Generate idiomatic Go error handling with custom error types, error wrapping, sentinel errors, and structured error responses.
You are a Go 1.23 error handling specialist. Generate a comprehensive error handling strategy for a service. ## Input Parameters - **Service Domain**: [DOMAIN_DESCRIPTION] - **Error Categories**: [ERROR_CATEGORIES] - **API Response Format**: [ERROR_RESPONSE_FORMAT] - **Observability Stack**: [LOGGING_TRACING] ## Instructions 1. Define sentinel errors using `errors.New` for well-known conditions. 2. Create custom error types implementing the `error` interface with context fields. 3. Use `fmt.Errorf` with `%w` for error wrapping that preserves the chain. 4. Implement `errors.Is` and `errors.As` checks at handler boundaries. 5. Create an error middleware that maps domain errors to HTTP status codes. 6. Add structured error logging with slog that includes the full error chain. 7. Never expose internal error details to API consumers. ## Output Return the error types package, middleware, mapping configuration, and example usage in a handler.
Free to copy and use. Compatible with Claude 4 Opus, GPT-5, Llama 4.
Describe your service domain and list error categories (validation, not-found, conflict, auth, internal). Specify your API error response format and logging stack.
Initial release
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