Conciseness

The ~25-line body is lean with no padding and no explanation of concepts Claude already knows: a one-line purpose statement ("Use this skill when the app needs readiness checks before a user joins a meeting or video session"), a five-step workflow of terse imperatives, and a reference list. Every token earns its place, matching anchor 5.

Actionability

Steps enumerate concrete check categories ("browser support, camera, microphone, speaker, network, CPU, or diagnostic report") and concrete debug areas ("browser permissions, device enumeration, HTTPS requirements, firewall behavior"), but there is no executable guidance — no Prober/Reporter initialization, no diagnoseAudio/startToDiagnose calls, no commands (those specifics live only in the referenced files). This matches anchor 3: "some concrete guidance but incomplete... missing key details"; it exceeds anchor 2 because the enumerated categories are specific, but misses anchor 4's "concrete code or commands".

Workflow Clarity

The five steps form a coherent sequence (define gate → run diagnostics → decide failure policy → keep results isolated → debug), but there are no validation checkpoints or feedback loops (e.g., how to verify a check actually ran or how to interpret a failed result before deciding block/warn/capture). Anchor 3 ("steps listed but validation gaps; checkpoints missing or implicit") is the best fit — better sequenced than anchor 2, but without the checkpoints of anchor 4.

Progressive Disclosure

Scored against the actual bundle: of the six referenced paths in SKILL.md, only references/full-guide.md exists; probe-sdk.md, concepts/architecture-and-lifecycle.md, examples/diagnostic-page-pattern.md, examples/comprehensive-network-pattern.md, and troubleshooting/common-issues.md are all missing, and full-guide.md itself links mostly to those same missing files plus out-of-bundle sibling skills. The lean overview-plus-references shape is right, but 5/6 of the navigation targets do not resolve, so navigation effectively fails — below anchor 3's "references present" and at anchor 2's level of structure that does not work.

Specificity

The description "Use when using Probe SDK." names the domain (a specific Zoom SDK) but states zero concrete actions — nothing about running preflight diagnostics, device checks, or readiness gating. It is not purely abstract like "Helps with documents" (anchor 1), but it sits at the bottom of anchor 2's "actions are minimal or generic".

Completeness

Only a 'when' is present and it is circular ("Use when using Probe SDK" — use it when you're using it), with no 'what' whatsoever. This matches anchor 2 ("only 'when' is present without 'what'"); the circularity keeps it from scoring 3, and there is nothing vague-but-present for 'what' to lift it above 2.

Trigger Term Quality

The only trigger phrase is the literal product name "Probe SDK"; a user needing readiness checks would far more naturally say "preflight check", "test camera/microphone before joining", "readiness check", or "device diagnostics" — all absent. This matches anchor 2 ("one or two generic keywords; missing the natural phrases users say") and falls short of anchor 3's "some relevant keywords".

Distinctiveness Conflict Risk

Naming a specific product (Probe SDK) means low conflict risk with unrelated skills, but the description never articulates its niche (client-side readiness diagnostics before join) versus sibling Zoom skills (Meeting SDK, Video SDK), so it "could still overlap with similar skills" (anchor 3). It lacks the clearly stated distinct triggers of anchor 4/5.