Concurrency Model (Phase 5)

Concurrency Model (Phase 5)

When tasks are marked [parallel]:

1. Orchestrator launches multiple implementer agents simultaneously
2. Hook blocks git commit for any Bash call when parallel tasks are in_progress
3. After all parallel agents complete, orchestrator does one batch git commit
4. The Go MCP server uses mutex-based locking for concurrent state.json updates

Sequential tasks self-commit and run one at a time.

Hook Enforcement

The pre-tool-hook.sh Rule 2 detects parallel execution by checking whether any tasks have implStatus == "in_progress" in state.json. If multiple tasks are in progress simultaneously, any git commit Bash call exits with code 2 (blocked).

See Hooks & Guardrails and Guard Catalogue (Rule R2) for details.