name: speckit-plan
description: Execute the implementation planning workflow using the plan template to generate design artifacts.

Spec Kit Plan Skill

When to Use

• The feature spec is ready and you need a technical implementation plan.

Inputs

• specs/<feature>/spec.md
• Repo context and .specify/ templates
• User-provided constraints or tech preferences (if any)

If the spec is missing, ask the user to run speckit-specify first.

Workflow

1. Setup: Run .specify/scripts/bash/setup-plan.sh --json from repo root and parse JSON for FEATURE_SPEC, IMPL_PLAN, SPECS_DIR, BRANCH. For single quotes in args like "I'm Groot", use escape syntax: e.g 'I'\''m Groot' (or double-quote if possible: "I'm Groot").

2. Load context: Read FEATURE_SPEC and .specify/memory/constitution.md. Load IMPL_PLAN template (already copied).

3. Execute plan workflow: Follow the structure in IMPL_PLAN template to:

4. Fill Technical Context (mark unknowns as "NEEDS CLARIFICATION")
5. Fill Constitution Check section from constitution
6. Evaluate gates (ERROR if violations unjustified)
7. Phase 0: Generate research.md (resolve all NEEDS CLARIFICATION)
8. Phase 1: Generate data-model.md, contracts/, quickstart.md
9. Phase 1: Update agent context by running the agent script

10. Re-evaluate Constitution Check post-design

11. Stop and report: Command ends after Phase 2 planning. Report branch, IMPL_PLAN path, and generated artifacts.

Phases

Phase 0: Outline & Research

1. Extract unknowns from Technical Context above:
2. For each NEEDS CLARIFICATION → research task
3. For each dependency → best practices task

4. For each integration → patterns task

5. Generate and dispatch research agents:

text For each unknown in Technical Context: Task: "Research {unknown} for {feature context}" For each technology choice: Task: "Find best practices for {tech} in {domain}"

1. Consolidate findings in research.md using format:
2. Decision: [what was chosen]
3. Rationale: [why chosen]
4. Alternatives considered: [what else evaluated]

Output: research.md with all NEEDS CLARIFICATION resolved

Phase 1: Design & Contracts

Prerequisites: research.md complete

1. Extract entities from feature spec → data-model.md:
2. Entity name, fields, relationships
3. Validation rules from requirements

4. State transitions if applicable

5. Generate API contracts from functional requirements:

6. For each user action → endpoint
7. Use standard REST/GraphQL patterns

8. Output OpenAPI/GraphQL schema to /contracts/

9. Agent context update:

10. Run .specify/scripts/bash/update-agent-context.sh <agent_type>
11. Use the current runtime agent type (e.g., claude, codex, copilot, gemini). Leave empty to update all existing agent files.
12. Update the appropriate agent-specific context file
13. Add only new technology from current plan
14. Preserve manual additions between markers

Output: data-model.md, /contracts/*, quickstart.md, agent-specific file

Key rules

• Use absolute paths
• ERROR on gate failures or unresolved clarifications

Outputs

• specs/<feature>/plan.md (filled implementation plan)
• specs/<feature>/research.md
• specs/<feature>/data-model.md
• specs/<feature>/contracts/ (API schemas)
• specs/<feature>/quickstart.md
• Updated agent context file (runtime-specific)

Next Steps

After planning:

• Generate tasks with speckit-tasks.
• Create a checklist with speckit-checklist when a quality gate is needed.