Conciseness

The body is repo-specific with no padding about concepts Claude already knows, but the report-shape rules are repeated nearly verbatim three times — "Never add a sixth `##`: `## Summary`, `## Verdict`…" and "A summary sentence goes at the top of `## Coverage gaps`" appear in both Step 0 and the final section, and the `grep -c` shape check is given twice. This is more than the minor over-explanation of the 4 anchor, but the content is operational rather than padded, keeping it above 2.

Actionability

Guidance is copy-paste ready throughout: the heredoc report skeleton, `bun run --cwd <workspace-path> test:run`, `STRYKER_TESTS='tests/lib/money.test.ts' bun run --cwd cire/api test:mutation --base "$DIFF_BASE"`, the `grep -c '^## \(Build\|…\)$' TEST-REVIEW.md` validation, and a fill-in four-field finding template. Placeholders like `<workspace-path>` are inherent parameterization, not gaps, so the 4 anchor does not fit better.

Workflow Clarity

Steps 0–5 are clearly sequenced with explicit validation checkpoints ("It must print `5`") and error-recovery feedback loops ("restore the five headings, put the gap back under `## Coverage gaps`"). The "No step is a stop" failure policy and "record each gap the moment you have it" make the checkpoints explicit, matching the 5 anchor rather than the 4.

Progressive Disclosure

There are no bundle files; everything lives inline in one ~280-line SKILL.md, and substantial content that belongs in reference files — the Step 5 mutation-testing details and the tautology-shape checklist — is inlined. Structure and navigation are good (clear `##` steps, signaled `wiki/conventions/` pointers), which lifts it above the 2 anchor, but the inline bulk fits the 3 anchor better than the 4.

Specificity

The description lists multiple concrete actions — "building and running the affected workspaces", "auditing changed code for missing test files, untested exports, untested error paths and untested routes", and "reporting gaps with T-M/U/E/R/S IDs in the four-field format" — giving comprehensive coverage of what the skill does. It exceeds the score-4 anchor (minor gaps) because the action list spans the full pipeline from build to report.

Completeness

It explicitly answers both questions: the what is the concrete build/test/audit/report action list, and the when is the opening "Use when checking whether a branch is adequately tested" with concrete trigger phrasing. The 4 anchor would require the when to be less explicit, which it is not.

Trigger Term Quality

Phrases like "checking whether a branch is adequately tested", "untested exports" and "untested error paths" are terms a user would naturally say, giving good keyword coverage. It falls short of the 5 anchor because common variations such as "test coverage", "coverage gaps" or "unit/integration tests" are absent.

Distinctiveness Conflict Risk

The niche — auditing a branch's test coverage with a T-M/U/E/R/S finding taxonomy in a four-field report — is distinct, and the trigger (branch test adequacy) is unlikely to fire a neighboring skill. No minor overlap risk keeps it below the 5 anchor.