# Review by Principal Systems Engineer (Google/Stripe caliber) (Round 3)

## Review Complete — Principal Systems Engineer (Round 3)

**443 tests pass. All 10 functional requirements implemented. All previous round findings resolved.**

VERDICT: approve

FINDINGS:
- [src/colonyos/orchestrator.py:2441]: `RetryInfo(**p["retry_info"])` deserializes run log JSON via blind `**kwargs` splat — if `RetryInfo` gains or loses a field, old/stale logs will raise `TypeError`. Should use explicit field extraction for forward/backward compat. LOW severity.
- [src/colonyos/agent.py:220-230]: Total attempts can reach `2 * max_attempts` when fallback is configured (e.g., 20 with `max_attempts=10`). No hard cap beyond the warning at `>10`. LOW severity — documented in docstring.
- [src/colonyos/config.py:639]: `base_delay_seconds=0` is accepted, enabling zero-delay tight retry loops. LOW severity — power-user footgun.
- [src/colonyos/agent.py:258-260]: `transient_errors += 1 if is_transient else 0` — conditional increment is correct but less readable than a simple `if` block. Cosmetic.
- [src/colonyos/orchestrator.py]: `retry_config=config.retry` threaded through 20+ call sites — acknowledged tech debt, not a blocker.

SYNTHESIS:
This is a clean, well-placed transport-level retry layer. It sits at exactly the right architectural level — inside `run_phase()`, invisible to the orchestrator's heavyweight recovery system — so transient 529 errors resolve transparently without triggering diagnostic agents or nuke recovery. The key design decisions are all correct: structured status_code detection before regex fallback with word-boundary patterns, full jitter for decorrelation across parallel phases, `resume` session ID cleared after first transient failure, frozen `RetryInfo` dataclass for immutable metadata, and hard safety gates preventing model fallback on review/decision/fix. The `_run_phase_attempt()` refactor cleanly separates the single-query concern from retry orchestration. Config validation is thorough. All 10 functional requirements implemented, all previous findings resolved, 443 tests pass with zero regressions. The remaining findings are all LOW severity polish items. Approved.
