Conciseness

The body is dense and assumes competence — it explains no general concepts and is composed of terse rules and contracts. It loses a point for repetition: the re-arm instruction ('run /computer-use on ... and approve the platform permission prompt') appears nearly verbatim in both 'Host vs Docker Desktop Boundary' and 'Tool Contract', and the linux-desktop/browser fallback prohibitions are each stated twice across sections. This fits anchor 4 ('efficient; minor instances that could be trimmed') rather than 3, since there is no padding or over-explanation — only duplicated safety instructions.

Actionability

Fully executable guidance: a concrete JSON tool-call example, a complete argument contract for every action, exact recovery commands ('/computer-use on', 'chrome://inspect/#remote-debugging', '/browser host on'), and precise machine-readable signals to branch on ('COMPUTER_USE_REARM_REQUIRED', 'background_unavailable', 'focus_verified=true'). This matches the top anchor for an instruction-style skill.

Workflow Clarity

The 'Core Loop' is a clearly sequenced 12-step process with explicit validation checkpoints and error-recovery feedback loops: inspect the fresh screenshot after every action, fail closed on unverifiable keyboard targets, retry once via explicit 'capture' before repeating, and switch strategy after two failed attempts. For state-changing desktop actions, screenshot-based verification is built in, so the destructive-operation cap does not apply; checkpoints are explicit and reinforced in the Operating Rules rather than left implicit.

Progressive Disclosure

Good structure: the body is organized into clear sections and correctly delegates backend detail to one-level-deep pointers ('load host-computer-use-linux', 'host-computer-use-macos', 'host-computer-use-windows') rather than inlining it, with no nested reference chains. It falls short of 5 because there is no bundle (references/scripts/assets) and some material — e.g. the Linux AT-SPI rules and popup/keyboard heuristics in 'Operating Rules' — could live in those backend-specific files instead of the main SKILL.md, which is over 100 lines. The references that do exist are clearly signaled and the split is appropriate, so the gap is minor organization rather than inline dumps or buried references.

Specificity

The description lists multiple concrete actions — 'screenshots, screen inspection, menus, native app UI, OS-level clicking, scrolling, typing, or checking computer_use_remote status' — giving comprehensive, concrete coverage of the skill's capabilities rather than vague domain language. It stays in third-person/declarative voice with no first- or second-person phrasing, so no voice penalty applies.

Completeness

Both 'what' and 'when' are explicitly answered: 'Beta desktop control through the connected A0 CLI host' states what it does, and 'Use for the user's host/local computer screenshots, screen inspection, menus...' gives concrete trigger phrases. It goes further with explicit negative boundaries ('Do not use for ordinary browser navigation; host browser requests should use the browser tool').

Trigger Term Quality

Good keyword coverage with natural synonyms in the description itself ('host/local computer', 'screen', 'screenshots', 'native app UI', 'clicking, scrolling, typing'), plus the explicitly named tool and disambiguators like 'linux-desktop' and 'browser tool'. A few very natural user phrases ('my screen', 'my computer', 'my desktop') appear only in the triggers list rather than in the description field itself, keeping it just short of comprehensive.

Distinctiveness Conflict Risk

A clear niche with minimal conflict risk: it scopes to the 'connected A0 CLI host' / 'host/local machine', explicitly directs 'Use instead of linux-desktop' and routes browser tasks to 'the browser tool', so it is well-distinguished from adjacent skills.