# Review: Linus Torvalds — Kernel-Level Systems & Code Quality

**Branch:** `colonyos/when_you_output_followups_in_the_thread_on_slack_a938599349`
**Round:** 1
**Tests:** 131 pass (test_slack_formatting.py + test_sanitize.py)
**Diff:** +1,300 / -23 lines across 6 files (2 source, 2 test, 2 review artifacts)

## Assessment

This is clean, straightforward work. The data structures are right: task descriptions and review findings are extracted from existing artifacts with simple string operations — no regex gymnastics, no new LLM calls, no clever abstractions. The three-tier fallback in `_extract_review_findings_summary()` (FINDINGS -> SYNTHESIS -> first line) handles real-world variance without overengineering. Sanitization is applied at the content boundary, not the output boundary, which is the correct architecture. The named constants (`_SLACK_MAX_CHARS`, `_SLACK_MAX_SHOWN_TASKS`, etc.) make the truncation limits grep-able. The test coverage is solid — 131 tests covering the formatting functions, sanitization edge cases, and constant values. The code does what it says, says what it does, and doesn't try to be clever. Ship it.

## Checklist

- [x] FR-1: Task completion messages include description
- [x] FR-2: Task outline uses bullet formatting
- [x] FR-3: Task result summary includes descriptions with cost/duration
- [x] FR-4: Review round messages include finding summaries
- [x] FR-5: Sanitization of all user-derived content
- [x] All 131 tests pass
- [x] No placeholder/TODO code
- [x] No secrets in committed code
- [x] No unnecessary dependencies added
- [x] Zero new LLM calls

## Findings (Non-Blocking)

- **[src/colonyos/sanitize.py]**: `_SLACK_BARE_LINK_RE` only matches `https?://` schemes but `_SLACK_LINK_INJECTION_RE` covers arbitrary schemes — a `<slack://deep-link>` bare link (no pipe) bypasses the bare link regex and leaves angle brackets in output. Low risk since such links must survive `sanitize_untrusted_content()` first, but the asymmetry is sloppy.
- **[src/colonyos/orchestrator.py]**: Phase header description truncation uses hardcoded `60`/`57` instead of `_SLACK_TASK_DESC_MAX` (72). The rest of the codebase correctly uses the named constant. Pick one number and use the constant.
- **[src/colonyos/orchestrator.py]**: `_extract_review_findings_summary` — blank-line handling inside the FINDINGS parser (`continue` on empty lines) means a review with blank lines between findings followed by prose will keep collecting. The review template doesn't produce this in practice, but the state machine is slightly loose.
- **[src/colonyos/orchestrator.py]**: `_format_task_list_with_descriptions` silently swallows `ValueError`/`TypeError` on cost/duration formatting. A `logger.debug` would cost nothing and save future debugging time.

---

VERDICT: **approve**
