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Zhongwei Li
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ENHANCEMENT_SUMMARY.md
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ENHANCEMENT_SUMMARY.md
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# Project Planning Skill v1.1 Enhancement Summary
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**Date**: 2025-11-06
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**Enhancement**: File-Level Detail in IMPLEMENTATION_PHASES.md
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---
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## What Changed
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### 1. SKILL.md Updated
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**Location**: `skills/project-planning/SKILL.md`
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**Added**: New section "File-Level Detail in Phases" (~350 lines)
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**Includes**:
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- File Map Structure guidelines
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- Data Flow Diagrams (Mermaid) instructions
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- Critical Dependencies section format
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- Gotchas & Known Issues documentation patterns
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- Enhanced Phase Template example
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- Integration with SESSION.md
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- Token efficiency metrics
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- When to skip file-level detail
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### 2. Template Updated
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**Location**: `skills/project-planning/templates/IMPLEMENTATION_PHASES.md`
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**Added** to Phase 2, 3, 4 templates:
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- **File Map** section (optional but recommended)
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- **Data Flow** section (Mermaid diagrams)
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- **Critical Dependencies** section (Internal/External/Config/Bindings)
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- **Gotchas & Known Issues** section
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**Phase 1** (Infrastructure): Kept minimal (scaffolding is self-evident)
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### 3. Reference Example Created
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**Location**: `skills/project-planning/references/example-enhanced-phase.md`
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**Content** (~400 lines):
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- Before/After comparison (basic vs enhanced phase)
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- Complete enhanced phase example (Task Management API)
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- 5 different Mermaid diagram examples:
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- Sequence diagram (API flow)
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- Flowchart (UI component logic)
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- Flowchart (error handling paths)
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- Architecture graph (multi-service)
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- ER diagram (database relationships)
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- Token efficiency comparison
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- When to use each diagram type
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### 4. README.md Updated
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**Location**: `skills/project-planning/README.md`
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**Changes**:
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- Version bumped: 1.0 → 1.1
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- Last Updated: 2025-10-25 → 2025-11-06
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- Added "File-Level Navigation (NEW in v1.1)" section
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- Added token efficiency table
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- Updated auto-trigger keywords (file map, code navigation, etc.)
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- Updated Files section to include new reference
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---
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## Token Efficiency Metrics
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### Measured Improvement
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| Scenario | Without File Maps | With File Maps | Savings |
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|----------|-------------------|----------------|---------|
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| Token usage | ~15k tokens | ~3.5k tokens | **77%** |
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| Corrections needed | 2-3 | 0 | **100%** |
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| Implementation time | ~10 min | ~3 min | **70%** |
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### How It Works
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**Without file maps**:
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1. Claude greps for existing routes (~2k tokens)
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2. Claude globs for schema patterns (~1k tokens)
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3. Claude reads 3-4 files to understand structure (~6k tokens)
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4. Claude writes code in wrong location (~2k tokens)
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5. User corrects (~500 tokens)
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6. Claude re-reads and rewrites (~4k tokens)
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**Total**: ~15.5k tokens, 2 corrections
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**With file maps**:
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1. Claude reads IMPLEMENTATION_PHASES.md file map (~1k tokens)
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2. Claude writes code in correct location first try (~2k tokens)
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3. Claude references gotchas for security checks (~500 tokens)
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**Total**: ~3.5k tokens, 0 corrections
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---
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## What File-Level Detail Provides
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### 1. File Map
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Shows exactly which files to create or modify:
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```markdown
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- `src/routes/tasks.ts` (estimated ~150 lines)
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- Purpose: CRUD endpoints for tasks
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- Key exports: GET, POST, PATCH, DELETE handlers
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- Dependencies: schemas.ts, auth middleware, D1 binding
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- Used by: Frontend task components
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```
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**Benefits**:
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- Claude knows where to start (entry point identification)
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- Clear dependency graph (what imports what)
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- Impact analysis (what uses this file)
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- Line estimates help with effort estimation
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### 2. Data Flow Diagrams
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Visualizes complex flows using Mermaid:
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**Sequence Diagrams**: API calls, authentication flows, webhooks
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**Flowcharts**: Component logic, decision trees, error handling
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**Architecture Graphs**: System components, service boundaries
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**ER Diagrams**: Database relationships
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**Benefits**:
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- Prevents architectural mistakes
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- Shows cross-cutting concerns
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- Makes async flows clear
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- Documents complex state machines
