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## Linus Torvalds Review — Round 3

**Branch**: `colonyos/the_following_github_issue_is_the_source_feature_description_treat_it_as_the_pri`
**PRD**: `cOS_prds/20260329_225200_prd_the_following_github_issue_is_the_source_feature_description_treat_it_as_the_pri.md`
**Tests**: 234 pass (test_agent.py + test_config.py + test_models.py), zero regressions
**Diff**: +1872/-83 lines across 12 files

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### Completeness

All 10 functional requirements implemented:
- FR-1: `_friendly_error()` detects overloaded/529/503 via `_TRANSIENT_PATTERNS`
- FR-2: `_is_transient_error()` — structured attributes first, regex fallback second
- FR-3: `run_phase()` retry loop with restart-from-scratch semantics
- FR-4: Defaults (3 attempts, 10s base, 120s max, full jitter)
- FR-5: `RetryConfig` dataclass, nested under `ColonyConfig`, YAML-parseable
- FR-6: Optional `fallback_model` with its own `max_attempts` pass
- FR-7: `_SAFETY_CRITICAL_PHASES` hard-blocks fallback on review/decision/fix
- FR-8: UI and log messages on retry
- FR-9: `RetryInfo` frozen dataclass on `PhaseResult`, serialized to run log
- FR-10: Parallel phases retry independently via existing `run_phases_parallel`

### Architecture Assessment

The architecture is correct. Retry lives inside `run_phase()`, below the orchestrator's recovery system. Transient 529s resolve transparently — the orchestrator never sees them. That's the right layering.

`_is_transient_error()` is clean: structured attribute first, regex fallback second. Word-boundary regexes on `\b529\b` and `\b503\b` prevent false positives on port numbers and file paths.

The `_AttemptResult` extraction is good factoring — streaming logic separated from retry logic.

`current_resume = None` after first transient error is correct — dead sessions can't be resumed.

Config validation is thorough: `max_attempts >= 1`, non-negative delays, allowlist for fallback models.

### Previous Round Findings — All Addressed

| Finding | Status |
|---------|--------|
| `_is_transient_error()` called 3x on same exception | Fixed — extracted to local `is_transient` boolean |
| `resume` kwarg leaks into retry attempts | Fixed — `current_resume` variable, cleared to `None` after first transient error |
| `_SAFETY_CRITICAL_PHASES` uses raw strings | Fixed — uses `Phase.REVIEW.value`, `Phase.DECISION.value`, `Phase.FIX.value` |
| `_friendly_error()` uses bare `"529" in lower` | Fixed — uses `_TRANSIENT_PATTERNS` regex matching |
| `for/else/continue` pattern needlessly clever | Fixed — removed `else` clause, added comment |

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VERDICT: approve

FINDINGS:
- [src/colonyos/orchestrator.py:2441]: `RetryInfo(**p["retry_info"])` trusts run log JSON without explicit field extraction — extra/missing keys cause TypeError on corrupted logs
- [src/colonyos/orchestrator.py]: `retry_config=config.retry` threaded through ~20 call sites — tech debt, omissions silently masked by default RetryConfig()
- [src/colonyos/agent.py:97-98]: `_friendly_error()` returns hardcoded "529" message even for 503 transient errors — technically wrong but cosmetic
- [src/colonyos/agent.py:386]: Defensive fallthrough uses `model` (original param) instead of `current_model` — wrong model reported if reached via fallback pass

SYNTHESIS:
This is a clean, correctly-layered transport retry system. The key architectural decision — retry inside `run_phase()`, invisible to the orchestrator — is right. The error detection is properly stratified (structured attributes first, regex fallback second). The safety-critical phase guard is correctly implemented using enum values. The code is straightforward, the data structures are obvious, and 55 new tests cover the important cases. The remaining findings are minor: one deserialization fragility issue worth a quick fix, and three cosmetic items. The implementation does what the PRD says, doesn't try to be clever, and stays out of the orchestrator's way. Ship it.
