PRD Implementation Planning

Purpose

Transform approved PRD requirements into actionable implementation tasks with:

• Skill mappings for each task
• Dependency ordering and priority
• Effort estimates
• Progress tracking framework with date/commit tracking

When NOT to Use This Skill

• PRD is not yet approved (use prd-reviewing first)
• Need full technical architecture (use sparc-planning after this)
• Simple features not requiring planning
• No PRD exists (use prd-writing first)

Workflow

Step 1: Invoke check-history

Gather project context and understand existing patterns.

Step 2: Read and Analyze PRD

1. Read the complete PRD document
2. Extract all user stories (US-1, US-2, etc.)
3. Identify technical domains involved:
   • Database/Entities (Vendure, TypeORM)
   • API (GraphQL, REST)
   • UI (Admin UI, Mantine)
   • Testing (Playwright, unit tests)
   • Infrastructure (Helm, K8s)
   • Documentation

Step 3: Map User Stories to Tasks

For each user story:

1. Break into implementation tasks

   • One task per logical unit of work
   • Tasks should be completable in 1-8 hours

2. Assign primary skill

   • Reference the Skill Mapping in REFERENCE.md
   • Choose the most specific skill available

3. Estimate effort

   • XS: < 1 hour
   • S: 1-2 hours
   • M: 2-4 hours
   • L: 4-8 hours
   • XL: 8+ hours (should be broken down)

4. Identify dependencies

   • Which tasks must complete first?
   • Use task numbers (e.g., "Task 1, Task 2")

5. Set priority

   • P0: Critical path, blocks other work
   • P1: High priority, needed for feature completion
   • P2: Nice to have, can be deferred

Step 4: Generate Skill Requirements Table

Summarize all skills needed:

### Skill Requirements

| Domain   | Skills Required           | Purpose                  |
| -------- | ------------------------- | ------------------------ |
| Database | `vendure-entity-writing`  | Define data models       |
| API      | `vendure-graphql-writing` | Create GraphQL endpoints |
| UI       | `mantine-developing`      | Build components         |
| Testing  | `playwright-writing`      | E2E test coverage        |

Step 5: Generate Implementation Tasks Table

### Implementation Tasks

| #   | Task                       | User Story | Skill                     | Priority | Dependencies | Est. |
| --- | -------------------------- | ---------- | ------------------------- | -------- | ------------ | ---- |
| 1   | Create Order entity        | US-1       | `vendure-entity-writing`  | P0       | None         | M    |
| 2   | Add createOrder mutation   | US-1       | `vendure-graphql-writing` | P0       | 1            | L    |
| 3   | Build order form UI        | US-2       | `mantine-developing`      | P1       | 2            | L    |
| 4   | Write order flow E2E tests | US-1,2     | `playwright-writing`      | P1       | 3            | M    |

Step 6: Initialize Progress Tracker

## Implementation Progress

| #   | Task                       | Status  | Started | Completed | Commit |
| --- | -------------------------- | ------- | ------- | --------- | ------ |
| 1   | Create Order entity        | Pending | -       | -         | -      |
| 2   | Add createOrder mutation   | Pending | -       | -         | -      |
| 3   | Build order form UI        | Pending | -       | -         | -      |
| 4   | Write order flow E2E tests | Pending | -       | -         | -      |

### Progress Summary

- **Total Tasks:** 4
- **Completed:** 0 (0%)
- **In Progress:** 0
- **Blocked:** 0
- **Pending:** 4
- **Last Updated:** YYYY-MM-DD

Step 7: Append to PRD Document

Add the Implementation Plan and Progress sections to the PRD document after the existing content (after Timeline & Milestones if present).

Status Values

Updating Progress

When a task is completed:

1. Update status to Done
2. Fill in Completed date (YYYY-MM-DD)
3. Add commit hash (short form, e.g., abc1234)
4. Update Progress Summary counts

Commit Message Pattern: Include [PRD Task N] in commit message for auto-tracking:

feat(orders): add createOrder mutation [PRD Task 2]

Integration with Other Skills

Invokes:

• check-history - Gather context first

Invoked After:

• prd-reviewing - PRD must be approved

Works With:

• sparc-planning - For complex tasks needing architecture
• safe-commit - Auto-updates progress on task completion

Updates:

• PRD document with Implementation Plan sections

Example: E-commerce Shipping Feature

Given PRD with:

• US-1: Calculate shipping rates
• US-2: Display rate options
• US-3: Track shipments

Generated Implementation Plan:

Skill Requirements

Implementation Tasks

Anti-Patterns to Avoid

1. Tasks too large - Break XL tasks into smaller pieces
2. Missing skills - Every task needs a skill mapping
3. Circular dependencies - Tasks can't depend on each other
4. Vague tasks - Be specific about what's being built
5. Skipping estimates - Every task needs effort estimate
6. Ignoring priority - P0 tasks should be minimal critical path

Resources

• REFERENCE.md - Complete skill mapping by domain
• TEMPLATE.md - Copy-paste templates for sections

For comprehensive specification guidance, use the specification-architect agent.