Conciseness

The body is dense and operational with zero concept explanations — every paragraph carries backend-specific facts (feature flags, error codes, result fields). Two minor trims keep it at 4 rather than 5: the GNOME shortcut list includes generic desktop knowledge ('Super+H: hide the active window', 'Alt+Tab: switch applications'), and 'inspect the fresh screenshot' verification is restated across several paragraphs.

Actionability

Two complete, copy-paste-ready JSON tool-call examples for `ax_snapshot` and `ax_action`, an enumerated operations list with per-operation usage rules, concrete targeting decision rules, and exact error codes (`COMPUTER_USE_WINDOW_REQUIRED`, `COMPUTER_USE_AX_UNAVAILABLE`, `COMPUTER_USE_REARM_REQUIRED`) and result fields (`focus_verified=true`, `actual_dispatch=background`). This fully matches the 'copy-paste ready; covers the common cases' anchor.

Workflow Clarity

The observation -> snapshot -> target -> act -> verify flow is clearly sequenced with explicit validation checkpoints (screenshot proof after every state-changing action, `focus_verified=true`, `actual_dispatch=background`) and thorough feedback loops: ambiguity -> fresh snapshot and narrow, missing target -> fresh snapshot before coordinates, wrong-app text -> stop and reassess, shallow tree -> ordered fallback chain, and explicit permission stop conditions. This matches the 5 anchor's 'explicit validation steps; feedback loops for error recovery'.

Progressive Disclosure

The body is a well-sectioned overview of the core AT-SPI flow, with edge-case X11/XWayland/viewer material correctly offloaded to a single one-level-deep reference that is clearly signaled with its activation condition ('For an X11/XWayland app or remote desktop viewer with an incomplete accessibility tree, read [X11 and viewer workflows](references/x11-viewers.md)'). The referenced file exists and itself references no further files, so navigation is clean and shallow — a direct match for the 5 anchor.

Specificity

The description names the exact tool (`computer_use_remote`) and lists five concrete coverage areas ('verified focus, AT-SPI targeting, XWayland app limitations, remote desktop viewers, and screenshot verification') plus an explicit exclusion ('excludes the internal Docker/Xpra desktop'). It stays at 4 rather than 5 because the items are topical nouns rather than the concrete actions performed in each area, and 4 rather than 3 because coverage clearly exceeds the 1-2 item bar.

Completeness

Both parts are explicit: what ('Host Linux guidance for `computer_use_remote`... Covers verified focus, AT-SPI targeting, XWayland app limitations, remote desktop viewers, and screenshot verification') and when with concrete trigger phrases ('when results report Linux, Wayland, X11, or AT-SPI features'), plus an explicit exclusion clause. This matches the 5 anchor; the when-clause is concrete, not the merely-present 'when' of the 4 anchor.

Trigger Term Quality

Natural trigger terms are present and well chosen: 'Linux, Wayland, X11, or AT-SPI' in the when-clause, plus 'XWayland', 'remote desktop viewers', and 'Docker/Xpra' in the coverage clause. A few common variations users might say are still missing (e.g., GNOME, VNC, accessibility tree), matching the 'good keyword coverage; a few natural terms missing' anchor rather than the comprehensive 5.

Distinctiveness Conflict Risk

The description occupies a clear niche (Linux backends of one specific remote tool) and actively fences off adjacent skills via 'excludes the internal Docker/Xpra desktop', making wrong-skill triggering unlikely. It fits the 5 anchor's 'clear niche with distinct triggers; minimal conflict risk'; no overlap risk rises to the 4-anchor level.