Who it is forA researcher or analyst who needs a checked answer from a live web page and must show where each fact came from.
The problemReading a page by hand takes time, and it is hard to prove which text supports each fact.
The outcomeA short answer in which each factual claim carries a verbatim quote from the page, with the step count and cost of the run.
What you need first
- uv, which fetches Python 3.13 or newer
- OPENROUTER_API_KEY, or AI_GATEWAY_API_KEY for the Vercel AI Gateway
- BROWSER_USE_API_KEY for the default cloud browser, or the --local flag for local Chrome
Steps
uv tool install fastbrowseexport OPENROUTER_API_KEY=...export BROWSER_USE_API_KEY=...uvx fastbrowse "What is the title of the top story right now?" --start https://news.ycombinator.com/- Add
--jsonto the same command to print every step and the quotes behind the answer.
Prompt for your agent
Use the fastbrowse repo to answer <question> about the page at <start URL>. Run `uvx fastbrowse "<question>" --start <start URL> --json` and return the answer with its quotes. Verify that each factual claim in the answer matches a quote from the page.
Caveat. Default runs use a Browser Use Cloud browser and paid model calls, so each run has a cost and a bounded run needs --max-steps or --max-dollars.
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