# Review by Principal Systems Engineer (Google/Stripe caliber) (Round 2)

Now I have a comprehensive view. Let me write the review.

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## Review: Principal Systems Engineer Perspective

I've reviewed the full implementation across 72 changed files (~9,084 lines added) on branch `colonyos/implement_the_latest_prd_tasks_file` against three PRDs covering: (1) Interactive TUI, (2) TUI UX fixes + smart routing, and (3) `colonyos sweep` command.

### Completeness Assessment

**TUI (PRD 1 - FR-1 through FR-8):** ✅ All implemented
- FR-1: `colonyos tui` and `--tui` flag — present
- FR-2: TranscriptView with RichLog — present
- FR-3: Composer with auto-grow — present
- FR-4: StatusBar with phase/cost/turns/elapsed — present
- FR-5: TextualUI adapter with 8-method interface — present
- FR-6: Keybindings (Ctrl+C, Ctrl+L, Escape) — present
- FR-7: Optional dependency `[tui]` — present
- FR-8: Output sanitization — present

**TUI UX + Smart Routing (PRD 2):**
- FR-1: Ctrl+C termination with double-Ctrl+C force-quit ✅
- FR-2: TUI as default for interactive use ✅
- FR-3: Shift+Enter / Ctrl+J newline insertion ✅
- FR-4: Composer minimum height ✅
- FR-5: Ant-colony themed idle visualization ✅
- FR-6: Mid-run user injection ✅
- FR-7: Smart routing with complexity classification ⚠️ **PARTIALLY IMPLEMENTED** — the `complexity` field is added to `RouterResult`, parsed correctly, and logged, but **never used to actually skip planning**. `_route_prompt()` never sets `skip_planning=True` on `RouteOutcome`. The fast-path code in the orchestrator (`skip_planning=True` → skip PLAN phase) is wired correctly but unreachable from the router. This is dead code for the complexity-based skip path.

**Sweep (PRD 3 - FR-1 through FR-7):** ✅ All implemented
- FR-1: `sweep` CLI command with all flags — present
- FR-2: `Phase.SWEEP` enum value — present
- FR-3: `instructions/sweep.md` template — present and thorough
- FR-4: `run_sweep()` orchestration with dry-run/plan-only/execute modes — present
- FR-5: `SweepConfig` dataclass with validation — present
- FR-6: Rich-formatted dry-run report — present
- FR-7: Single PR per sweep via `run()` delegation — present

### Quality Assessment

**Tests:** All 1,922 tests pass. Comprehensive test coverage across `test_sweep.py` (603 lines), TUI tests (7 test modules totaling ~1,700+ lines), extended `test_router.py`, `test_orchestrator.py`, and `test_cli.py`.

**Code conventions:** Consistent with existing patterns. Frozen dataclasses for thread-safe message types, duck-typed UI interface preserved, Click decorators follow existing conventions.

**Thread safety:** The janus queue bridge pattern is well-implemented. `TextualUI` uses `Lock` for user injection deque, `call_from_thread` for UI updates from worker threads, `exclusive=False` to avoid canceling active workers on new submissions.

**Error handling:** Good coverage — `PreflightError` caught in worker lifecycle, graceful fallback when Textual not installed, audit logging wrapped in try/except.

### Safety Assessment

- ✅ No secrets or credentials in committed code
- ✅ All user/agent output sanitized via `sanitize_display_text()` / `sanitize_untrusted_content()`
- ✅ Sweep analysis phase restricted to read-only tools (`Read`, `Glob`, `Grep`)
- ✅ Review phase is never skipped regardless of complexity
- ✅ Double Ctrl+C → `SystemExit(1)` as safety valve

### Concerns from a 3am-Debugging Perspective

1. **Dead complexity-based routing (MEDIUM):** The complexity field flows through the system (router → `RouterResult` → logged) but never influences behavior. At 3am when you're debugging why a "fix typo" prompt went through the full 5-phase pipeline, you'd be confused seeing `complexity: "small"` in the router logs but no corresponding skip.

2. **Silent audit log failures (LOW):** In `sweep()` CLI (line ~4302), exceptions from `write_cleanup_log()` are silently swallowed. At 3am you'd want at least a debug log line to know why your audit trail is empty.

3. **`max_files_per_task` is configured but unused (LOW):** `SweepConfig.max_files_per_task` exists in the config dataclass and is validated, but the sweep instruction template doesn't reference it or enforce it. It's harmless dead config but creates confusion.

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VERDICT: request-changes

FINDINGS:
- [src/colonyos/cli.py]: `_route_prompt()` never sets `skip_planning=True` on `RouteOutcome` based on the router's `complexity` field. FR-7 from PRD 2 (Smart Routing with Complexity Classification) is partially implemented — the field exists and is parsed/logged, but has no effect on planning behavior. The `skip_planning` wiring in the orchestrator is correct but unreachable.
- [src/colonyos/cli.py:~4302]: Audit log write failures in `sweep()` command are silently swallowed — add at least a `logger.debug()` call for debuggability.
- [src/colonyos/config.py]: `SweepConfig.max_files_per_task` is validated and persisted but never referenced by sweep analysis logic or the instruction template.

SYNTHESIS:
This is a substantial, well-engineered implementation covering the TUI system, sweep command, and smart routing infrastructure. The architecture is sound — the janus queue bridge for thread-safe TUI updates, the frozen dataclass message types, the read-only tool restriction for sweep analysis, and the careful Ctrl+C cancellation chain all demonstrate production-grade thinking. Test coverage is thorough with 1,922 tests passing. However, there is one meaningful functional gap: the complexity-based planning skip (PRD 2 FR-7) is wired at the infrastructure level but never activated — the router produces `complexity` classifications that are logged and forgotten. This should either be connected (set `skip_planning=True` in `RouteOutcome` when `complexity in ("trivial", "small")` and category is a code change) or explicitly deferred with a documented decision. The other findings are minor observability improvements.
