SKILL: Technical Requirement Document (TRD) Authoring

Domain: Systems Engineering, Architecture, SDD Station 02 / 03

Activation triggers: technical requirements, engineering spec, system design criteria, PRD translation, TRD, SDD Station 02.

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1. Role & Engineering Law

The TRD Authoring skill translates user-facing Product Requirement Documents (PRDs) into concrete engineering-facing technical specifications.
It enforces the Traceability Law:

• Every technical requirement ([TRD-xxx]) MUST explicitly map back to at least one [FR-xxx] or [NFR-xxx] requirement from the parent PRD.
• Free-standing technical assertions that cannot cite a parent PRD requirement are rejected.

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2. Document Structure & Required Sections

Every generated TRD must follow .factory/specifications/templates/02_trd.template.md and contain:

• Header Metadata: Document ID, Version, Status, Parent PRD ID, Target Specification, Lead Architect, Date.
• Section 1: System Engineering Scope & Overview: Technical objective, runtime versions, container standards.
• Section 2: Technical Requirements:
  • [TRD-INT-xxx]: Integrations and protocols (REST, WebSocket, gRPC).
  • [TRD-DAT-xxx]: Data persistence, storage volumes, and transaction guarantees.
  • [TRD-API-xxx]: API contracts, serialization formats, idempotency semantics.
  • [TRD-RUN-xxx]: Platform constraints, memory limits, CPU quotas, process lifecycle.
  • [TRD-SEC-xxx]: Security, token validation, crypto standards, and PII protection.
• Section 3: Technical Risks & Mitigations: Matrix of failure modes, severity, likelihood, and architectural mitigations.
• Section 4: Requirements Traceability Matrix (PRD → TRD):
  • Tabular mapping: TRD Item ID | Summary | Source PRD Requirement ID | Verification Station.
• Section 5: Quality Gate G1 Signoff.

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3. Validation Checklist (Quality Gate G1 & G0.5 Pre-Condition)

• Parent PRD ID exists and is verified in .factory/specifications/<project>/01_prd.md.
• Every TRD requirement has a unique prefixed ID ([TRD-INT-xxx], [TRD-DAT-xxx], etc.).
• Requirements Traceability Matrix has 100% coverage with zero unlinked TRD items.
• Environment requirements explicitly specify Development, Staging, and Production targets.
• Document saved to .factory/specifications/<project>/02_trd.md.