planner

name	planner
description	This skill should be used when the user asks to "plan a feature", "create feature plan", "start planning", "new feature", or wants comprehensive planning with analysis, spec, research, design, and TDD task breakdown.

Feature Planning Session

Create a comprehensive feature planning artifact for: $ARGUMENTS

This planning session follows the Feature Planning Methodology documented in aidocs/feature-planning-methodology.md.

Session Initialization

Step 1: Determine Feature ID

Run this command to find the next feature number:

{ ls backlog/plans/ 2>/dev/null; ls backlog/plans/_completed/ 2>/dev/null; } | grep -E '^[0-9]{3}' | sort -r | head -1

The Feature ID format is {NNN}-{slug} where:

• NNN = 3-digit sequential number (001, 002, 003...)
• slug = lowercase, hyphenated descriptor (2-4 words)

Step 2: Create Branch and Folder Structure

git checkout -b feature/{NNN}-{slug}
mkdir -p backlog/plans/{NNN}-{slug}/contracts

Note: When feature is complete, move folder to backlog/plans/_completed/{NNN}-{slug}/

Step 3: Create Planning Artifacts

Create all artifacts in sequence using templates from references/templates.md.

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Planning Phases

Phase 1: Analysis (analysis.md)

Goal: Understand the problem space, existing code, and patterns.

Key sections:

• Executive Summary with pattern/integration mapping
• Architecture Comparison (current vs target)
• Pattern Mapping from existing codebase
• What Exists vs What's Needed
• Key Insights (what works, gaps/limitations)

Phase 2: Specification (spec.md)

Goal: Define requirements from user perspectives.

Key sections:

• Problem Statement and Solution Summary
• User Stories with Acceptance Criteria
• Functional Requirements (FR-1, FR-2, etc.)
• Non-Functional Requirements (performance, security)
• Scope (in/out/future)
• Success Criteria, Assumptions, Risks

Phase 3: Research (research.md)

Goal: Validate design against external specifications, APIs, or standards.

Key sections:

• Conformance Analysis against external specs
• Gap identification
• Recommendations (critical, minor, future)

Phase 4: Design

Create three artifacts:

4a. Implementation Plan (plan.md)

• Architecture diagrams (ASCII)
• Component responsibilities
• File structure with MODIFY/NEW annotations
• Key design decisions with rationale
• Risk mitigation

4b. Data Model (data-model.md)

• Entity definitions with fields/types
• Relationships and invariants
• State transitions
• Validation rules

4c. Contracts (contracts/)

• Interface definitions
• API schemas
• Configuration schemas

Phase 5: Task Breakdown (tasks.md)

Organize tasks by phase with TDD workflow:

• [TEST] tasks: Write failing tests first
• [IMPL] tasks: Implement to pass tests

Include dependency diagram and task summary table.

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Session Workflow

Execution Order

1. Initialize: Determine Feature ID, create branch and folders
2. Phase 1: Create analysis.md - understand problem space
3. Phase 2: Create spec.md - define requirements
4. Phase 3: Create research.md - validate against external specs (if applicable)
5. Phase 4: Create plan.md, data-model.md, contracts/ - design
6. Phase 5: Create tasks.md - task breakdown
7. Cleanup: Remove the corresponding quick plan from backlog/plans/ (e.g., backlog/plans/YYYYMMDD-{slug}.md) since the full planning artifacts supersede it

Interactive Planning

As work progresses through each phase:

• Read relevant existing code to inform analysis
• Ask clarifying questions about requirements
• Research external APIs/specs as needed
• Validate design decisions with the user

Output Summary

After completing all phases, summarize:

Feature: {NNN}-{slug}
Branch: feature/{NNN}-{slug}

Created Artifacts:
├── backlog/plans/{NNN}-{slug}/
│   ├── analysis.md      ✅
│   ├── spec.md          ✅
│   ├── research.md      ✅
│   ├── plan.md          ✅
│   ├── data-model.md    ✅
│   ├── tasks.md         ✅
│   └── contracts/
│       └── README.md    ✅

Cleaned Up:
- Removed quick plan: backlog/plans/YYYYMMDD-{slug}.md  🗑️

Next Steps:
1. Review planning artifacts
2. Commit: git add backlog/plans/{NNN}-{slug} specs/tests/{NNN}-{slug}.md && git commit -m "feat: planning for {NNN}-{slug}"
3. Begin implementation: /work-plan {NNN}
4. When complete: mv backlog/plans/{NNN}-{slug} backlog/plans/_completed/

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Additional Resources

Reference Files

For detailed templates and guidance, consult:

• references/templates.md - Full templates for all planning artifacts

External References

• Feature Planning Methodology
• Developer Guide
• Example: 001-mcp-integration