📖 New to harness? Read README.md (日本語: README.ja.md) for concepts, terminology (Tier-A / rubric / Principal Skinner / foundation-sprint / ...), and the three-skill overview before diving into implementation details.

harness-loop — Autonomous Sprint Execution Loop

Orchestrator for the GAN control loop. Consumes the sprint backlog produced by harness-plan and runs each sprint through Negotiation → Implementation → PR. Every state transition lands in .harness/progress.md, .harness/_state.json, .harness/metrics.jsonl, and git so the loop survives context compaction and session restarts.

Roles dispatched through this orchestrator:

• Planner (Claude) — stalemate arbiter and replanner
• Generator (Claude / Codex CLI / Codex via cmux / other MCP) — writes code per _config.yml.generator_backend
• Evaluator (Claude + Playwright MCP / Playwright CLI / curl / custom-script) — scores rubric

Orchestrator responsibility (read first)