Doc Prd

doc-prd

Purpose

Create a Product Requirements Document (PRD) — Layer 2 of the SDD flow. A PRD defines product features, personas, success metrics, and acceptance criteria at the C4 Container level (what the product does, not how).

Layer: 2 (Container level). Upstream: BRD. Downstream: EARS → BDD → ADR → SPEC → TDD → IPLAN → Code.

One PRD per BRD iteration cycle (MVP → PROD → new MVP). New scope gets a new PRD; link cycles with @depends: PRD-NN.

When to Use

Use doc-prd when:

• A BRD exists and you need to define product features and user requirements.
• Translating business needs into product capabilities, personas, and KPIs.
• Elaborating BRD §8 architecture topics into technical options for ADR.

For end-to-end generation from a BRD, a prompt, or an IPLAN, use ../doc-prd-autopilot/SKILL.md.

Prerequisites

PRD requires an upstream BRD. Before writing, read:

1. Upstream BRD — the BRD that drives this PRD. If it is split into section files (docs/01_BRD/BRD-NN_{slug}/), read all files as one logical document.
2. Template (source of truth): ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/PRD-TEMPLATE.yaml
3. Layer README: ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/README.md
4. ID & tag standards: ${CLAUDE_PLUGIN_ROOT}/framework/governance/ID_NAMING_STANDARDS.md
5. Authoring style: ${CLAUDE_PLUGIN_ROOT}/framework/governance/AUTHORING_STYLE.md

Confirm no ID collision: ls docs/02_PRD/ 2>/dev/null. Reference only BRD elements that exist; never invent placeholders like BRD-XXX or TBD. The PRD ID need not match the BRD ID (PRD-09 may implement BRD-16).

Layer Guidance

Content boundaries (decide what belongs here)

PRD is the Container level. Keep product capabilities, user journeys, and error handling; push everything else downstream.

Required structure (15 sections)

document_control comes first (product name, version, status, dates, author/reviewer/approver, @brd: reference, EARS-Ready score, revision history). Then:

2. Executive Summary (incl. MVP hypothesis) · 3. Problem Statement ·
3. Target Audience & User Personas · 5. Success Metrics & KPIs ·
4. Goals & Objectives · 7. Scope & Requirements · 8. User Stories & User Roles ·
5. Functional Requirements (incl. user journey + diagram contract) ·
6. Customer-Facing Content & Messaging · 11. Acceptance Criteria ·
7. Constraints & Assumptions · 13. Risk Assessment · 14. Traceability (incl. ADR topic elaboration) · 15. Glossary.

See PRD-TEMPLATE.yaml for per-section content and embedded _guidance.

Section 8 — User Stories (layer separation, mandatory note)

Hold role definitions and story summaries (As a [role], I want [capability] so that [benefit]) with product-level acceptance criteria only. Include the note: detailed behaviors live in EARS; executable scenarios live in BDD. Do not write WHEN-THE-SHALL or Given-When-Then here.

Section 10 — Customer-Facing Content (mandatory, blocking)

Must carry substantive content in at least 3 categories: product positioning, key messaging, feature descriptions, documentation, help text, error messages, success confirmations, onboarding, release notes. Placeholder-only content is a blocking error.

Section 14 — ADR topic elaboration

Elaborate BRD §8 topics with technical options and evaluation criteria. Layer separation: BRD = what & why · PRD = how to evaluate · ADR = the decision. Do not reference ADR numbers — ADRs do not exist yet.

Element IDs and tags

• Hierarchical element IDs: PRD.{doc_id}.{section_id}.{hash} (e.g. PRD.01.09.b3f2). Emit a stable 4-hex-char identifier per element, distinct within its section (HASH01); extend to 8 on collision. Do not compute SHA-256 in this prompt — the hash form is the canonicalization TARGET produced by a deterministic tool pass, and byte-exact field extraction is defined for BRD §7 only (Phase 2+ for PRD). Authority: framework/governance/ID_NAMING_STANDARDS.md. SS is the section the element lives in — no numeric type-codes.
• PRD is Layer 2, so it carries @brd: tags (e.g. @brd: BRD.01.07.a7f3). Downstream artifacts tag it: @prd: PRD.01.09.b3f2.
• Removed patterns (do not use): FR-XXX, US-XXX, AC-XXX, F-XXX, and the legacy 3-segment PRD.NN.xxxx.
• Quantitative values that may change use @threshold: PRD.NN.{category}.{key} (categories: quota, risk, perf, timeout, rate).

