Conciseness

The ~45-line body is lean with no explanations of concepts Claude already knows: every sentence is an operational constraint ("Nothing captures logins for you", "Never log in against the real $HOME") or a command, and the one rationale ("a browser flow only completes on the same machine") justifies a requirement. Matches anchor 5.

Actionability

Copy-paste ready bash for the temp-home setup and all four CLIs (mktemp -d, the in_d() env wrapper, aws sso/gh/glab/gcloud login commands) plus the exact save invocation "node <skill dir>/scripts/save-login.mjs aws \"$d\" --label ...", with concrete AWS config-copy guidance. Specific examples cover the common cases, matching anchor 5.

Workflow Clarity

A clear four-step sequence with explicit checkpoints and feedback loops: "When it exits successfully", "never stop the job while the person is approving", "if the save fails, run the script again", "including to check that it works", and "If the login fails or expires, start again from step 1". Destructive operations are guarded ("Never remove the directory yourself"), matching anchor 5.

Progressive Disclosure

The skill is under 50 lines, single-purpose, and organized as numbered steps; its one bundle reference (scripts/save-login.mjs) exists in the bundle, is one level deep, and is clearly signaled at the point of use. This fits the rubric's simple-skill exception for a 5.

Specificity

"Log a CLI in with a browser/device-code flow", "save the result to the keychain", and "request it through execute.credentials" list several concrete actions plus four named CLIs, matching anchor 4. Not 5 because coverage has minor gaps (e.g., the device-code relay step is unmentioned) and the action list is shorter than the comprehensive anchor example.

Completeness

The "what" is clear (log in a CLI and persist it to the keychain), but there is no "Use when..." clause or equivalent explicit trigger guidance; "so later commands can request it" describes purpose, not when to invoke the skill. Per the judging guidelines this caps completeness at 3.

Trigger Term Quality

Natural terms users would say are present: "log in", "aws sso", "gh", "glab", "gcloud", "keychain", "credentials". A few natural synonyms like "sign in", "auth", or "authenticate" are missing, which fits anchor 4 rather than the comprehensive synonym coverage of anchor 5.

Distinctiveness Conflict Risk

The niche is highly distinct — interactive CLI logins persisted to a keychain for execute.credentials — with named CLIs (aws sso, gh, glab, gcloud) serving as distinct triggers and minimal overlap risk with other skills, matching anchor 5.