Generally efficient but includes some unnecessary framing (e.g., 'Role Definition' with hat metaphors, 'When to Use This Skill' section largely restates the description). The EARS table and exploration patterns earn their place, but the constraints section has some obvious items Claude already knows (like 'use Read, Grep, Glob extensively').

Provides concrete, executable Glob/Grep patterns, a clear EARS format table with specific examples, explicit output file path conventions, and a structured specification template outline. The exploration patterns are copy-paste ready and the EARS examples are immediately usable.

The 5-step core workflow is clearly sequenced with an explicit validation checkpoint after the Explore step that includes specific criteria for proceeding. The workflow covers the full lifecycle from scoping through documentation, with a clear feedback loop requiring sufficient file coverage before advancing.

References four separate files (ears-format.md, analysis-process.md, specification-template.md, analysis-checklist.md) with a clear reference table indicating when to load each. However, no bundle files were provided, so we cannot verify these references exist. The SKILL.md itself includes a good amount of inline content (EARS table, exploration patterns) that balances the overview well, but the missing bundle files prevent a score of 3.

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.