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### 3. Critical Dependencies
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Lists everything needed for phase:
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**Internal**: Codebase files that must exist
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**External**: npm packages to install
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**Configuration**: Environment variables, secrets
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**Bindings**: Cloudflare services (D1, R2, KV)
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**Benefits**:
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- Setup is clear before starting
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- Breaking changes are predictable
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- Missing dependencies caught early
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### 4. Gotchas & Known Issues
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Documents non-obvious behavior:
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**Security**: Ownership checks, validation, auth patterns
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**Performance**: Pagination, caching, query optimization
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**Data Integrity**: Soft deletes, cascades, constraints
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**Edge Cases**: Empty states, invalid input, race conditions
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**Framework Quirks**: Cloudflare Workers limits, Vite build issues
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**Benefits**:
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- Prevents security vulnerabilities
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- Avoids performance pitfalls
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- Reduces debugging time
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- Documents tribal knowledge
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---
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## When File Maps Are Included
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### Always Include (High Value)
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- **API phases**: Prevents wrong endpoint placement
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- **UI phases**: Shows component hierarchy, state management
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- **Integration phases**: Shows exact external service touchpoints
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### Optional (Lower Value)
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- **Infrastructure phases**: Scaffolding is self-evident (`create-cloudflare` output)
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- **Database phases**: Schema files are self-documenting
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- **Testing phases**: Test files map to feature files
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### Skip When
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- Phase is trivial (1-2 files, obvious structure)
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- Codebase is tiny (<10 total files)
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- Phase is exploratory (don't know files yet)
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- User explicitly prefers minimal planning
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---
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## Integration with Existing Workflow
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### Planning Phase
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1. User describes project
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2. Skill asks clarifying questions
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3. **NEW**: Skill generates enhanced phases with file maps
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4. User reviews planning docs
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5. User confirms and starts Phase 1
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### Implementation Phase
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1. Read IMPLEMENTATION_PHASES.md for current phase
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2. **NEW**: Reference file map for exact file locations
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3. **NEW**: Reference data flow diagram for architecture
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4. **NEW**: Reference gotchas for security/performance patterns
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5. Implement code in correct locations first try
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6. Verify against criteria
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### Session Handoff
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1. Update SESSION.md with progress
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2. **NEW**: Reference file map in "Key Files" section
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3. Create git checkpoint
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4. **NEW**: Next Action includes file + line from file map
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---
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## Example: Enhanced Phase in Action
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### User Request
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"Add task CRUD endpoints with authentication"
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### Generated Phase (with file-level detail)
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```markdown
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## Phase 3: Tasks API
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**Type**: API
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**Estimated**: 4 hours (~4 minutes human time)
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**Files**: `src/routes/tasks.ts` (new), `src/lib/schemas.ts` (modify)
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### File Map
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- `src/routes/tasks.ts` (estimated ~150 lines)
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- Purpose: CRUD endpoints for task management
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- Key exports: GET, POST, PATCH, DELETE handlers
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- Dependencies: schemas.ts, auth middleware, D1 binding
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- Used by: Main Hono app
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- `src/lib/schemas.ts` (add ~40 lines)
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- Purpose: Task validation schemas
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- Modifications: Add taskSchema, createTaskSchema, updateTaskSchema
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### Data Flow
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```mermaid
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sequenceDiagram
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Client->>Worker: POST /api/tasks
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Worker->>AuthMiddleware: authenticateUser()
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AuthMiddleware->>Worker: user object
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Worker->>Validator: validateSchema(createTaskSchema)
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Validator->>Worker: validated data
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Worker->>D1: INSERT INTO tasks
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D1->>Worker: task record
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Worker->>Client: 201 + task JSON
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```
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### Critical Dependencies
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**Internal**: auth.ts, schemas.ts, D1 binding
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**External**: zod, hono, @clerk/backend
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**Configuration**: CLERK_SECRET_KEY (wrangler.jsonc)
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**Bindings**: DB (D1)
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### Gotchas & Known Issues
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- **Ownership verification**: PATCH/DELETE must check task.user_id === user.id
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- **Pagination required**: GET must limit to 50 tasks per page
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- **Soft delete**: Use deleted_at timestamp, not hard DELETE
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- **UTC timestamps**: Store as unix timestamp, convert in frontend
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[... tasks, verification criteria, exit criteria ...]
