OpenCastle

Turn your AI coding assistant into a multi-agent team.

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Works with GitHub Copilot, Cursor, Claude Code, OpenCode, Windsurf, Codex CLI, and Antigravity.

One command sets up specialized agents that decompose tasks, work in parallel, and verify each other's output — interactively through IDE chat or automated via the Convoy Engine.

Use it live in your IDE. Run it overnight with the CLI.

Quick Start

npx opencastle init

The CLI asks about your IDEs and stack. It installs agents, skills, and MCP servers tailored to your project.

You can select multiple IDEs and tools — the output is adapted for each one.

What gets generated

MCP servers are auto-configured for your stack in each IDE's native format.

Project CLI

Convoy CLI

Observability CLI

Add --dry-run to any command to preview what it would change without writing files.

📖 Full CLI documentation →

What's Inside

Specialist Agents. Developer, UI/UX, Database, Security, Testing, Reviewer, and more.

On-Demand Skills. Loaded on demand to keep context windows lean. Auto-selected during init based on your stack. All 51 skills and plugins scored 100% on the tessl Skill Evaluator.

Workflow Templates. Features, bug fixes, data pipelines, security audits — reproducible execution templates.

Quality gates. Fast review after every step. Panel majority vote for high-stakes changes. Lint, test, build checks.

Cost-aware routing. Picks the right model tier (Premium → Quality → Standard → Fast → Economy) based on task complexity.

Self-improving. Agents capture lessons and graduate them into permanent instructions.

Hybrid by design. Use OpenCastle interactively through IDE chat for hands-on development, or run automated batch jobs overnight via the Convoy Engine.

Dashboard

npx opencastle dashboard

Visualizes real agent data from your project — sessions, success rates, model usage, execution logs, and panel reviews.

Reads from the same NDJSON logs your agents already write. No setup needed.

📖 Dashboard CLI documentation →

Doctor

npx opencastle doctor

Runs multiple health checks — manifest, configs, skills, observability logs, IDE settings, MCP setup, and environment variables. Useful in CI or after upgrading.

📖 Doctor CLI documentation →

A deterministic, crash-recoverable orchestrator inspired by Steve Yegge's Gas Town. Define tasks in YAML, run overnight, resume after crashes.

npx opencastle run convoy.yml

# convoy.yml
name: "Overnight feature batch"
version: 1
adapter: claude
branch: feat/reviews

tasks:
  - id: migrate-db
    agent: database-engineer
    prompt: "Create a reviews table migration."
    files: ["db/migrations/"]

  - id: build-component
    agent: ui-ux-expert
    prompt: "Build a ReviewCard component."
    files: ["src/components/reviews/"]

  - id: wire-page
    agent: developer
    prompt: "Add reviews to the place detail page."
    depends_on: [migrate-db, build-component]
    files: ["src/pages/places/"]

gates:
  - npm run lint
  - npm run test

• Crash-safe — SQLite WAL persistence survives crashes, power loss, OOM kills. Resume with --resume.
• Isolated — each worker runs in its own git worktree. Changes merge back in dependency order.
• Observable — real-time dashboard auto-starts during execution.
• Multi-runtime — mix Copilot, Claude Code, Cursor, OpenCode, Windsurf, Codex, and Antigravity in the same convoy.

Generate a validated convoy spec from a plain text description — no YAML by hand:

npx opencastle start --text "Add user reviews to the place detail page"

The start command runs 7 steps automatically: generate PRD → validate PRD → auto-fix PRD if needed → assess complexity → generate convoy spec → validate spec → auto-fix spec if needed. For lower-level control, use opencastle plan to run individual steps.

📖 Full Convoy Engine documentation →

Architecture

See ARCHITECTURE.md for the full diagram, workflow templates, and quality gates.

Contributing

1. Fork the repo
2. Create a branch — feat/your-feature or fix/your-fix
3. Make changes and ensure npm run build:cli passes
4. Open a PR

For large changes, open an issue first.

Support

OpenCastle is free and open-source.

For corporate sponsorship inquiries, open a GitHub Discussion.

License

MIT