`, `help_request`, `status_update`, `completion_notice` ### Trace Correlation All events and spans share a `traceId` for session-wide correlation. Workers receive the trace ID via `PI_TRACE_ID` environment variable, enabling cross-process tracing. ## Validation The validation layer provides production-grade testing of coordination sessions by checking invariants and generating reports. ### Usage **Post-hoc validation (after coordination):** ```typescript coordinate({ plan: "./plan.md", agents: ["worker", "worker"], validate: true }) ``` **Real-time streaming validation:** ```typescript coordinate({ plan: "./plan.md", agents: ["worker", "worker"], validateStream: true }) ``` **Standalone CLI:** ```bash validate-coord ~/.pi/sessions/default/coordination/abc123 validate-coord ./my-coord-dir --plan ./plan.md validate-coord ./my-coord-dir --json ``` ### Invariants Checked | Invariant | Category | Description | |-----------|----------|-------------| | Session Lifecycle | Hard | Exactly one session_started and session_completed | | Worker Lifecycle | Hard | All spawned workers started and completed/failed | | Contract Fulfillment | Hard | All contracts with waiters were signaled and received | | Cost Accounting | Soft | Costs sum correctly across phases and workers | | Reservation Integrity | Hard | All reservations granted were released, no conflicts | | Causality Validity | Soft | All causal links reference valid events, no cycles | | Phase Ordering | Hard | Phases execute in correct order without overlap | | No Orphaned Resources | Soft | All created resources were properly released | | Content Validation | Soft | Expected files exist and have content | ## Output Retrieval (Artifacts) Worker outputs are written to artifacts under the coordination directory. When previews are truncated, use the `coord_output` tool to fetch full output. ```typescript coord_output({ ids: ["worker-04ea"] }) coord_output({ ids: ["scout", "review"], coordDir: "/path/to/coordDir", format: "stripped" }) ``` ## Async Mode Async runs start a detached runner and return immediately. Completion is delivered via `coordination:complete` on the shared event bus and a result file in the async results directory. - Results directory: `/tmp/pi-async-coordination-results` (override with `asyncResultsDir`) - Durable status: `coordDir/async/status.json` - Logs: `coordination-log-*.md` saved to `coordDir` by default in async runs **Note:** If using the [rewind extension](https://github.com/nicobailon/pi-rewind-hook), avoid restoring files via `/branch` while async coordination is running. Workers write files concurrently; restoring mid-flight can cause inconsistent state or worker failures. ## Agent Customization Agent prompts are defined in markdown files with YAML frontmatter: ```yaml --- name: my-agent description: What this agent does model: claude-sonnet-4-20250514 tools: read, bash system-prompt-mode: override --- Your custom system prompt here... ``` **Frontmatter options:** | Option | Description | |--------|-------------| | `name` | Agent identifier (required) | | `description` | Human-readable description (required) | | `model` | Model override for this agent | | `tools` | Comma-separated tool list | | `system-prompt-mode` | `append` (default) or `override` | **System prompt modes:** - `append` — Agent prompt is **added** to pi's default coding assistant prompt - `override` — Agent prompt **replaces** pi's default prompt entirely The coordination agents use these modes: | Agent | Mode | Reason | |-------|------|--------| | coordinator | override | Manages workflow, doesn't write code | | planner | override | Creates task graphs, no coding tools needed | | reviewer | override | Reviews changes, only needs read/bash | | scout | override | Analyzes codebase, specific output format | | worker | append | Writes code, needs full coding assistant context | ## Coordination Data Layout ``` coordDir/ ├── tasks.json # Task queue with priority and dependencies ├── state.json # CoordinationState ├── cost.json # CostState ├── deps.json # Dependency graph (blocks, parent, waits-for) ├── events.jsonl # All coordination events ├── decisions.jsonl # Coordinator decision audit trail ├── progress.md # Human-readable progress ├── coordinator-context.md # Coordinator session context ├── coordinator-context.json # Coordinator context (JSON for parsing) ├── discoveries.json # Shared discoveries ├── message-read.json # Tracks read messages per worker ├── worker-{workerId}.json # Per-worker state files ├── workers/ # Per-task worker context │ └── {task-id}/ │ ├── context.md # Persistent context (survives restarts) │ ├── attempt-001.json # First attempt state │ └── attempt-002.json # Second attempt state ├── nudges/ # Supervisor -> Worker nudges │ └── {workerId}.json ├── messages/ # Coordination messages (unified) │ └── {timestamp}-{id}.json ├── reservations/ # File reservations ├── escalation-responses/ # User escalation responses ├── artifacts/ # Per-agent artifacts ├── checkpoints/ # Phase checkpoints └── traces/ # Observability traces ``` ## Files ``` extensions/coordination/ # Symlinked to ~/.pi/agent/extensions/coordination/ ├── index.ts # Main extension entry point ├── coordinator.ts # Coordinator-specific hooks ├── worker.ts # Worker hooks + self-review ├── planner.ts # Planner hooks (read_context) ├── scout.ts # Scout hooks (bundle tools) │ ├── plan/ # Plan tool (interview -> spec) │ ├── index.ts # plan() tool entry point │ ├── interview.ts # Multi-round interview (60s timeout) │ ├── scout-targeted.ts # Targeted codebase analysis │ ├── elaborate.ts # Frontier model elaboration │ ├── structure.ts # Convert to TASK-XX format │ └── handoff.ts # Execute/refine/exit prompt │ ├── coordinate/ # Coordination runtime │ ├── index.ts # coordinate() tool │ ├── dashboard.ts # /jobs command TUI + MiniDashboard widget │ ├── pipeline.ts # Multi-phase orchestration │ ├── spec-parser.ts # Parse TASK-XX format │ ├── spec-validator.ts # Validate spec rules │ ├── state.ts # FileBasedStorage + message tracking │ ├── task-queue.ts # TaskQueueManager (priority-aware) │ ├── deps.ts # Dependency graph module │ ├── subtasks.ts # Subtask creation/blocking │ ├── worker-context.ts # Per-task context persistence │ ├── auto-continue.ts # Smart restart logic │ ├── coordinator-context.ts # Session-level context │ ├── supervisor.ts # Stuck worker detection │ ├── nudge.ts # Supervisor nudge protocol │ ├── question-generator.ts # LLM clarifying question generation │ ├── inline-questions-tui.ts # Sequential questions TUI │ ├── coordinator-tools/ # Coordinator tools │ ├── worker-tools/ # Worker tools (v2 unified API) │ ├── phases/ # Phase runners (review, fix) │ ├── observability/ # Events, spans, decisions, causality │ └── validation/ # Invariant checking │ ├── coord-output/ # coord_output() tool ├── read-context/ # read_context() tool ├── bundle-files/ # scan_files(), bundle_files() tools ├── subagent/ # Shared agent utilities + SDK runner └── validate-coord/ # Standalone validation CLI agents/ # Symlinked to ~/.pi/agent/agents/coordination/ ├── coordinator.md ├── worker.md ├── scout.md ├── planner.md └── reviewer.md skills/coordination/ # Symlinked to ~/.pi/agent/skills/coordination/ └── SKILL.md ``` ## Credits Inspired by and built on ideas from: - **[RepoPrompt](https://repoprompt.com/)** by [@pvncher](https://x.com/pvncher) — The original scout/context bundling approach - **[Ralph Wiggum Loop](https://ghuntley.com/ralph/)** by [@GeoffreyHuntley](https://x.com/GeoffreyHuntley) — One task per agent, fresh context each time - **[MCP Agent Mail](https://github.com/Dicklesworthstone/mcp_agent_mail)** by [@doodlestein](https://x.com/doodlestein) — Agent-to-agent messaging and file reservations - **[Beads](https://github.com/steveyegge/beads)** by [@Steve_Yegge](https://x.com/Steve_Yegge) — Task graph decomposition patterns - **[pi](https://github.com/badlogic/pi-mono/)** by [@badlogicgames](https://x.com/badlogicgames) — The agent framework powering all of this ## License MIT

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Multi-agent coordination for parallel plan execution with the coordinate and coord_output tools.

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2026-01-09

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