Systematically set up new feature from planning through implementation structure.

List goals first: Capture and display feature goals at the outset for user alignment before any planning. Output a ## Goals section (3–7 bullets) summarizing scope, success criteria, and constraints. Confirm or adjust with user before proceeding.
Gather context: Matching glob rule and skill, then Read the topic MDX under apps/docu/content/docs/. Rules override skills.
Define requirements: Clarify scope, identify user stories/acceptance criteria, plan technical approach
Summarize assumptions: List 3–5 bullets before detailed planning
Create feature branch: Branch from main/develop, set up local dev, configure dependencies
Plan architecture: Design data models/APIs, plan UI components/flow, consider testing strategy, document requirements
Add diagrams: For architecture, data flow, or component relationships, generate Mermaid diagrams. Use flowchart (process flows), sequenceDiagram (API/request flows), classDiagram (structures), erDiagram (DB schemas), stateDiagram-v2 (lifecycles). Clear labels, subgraphs for grouping, wrap in mermaid code blocks. Split into multiple diagrams if complex.
Output structure: ## Goals first, then body, then ## References. List paths to each rule, skill, and MDX page used (plain paths, no @). Example: apps/docu/content/docs/architecture/api.mdx, .cursor/rules/backend/fastify.mdc, .agents/skills/fastify-v5.
Defer when uncertain: Ask questions when in doubt; defer to user for ambiguous, high-risk decisions

plan-feature