Four-phase gated workflow for feature planning (Brief→Plan→Tasks→Implement)
Canonical: docs/skills/plan-feature.md | Claude Code implementation
Four-phase gated structure. No phase begins until the previous is validated by the user.
No code generation in this phase.
docs/specs/Output: docs/specs/<feature>/design.md draft
Output: docs/specs/<feature>/tasks.md
Every task prompt must contain all three dimensions: