---
phase: 02-config-overlays
plan: 02
subsystem: config
tags: [cli, doctor, overlay, FLYNN_ENV, diagnostics]

# Dependency graph
requires:
  - phase: 02-config-overlays
    provides: resolveOverlayPath from cli/shared.ts for FLYNN_ENV resolution
provides:
  - checkOverlayExists doctor check for overlay file validation
affects: [03-live-ops-dashboard]

# Tech tracking
tech-stack:
  added: []
  patterns: [doctor-check-pattern, skip-pass-fail-tristate]

key-files:
  created: []
  modified:
    - src/cli/doctor.ts

key-decisions:
  - "Overlay check placed after checkConfigExists, before checkConfigParses — natural validation order"
  - "Skip status when FLYNN_ENV not set — no noise for users without overlays"

patterns-established:
  - "Doctor check tristate: skip (not applicable) / pass (found) / fail (missing)"

# Metrics
duration: 1min
completed: 2026-02-10
---

# Phase 2 Plan 2: Doctor Overlay Validation Summary

**checkOverlayExists doctor check validates FLYNN_ENV overlay file exists with skip/pass/fail tristate reporting**

## Performance

- **Duration:** ~1 min (52s)
- **Started:** 2026-02-10T04:59:35Z
- **Completed:** 2026-02-10T05:00:27Z
- **Tasks:** 1
- **Files modified:** 1

## Accomplishments
- Added checkOverlayExists to flynn doctor checks array
- When FLYNN_ENV is set, reports pass (file found) or fail (file missing with path detail)
- When FLYNN_ENV is not set, check is skipped silently
- Positioned after checkConfigExists, before checkConfigParses for natural validation flow

## Task Commits

Each task was committed atomically:

1. **Task 1: Add checkOverlayExists to doctor.ts** - `6bd3721` (feat)

## Files Created/Modified
- `src/cli/doctor.ts` - Added checkOverlayExists check function and inserted into allChecks array after checkConfigExists

## Decisions Made
- Placed overlay check between checkConfigExists and checkConfigParses — validates files exist before attempting to parse/validate them
- Used 'skip' status when FLYNN_ENV is not set to avoid noise for users not using overlays

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

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

## Next Phase Readiness
- Phase 2 (Config Overlays) complete — both overlay merge and doctor validation shipped
- Ready for Phase 3 (Live Ops Dashboard)

---
*Phase: 02-config-overlays*
*Completed: 2026-02-10*