Conciseness

The body is mostly tight and imperative, but the same enforcement message is repeated across three sections ("Delete it. Start over" in The Iron Law, "Keep as reference, write tests first... Delete means delete" in Common Rationalizations, and "Keep as reference" or "adapt existing code" in Red Flags), and the ~20-line graphviz `dot` diagram renders as raw code in markdown, adding tokens without adding instruction. Not level 4 because the duplication and the decorative diagram are trimming candidates beyond 'minor'; not level 2 because every section still carries operational content rather than padding.

Actionability

Concrete, executable guidance dominates: real commands (`npm test path/to/test.test.ts`), complete TypeScript test/implementation examples with Good/Bad contrasts, a worked bug-fix walkthrough, a verification checklist, and a troubleshooting table. Not level 5 because some examples are fragments — the GREEN example for retry is fully executable, but `submitForm` ends in `// ...` and the Bad GREEN example is a stub with `// YAGNI` — and the link to writing-good-tests.md leads nowhere.

Workflow Clarity

The Red-Green-Refactor cycle is explicitly sequenced with a mandatory verification command after each phase ("Verify RED - Watch It Fail... MANDATORY. Never skip", "Verify GREEN... MANDATORY"), includes feedback loops for error recovery ("Test errors? Fix error, re-run until it fails correctly", "Test fails? Fix code, not test"), and closes with a per-item verification checklist plus a "When Stuck" recovery table. This matches the level-5 anchor: clear sequence, explicit validation steps, and error-recovery loops.

Progressive Disclosure

The single external reference is well-signaled inline ("read [writing-good-tests.md](writing-good-tests.md) for the rules that keep tests honest") and one level deep, but the file does not exist — no references/ directory or writing-good-tests.md is present anywhere in the skill bundle, so the link is broken. The body is also ~315 lines with content (the Good Tests rules and the Common Rationalizations table) that reads like material meant for that missing file. Not level 4 because a dangling reference defeats navigation; not level 2 because section structure is clear and there is no monolithic wall of text.

Specificity

The description names the domain ("implementing any feature or bugfix") but states no action at all — a reader cannot tell from it that the skill mandates test-first development. Matches the level-2 anchor 'Names the domain but actions are minimal or generic'; not level 3 because it lists zero concrete actions (no 'write failing tests first', 'verify red/green'), and not level 1 because the domain is named and the timing constraint is concrete.

Completeness

Only the 'when' is present ("Use when implementing any feature or bugfix, before writing implementation code") — the 'what' (what the skill actually does) is missing entirely, matching the level-2 anchor 'only when is present without what'. Not level 3 because that anchor requires a clear 'what'; not level 1 because the 'when' clause is explicit and specific about timing.

Trigger Term Quality

"implementing any feature or bugfix" uses natural phrases users say ("implement a feature", "fix a bug"), but the vocabulary users would most plausibly use for this skill — test, tests, testing, TDD, test-first, unit test — is entirely absent. Matches level 3 'Some relevant keywords but missing common variations or synonyms'; not level 4 because the missing terms are the skill's own subject matter, not just edge variations.

Distinctiveness Conflict Risk

"any feature or bugfix" covers essentially every coding task, so this description would trigger alongside virtually any implementation, refactoring, or testing skill — matching level 2 'Very broad; high overlap risk with many similar skills'. Not level 3 because the only distinguishing signal (write tests first) is absent; not level 1 because it is at least anchored to feature/bugfix work rather than being fully generic like 'Helps with code'.