Introducing Stagehand v4: The SDK for browser agents.

Stagehand v4 redesigns the browser automation framework by moving target management, browser state tracking, frame and execution-context handling, and Chrome DevTools Protocol dispatch from client SDKs into a browser extension that runs alongside the page. This architecture aims to reduce stale-state and race-condition failures common with remote browsers, enable domain policies to block requests and pop-ups before they leave the browser, and provide TypeScript, Python, and Go SDKs with feature parity through thin RPC clients. By operating on the live browser state, v4 also prunes page context more efficiently for AI models, reduces SDK dependencies, and can execute command sequences without repeated network round trips. In one reported 50-action remote Wikipedia crawl, Stagehand completed the sequence in about 14.2 seconds versus Playwright’s 22.7 seconds, though the authors characterize this as a single measurement rather than a general benchmark. Security controls enforce domain policies at the in-browser request level to limit risks such as prompt-injection-driven data exfiltration, while communication uses authenticated CDP connections and JSON messages between SDKs and the extension service worker. Stagehand v4 is preinstalled on Browserbase browsers, supports local Chromium through extension loading, remains broadly compatible with v3 scripts, and enables capabilities such as WebMCP and direct clipboard interaction.

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