Cross-Artifact Consistency Analysis
Feature: 002-youtube-design-preview
Analyzed: 2026-01-29
Artifacts: spec.md, plan.md, research.md, data-model.md, contracts/types.ts, tasks.md
Executive Summary
| Metric |
Value |
| Total Requirements (FR) |
20 |
| Total User Stories |
4 |
| Total Tasks |
50 |
| Requirements Covered |
20/20 (100%) |
| Constitution Alignment |
PASS |
| Critical Issues |
0 |
| Warnings |
3 |
| Suggestions |
4 |
Overall Status: Ready for implementation
Findings
| ID |
Category |
Severity |
Location |
Summary |
Recommendation |
| A-001 |
Underspecification |
Warning |
spec.md:FR-017 |
Weekly screenshot capture mechanism not detailed |
Add cron/scheduler details to plan.md or tasks.md |
| A-002 |
Inconsistency |
Warning |
tasks.md:T041 |
Script path uses .ts but may need to be executable |
Verify ts-node setup or use compiled JS for scheduler |
| A-003 |
Coverage Gap |
Warning |
tasks.md |
FR-009 (responsive breakpoints) only partially addressed by T043 |
Consider adding explicit breakpoint tests |
| A-004 |
Suggestion |
Info |
data-model.md |
publishedAt stored as Date but templates show "X days ago" |
Add utility function for relative time formatting |
| A-005 |
Suggestion |
Info |
contracts/types.ts |
VALIDATION_CONSTANTS.DURATION_REGEX allows single-digit minutes |
Consider stricter format ^\d{1,3}:\d{2}$ for edge cases |
| A-006 |
Suggestion |
Info |
research.md |
Sidebar dimensions (168x94) have different ratio than 16:9 |
Document this intentional deviation from standard 16:9 |
| A-007 |
Suggestion |
Info |
tasks.md |
T017 hover states may conflict with mobile (no hover on touch) |
Add note to disable hover states in mobile variant |
Requirement Coverage Matrix
| Requirement |
User Story |
Tasks |
Status |
| FR-001 (Desktop pixel-perfect) |
US1 |
T012-T020 |
Covered |
| FR-002 (Mobile pixel-perfect) |
US2 |
T021-T026 |
Covered |
| FR-003 (Sidebar pixel-perfect) |
US3 |
T027-T033 |
Covered |
| FR-004 (Real-time upload) |
US1-3 |
T010-T011 |
Covered |
| FR-005 (Metadata elements) |
US1-3 |
T012-T016, T020-T032 |
Covered |
| FR-006 (Typography) |
US1-3 |
T013-T014, T023, T029 |
Covered |
| FR-007 (Spacing/padding) |
US1-3 |
T018, T024, T031 |
Covered |
| FR-008 (Hover states) |
US1 |
T017 |
Covered |
| FR-009 (Responsive breakpoints) |
- |
T043 |
Partial |
| FR-010 (Playwright integration) |
US4 |
T034-T042 |
Covered |
| FR-011 (Visual diff reports) |
US4 |
T035 |
Covered |
| FR-012 (Customizable metadata) |
US1 |
T020 |
Covered |
| FR-013 (Duration badge) |
US1-3 |
T016 |
Covered |
| FR-014 (Channel avatar) |
US1-2 |
T015, T022, T032 |
Covered |
| FR-015 (Local storage) |
- |
T004, T006-T007, T047 |
Covered |
| FR-016 (Theme toggle) |
- |
T008, T019 |
Covered |
| FR-017 (Weekly capture) |
US4 |
T041 |
Covered |
| FR-018 (Historical screenshots) |
US4 |
T036 |
Covered |
| FR-019 (5MB limit) |
- |
T010-T011 |
Covered |
| FR-020 (Image formats) |
- |
T010-T011 |
Covered |
Constitution Alignment Check
| Principle |
Status |
Notes |
| I. Tech Stack |
PASS |
React 19.x, TS 5.x, Tailwind 4.x, shadcn/ui, Zustand - all aligned |
| II. Architecture |
PASS |
Feature code in frontend/src/, correct directory structure |
| III. Styling |
PASS |
YouTube CSS variables defined, Tailwind utilities used |
| IV. Data Management |
PASS |
Zustand for state, localStorage for persistence |
| V. Development Practices |
PASS |
TypeScript strict, ESLint, explicit types in contracts |
No constitution violations detected.
Duplication Analysis
| Area |
Finding |
| Type Definitions |
contracts/types.ts and data-model.md contain same interfaces - Acceptable (one is documentation, one is code) |
| CSS Values |
research.md and quickstart.md both list CSS values - Minor overlap, quickstart is intentional quick reference |
| Default Values |
data-model.md and contracts/types.ts both define defaults - Need to keep in sync |
Recommendation: Consider generating data-model.md from contracts/types.ts to prevent drift.
Ambiguity Detection
| Location |
Ambiguity |
Resolution |
| spec.md:FR-017 |
"Automated weekly capture" - when exactly? |
Suggest: Sunday 00:00 UTC, document in tasks.md |
| spec.md:SC-004 |
"90% of users" - how to measure in blind test? |
This is a qualitative metric, may be hard to automate |
| tasks.md:T036 |
"Copy reference screenshots" - from where? |
From specs/002-youtube-design-preview/reference/ (clarified in research.md) |
Task Dependency Analysis
Critical Path
Blocking Dependencies
| Task |
Blocked By |
Blocks |
| T006-T011 |
T001-T005 |
T012-T050 (all user stories) |
| T037-T040 |
T034-T036 |
None (test tasks) |
| T049 (lint) |
All implementation |
T050 (validation) |
Parallel Opportunities
- Phase 1: T001, T002, T003, T004 can all run in parallel
- Phase 2: T008, T009 can run in parallel after T006-T007
- Phase 3-5: US1, US2, US3 can be implemented in parallel by different developers
- Phase 6: T034, T035, T036 can run in parallel (test setup)
- Phase 7: T043, T044, T045, T046, T047 can all run in parallel
Risk Assessment
| Risk |
Likelihood |
Impact |
Mitigation |
| YouTube design changes during development |
Medium |
High |
Reference screenshots versioned, weekly updates |
| Visual test flakiness |
Medium |
Medium |
98% threshold allows minor variance |
| localStorage quota exceeded |
Low |
Medium |
T047 adds 10-thumbnail limit |
| Playwright MCP unavailable |
Low |
High |
Manual screenshot capture as fallback |
Recommendations
High Priority
- Clarify weekly capture schedule: Add specific timing (e.g., "Sundays at 00:00 UTC") to avoid ambiguity
- Add responsive test coverage: T043 covers responsive breakpoints but no visual tests for intermediate sizes
Medium Priority
- Consider relative time utility: Add
formatRelativeTime(date: Date): string to lib functions
- Document sidebar ratio: Note in research.md that sidebar uses slightly different aspect ratio
Low Priority
- Sync default values: Ensure
data-model.md defaults match contracts/types.ts
- Mobile hover handling: Explicitly disable hover states for mobile variant to avoid touch UX issues
Next Actions
- Address Warning items (A-001, A-002, A-003) before implementation begins
- Proceed with Phase 1 (Setup) - all tasks can run in parallel
- After Phase 2 completion, checkpoint to verify foundation before user stories
- Consider running US1-US3 in parallel if multiple developers available
Analysis complete. Feature is ready for implementation with minor clarifications recommended.
