---
phase: 11-frame-repository-and-subset-grid-compilation
verified: 2026-04-13T06:40:00Z
status: human_needed
score: 24/24
overrides_applied: 0
human_verification:
  - test: "Start a repository capture, wait for completion, then compile a subset grid"
    expected: "start_repository_capture returns session ID immediately, frames appear on disk as JPEG files, compile_subset_grid produces a visible grid image"
    why_human: "Requires running MCP server with active screen capture -- cannot verify end-to-end capture+compilation pipeline programmatically"
  - test: "Compile two different subset grids from the same session with different query params"
    expected: "Both grids compile successfully with different frame selections, original frames remain on disk unchanged"
    why_human: "Requires active repository session with frames on disk to verify non-destructive multi-compilation"
  - test: "Label overlay renders correctly on compiled grid"
    expected: "Label text appears at the top of the grid image in white text on semi-transparent black background"
    why_human: "Visual appearance of SVG text overlay cannot be verified programmatically"
  - test: "24h retention cleanup actually removes old session directories"
    expected: "Sessions older than 24h are purged on server start and during list/query operations"
    why_human: "Requires time manipulation or waiting 24h to verify retention behavior end-to-end"
---

# Phase 11: Frame Repository and Subset Grid Compilation Verification Report

**Phase Goal:** Decouple capture from grid compilation. Long-running capture sessions persist frames to disk in a frame repository. Agents query, filter, and select subsets of stored frames to compile into grid images on demand. New MCP tools: start_repository_capture, list_repository_sessions, list_repository_frames, compile_subset_grid, delete_repository_session. Repository is session-scoped with 24h retention-based cleanup.
**Verified:** 2026-04-13T06:40:00Z
**Status:** human_needed
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | RepositoryManager can create sessions on disk with manifest.json | VERIFIED | createSession() generates UUID, creates directory, writes manifest.json (repository-manager.ts:117-158) |
| 2 | RepositoryManager can list sessions and purge expired ones (>24h) | VERIFIED | listSessions() returns sorted sessions; runRetentionCleanup() uses RETENTION_MS = 24*60*60*1000 (repository-manager.ts:247-402) |
| 3 | RepositoryManager can look up sessions by ID or by name | VERIFIED | resolveSession() tries ID first, then nameIndex lookup (repository-manager.ts:228-242) |
| 4 | RepositoryManager can delete sessions and remove their disk contents | VERIFIED | deleteSession() calls rm(recursive:true), removes from maps, returns freedBytes (repository-manager.ts:260-290) |
| 5 | RepositoryManager can append frame entries to a session manifest | VERIFIED | appendFrame() pushes entry, updates frameCount, persists via persistQueue (repository-manager.ts:164-176) |
| 6 | Frame query supports all five query modes | VERIFIED | detectQueryMode handles time_range, time_length, index_range, index_count, all (frame-query.ts:13-67) |
| 7 | Frame query rejects ambiguous parameter combinations | VERIFIED | Checks to_ms+length_ms, to_index+frame_count, time+index mixing (frame-query.ts:27-35) |
| 8 | Frame query applies max_frames even-distribution sampling | VERIFIED | sampleFrames() with step calculation, always includes first/last (frame-query.ts:77-91) |
| 9 | Change summary computed from frame manifest | VERIFIED | Timing-based: longestIdleMs from gaps, densest 5s window for mostActive (server.ts:1675-1724) |
| 10 | start_repository_capture creates disk-backed session, returns ID immediately | VERIFIED | Handler creates session via repoManager, fire-and-forget scheduler via dynamic import (server.ts:1446-1488) |
| 11 | Repository captures write JPEG frames to disk | VERIFIED | repository-scheduler.ts writes via writeFile, zero-padded filenames, awaited before manifest update (repository-scheduler.ts:44-60) |
| 12 | get_capture_status works for both in-memory and repository sessions | VERIFIED | Falls back to repoManager.getSession() when not found in memory, returns repository:true flag (server.ts:474-494) |
| 13 | list_repository_sessions shows metadata and retention deadline | VERIFIED | Returns sessionId, state, frameCount, diskUsageBytes, retentionDeadline, elapsedMs (server.ts:1505-1517) |
| 14 | delete_repository_session removes session, returns freed space | VERIFIED | Calls resolveSession then deleteSession, returns freedBytes and freedMB (server.ts:1540-1567) |
| 15 | Repository captures support screenshot_profile and timing_profile | VERIFIED | Same profile resolution blocks as start_capture copied into handler (server.ts:1285-1360) |
| 16 | Repository captures default to max_frames=200 | VERIFIED | Zod schema has .max(200), handler defaults to 200 via `resolvedArgs.max_frames ?? 200` (server.ts:1234,1423) |
| 17 | list_repository_frames returns frame manifest with optional change metrics | VERIFIED | include_changes triggers pixel-compare via extractRawPixels+compareFrames, adds change_from_previous (server.ts:1635-1663) |
| 18 | list_repository_frames accepts query params and max_frames | VERIFIED | Calls applyQuery with all query params from args (server.ts:1605-1613) |
| 19 | list_repository_frames returns change_summary | VERIFIED | Returns totalFrames, longestIdleMs, mostActiveStartMs, mostActiveEndMs (server.ts:1719-1724) |
| 20 | compile_subset_grid loads frames from disk, produces JPEG grid via compileGrid() | VERIFIED | Loads via readFile, builds CaptureFrame[], calls compileGrid() (server.ts:1818-1834) |
| 21 | compile_subset_grid supports label parameter | VERIFIED | SVG text overlay via sharp composite with escapeXml() (server.ts:1837-1848) |
| 22 | compile_subset_grid supports per-compilation diagnostic options | VERIFIED | delta_highlight, compress_idle, jpeg_quality passed to compileGrid options (server.ts:1829-1834) |
| 23 | compile_subset_grid returns metadata alongside grid | VERIFIED | Returns image block + text block with framesInGrid, timeSpanMs, gridDimensions, query, options (server.ts:1859-1893) |
| 24 | Multiple subset grids from same session without consuming frames | VERIFIED | Frames read from disk (readFile), never modified or deleted during compilation |

