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Instant 360-degree page health check: evaluates console runtime errors, failed network requests, horizontal layout overflow (scrollbars), broken images, WCAG 2.1 AA accessibility (unlabelled buttons/inputs, duplicate IDs), Core Web Vitals, and SEO. In-page DOM audits work across Chromium and Firefox in both modes; console and network capture require active DevTools capture sessions. Returns a health score (0-100), letter grade, and actionable element refs [ref=e12].
The tool names stay the same across browsers. See browser selection and Firefox and Zen exceptions before choosing an operation.
Runs in-page checks for layout overflow, broken images, WCAG accessibility, and SEO across Chromium and Firefox in both modes. Console runtime errors and network requests are inspected from active DevTools capture sessions (available in Chromium and developer-mode Firefox; Firefox extension mode does not support native capture sessions).

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Parameters

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integer
Target tab id from browser_tabs, which lists tabs across all windows. Defaults to the agent’s most recently opened usable tab, or the only usable tab. Otherwise select a listed tabId.
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enum[]
Categories to audit (default: all) Items: errors, network, layout, accessibility, performance, security, seo.
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enum
default:"all"
required
Filter findings: “all” (all items), “warnings” (warnings and errors), or “errors” (errors only) One of: all, warnings, errors.
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boolean
Return scores and counts without individual item details
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boolean
default:"true"
required
Save diagnostic report artifact (default: true)

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Example

Full 360-degree health audit of the active page
Check responsive layout and accessibility only
Errors only