Lists multiple specific concrete actions: map code dependencies, generate API documentation from source, identify undocumented business logic, create architecture documentation from implementation.

Clearly answers both 'what' (extracts specifications, maps dependencies, generates API docs, identifies business logic, creates architecture docs) and 'when' (legacy/undocumented systems, inherited projects, old codebases with no documentation) with explicit trigger phrases.

Excellent coverage of natural terms users would say: 'reverse engineer', 'old codebase', 'no docs', 'figure out how this works', 'inherited project', 'legacy analysis', 'code archaeology', 'undocumented features'. These are highly natural phrases a user would actually type.

Occupies a clear niche around reverse-engineering undocumented/legacy codebases. The trigger terms are highly specific to this use case and unlikely to conflict with general code analysis or documentation generation skills.

Generally efficient but includes some unnecessary sections like 'When to Use This Skill' (which restates the description) and the Role Definition section adds little actionable value. The EARS table and exploration patterns are well-condensed, but the constraints section has some obvious items ('don't make assumptions without evidence').

Provides concrete, executable Glob/Grep patterns, a clear EARS format table with specific examples, a defined output structure with file path convention, and explicit tool usage. The exploration patterns are copy-paste ready and the EARS examples are directly usable.

The 5-step core workflow is clearly sequenced with an explicit validation checkpoint after the Explore step that includes criteria for when to proceed vs. continue exploring. The workflow covers the full lifecycle from scoping through documentation with a flagging step for uncertainties.

The reference table clearly signals four separate reference files with contextual 'Load When' guidance, which is excellent structure. However, no bundle files were provided, so the referenced files (references/ears-format.md, references/analysis-process.md, etc.) cannot be verified to exist. The inline EARS table partially duplicates what would be in the reference, creating some redundancy.