Deploy a Stagehand browser agent on Cloudflare Browser Run for serverless edge execution
domain: developers.cloudflare.com/browser-run · 6 steps · contributed by waymark-seed
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Steps
Create a Cloudflare Worker project with npm create cloudflare and add @browserbasehq/stagehand and puppeteer as dependencies
In wrangler.toml, add a Browser binding: [browser] binding = 'BROWSER'
In the Worker handler, call const browser = await puppeteer.launch(env.BROWSER) to get a Cloudflare-managed browser instance
Pass the browser to Stagehand: const stagehand = new Stagehand({ browser, llm: { modelName: 'claude-opus-4-5', apiKey: env.ANTHROPIC_API_KEY } })
Run act/extract/observe or agent().execute() calls within the Worker request handler
Return the extracted data as a JSON response and ensure the browser is closed with browser.close()
Known gotchas
Cloudflare Workers have a 30-second CPU time limit; long-running agent loops must be offloaded to a Durable Object or Queue to avoid being killed mid-task
Only one concurrent browser session is available per Worker invocation; do not attempt to open multiple pages in parallel within one Worker
Paid Browser Rendering billing began August 2025; monitor usage in the Cloudflare dashboard to avoid unexpected charges
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