Lists multiple specific concrete actions and concepts: error builders, stack traces, error codes, error context, error wrapping, error attributes, user-facing vs developer messages, panic recovery, and logger integration.

Clearly answers both 'what' (structured error handling with samber/oops including specific features) and 'when' ('Apply when using or adopting samber/oops, or when the codebase already imports github.com/samber/oops').

Includes highly natural and specific trigger terms users would use: 'samber/oops', 'error handling', 'Golang', 'stack traces', 'error codes', 'error wrapping', 'panic recovery', and the import path 'github.com/samber/oops'. These cover both library-specific and general Go error handling terminology.

Highly distinctive due to the specific library reference (samber/oops) and the Go language context. Unlikely to conflict with generic error handling skills or other language-specific skills. The import path further narrows the trigger scope.

The 'Why use samber/oops' section explains concepts that are somewhat redundant with the opening paragraph and includes motivational content Claude doesn't need. The builder methods table is useful but the overall content could be tightened — e.g., the 'unnecessary nil check' example and some explanatory prose could be trimmed. However, most content earns its place.

The skill provides fully executable Go code examples across multiple layers (repository, handler, service), concrete builder chain patterns, do/don't comparisons, and specific API method references. All code is copy-paste ready and covers real-world scenarios.

The skill clearly sequences how errors should flow through architectural layers (repository → service → handler), shows context propagation via middleware, and provides explicit patterns for each layer. The 'Add context at each layer' section with Controller→Service→Repository is an excellent workflow demonstration. Since this is primarily a pattern/API skill rather than a destructive batch operation, validation checkpoints are less critical.

The skill provides a clear overview with well-organized sections, a comprehensive builder methods table for quick reference, and appropriately defers advanced patterns (assertions, configuration, logger examples) to a separate './references/advanced.md' file. Cross-references to related skills are clearly signaled and one level deep.