The content is lean and well-structured. The type table, rules, and examples all earn their place. There's no unnecessary explanation of what commits are or how git works — it assumes Claude's competence and focuses on the specific conventions.

Provides a concrete format template, specific rules (imperative mood, 70 char limit, 72 char wrap), complete examples covering multiple scenarios (security fix, new feature, breaking change), and a common mistakes table with fixes. Fully actionable without ambiguity.

For a single-task skill (writing commit messages), the workflow is unambiguous: format template → subject rules → body guidelines → footer conventions. The sequential structure naturally guides the process, and the common mistakes table serves as a validation checklist.

For a self-contained skill under 100 lines with no need for external references, the content is well-organized with clear sections (format, types, subject rules, body guidelines, footer, examples, common mistakes). No bundle files are needed and none are referenced unnecessarily.

Names the domain (Ruby/Rails commits) and some actions (commit message structure, type selection, body content), but doesn't list multiple concrete discrete actions — it's more of a general guidance description than a list of specific capabilities.

Explicitly answers both 'what' (guides commit message structure, type selection, and body content following Conventional Commits format) and 'when' (Use when committing code changes in Ruby or Ruby on Rails projects).

Includes strong natural trigger terms: 'committing code changes', 'Ruby', 'Ruby on Rails', 'commit message', 'Conventional Commits'. These are terms users would naturally use when needing this skill.

Highly distinctive — scoped specifically to Ruby/Rails projects and Conventional Commits format for commit messages. Unlikely to conflict with general git skills or non-Ruby commit message skills due to the language-specific and format-specific qualifiers.