Names the domain (API mocking) and mentions some actions ('Design mocks that simulate real API behavior'), but lacks concrete specific actions like 'create mock endpoints', 'generate response schemas', or 'configure latency simulation'.

Describes what it does (design API mocks) but completely lacks a 'Use when...' clause or any explicit trigger guidance for when Claude should select this skill. Per rubric guidelines, missing explicit trigger guidance caps this at 2, but the 'what' is also weak, warranting a 1.

Includes relevant terms like 'API mocking', 'mock services', 'development', 'testing', 'demos', but misses common variations users might say like 'stub', 'fake API', 'mock server', 'API simulation', or 'test doubles'.

The API mocking focus provides some distinctiveness, but 'development, testing, and demos' is broad enough to potentially overlap with general testing skills, API development skills, or demo preparation skills.

The skill is reasonably efficient but includes some unnecessary sections like 'Context' that restates the obvious, and the 'Use this skill when' section explains scenarios Claude could infer from the skill description.

The skill provides only vague guidance like 'Clarify the API contract' and 'Define mock routes' without any concrete code examples, commands, or executable snippets. It describes what to do rather than showing how to do it.

Instructions are listed as bullet points suggesting a sequence, but there are no explicit validation checkpoints, no feedback loops for error recovery, and the steps are abstract rather than concrete actions with verification.

The skill appropriately keeps the overview concise and references a separate implementation playbook for detailed code samples and templates, with clear one-level-deep navigation.