---
phase: 02-diagnostics-documentation
plan: 01
subsystem: hooks, documentation
tags: [hook-diagnostics, verbose-mode, sidecar-hint, adoption-log, codex-ceiling]

# Dependency graph
requires:
  - phase: 01-symbol-disambiguation
    provides: rustfmt compliance, test patterns, CI-passing baseline
provides:
  - "HOOK-01: NoSidecar log entries distinguish sidecar_port_missing vs sidecar_port_stale with project_root"
  - "HOOK-02: SYMFORGE_HOOK_VERBOSE=1 env var enables stderr diagnostics"
  - "HOOK-03: One-time sidecar hint with 30-min freshness marker"
  - "DOCS-01: docs/codex-integration-ceiling.md (297 lines)"
  - "DOCS-02: CLAUDE.md references codex ceiling doc"
  - "8 unit tests locking HOOK-01/02/03 behavior"
affects: []

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Marker file with freshness window for one-time user hints"
    - "Structured detail fields in adoption log (tab-separated key=value)"
    - "Env var gated verbose diagnostics with [symforge-hook] prefix"

key-files:
  created: []
  modified:
    - src/cli/hook.rs
    - .planning/REQUIREMENTS.md

key-decisions:
  - "Tests written as unit tests inside hook.rs (not integration tests) to avoid pub(crate) visibility changes"
  - "Unsafe blocks used for env var manipulation in tests (Rust 2024 edition requirement)"
  - "Kilo Code's implementation committed as-is after verification -- no gaps found"

patterns-established:
  - "SAFETY comment pattern for unsafe env var ops in tests: tests run with --test-threads=1"

requirements-completed: [HOOK-01, HOOK-02, HOOK-03, DOCS-01, DOCS-02]

# Metrics
duration: 7min
completed: 2026-03-20
---

# Phase 2 Plan 1: Hook Diagnostics & Documentation Summary

**Hook verbose mode, port-missing vs stale NoSidecar detail, one-time sidecar hint, and Codex ceiling doc -- all 8 milestone requirements complete**

## Performance

- **Duration:** 7 min
- **Started:** 2026-03-20T10:25:19Z
- **Completed:** 2026-03-20T10:32:00Z
- **Tasks:** 3
- **Files modified:** 2

## Accomplishments
- Committed and verified Kilo Code's HOOK-01/02/03 implementation (127 insertions in hook.rs)
- Added 8 unit tests covering all three HOOK requirements: verbose env var behavior, adoption log detail fields, and sidecar hint marker freshness
- Marked all 8 milestone requirements (SYMB-01/02/03 + HOOK-01/02/03 + DOCS-01/02) complete in REQUIREMENTS.md

## Task Commits

Each task was committed atomically:

1. **Task 1: Commit and verify Kilo Code's hook diagnostics implementation** - `1a273dc` (feat)
2. **Task 2: Add tests for HOOK-01/02/03 behavior** - `cd738af` (test + fix for Rust 2024 unsafe)
3. **Task 3: Mark DOCS-01 and DOCS-02 complete in REQUIREMENTS.md** - `214da95` (docs)

## Files Created/Modified
- `src/cli/hook.rs` - Hook diagnostics: NoSidecarDetail struct, is_hook_verbose, maybe_emit_sidecar_hint, emit_no_sidecar_diagnostic, 8 new unit tests
- `.planning/REQUIREMENTS.md` - All 8 requirements marked complete, traceability table updated

## Decisions Made
- Kilo Code's implementation was correct and complete -- committed without modifications
- Unit tests placed inside hook.rs `mod tests` block to access private functions directly
- Used `unsafe` blocks for `std::env::set_var`/`remove_var` per Rust 2024 edition requirements

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Wrapped env var ops in unsafe blocks for Rust 2024 edition**
- **Found during:** Task 2 (adding HOOK-02 tests)
- **Issue:** `std::env::set_var` and `std::env::remove_var` are unsafe in Rust 2024 edition (cargo edition = 2024, rustc 1.94.0)
- **Fix:** Wrapped all env var set/remove calls in `unsafe { }` blocks with SAFETY comments
- **Files modified:** src/cli/hook.rs
- **Verification:** `cargo test --all-targets -- --test-threads=1` passes all 1193+ tests
- **Committed in:** cd738af

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Minimal -- required for compilation under Rust 2024 edition. No scope creep.

## Issues Encountered
- Kilo Code had created an intermediate commit (4a4aae3) that included tests and doc changes; this was already present in git history and the Task 2 work built on top of it

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- All 8 milestone requirements are complete
- Milestone v1.6 is fully done -- no remaining phases or plans

---
*Phase: 02-diagnostics-documentation*
*Completed: 2026-03-20*
