/product-prd — Product Requirements Document

Write structured PRDs that define what to build and why. PRDs are product-focused — they describe the problem, users, and requirements without prescribing technical implementation.

When to Use

• User says "write a PRD", "product requirements", "feature spec"
• After a brainstorm session, to formalize requirements
• When a feature idea needs to be documented before building

Process

Step 1: Gather Context

Check for existing artifacts:

1. docs/brainstorms/ — Use brainstorm output as starting point
2. User-provided description or $ARGUMENTS
3. If neither exists, ask clarifying questions

Step 2: Clarify Requirements

Ask focused questions about gaps in the input:

• Scope: What's in v1 vs. later? What's explicitly out of scope?
• Users: Who are the primary and secondary users?
• Success: How will you measure if this works?
• Priority: Which requirements are must-have vs. nice-to-have?

Use AskUserQuestion — don't assume. Better to ask than to guess wrong.

Step 3: Write PRD

Write to docs/prds/YYYY-MM-DD-<name>.md using the template in references/prd-template.md.

Key sections:

1. Problem Statement — What problem exists and why it matters
2. Target Users — Specific user personas, not "all users"
3. User Stories — "As a [user], I want to [action] so that [benefit]"
4. Requirements — Categorized as Must/Should/Could (MoSCoW)
5. Success Metrics — Measurable outcomes
6. Out of Scope — Explicit boundaries

Step 4: Review with User

Present the PRD and use AskUserQuestion to confirm:

• Are the requirements complete?
• Is the priority (Must/Should/Could) correct?
• Anything missing or misunderstood?

Output

Save to: docs/prds/YYYY-MM-DD-<name>.md

Next Steps

• Ready for technical design? → /product-tech-spec
• Need to plan implementation? → /engineer-plan