**Score:** 24/24 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/repository/repository-types.ts` | Types, interfaces, Zod schemas | VERIFIED | 155 lines; FrameEntry, RepositoryManifest, QueryParams, QueryMode, ChangeSummary + 6 Zod schemas |
| `src/repository/frame-query.ts` | detectQueryMode, sampleFrames, applyQuery | VERIFIED | 147 lines; all 3 functions exported with full implementations |
| `src/repository/repository-manager.ts` | RepositoryManager class + singleton | VERIFIED | 417 lines; full CRUD, disk persistence, retention cleanup, UUID validation |
| `src/repository/repository-scheduler.ts` | startRepositoryScheduler function | VERIFIED | 167 lines; disk-writing capture loop with drift correction |
| `src/server.ts` | 5 new MCP tools registered | VERIFIED | start_repository_capture, list_repository_sessions, delete_repository_session, list_repository_frames, compile_subset_grid all registered |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| repository-manager.ts | repository-types.ts | import FrameEntry, RepositoryManifest | WIRED | Line 14 |
| frame-query.ts | repository-types.ts | import FrameEntry, QueryParams, QueryMode | WIRED | Line 5 |
| repository-scheduler.ts | repository-manager.ts | repositoryManager.appendFrame/completeSession/errorSession | WIRED | Lines 55, 93, 103 |
| server.ts | repository-manager.ts | import getRepositoryManager | WIRED | Line 26; used in 6 tool handlers |
| server.ts | frame-query.ts | import applyQuery | WIRED | Line 27; used in list_repository_frames and compile_subset_grid |
| server.ts | grid-compiler.ts | compileGrid() call | WIRED | Line 1829; loads CaptureFrame[] from disk, passes to compileGrid |
| server.ts | pixel-compare.ts | extractRawPixels, compareFrames | WIRED | Line 28; used in list_repository_frames include_changes path |
| server.ts | repository-scheduler.ts | dynamic import startRepositoryScheduler | WIRED | Line 1461; fire-and-forget in start_repository_capture |

### Data-Flow Trace (Level 4)

| Artifact | Data Variable | Source | Produces Real Data | Status |
|----------|---------------|--------|--------------------|--------|
| repository-manager.ts | sessions Map | Disk scan of basePath directories + manifest.json | Yes (fs reads) | FLOWING |
| frame-query.ts | filtered frames | FrameEntry[] from session manifest | Yes (passed through from manifest) | FLOWING |
| server.ts (compile_subset_grid) | captureFrames | readFile from session directory | Yes (disk reads of JPEG files) | FLOWING |
| server.ts (list_repository_frames) | frames + change metrics | applyQuery + pixel-compare | Yes (real query filtering + optional pixel comparison) | FLOWING |

