Backend craft skill for language-agnostic CLIs, REST APIs, gRPC services, package APIs, and backend repo structure. Use when building, auditing, reshaping, or studying backend surfaces: command trees, HTTP/gRPC contracts, error envelopes, config precedence, operability hooks, package boundaries, dead code, shared-package shape, and agent/script-friendly tools. Not for browser UI, ORM schema design, business domain modeling, Kubernetes/Terraform, or frontend design.
2026-05-29