Backend

This skill owns server-side implementation depth. Use it together with ../agentic-development/SKILL.md: agentic-development handles repo orientation, planning, and execution model; this skill handles APIs, services, schemas, persistence, and operational backend detail.

Start Here

1. Pair with ../agentic-development/SKILL.md for repo orientation, proof planning, and execution-mode selection.
2. Map the authoritative backend path before editing: endpoint, serializer/validator, service, job, model, schema, queue consumer, or migration owner.
3. Confirm contracts first: request/response shape, auth, persistence, failure modes, and observability.
4. Prefer extending an existing service/model/workflow over introducing a parallel abstraction.
5. If the change affects browser state, design systems, client routes, or interaction quality, route that slice into ../frontend/SKILL.md.

Core Rules