# Decision Gate — Handle 529 Overloaded Errors with Retry and Optional Model Fallback

**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`
**Date**: 2026-03-30

## Persona Verdicts

| Persona | Verdict | Round |
|---------|---------|-------|
| Andrej Karpathy | ✅ approve | Round 4 |
| Linus Torvalds | ✅ approve | Round 4 |
| Principal Systems Engineer | ✅ approve | Round 4 |
| Staff Security Engineer | ✅ approve | Round 4 |

**Tally: 4/4 approve, 0 request-changes**

## Findings Summary

| Severity | Count | Details |
|----------|-------|---------|
| CRITICAL | 0 | — |
| HIGH | 0 | — |
| MEDIUM | 0 | — |
| LOW | 2 | Word-boundary regex false positive on "line 529"; `retry_config=` threaded through ~20 call sites |
| INFO | 1 | No circuit breaker for parallel retry storms (acceptable at current scale) |

```
VERDICT: GO
```

### Rationale
All four personas unanimously approve after four rounds of review and fixes. All 10 functional requirements from the PRD are fully implemented across 1,962 lines of changes in 12 files. 447 tests pass with zero regressions, including 57+ new tests covering retry logic, fallback behavior, safety-critical phase guards, config validation, and serialization round-trips. No CRITICAL or HIGH findings remain — only LOW-severity known edge cases (word-boundary regex on "line 529", verbose config threading) that are well-documented and explicitly accepted as v1 tech debt.

### Unresolved Issues

(None blocking — all items below are documented and accepted for v1)

### Recommendation
Merge as-is. The implementation is production-ready with solid architecture (retry at the transport layer, invisible to the orchestrator), comprehensive test coverage, and proper security guards (fallback model allowlist, safety-critical phase blocking, error message sanitization).
