Conciseness

The ~48-line body is dense and padding-free: no explanations of concepts Claude already knows, just rules, exact commands ('scripts/capture.mjs <url> <out.png>'), viewport sizes (1600×900, 390×844), and settle timings. Even the rhetorical lines ('A screenshot mentioned but not sent doesn't count') enforce a rule rather than pad.

Actionability

Commands are mostly copy-paste ready ('scripts/compare.py out.jpg before.png "Before" after.png "After"') with concrete flags and values, but 'JS steps to click, open or scroll' never specifies how those steps are passed to capture.mjs — a minor executable gap that fits the 'minor gaps' anchor rather than the fully-copy-paste-ready 5.

Workflow Clarity

The sequence (capture each pass → inspect every image → caption → send → final report) is explicit and includes a real validate→fix loop: 'Look at every image before sending' with a concrete recapture checklist (stray toasts, half-loaded art, wrong scene), plus error surfacing in the capture tool.

Progressive Disclosure

A sub-50-line body with clean sections (Rules, How to capture, In the final report) and two script references (capture.mjs, compare.py) that are real files used as executable tools rather than nested documentation — one level deep, clearly signaled, well organized, which fits the simple-skill top anchor.

Specificity

The description lists multiple concrete actions — 'Capture the start, the key moment and the result of every visual change, send them as files with captions as soon as each is ready, and look at every image before sending it' — covering the skill comprehensively with no gaps, matching the top anchor rather than the 'minor gaps' of 4.

Completeness

It explicitly answers both what (capture start/key-moment/result, send as captioned files, review before sending) and when ('Use on any task with a visible result… when the user says…') with concrete trigger phrases, matching the top anchor exactly.

Trigger Term Quality

It quotes verbatim user phrases — "show me", "screenshots", "keep giving me screenshots", "where are the screenshots?" — alongside domain terms (UI, pages, games, 3D, charts, motion), giving comprehensive natural-term coverage including synonyms and exact user utterances.

Distinctiveness Conflict Risk

A clear niche — unsolicited in-progress screenshots of visual work — with distinct triggers; the quoted user requests would not naturally fire for other skills. The 4 anchor ('minor overlap risk') was considered for the 'charts'/'motion' tokens shared with viz-related skills, but the distinct action keeps conflict risk minimal.