Concerto

Turn Linear tickets into pull requests with Claude Code. Autonomously.

Concerto is an Elixir/OTP orchestrator that polls Linear for work, creates isolated workspaces, and dispatches claude -p sessions that implement changes and open PRs. Fork of OpenAI Symphony, adapted to use Claude Code natively instead of Codex.

Warning

Concerto runs Claude Code autonomously with full permissions. Only use in trusted environments with repos where autonomous changes are acceptable.

Quick start

cd elixir
brew install mise && mise trust && mise install
mix setup
export LINEAR_API_KEY=lin_api_...
# Edit WORKFLOW.md with your project slug and repo URL
make start

See elixir/README.md for full setup instructions.

How it works

1. Polls Linear for issues in active states (Todo, In Progress)
2. Creates an isolated workspace per issue
3. Clones your repo via the after_create hook
4. Dispatches claude -p with your workflow prompt
5. Claude implements the change, writes tests, opens a PR
6. Moves the issue through your Linear workflow

No API key needed — uses your Claude subscription via claude -p.

Why fork Symphony?

Symphony dispatches OpenAI Codex via JSON-RPC. Concerto replaces the entire agent runtime with Claude Code's native claude -p protocol — streaming JSON output, MCP tool injection, session continuity via --session-id, and permission handling via --permission-mode. The Elixir/OTP orchestration layer (polling, concurrency, retries, supervision) stays intact.

License

Apache License 2.0 — see LICENSE.