Use when designing REST API endpoints, URL structure, HTTP methods, status codes, request/response formats, pagination, SSE streaming, or OpenAPI docs in Axum.
Use when creating modules, organizing project structure, designing layered architecture (handler/service/domain/repo), dependency injection, or DDD patterns in Rust.
Use when designing PostgreSQL schemas, writing SQLx migrations, choosing data types, naming tables/columns/indexes, or writing compile-time checked queries.
Use when implementing error types, designing error hierarchies, mapping errors to HTTP responses, or reviewing error handling patterns in Rust code using thiserror and anyhow.
Use when setting up tracing, configuring log levels, writing structured logs, using spans and instrument, or handling sensitive data in Rust logs.
Use when writing unit/integration tests, setting up test infrastructure, mocking with wiremock/mockall, or designing test structure in Rust.