Conciseness

The body is dense with non-obvious domain guidance (grounding route selection, aspect-ratio coordinate scaling, keyframe observation) and mostly avoids padding. Minor over-explanation could be trimmed, e.g. the speech/robotics timing comparison in '循环节奏与尺度' and the ad-monetization digression in '生态壁垒'. Not 5: these tangential passages cost tokens without adding operational guidance; not 3: nearly every line carries skill-specific knowledge rather than concepts Claude already knows.

Actionability

Concrete guidance is present: the four-step browser-use flow ('CDP 取 DOM → 检测可交互元素 → 标注唯一 ID 并在截图绘边界框 → 同步生成…文本列表') and a numeric scaling example ('2560×1440 的 16:9 屏幕选 FWXGA 1366×768，模型返回 (683,384) 反推真实坐标约 (1280,720)'). Not 5: there is no executable code in the body itself, and steps like '实现坐标缩放层：枚举目标模型支持的分辨率档位' remain high-level; not 3: the guidance goes well beyond vague direction with specific procedures and worked numbers.

Workflow Clarity

'实践模式' provides a clear 8-step build sequence with validation checkpoints ('验收要测量效率…记录真实运行证据', '保留每步截图与动作轨迹，便于回放和验收') and an explicit error-recovery loop ('恢复策略要预置'). Not 5: the numbered list contains a numbering error (two items labeled '6'), and several steps are parallel topic areas rather than a strictly checkpointed sequence; not 3: validation and feedback loops for the risky (irreversible-operation) parts are explicitly present.

Progressive Disclosure

Sections are well-organized (何时使用 / 核心原则 / 实践模式 / 常见陷阱 / 配套代码 / 深度阅读) with dedicated pointer sections, but every referenced path — 'chapter6/claude-computer-use-native/', 'chapter6/computer-use-open-model/', 'book/chapter6.md', and the 'validation/ 目录' — does not exist in the skill bundle (no references/, scripts/, or assets/ directories are present). Not 4: navigation to the referenced material is broken within the bundle; not 2: the SKILL.md itself is appropriately structured and the pointers are clearly signaled.

Specificity

The description enumerates concrete, specific capabilities: '感知-思考-行动循环、动作空间（GUI/bash/文件编辑）、视觉定位 Grounding 三条路线（结构化元素索引、Set-of-Mark、纯坐标预测）、分辨率坐标缩放、关键帧观察接口、世界模型与移动端生态壁垒' — multiple specific items with comprehensive domain coverage. Not 4: there are no meaningful coverage gaps in the capability list.

Completeness

Both 'what' (the enumerated coverage list) and 'when' ('构建 GUI 自动化 Agent…时使用' plus an explicit 触发词 list) are clearly and explicitly stated with concrete trigger phrases. Not 4: the 'when' clause is fully explicit, not merely present.

Trigger Term Quality

Nine explicit trigger terms ('Computer Use、GUI 自动化、截图、Grounding、browser-use、Set-of-Mark、视觉定位、坐标缩放、OSWorld') cover natural user phrasing across both Chinese and English, including framework and benchmark names plus synonyms (视觉定位/Grounding). Not 4: coverage is comprehensive rather than merely good.

Distinctiveness Conflict Risk

The niche (GUI automation agents / computer use) is clear and mostly distinct, but the generic trigger '截图' (screenshot) could overlap with image-analysis or screen-capture-adjacent skills. Not 5: minor overlap risk from this broad term; not 3: the domain is far more specific than a generic 'works with X files' skill.