It names the domain (TDD, code changes) and mentions some actions ('build behavior-safe code changes', 'RED/GREEN evidence'), but doesn't list multiple specific concrete actions like writing tests, running tests, refactoring, or verifying test output.

It answers both 'what' (build behavior-safe code changes with TDD and RED/GREEN evidence) and 'when' (when he-plan or he-work requires TDD for a concrete behavior target) with an explicit 'Use when' clause containing trigger conditions.

Includes relevant terms like 'TDD', 'RED/GREEN', and 'behavior target', but uses non-standard terms like 'he-plan' and 'he-work' which are internal/custom references unlikely to be naturally said by users. Missing common variations like 'test-driven development', 'unit tests', 'test first'.

The combination of TDD, RED/GREEN evidence, and the specific references to 'he-plan' and 'he-work' create a clear niche that is unlikely to conflict with other skills. It targets a very specific workflow pattern.

The skill is moderately efficient but includes some unnecessary sections. The 'Progressive Disclosure Entry' preamble explaining what 'archived' means is meta-commentary Claude doesn't need. The Subagent Routing section repeats a reference already listed in Full Context. The Examples section provides natural language prompts rather than actionable examples, and the Philosophy section adds little operational value.

The procedure provides a clear sequence but remains at a high level of abstraction—'produce a failing test first (RED), then apply the smallest fix (GREEN)' is directional rather than concrete. There are no executable code examples, no specific test framework commands (beyond the validation audit command), and no sample test code showing what a RED/GREEN cycle looks like in practice. The skill relies heavily on deferred references for actual operational detail.

The 5-step procedure provides a reasonable sequence and the constraint 'Do not skip RED verification' acts as a checkpoint. However, there are no explicit validation gates between steps (e.g., 'confirm RED output before proceeding to GREEN'), no error recovery guidance if a test doesn't fail as expected, and the validation section only covers skill auditing rather than the TDD workflow itself. For a workflow involving iterative test-code cycles, the lack of inline verification checkpoints is a gap.

The skill excels at progressive disclosure with a concise overview and well-organized, clearly signaled references with 'Read when' annotations explaining when to load each reference. References are one level deep and cover distinct concerns (mocking, interface design, refactoring, etc.). The structure makes it easy to navigate to the right detailed document based on the current need.