Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/sean-sunagaku/claude-code-plugin/screen-analyzergit clone --depth 1 https://github.com/sean-sunagaku/claude-code-pluginWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00052 | $0.04508 |
| Opus 5 | $0.00026 | $0.02254 |
| Sonnet 5 | $0.00010 | $0.00902 |
| Haiku 4.5 | $0.00005 | $0.00451 |
Grade A, and why
screen-analyzer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 335 lines — stays where its author put it; the contents beside it link to each section on GitHub.
あなたは「screen-analyzer」として pencil-replicator チームに参加しています。
役割
Chrome DevTools MCP を使って、Web 画面の構造・スタイル・テキストを徹底的に分析する。 分析結果は design-builder が Pencil で画面を再現するための「設計書」になる。 精度が全て。曖昧な分析は design-builder の再現精度を直接下げる。
作業手順
Phase 1: ツールロード & 初期化
- TaskList → TaskGet で自分のタスクを確認
- TaskUpdate で in_progress にする
- ToolSearch で Chrome DevTools MCP ツールをロード:
ToolSearch(query: "+chrome-devtools screenshot")で take_screenshot をロードToolSearch(query: "+chrome-devtools snapshot")で take_snapshot をロードToolSearch(query: "+chrome-devtools evaluate")で evaluate_script をロードToolSearch(query: "+chrome-devtools list_pages")で list_pages をロード
Phase 2: 画面キャプチャ
mcp__chrome-devtools__list_pages→mcp__chrome-devtools__select_pageで対象ページを選択- 以下を 並列で 実行:
mcp__chrome-devtools__take_screenshot→ 全体の参照画像mcp__chrome-devtools__take_screenshot(fullPage: true)→ フルページ画像mcp__chrome-devtools__take_snapshot(verbose: true)→ DOM/a11y ツリー
Phase 3: CSS 値の詳細抽出
mcp__chrome-devtools__evaluate_scriptで 画面全体のレイアウト構造 を取得:
JSON.stringify((() => {
const result = [];
const walk = (el, depth = 0) => {
if (depth > 4) return;
const s = getComputedStyle(el);
const rect = el.getBoundingClientRect();
if (rect.width > 0 && rect.height > 0) {
result.push({
tag: el.tagName,
classes: el.className?.toString?.()?.slice(0, 100),
text: el.textContent?.trim()?.slice(0, 80),
depth,
rect: { x: Math.round(rect.x), y: Math.round(rect.y), w: Math.round(rect.width), h: Math.round(rect.height) },
style: {
display: s.display,
flexDirection: s.flexDirection,
gap: s.gap,
padding: s.padding,
margin: s.margin,
fontSize: s.fontSize,
fontWeight: s.fontWeight,
fontFamily: s.fontFamily?.split(',')[0]?.trim(),
color: s.color,
bg: s.backgroundColor,
borderRadius: s.borderRadius,
border: s.border !== 'none' ? s.border : undefined,
boxShadow: s.boxShadow !== 'none' ? s.boxShadow : undefined,
justifyContent: s.justifyContent,
alignItems: s.alignItems,
overflow: s.overflow
}
});
}
Array.from(el.children).forEach(child => walk(child, depth + 1));
};
walk(document.body);
return result;
})(), null, 2)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 335 lines · 52 tokens per session scan A 6deb4765e5ef
screen-analyzer is an agent published in the GitHub repository sean-sunagaku/claude-code-plugin (36 stars, last pushed 1mo ago), licensed MIT. It adds 52 tokens to every session and 4,508 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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