# Review by Principal Systems Engineer (Google/Stripe caliber) (Round 1)

---

## Review Complete

**VERDICT: approve**

**FINDINGS:**
- **[src/colonyos/tui/app.py]**: `_run_active` flag accessed from multiple threads without synchronization — low blast radius but should use `threading.Event` for correctness
- **[src/colonyos/tui/app.py:326]**: `call_from_thread()` in `finally` block can raise `RuntimeError` during app teardown — wrap in try/except
- **[src/colonyos/tui/adapter.py]**: `CommandOutputMsg` not sanitized at adapter level — split responsibility creates future risk if new queue consumers are added
- **[src/colonyos/router.py]**: Two parallel LLM classification systems (`route_query` + `choose_tui_mode`) — document intended lifecycle
- **[tests/test_cli.py:2773-2780]**: Two sweep CLI tests still conditionally skipped despite command being registered

**SYNTHESIS:**
This is a substantial, well-executed implementation covering three PRDs (Interactive TUI, TUI-as-default with smart routing, and `colonyos sweep`). The architecture follows established patterns — the `TextualUI` adapter cleanly implements the existing `PhaseUI` duck-type contract, the janus queue provides a correct async↔sync bridge, and the sweep command reuses the existing pipeline without forking any phase logic. All **1898 tests pass** with zero regressions. Thread safety concerns around `_run_active` are real but low-impact: the single-writer-via-`call_from_thread` pattern means the worst case is a cosmetic UI glitch, not data corruption or lost work. Sanitization coverage is thorough — the ANSI regex hardening and carriage return overwrite attack mitigation show good security awareness. The secret-path detection in preflight recovery is a nice defense-in-depth addition. The two skipped sweep CLI tests and the dual routing system are minor loose ends worth tracking. Overall, this is production-ready code with the right trade-offs for a v1 ship. The findings above are hardening improvements for a follow-up pass, not blockers.
