The body is lean and assumes Claude's competence: it gives the git commands, regex patterns, and expected outputs without explaining what Git or branches are, so every section earns its place at anchor 3.

It provides fully executable commands (git rev-parse checks, the branch-name command, env-var fallback) plus concrete regex patterns and exact output strings, matching the copy-paste-ready anchor 3.

The flow is clearly sequenced with explicit checkpoints: a git-availability guard, branch-name retrieval, pattern matching, and spec-directory existence checks with defined outputs, satisfying anchor 3 for this simple skill.

At under 50 lines with no need for external references, the well-organized sections (Prerequisites, Validation Rules, Execution, Graceful Degradation) meet the simple-skill threshold for anchor 3.

The phrase 'Validate current branch follows feature branch naming conventions' names one concrete action but does not list multiple specific actions, matching anchor 2 rather than the vague anchor 1 or the multi-action anchor 3.

It states what the skill does but lacks a 'Use when...' clause or equivalent explicit 'when' guidance, which per the rubric guidelines caps completeness at 2.

Relevant terms like 'current branch' and 'feature branch naming conventions' appear, but common variations and an explicit trigger clause are missing, so it is at anchor 2 rather than full coverage at anchor 3.

The narrow spec-kit feature-branch naming niche is clearly distinguishable and unlikely to trigger for unrelated skills, matching anchor 3.