Conciseness

The body is efficient and repo-specific ('./dt <script> [args]', 'Test files are usually defined alongside their implementation'), with only minor over-explanation in Best practices ('Run tests often to verify your changes', 'Periodically build to check for errors') that Claude already knows and could be trimmed — matching anchor 4 rather than anchor 5's 'every token earns its place'.

Actionability

Fully executable, copy-paste-ready commands cover every common case: './dt test <FILEPATH>' with a concrete directory example ('./dt test front_end/models/trace'), 'autoninja -C out/Default', './dt lint <PATH>', and three complete get_cl_test_results.py invocations with flags (--cl, --output-dir, --test-filter, --apply-goldens). This matches anchor 5; there are no gaps versus the anchor-4 example.

Workflow Clarity

Per-task sequences are clear and the dev loop has some checkpoints ('Run tests often', 'git cl presubmit -u at the end of your code changes'), but the batch '--apply-goldens' operation ('apply Linux actual_image screenshot artifacts directly to test/goldens/linux/...') has no explicit post-apply validation step. Per the judging guideline, a batch operation without validation caps workflow clarity at 3, matching anchor 3's 'sequence present but checkpoints missing or implicit' rather than anchor 4.

Progressive Disclosure

The body is 46 lines (under 50) with no bundle files and no need for external references, and is well-organized into focused sections (Running scripts, Testing, Building & compiling, Linting, Fetching Tryjob Results, Screenshot Golden & Inspection Rules, Best practices). The rubric's simple-skill exception allows a 5 with just well-organized sections, which this clearly satisfies.

Specificity

The description lists several concrete actions ('build the project, run tests, or verify code health', 'correctly format these commands, filter test runs, and interpret failures') with named commands, which fits the anchor-4 'several specific actions; minor gaps' (tryjob fetching and screenshot goldens from the body are unmentioned) rather than anchor 5. However, it is written in second person ('You MUST use this skill', 'ANY TIME you need'), which the judging guidelines penalize by reducing specificity by 1, yielding 3.

Completeness

It explicitly answers both 'what' ('contains critical, repository-specific instructions on how to correctly format these commands, filter test runs, and interpret failures') and 'when' with concrete trigger phrases ('ANY TIME you need to build the project, run tests, or verify code health in DevTools' and 'before executing commands like ./dt test, ./dt build, autoninja, or linters'), matching the anchor-5 example. The anchor-4 caveat ('when could be more explicit') does not apply since the when-clause is highly explicit.

Trigger Term Quality

Good keyword coverage of natural phrases users would say ('build the project', 'run tests', 'verify code health') plus repo-specific tool names ('./dt test', './dt build', 'autoninja', 'linters'), matching anchor 4's 'good keyword coverage; a few natural terms missing' (e.g., 'compile', 'presubmit', 'check the build'). Not 5 because it lacks comprehensive synonym/variation coverage.

Distinctiveness Conflict Risk

It is pinned to a clear niche ('in DevTools', './dt', 'autoninja', 'never run these through npm or npx') making it mostly distinct, matching anchor 4. Not 5 because the broad trigger 'ANY TIME you need to build the project, run tests' creates minor overlap risk with generic build/test/verification skills; not 3 because the DevTools pinning and repo-specific commands are clearly more distinct than 'somewhat specific'.