Conciseness

The body is dense and operational throughout (e.g. "Confirm `vibium check --help` works", "Leave `VIBIUM_AI_REASONING_EFFORT` unset for Anthropic/Google") with no explanation of concepts Claude already knows. Minor trimmable material keeps it at 4: the five-provider environment-variable matrix is reference-like, and "use the `browser` skill if installed" is repeated in two sections.

Actionability

Commands are copy-paste ready and cover the common cases: `vibium check --json "<claim>"`, `vibium check -i record.zip "<claim>"`, `vibium ready ai --json`, `-o verification.zip`, `--report verdict.json`, `--expect pass`, exact env vars, a worked example claim, and a complete JSON result contract with exit-code semantics. This matches the fully executable anchor.

Workflow Clarity

The numbered "Development loop" is clearly sequenced with explicit validation (read the JSON result and report the actual verdict), a feedback loop ("investigate the evidence, fix the cause, and rerun the original claim... Do not weaken the claim"), error-recovery guidance for REVIEW and each `reason` code, and an explicit stop condition. Setup is gated by `ready ai` exit-code semantics.

Progressive Disclosure

Sections are well organized (Setup, Development loop, Browser cleanup, Recording and report flags, Result contract) and the broader CLI reference is properly deferred ("use the `browser` skill if installed... this skill can run on its own using `vibium <command> --help"); no bundle files exist to verify. It is not 5 because the provider-configuration matrix is reference-like content inlined in the main file, and the under-50-line simple-skill exception does not apply to this ~130-line body.

Specificity

"Independently check application acceptance criteria in a live browser or saved recording with the Vibium CLI" plus "PASS, FAIL, or REVIEW and recorded evidence" names the tool, both verification modes, and concrete outputs. It falls short of 5 because it describes one core action with variants rather than a comprehensive list of multiple distinct capabilities.

Completeness

The what is clear (independent acceptance verification with verdicts and recorded evidence) and an explicit "Use for a formal verification step in the development loop" clause provides the when. Not 5 because the when-clause is abstract and lacks concrete user-side trigger phrases; the explicit "Use for" wording keeps it above the 3 cap.

Trigger Term Quality

Natural terms like "check", "verification", "acceptance criteria", "browser", and "recording" match what users would say. It is not 5 because common synonyms and variations such as "verify", "test", or "QA" are missing, but coverage is good rather than merely partial.

Distinctiveness Conflict Risk

Naming the "Vibium CLI" and framing the niche as independent acceptance verification distinguishes it from building and browser-automation skills. Minor overlap remains with generic testing/verification skills that also mention checking behavior in a live browser, so it is not 5.