Conciseness

The body is ~40 lines with zero concept explanations or padding — every line is either an executable command, a flag rule, or a command-table entry (e.g. "Use `--readonly` when the task must not mutate Google data"). This matches the score-5 anchor: lean, assumes Claude's competence, every token earns its place.

Actionability

The Safe start block gives three copy-paste-ready commands (`gog auth list --check --json --no-input`, `gog schema youtube --json`, `gog --readonly --account user@example.com youtube --help`) plus concrete per-flag rules, and the Commands table enumerates all seven subcommands with a pointer to `--help` and `gog schema ... --json` for exact syntax. This matches the score-5 anchor: fully executable guidance covering the common cases.

Workflow Clarity

There is a clear startup sequence (check auth → read schema → dry help) and explicit pre-write checkpoints ("`--dry-run` before supported writes", "Confirm the exact account, object, and mutation before any write or delete", `--readonly` guard), matching the score-4 anchor of 'clear sequence with most checkpoints present'. It stops short of 5 because destructive operations (playlist and subscription management) have no validate → fix → retry feedback loop or post-write verification step.

Progressive Disclosure

The body is a well-organized overview (Safe start, Commands) under 50 lines, and appropriately keeps per-command flag detail behind runtime discovery rather than inlining it — good structure matching the score-4 anchor. It falls short of 5 because the single file reference, `Read ../gog/SKILL.md first for shared auth, output, safety, and live-write rules`, is a cross-skill path that does not resolve from the skill's location in this bundle, leaving essential shared rules unverifiable.

Specificity

The phrase "YouTube operations through gog" names the domain and tool but the action word "operations" is entirely generic — it never says whether it searches, lists, comments, or manages anything. This matches the score-2 anchor ('Names the domain but actions are minimal or generic', e.g. 'Processes PDF files') and falls short of score 3, which requires 1-2 concrete named actions.

Completeness

There is only a vague 'what' ("YouTube operations") and no 'when' clause at all. The score-2 anchor ('Has a vague what and no when') is the best fit; it cannot reach score 3 because the 'what' is not clear, and the rubric caps completeness at 3 anyway when a 'Use when...' trigger clause is missing.

Trigger Term Quality

"YouTube" is a relevant and distinctive keyword a user would naturally say, but no variations or synonyms appear — no "videos", "comments", "playlists", "subscriptions", or "channel". This is the score-3 anchor ('Some relevant keywords but missing common variations or synonyms'); it is above score 2 because the single keyword is specific and high-signal rather than generic.

Distinctiveness Conflict Risk

The YouTube domain is a clear niche unlikely to trigger for unrelated skills, so overlap risk is minor — matching the score-4 anchor. It does not reach score 5 because the vague "operations" leaves room for collision with any other YouTube-related skill (e.g. a video-download or analytics skill).