go-error-handling

SKILL.md

In Go, errors are values - they are created by code and consumed by code. This skill covers how to return, structure, wrap, and handle errors effectively.

Use error to signal that a function can fail. By convention, error is the last result parameter.

Never return concrete error types from exported functions - a concrete nil pointer can become a non-nil interface value:

Comprehensive Go error handling patterns from Google and Uber style guides. Covers returning errors, wrapping with %w, sentinel errors, choosing error types, handling errors once, error flow structure, and logging. Use when writing Go code that creates, returns, wraps, or handles errors. Source: cxuu/golang-skills.

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