# Review by Andrej Karpathy (Round 3)

I now have a comprehensive picture of the implementation. Let me write the review.

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## Review — Andrej Karpathy

### Completeness

- [x] **FR-1 (TUI Entry Point)**: `colonyos tui` command and `--tui` flag both present, with graceful ImportError fallback.
- [x] **FR-2 (Transcript Pane)**: `TranscriptView` extends `RichLog` directly with methods for all callback types. Auto-scroll with threshold tracking. Markdown detection heuristic.
- [x] **FR-3 (Composer Pane)**: Multi-line `TextArea` with auto-grow (3→8 lines). Enter submits, Shift+Enter/Ctrl+J inserts newline. Clears on submit.
- [x] **FR-4 (Status Bar)**: Phase name, cost, turns, elapsed time, spinner during active phases. All update methods present.
- [x] **FR-5 (TextualUI Adapter)**: 8-method duck-type interface implemented. Thread-safe via janus queue. Frozen dataclasses for message passing.
- [x] **FR-6 (Keybindings)**: Enter, Shift+Enter, Ctrl+C, Ctrl+L, Escape all wired.
- [x] **FR-7 (Optional Dependency)**: `tui = ["textual>=0.40", "janus>=1.0"]` in pyproject.toml, import-guarded.
- [x] **FR-8 (Output Sanitization)**: All adapter output passes through `sanitize_display_text()`. Sanitizer fixed to preserve \t, \n, \r.

### Quality

- [x] All tests pass: 1689 existing tests + 86 new TUI tests + 53 sanitize tests = zero regressions.
- [x] Code follows existing project conventions (PhaseUI duck-type pattern, TOOL_STYLE reuse, optional dependency grouping).
- [x] No unnecessary dependencies — only `textual` and `janus`, both well-scoped.
- [x] No unrelated changes (sanitizer fix is directly motivated by TUI rendering needs).

### Safety

- [x] No secrets or credentials in committed code.
- [x] Sanitization prevents terminal escape injection from untrusted output.
- [x] Error handling present for ImportError, empty input, queue lifecycle.

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VERDICT: approve

FINDINGS:
- [src/colonyos/tui/adapter.py]: Clean adapter pattern — frozen dataclasses as queue messages is the right call. Thread-safe by construction, no shared mutable state between producer and consumer. The early-emit optimization for tool args (parsing partial JSON until it becomes valid) is a nice touch that mirrors how streaming UIs should work.
- [src/colonyos/tui/app.py]: `run_worker(thread=True, exclusive=True)` correctly prevents concurrent orchestrator runs. The janus queue lifecycle (create on mount, cancel consumer + close on unmount) is properly managed. One minor observation: `_run_callback` is assigned via `app_instance._run_callback = _run_callback` after construction — this works but is a private attribute mutation pattern. Functional, not dangerous, but worth noting.
- [src/colonyos/tui/widgets/transcript.py]: `_looks_like_markdown()` regex heuristic is simple and appropriate for v1. False positives just mean slightly fancier rendering — graceful degradation in the right direction.
- [src/colonyos/tui/widgets/composer.py]: The `_on_key` override intercepting Enter vs Shift+Enter is the standard Textual pattern. Auto-grow via `TextArea.Changed` is clean.
- [src/colonyos/tui/widgets/status_bar.py]: Spinner timer at 100ms (10fps) is reasonable. `_stop_spinner` / `_start_spinner` are idempotent. `set_interval` returns a `Timer` that gets properly stopped.
- [src/colonyos/sanitize.py]: The fix to preserve `\t`, `\n`, `\r` while still stripping dangerous control chars (bell, backspace, C1 codes) is correct and well-tested. This was a latent bug that would have broken any multi-line rendering path.
- [src/colonyos/cli.py]: A new `TextualUI` adapter is created per callback invocation inside `_run_callback` — this means each user submission gets a fresh adapter with `_turn_count=0`. This is probably fine for v1 (turns reset per submission), but if you want cumulative turn counts across a session, the adapter would need to persist.
- [tests/tui/test_adapter.py]: 352 lines of adapter contract tests with a `FakeSyncQueue` stand-in — tests the important invariants (sanitization, flush-before-phase-transition, text-during-tool-ignored, incremental JSON parsing) without requiring Textual's event loop. This is exactly the right testing strategy.

SYNTHESIS:
This is a well-scoped v1 that treats the existing PhaseUI callback interface as the contract and doesn't try to reinvent the event model. The key architectural decision — frozen dataclasses over a janus queue bridging the sync orchestrator thread to Textual's async event loop — is the minimal correct solution. The adapter is effectively a "prompt compiler" that translates the 8 callback methods into structured messages, and the app is the "runtime" that renders them. I particularly like that the adapter tests don't depend on Textual at all (using `FakeSyncQueue`), which means the most important logic — sanitization, buffering, tool arg extraction — is tested without the complexity of an async UI framework. The sanitizer fix to preserve whitespace characters is a genuine bug fix that was exposed by the TUI work. The one thing I'd watch in production is the per-submission adapter creation (fresh turn count each time), but for v1's scope this is fine. Overall: clean, minimal, ships the smallest useful thing. Approve.