Creation Process

1. Read the parent BRD — all section files as one document; extract objectives, stakeholders, success criteria, and §8 topics.
2. Reserve ID — next free PRD-NN (two digits: PRD-01, PRD-99, PRD-102). Per-layer independence (CLEANUP-PR-F item 18): pick the next-free number in YOUR layer's index — the upstream's number is NOT your number (doc numbers are per-layer sequential and independent; see framework/governance/ID_NAMING_STANDARDS.md §Cross-layer cardinality).
3. Create the nested folder — every PRD lives in docs/02_PRD/PRD-NN_{slug}/ regardless of size. Monolithic: PRD-NN_{slug}.md inside it; section-based (>25 KB): PRD-NN.S_{section}.md
   • index from ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/PRD-00_index.TEMPLATE.md.
4. Document Control first, then complete all 15 sections from the template.
5. Fill §10 (≥3 customer-facing categories); elaborate §14 ADR topics without ADR numbers.
6. Add @brd: tags resolving to existing BRD elements.
7. Update the PRD index docs/02_PRD/PRD-00_index.md and add this PRD to the parent BRD's Downstream Artifacts in the same change.
8. Validate (below) and commit the PRD, index, and BRD update together.

Validation

This skill is the validator (no runtime code). Apply against ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/README.md and ${CLAUDE_PLUGIN_ROOT}/framework/governance/ID_NAMING_STANDARDS.md.

• Document Control is the first section, with @brd: reference and EARS-Ready score.
• All 15 sections present and non-empty.
• §10 has substantive content in ≥3 categories (not placeholders).
• §8 holds PRD-level summaries only, with the layer-separation note.
• §14 elaborates ADR topics; no ADR numbers referenced.
• Element IDs match PRD.NN.SS.xxxx; SS equals the host section; no removed patterns.
• @brd: tags resolve to existing BRD elements.
• Traceability / index updated; parent BRD updated; no broken links.
• Diagram contract: @diagram: c4-l2 and @diagram: dfd-l2 present (use ../charts-flow/SKILL.md); sequence diagrams include alt/else.

Quality gate (blocking): EARS-Ready score ≥ 90/100 before moving on. If issues are found, fix and re-check; if unfixable, log for manual review.

Next Skill

../doc-ears/SKILL.md — the EARS references this PRD (@prd: PRD.NN.SS.xxxx) and formalizes PRD features into WHEN-THE-SHALL-WITHIN requirements. (Per the necessary-upstream contract, EARS itself only requires @prd; upstream BRD lineage is reachable transitively via the @-tag chain.)

Adaptation

Read .aidoc/profile.yaml; honor only this skill's knobs (section_toggles, glossary). Ignore unknown keys; absent a profile, use framework defaults. Authority: ${CLAUDE_PLUGIN_ROOT}/framework/governance/ADAPTATION.md.

Related Resources

• Template / authoring rules: ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/PRD-TEMPLATE.yaml
• Layer README: ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/README.md
• Index template: ${CLAUDE_PLUGIN_ROOT}/framework/layers/02_PRD/PRD-00_index.TEMPLATE.md
• ID & tag standards: ${CLAUDE_PLUGIN_ROOT}/framework/governance/ID_NAMING_STANDARDS.md
• Upstream BRD: ../doc-brd/SKILL.md
• Quality gate: ../doc-prd-audit/SKILL.md · Fixes: ../doc-prd-fixer/SKILL.md
• Generation pipeline: ../doc-prd-autopilot/SKILL.md

Quick Reference