基线:全量源码首提(D1 版本控制落地,含第一轮优化 B1-B4/A1/A4/缩放修复)

2026-10-01 22:15:22 +08:00
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+# Screenshots
+
+This is lookup-only guidance. Do not use it for ordinary navigation, reading, search, or form interaction when a DOM snapshot answers the question.
+
+Capture a screenshot only when the user explicitly requests one, visual layout/rendering/image content must be judged, or the required target is absent from the DOM snapshot. Do not request a snapshot and screenshot together by default.
+
+`await tab.screenshot(opts?)` returns PNG bytes as `Uint8Array` internally. Those bytes are not a model-visible screenshot and must never be returned as the JS result.
+
+Every screenshot call must pass the bytes to `nodeRepl.emitImage` in the same JS cell so the tool returns a standard image content block:
+
+```js
+nodeRepl.emitImage(await tab.screenshot());
+```
+
+Never use `await tab.screenshot()` as the final expression.
+
+Supported screenshot options:
+
+- `{ fullPage: true }` captures the whole page.
+- `{ clip: { x, y, width, height } }` captures a viewport region.
+
+If a screenshot times out, do not immediately issue the same screenshot again. The underlying Chromium
+capture may still be completing; wait before retrying, or reopen the tab if the explicit in-flight error
+does not clear.