ViewportWitness by Apex Labs

Tools

Token cost is the o200k count of the tools list JSON, including schemas, before any tool is called.

• check_page

  Choose this for broad website testing when the caller wants screenshots, responsive layout checks, accessibility findings, console/network errors, performance evidence, and a release diagnosis across

• verify_page

  Choose this only when the caller supplies explicit website assertions that need pass/fail results across three viewports. For broad exploratory browser QA use check_page instead. Assertion types: noHo

• compare_page

  Choose this for visual regression testing after check_page has produced a completed, unexpired baseline. Compares screenshots and QA evidence, returning pixel-diff percentages, new or resolved accessi

• extract_page

  Choose this when an agent needs the readable content of a public webpage as deterministic clean Markdown, without screenshots or browser execution. Costs $0.005 USDC via x402. Successful paid calls se

• web_release_gate

  Choose this for a passive website release-security review of headers, cookie flags, mixed content, cross-origin script integrity, and server disclosure. It does not run browser QA, probe the site, exe

• get_report

  Retrieve a submitted job without paying again. Free and read-only. Poll the same job ID until jobStatus is complete, a terminal report status PASS/FAIL/INCONCLUSIVE, or job status failed/retryable. Br