Conciseness

The body is genuinely non-obvious in places ("A green detector is evidence only after you have watched it go RED on a known-bad input"), but it is noticeably padded: the two war-story sections ("The override that started this skill", "The inverse failure") run long, and the lessons taught there are then restated almost verbatim in the 12-row anti-patterns table ("One negative probe ≠ absence", "200 is liveness, not correctness", "Solved problem = untested edge-case claim"). This fits 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than anchor 4, since whole sections are duplicated.

Actionability

For an instruction-only skill the guidance is fully actionable: copy-paste-ready probes ("curl -s $URL | jq .nextToken", the CometRelayEnvironment browser snippet), a complete fill-in verification-ledger template with worked example rows, a library-inventory template, an explicit probe-selection heuristic ("if the thing I am checking were broken, would this probe look any different?"), and an eval-mode guard with exact behavioral rules. Per the code-vs-instruction scoring note, absence of code is not penalized when guidance is this concrete.

Workflow Clarity

The 6-step workflow is clearly sequenced, turned into a TodoWrite checklist with per-claim todos, and has explicit validation checkpoints and feedback loops: [B] tests are BLOCKING, a negative probe triggers a second differently-shaped probe, evidence must be captured before [V], and Step 6 is an explicit gate ("A decision may NOT be locked… while any claim it depends on is unclassified or still [B]-unrun") with [R] items carried to a closure gate. This matches the anchor-5 pattern of clear sequence with explicit validation and error-recovery loops.

Progressive Disclosure

The skill is a single ~170-line file with no bundle directories and no external references; the section headers are sensible but content that would sit better in a separate reference file — the two multi-paragraph case studies and the liveness-vs-correctness table — is inlined in the always-loaded SKILL.md. This fits 'some structure but could be better organized; content that should be separate is inline' rather than anchor 4, which presumes appropriate placement across files.

Specificity

The description lists multiple concrete, specific actions — "run the code, hit the API with curl, probe the live browser DOM/store, build a proof-of-concept; for requirements, diff the plan section-by-section against the original design doc + ticket" — comprehensively covering both technical and requirement-coverage claims. This matches the anchor 'lists multiple specific concrete actions; comprehensive coverage' rather than anchor 4, since coverage has no meaningful gaps.

Completeness

It explicitly answers both questions: the "what" is grounding every technical and requirement-coverage claim against the source of truth, and the "when" is an explicit "Use when stress-testing assumptions, before locking an architectural decision, or when the user says…" clause with concrete trigger phrases. This is a clear match for the anchor-5 exemplar.

Trigger Term Quality

Strong natural trigger phrases are quoted verbatim — "verify first", "verify with practical tests", "prove it", "test, don't assume", plus "stress-testing assumptions" — so users would naturally say these. It falls short of anchor 5 only because a few common variants (e.g. "double-check this", "is this actually true", "validate this assumption") are absent.

Distinctiveness Conflict Risk

The verification/ground-truthing niche and quoted triggers ("prove it", "verify first") are distinctive, but phrases like "prove it" and "test, don't assume" carry minor overlap risk with general testing or code-review skills. It sits between anchors 4 and 5; 'mostly distinct; minor overlap risk with closely related skills' is the closer fit.