Conciseness

Sentence-level style is lean and imperative with no tutorial padding about concepts Claude already knows, but the same anti-rationalization content is covered three times ("Why Order Matters", the "Common Rationalizations" table, and "Red Flags"), and "Final Rule" restates "The Iron Law". This matches 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than the minor-trimming of score 4 or the padded verbosity of score 2.

Actionability

The body gives copy-paste-ready material throughout: exact pytest commands with test-path selectors, complete good/bad test examples, a filled-in delegate_task template, and concrete problem/solution tables. This matches the anchor for fully executable, specific examples covering the common cases; it is well above the 'concrete code with minor gaps' level of score 4.

Workflow Clarity

The RED-GREEN-REFACTOR cycle is sequenced with mandatory verification steps at each phase ("Verify RED — Watch It Fail", "Verify GREEN — Watch It Pass" plus a full-suite regression run), explicit error-recovery feedback loops ("Test fails? Fix the code, not the test", "If tests fail during refactor: Undo immediately"), and a completion checklist. This matches the top anchor: clear sequence, explicit validation, feedback loops, and a checklist.

Progressive Disclosure

The single SKILL.md has no bundle files, and the content is organized under clear, well-ordered sections with an overview up front, so structure is good. However, at roughly 350 lines, the rebuttal/reference material (rationalizations, red flags) is inlined where it could be split into a reference file, which keeps it at 'good structure with minor organization gaps' rather than the exemplary split of score 5.

Specificity

The description names its domain ("TDD") and one core concrete action ("enforce RED-GREEN-REFACTOR, tests before code"), matching the anchor for 1-2 concrete actions without comprehensive coverage. It does not list several specific actions like the score-4 anchor, and it is more than the minimal/generic naming of the score-2 anchor.

Completeness

The 'what' is stated clearly (enforce the red-green-refactor cycle, tests before code), but there is no 'Use when...' clause or equivalent trigger guidance, which caps completeness at 3 per the judging guidelines. Score 4 requires both 'what' and an explicit 'when', which is absent here.

Trigger Term Quality

It includes relevant keywords ("TDD", "tests", "RED-GREEN-REFACTOR") but misses common variations users would naturally say, such as "test-driven development" spelled out, "write tests first", or "unit tests". This matches 'some relevant keywords but missing common variations'; it lacks the fuller synonym coverage of score 4.

Distinctiveness Conflict Risk

"TDD" and "RED-GREEN-REFACTOR" mark a clear niche that is unlikely to trigger for unrelated skills, but the generic term "tests" carries minor overlap risk with closely related general-testing or debugging skills. It is mostly distinct with minor overlap (score 4) rather than the minimal-conflict clarity of score 5.