Create TechSpec

Translate business requirements into a detailed technical specification.

Required Inputs

• Feature name identifying the tasks/prd-<name>/ directory.
• Optional: existing _prd.md as primary input.
• Optional: existing _techspec.md for update mode.

Workflow

1. Gather context.

   • Check for _prd.md in tasks/prd-<name>/. If it exists, read it as the primary input.
   • If no PRD exists, ask the user for a description of what needs technical specification.
   • Read existing ADRs from tasks/prd-<name>/adrs/ to understand decisions already made during PRD creation.
   • Create tasks/prd-<name>/adrs/ directory if it does not exist.
   • Spawn an Agent tool call to explore the codebase for architecture patterns, existing components, dependencies, and technology stack.
   • If _techspec.md already exists, read it and operate in update mode.

2. Ask technical clarification questions.

   • Focus on HOW to implement, WHERE components live, and WHICH technologies to use.
   • Cover architecture approach and component boundaries.
   • Cover data models and storage choices.
   • Cover API design and integration points.
   • Cover testing strategy and performance requirements.
   • Ask at most 3 questions per round and wait for answers before the next round.

3. Present the design proposal for approval.

   • System architecture overview with component relationships.
   • Key interfaces and data models.
   • Implementation sequencing with dependencies.
   • Trade-offs considered and risks identified.
   • Wait for user approval before writing the document.
   • If the user requests changes, revise and present again.
   • After the user approves the design, create an ADR for each significant technical decision (architecture pattern chosen, technology selected, data model approach, etc.):
     • Read references/adr-template.md.
     • Determine the next ADR number by listing existing files in tasks/prd-<name>/adrs/.
     • Fill the template: the chosen design as "Decision", rejected alternatives as "Alternatives Considered", and trade-offs as "Consequences". Set Status to "Accepted" and Date to today.
     • Write each ADR to tasks/prd-<name>/adrs/adr-NNN.md (zero-padded 3-digit sequential number).

4. Generate the TechSpec document.

   • Read references/techspec-template.md and fill every applicable section.
   • Include an "Architecture Decision Records" section listing all ADRs (from both PRD brainstorming and technical design) with their numbers, titles, and one-line summaries as links to the adrs/ directory.
   • Write the completed document to tasks/prd-<name>/_techspec.md.
   • Every PRD goal and user story should map to a technical component.
   • Reference PRD sections by name but do not duplicate business context.
   • Include code examples only for core interfaces, limited to 20 lines each.

Error Handling

• If the PRD is missing, proceed with user-provided context and note the absence in the Executive Summary.
• If codebase exploration reveals conflicting architectural patterns, document both and recommend one with rationale.
• If the user rejects the design proposal, incorporate all feedback and present a revised proposal.
• If the target directory does not exist, create it.
• If operating in update mode, preserve sections the user has not asked to change.