# Review by Staff Security Engineer (Round 1)

## Review Complete — Staff Security Engineer

**VERDICT: approve**

All 7 functional requirements from the PRD are fully implemented with 235 passing tests and no regressions. Here's the summary:

### Key Findings

| Area | Assessment |
|------|-----------|
| **Completeness** | All FRs implemented (agent resume, CLI wiring, `/new` command, fallback, REPL + TUI) |
| **Tests** | 235 pass, 0 fail — comprehensive unit + integration coverage |
| **Session ID Safety** | Low risk — IDs are opaque SDK strings, never used in filesystem paths |
| **Graceful Fallback** | Well-done — retry without resume on failure, clear stale state |
| **Permission Model** | Existing `bypassPermissions` default is unchanged; resumed sessions extend the trust window (acceptable for v1) |
| **Supply Chain** | No new dependencies |
| **Audit Trail** | Session IDs logged in run files, resume events tracked with timestamps |

### Recommendations (non-blocking)

1. **Session ID validation**: Add a format assertion (alphanumeric + hyphens) as defense-in-depth before passing to SDK
2. **Turn cap consideration**: Unbounded session resume means unlimited `bypassPermissions` turns — monitor and revisit if cross-restart persistence is added
3. **Task file hygiene**: Checkboxes in the task file are all unchecked despite implementation being complete

Review artifact written to `cOS_reviews/reviews/staff_security_engineer/20260326_review_direct_agent_session_persistence.md`.