Conciseness

The ~20-line body is lean and every line earns its place: a two-sentence scope note, two conditionally-triggered reference pointers, and a return instruction. No explanation of concepts Claude already knows and no padding, matching the top anchor.

Actionability

The routing guidance is conditional and specific ("Read each applicable reference fully", "Do not load it for standalone test work"), but the actual test-design and naming guidance lives entirely in test-design-and-writing.md and spec-loop-task-verification.md, neither of which exists in the bundle — the specific steps to execute are missing. Not a 1 because the routing instructions themselves are concrete rather than abstract.

Workflow Clarity

As a simple router skill the single action is unambiguous: read the applicable reference(s) by condition, then "Return to the invoking workflow afterward", with explicit negative guidance for the Spec Loop-only file. Not a 5 because the central step — reading the referenced files — cannot actually be executed since neither file is present in the bundle.

Progressive Disclosure

The reference signaling is well-formed (one level deep, each with trigger conditions and a content preview), but scored against the actual bundle structure both referenced paths are dangling — no reference files exist anywhere in the bundle. There is no content to progressively disclose, leaving the structure non-functional rather than merely imperfect (anchor 3's 'not clearly signaled' or anchor 2's 'buried' don't apply, but the effective deliverable is as empty as the anchor-2 failure).

Specificity

Lists several concrete actions — "Plan test coverage", "choose behavioral names", "drafting or revising a Spec Loop Test specification" — covering design, writing, changing, and review. Not a 5 because the actions stay at the planning level without the comprehensiveness of concrete capability lists; not a 3 because more than 1-2 actions are named.

Completeness

Explicitly answers both: what ("Plan test coverage and choose behavioral names... Keep each test's setup, action, and expected result easy to see") and when ("Use for naming alone, even before implementation", "when designing, writing, changing, or reviewing automated tests", "for drafting or revising a Spec Loop Test specification"). The 'Use for' trigger guidance is explicit and covers multiple concrete scenarios, matching the top anchor; it clearly exceeds the anchor-4 example whose 'when' is generic.

Trigger Term Quality

Natural terms users would say are present: "test coverage", "automated tests", "naming", "writing, changing, or reviewing" tests, plus the distinctive "Spec Loop Test specification". Missing common variations like "unit tests", "integration tests", or "test names" to reach 5; well above the generic-keyword level of 3.

Distinctiveness Conflict Risk

The pairing of coverage planning, behavioral naming, and Spec Loop Test specifications carves a mostly distinct niche with explicit scope ("works with or without Spec Loop"). Not a 5 because "General testing guidance" keeps broad overlap risk with any generic test-writing or TDD-style skill.