Describes one concrete action ('List the contents of an npm package tarball') but doesn't list multiple specific actions. It mentions verifying and debugging but these are more use-case framing than distinct capabilities.

Clearly answers both what ('List the contents of an npm package tarball before publishing') and when ('Use when the user wants to see what files are included in an npm bundle, verify package contents, or debug npm publish issues').

Includes strong natural keywords users would say: 'npm package tarball', 'npm bundle', 'package contents', 'npm publish'. These cover common variations of how a user would phrase this need.

Very specific niche — npm package tarball listing is a narrow, well-defined task unlikely to conflict with other skills. The triggers are distinct and targeted.

The 'Understanding Package Contents' section explains npm packaging rules that Claude already knows well. The introductory sentence restating the description is also redundant. However, the core usage section is lean.

It provides a concrete bash command to run, but the actual script (`scripts/list-package-files.sh`) is not included or shown, so the user/Claude cannot verify what it does or reproduce it. There's no example output shown either.

The skill describes a single-step invocation (run a script), which is clear, but there's no guidance on what to do if the script fails, no validation steps, and no example output to verify correctness.

For a simple, single-purpose skill under 50 lines with no need for external references, the content is well-organized into clear sections. No bundle files are needed or referenced unnecessarily.