### Behavioral Spot-Checks

| Behavior | Command | Result | Status |
|----------|---------|--------|--------|
| All repository tests pass | npx vitest run src/repository/ | 36/36 tests passed | PASS |
| No type errors in source files | npx tsc --noEmit (excluding test files) | Clean | PASS |
| All 5 tools registered in server | grep for tool names in server.ts | All 5 found + get_capture_status extended | PASS |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|-----------|-------------|--------|----------|
| D-01 | 11-01 | Five query modes | SATISFIED | detectQueryMode returns all 5 modes |
| D-02 | 11-01 | max_frames even-distribution sampling | SATISFIED | sampleFrames with step calculation |
| D-03 | 11-01 | Ambiguous combo rejection | SATISFIED | Three rejection checks in detectQueryMode |
| D-04 | 11-01 | JPEG frames in session directories | SATISFIED | repository-scheduler writes {index}.jpg files |
| D-05 | 11-01 | manifest.json with metadata | SATISFIED | RepositoryManifest persisted as manifest.json |
| D-06 | 11-01 | Configurable path via env var | SATISFIED | SCREEN_TIMELAPSE_FRAMES_PATH, default .screen-timelapse/frames/ |
| D-07 | 11-01 | 24h retention cleanup | SATISFIED | runRetentionCleanup with RETENTION_MS = 24*60*60*1000 |
| D-08 | 11-01 | Explicit session deletion | SATISFIED | delete_repository_session tool with rm(recursive) |
| D-09 | 11-01 | Retention from creation time | SATISFIED | Compares against manifest.startedAt |
| D-10 | 11-02 | Disk-backed capture tool | SATISFIED | start_repository_capture with repository-scheduler |
| D-11 | 11-02 | max_frames=200 ceiling | SATISFIED | .max(200) in schema, default 200 in handler |
| D-12 | 11-02 | Async capture, poll via get_capture_status | SATISFIED | Fire-and-forget scheduler, get_capture_status fallback |
| D-13 | 11-02 | Session state tracking, live tail | SATISFIED | State: capturing/complete/error; frames queryable during capture |
| D-14 | 11-03 | compile_subset_grid produces base64 JPEG | SATISFIED | Returns image content block with mimeType image/jpeg |
| D-15 | 11-03 | Reuses compileGrid() | SATISFIED | Loads CaptureFrame[], calls compileGrid with options |
| D-16 | 11-03 | Multiple compilations from same session | SATISFIED | Frames read from disk, not consumed |
| D-17 | 11-03 | Per-compilation diagnostic options | SATISFIED | delta_highlight, compress_idle, jpeg_quality passed per call |
| D-18 | 11-02 | list_repository_sessions with retention deadline | SATISFIED | Returns retentionDeadline via getRetentionDeadline() |
| D-19 | 11-01, 11-03 | list_repository_frames with change metrics | SATISFIED | include_changes triggers pixel comparison |
| D-20 | 11-01, 11-03 | Query params for frame listing | SATISFIED | Same query params as compile_subset_grid |
| D-21 | 11-03 | Label parameter for grid overlay | SATISFIED | SVG text overlay via sharp composite |
| D-22 | 11-01, 11-03 | change_summary for session | SATISFIED | totalFrames, longestIdleMs, mostActiveStartMs, mostActiveEndMs |
| D-23 | 11-01, 11-02 | Session naming with resolveSession | SATISFIED | session_name param, nameIndex, resolveSession by ID or name |
| D-24 | 11-02 | Delete by ID or name, return freed space | SATISFIED | resolveSession + deleteSession returns freedBytes/freedMB |
| D-25 | 11-03 | Metadata alongside grid | SATISFIED | framesInGrid, timeSpanMs, gridDimensions, query, options |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| None | - | - | - | No anti-patterns detected |

### Human Verification Required

### 1. End-to-End Repository Capture Pipeline

**Test:** Start a repository capture session, wait for it to complete, verify frames on disk, then compile a subset grid.
**Expected:** Frames appear as zero-padded JPEG files in session directory, manifest.json updated with each frame, compiled grid image is valid and shows captured content.
**Why human:** Requires running MCP server with active screen capture target.

### 2. Multi-Compilation from Same Session

**Test:** Compile two grids from one session using different query params (e.g., first 5 frames vs last 5 frames).
**Expected:** Both grids produce different images, original frames remain on disk unchanged.
**Why human:** Requires an active session with frames to test non-destructive multi-compilation.

### 3. Label Overlay Visual Quality

**Test:** Compile a grid with `label: "Before Fix"` and inspect the result.
**Expected:** White text on semi-transparent black bar at top of grid, readable and properly positioned.
**Why human:** Visual appearance of SVG text overlay.

### 4. Retention Cleanup

**Test:** Create a session, manually adjust its startedAt to >24h ago, then trigger a list operation.
**Expected:** Session is automatically purged.
**Why human:** Requires time manipulation to test without waiting 24 hours.

### Gaps Summary

No gaps found. All 24 must-haves verified at code level. All 25 requirement IDs (D-01 through D-25) satisfied with implementation evidence. All key links wired. All data flows connected. No anti-patterns detected. 36/36 unit tests passing. No source type errors.

Four items require human verification: end-to-end capture pipeline, multi-compilation behavior, label overlay visual quality, and retention cleanup behavior.

---

_Verified: 2026-04-13T06:40:00Z_
_Verifier: Claude (gsd-verifier)_