error-handling
Error Handling Patterns
Consistent, robust error handling patterns for production applications.
When to Activate
- Designing error types or exception hierarchies for a new module or service
- Adding retry logic or circuit breakers for unreliable external dependencies
- Reviewing API endpoints for missing error handling
- Implementing user-facing error messages and feedback
- Debugging cascading failures or silent error swallowing
Core Principles
- Fail fast and loudly — surface errors at the boundary where they occur; don't bury them
- Typed errors over string messages — errors are first-class values with structure
- User messages ≠ developer messages — show friendly text to users, log full context server-side
- Never swallow errors silently — every
catchblock must either handle, re-throw, or log - Errors are part of your API contract — document every error code a client may receive
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