The body is lean and assumes Claude's competence — it jumps to a concrete command, a representative fixture, a matching test, and a numbered procedure, with no explanation of concepts Claude already knows; every section earns its place.

It provides a fully executable command (`bunx vitest src/test/video.test.tsx`), copy-paste-ready fixture and test code, and concrete file paths, so Claude can act immediately without filling in gaps.

The 'Adding a new test' steps are clearly numbered with helpful 'Important' callouts, and step 4 runs the test, but there is no explicit validation/feedback loop (e.g. confirm the snapshot passes, or what to do on a snapshot mismatch), which leaves a checkpoint implicit.

There are no bundle files and none are needed; the content is organized into clear sections (overview, Example, Adding a new test) and stays self-contained, which satisfies the simple-skill allowance for a top score.

The phrase 'Add a test case to the web renderer' names a concrete action ('Add a test case') and a specific domain ('web renderer'), but only one action is given rather than the multiple concrete actions a score of 3 requires.

It states what the skill does (add a test case) but provides no 'Use when...' clause or equivalent explicit trigger guidance, which per the guidelines caps completeness at 2.

It includes relevant natural terms a developer might say ('test case', 'web renderer', 'test'), but coverage is thin — no mention of vitest, snapshots, or fixtures that users would commonly reference, matching the 'some relevant keywords but missing common variations' anchor.

'web renderer' is a fairly specific niche, but the single short phrase lacks distinct trigger terms, so it could still overlap with general testing skills rather than being unmistakably unique.