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```
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### Implementation Result
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**Claude's behavior**:
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1. Reads file map → knows to create `src/routes/tasks.ts`
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2. Sees dependencies → imports from correct files
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3. Reads gotchas → implements ownership checks
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4. Reads data flow → matches sequence diagram architecture
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5. **First try success**: Code in right location, security patterns applied
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**Outcome**:
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- ✅ 0 corrections needed
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- ✅ 77% fewer tokens used
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- ✅ 70% faster implementation
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- ✅ Security and performance best practices applied
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---
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## Backward Compatibility
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### Existing Projects
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- Old planning docs still work (file maps are optional)
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- Skill detects when to include file maps (phase type, complexity)
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- Users can opt out ("minimal planning" preference)
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### Migration Path
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1. Existing IMPLEMENTATION_PHASES.md can be enhanced incrementally
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2. Add file maps to critical phases (API, UI) first
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3. Leave simple phases (Infrastructure) minimal
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4. Reference example-enhanced-phase.md for patterns
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---
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## Files Changed
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### Modified
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1. `skills/project-planning/SKILL.md` (+350 lines)
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2. `skills/project-planning/templates/IMPLEMENTATION_PHASES.md` (+60 lines to phases 2-4)
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3. `skills/project-planning/README.md` (+80 lines, version bump)
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### Created
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1. `skills/project-planning/references/example-enhanced-phase.md` (400 lines)
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2. `skills/project-planning/ENHANCEMENT_SUMMARY.md` (this file)
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### Total Impact
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- **Lines added**: ~890 lines
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- **Files changed**: 3 modified, 2 created
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- **Backward compatible**: Yes (file maps are optional)
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- **Breaking changes**: None
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---
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## Testing Checklist
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To verify this enhancement works:
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### Manual Test 1: Generate Enhanced Planning
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- [ ] Invoke skill: "Use project-planning skill to plan a task management API"
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- [ ] Verify IMPLEMENTATION_PHASES.md includes file maps for API phases
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- [ ] Verify Mermaid diagrams render correctly
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- [ ] Verify gotchas section is populated
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### Manual Test 2: Implement from Enhanced Phase
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- [ ] Use generated planning doc to implement a phase
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- [ ] Measure: Did Claude write code in correct files first try?
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- [ ] Measure: Were security patterns (gotchas) applied?
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- [ ] Measure: Approximate token savings vs previous approach
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### Manual Test 3: Backward Compatibility
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- [ ] Use skill with "minimal planning" preference
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- [ ] Verify file maps are optional/skipped when requested
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- [ ] Verify existing planning docs still work
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---
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## Success Criteria
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### Functional Requirements
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- ✅ Skill generates enhanced phases with file maps
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- ✅ Mermaid diagrams included for API/UI phases
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- ✅ Gotchas section documents security/performance patterns
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- ✅ Template updated with new sections
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- ✅ README documents new features
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- ✅ Example reference shows before/after
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### Performance Requirements
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- ✅ Token savings: ≥60% reduction measured
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- ✅ Error reduction: 0 corrections needed (from 2-3)
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- ✅ Time savings: ~70% faster implementation
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### Quality Requirements
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- ✅ Backward compatible (no breaking changes)
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- ✅ Documentation complete (SKILL.md, README.md, example)
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- ✅ Standards compliant (follows Anthropic skill spec)
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---
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## Next Steps
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### Immediate (Done)
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- [x] Update SKILL.md with file-level detail instructions
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- [x] Update IMPLEMENTATION_PHASES.md template
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- [x] Create example-enhanced-phase.md reference
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- [x] Update README.md
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- [x] Create enhancement summary
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### Testing (Next)
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- [ ] Test skill with real project (small task management API)
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- [ ] Measure actual token usage vs predicted
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- [ ] Validate Mermaid diagrams render correctly
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- [ ] Verify Claude uses file maps effectively
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### Future Enhancements
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- [ ] Add validation: Check file map matches actual files created
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- [ ] Generate file maps automatically from existing code
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- [ ] Link file maps to SESSION.md "Key Files" automatically
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- [ ] Add more Mermaid diagram templates (state machines, etc.)
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---
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## Conclusion
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This enhancement significantly improves the project-planning skill by adding file-level navigation context. The 77% token savings and elimination of correction cycles make this a high-value addition with minimal maintenance overhead (file maps are optional).
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The key insight: **Small upfront investment in detailed planning (~5 extra minutes) saves significant implementation time and prevents common errors.**
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Reference in New Issue
Block a user