Conciseness

The ~28-line body is lean and assumes Claude's competence: no concepts are explained, every line is an instruction or a guardrail (e.g. "Review only; do not change files"). Repetitions like "Never use another model" and "Never silently fall back" are deliberate failure-mode guardrails, not padding, so it matches the anchor 5 rather than 4.

Actionability

Concrete verification commands are given in full ("room-cli provider models codex --json", "room-cli thread show", "room-cli thread wait", "room-cli thread output") plus the verbatim brief sentence to include. It stops short of 5 because the spawn block lists flags (--provider codex --model gpt-6-astra...) without the actual command invocation, deferring it to /room-cli, so it is not fully copy-paste ready.

Workflow Clarity

The sequence is clear with explicit validation checkpoints at every phase: pre-spawn model/effort verification, post-spawn thread verification, a failure branch ("If either check fails, stop and report the blocker"), and completion verification ("idle status, timeouts, and queued retries are not completion"). The operation is review-only with no file changes, so the destructive/batch cap does not apply.

Progressive Disclosure

The skill is under 50 lines with no bundle files, and the body is organized into clear Run / Review brief / Result sections. The single external reference (/room-cli) is clearly signaled and one level deep, which qualifies for the simple-skill exception to score 5.

Specificity

"Launch an independent GPT-6-Astra code review and return it verbatim" lists several specific actions (launch the review, via a named model, return output verbatim) with only minor coverage gaps. It does not reach 5 because the actions are narrow — no detail on what the review covers or how results are delivered beyond 'verbatim'.

Completeness

Both what ("Launch an independent GPT-6-Astra code review and return it verbatim") and when ("Use only when the user explicitly invokes /gpt-review") are clearly and explicitly stated with a concrete trigger phrase. The 'when' could not be more explicit for an invocation-only skill, so it exceeds the anchor 4 example where the trigger is merely adequate.

Trigger Term Quality

"code review", "GPT-6-Astra", and "/gpt-review" give good keyword coverage, and the explicit slash-command trigger is exactly how a user would invoke it. It falls short of 5 because natural synonyms like 'second opinion', 'review my diff', or 'AI review' are absent.

Distinctiveness Conflict Risk

The named model (GPT-6-Astra) and the hard gate on explicit /gpt-review invocation give it a clear niche with distinct triggers and minimal conflict risk. It is far more distinguishable than the anchor 4 example, which overlaps with generic document skills.