Multiple agent calls now run concurrently, each in its own isolated git
checkout (local clone of the warm base, hardlinked objects, git-crypt
re-unlocked), so concurrent jobs never share a working tree.
- execution_lock (asyncio.Lock) -> execution_semaphore (default MAX_CONCURRENCY=10);
excess calls queue FIFO instead of 409/503. MAX_QUEUE_DEPTH safety valve.
- /execute never returns 409; jobs go queued -> running. Timeout covers
execution only, not queue wait.
- /v1/chat/completions queues for a slot instead of 503-busy.
- /health: busy = at-capacity, plus active/queued/capacity fields.
- per-job workspace prepare/cleanup under a short git lock; the agent run holds none.
- in-memory job registry evicted past JOB_TTL_SECONDS.
Design: docs/2026-06-02-parallel-execution-design.md
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
