Conciseness

The body is dense with backend-specific, non-obvious facts (feature names, dispatch semantics, error codes) and mostly assumes Claude's competence, but the screenshot-verification rule is stated three times ("Use it to choose an element, not as final visual proof"; "AX actions are attempts, not proof... inspect that image"; "Treat these as attempts. After any hide or minimize shortcut, inspect the fresh screenshot"), and widely known shortcuts like Command+H/M add minor padding. Not 3, since no genuinely new-to-Claude concepts are over-explained; not 5 due to the repeated verification admonitions.

Actionability

Fully executable, copy-paste-ready JSON tool-call payloads are given for `element_action`, `ax_snapshot`, and `ax_action`, with a concrete operation list (press/focus/set_value) and specific error-recovery branches ("If an action reports ambiguity, take a fresh snapshot and narrow the target with role plus title/description/identifier") and an exact remediation command (`/computer-use on`). The common cases are covered by concrete examples.

Workflow Clarity

Sequences are explicit ("list_windows -> get_window_state -> element_action") with clearly defined fallback flows, and validation checkpoints plus feedback loops are present: verify via the attached screenshot "before saying the requested outcome happened", re-snapshot on ambiguity or missing target, and stop-and-ask on permission failure codes. Not 4, because error-recovery loops and verification steps are explicit rather than merely implied.

Progressive Disclosure

No bundle files (references/, scripts/, assets/) exist, and this ~100-line skill is self-contained and appropriately so: everything is organized under three well-labeled sections (macOS AX Targeting, macOS Window Actions, Permissions) with nothing inlined that clearly belongs in a separate file. Not 4, since there are no organization gaps — content placement and navigation are clean.

Specificity

The description lists several concrete capability areas — "Covers AX structural targeting, macOS window actions, and screenshot verification" — and names the specific tool `computer_use_remote`, so it goes beyond naming the domain. It falls short of 5 because these are capability categories rather than the full set of concrete actions, and operations like dispatch and permission handling only surface in the body.

Completeness

Both parts are explicitly answered: the what is "Backend-specific macOS guidance for `computer_use_remote`" with the coverage list, and the when is "Load when a tool result reports backend_family/backend_id `macos` or Accessibility-tree features" — a concrete, explicit trigger clause. Not 4, because the 'when' is fully explicit rather than merely present but loosely specified.

Trigger Term Quality

Relevant keywords are present ("macOS", "Accessibility-tree", "window actions", "screenshot verification"), but the explicit load condition leans on machine metadata jargon ("backend_family/backend_id `macos`") rather than natural user phrasing, and common variations like "Mac" or "Apple" are missing. Not 2, since multiple genuinely relevant terms appear rather than one or two generic ones.

Distinctiveness Conflict Risk

It is scoped to a single tool and a specific backend identifier ("Backend-specific macOS guidance for `computer_use_remote`") and the body explicitly excludes "Linux, Windows, Xpra, Docker, or browser-only tasks". This is a clear niche with a highly distinct trigger, so minimal conflict risk; not 4 because there is no meaningful overlap with sibling skills.