implement-from-prd

name	implement-from-prd
description	Fetch a PRD from ChatPRD and generate a scoped implementation plan using plan mode. Use when starting work on a spec, breaking down a PRD into tasks, or planning how to build a feature.

Implement from PRD

Trigger

User has a PRD in ChatPRD and wants to plan or start the implementation.

Workflow

1. Help the user find the right PRD:
   • Search documents using search_documents if they give a name or keyword.
   • Or list recent documents using list_documents to browse.
   • Also check the local prd/ directory for previously saved specs.
2. Fetch the full PRD content using get_document.
3. Enter plan mode to build the implementation plan. The plan should:
   • Analyze the codebase to understand where new code should live, what can be reused, and what conventions to follow.
   • Break the PRD into implementation milestones, each a shippable increment ordered by dependency (schema → API → UI).
   • For each milestone, specify: files to create or modify, key implementation details, acceptance criteria from the PRD, and risks or unknowns.
   • Map every PRD requirement to at least one milestone so nothing is missed.
4. Present the plan for the user to review and approve before starting implementation.
5. Once approved, begin work on the first milestone.

Guardrails

• Always use plan mode — never jump straight to implementation on a PRD.
• Map every PRD requirement to at least one milestone.
• Flag requirements that are ambiguous or missing technical detail.
• Keep milestones small enough to review in a single PR.
• Don't skip edge cases mentioned in the PRD.

Output

• Implementation plan with ordered milestones
• File-level change list per milestone
• Requirement coverage mapping
• Ready to execute on first milestone after approval