Spec Coding Skill

A spec-driven methodology for LLM agents to define, plan, and implement coding work with quality and consistency. Includes automatic task sizing — trivial fixes skip document ceremony, while complex features get the full structured flow.

When Activated

1. Read 00-agent-execution.md first — these are global rules that apply to every phase and take precedence over all other instructions
2. Check if .dev/blueprint.md exists (project already has requirements):
   • If yes: run the Session Bootstrap to present project status, then resume the active requirement
   • If no: proceed with the new requirement
3. Run Task Sizing — see 00-agent-execution.md § Task Sizing. Determines whether to:
   • XS/S: implement directly with minimal or no documents
   • M/L/XL: enter the standard Phase 01–07 flow
4. Start Phase 01 (if sized M+) — follow 01-initialization.md to create the requirement definition document
5. Work through phases in order — consult the reference file for each phase as you enter it

All generated documents go under .dev/[NNN]-[req-name]/ in the project root.

Blueprint Layer (above all phases)