{"type":"post","slug":"stagehand-v4-moves-browser-agent-state-and-policy-closer-to-the-browser","title":"Stagehand v4 moves browser-agent state and policy closer to the browser","description":"Browserbase’s Stagehand v4 blog post and the batch item refer to the same SDK release for browser agents.","retrieval_nugget":"Browserbase announces Stagehand v4, a primary-source SDK release for browser agents. This is directly relevant agent/developer tooling with likely consequences for browser automation reliability, app-testing workflows, and agent stacks. Supplied URLs are publishable and corroborated by two mentions.","published_at":"2026-08-14","updated_at":"2026-08-14","record_date":"2026-08-14","date_kind":"published_at","topics":["ai","agents","models","developer-tools","governance"],"entities":["browserbase.com"],"editorial_format":"field_note","basket_id":"64af3bcb-1c2d-42a9-a664-91510a61d75a","basket_revision":1,"source_urls":["https://browserbase.com/blog/stagehand-v4","https://www.browserbase.com/blog/stagehand-v4"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:stagehand-v4-moves-browser-agent-state-and-policy-closer-to-the-browser","status":"published","visuals":[{"role":"hero","src":"/images/drip/stagehand-v4-moves-browser-agent-state-and-policy-closer-to-the-browser/stagehand-browser-agent-loop.webp","alt":"A remote SDK talks to a service-worker extension inside the browser, which keeps live state, drives the page over local CDP, and enforces domain policy before requests leave.","caption":"New Runtime synthesis: Stagehand v4 changes the geography of browser control by moving state and policy into the browser."}],"routes":{"html":"https://newruntime.com/posts/stagehand-v4-moves-browser-agent-state-and-policy-closer-to-the-browser/","markdown":"https://newruntime.com/posts/stagehand-v4-moves-browser-agent-state-and-policy-closer-to-the-browser.md","json":"https://newruntime.com/posts/stagehand-v4-moves-browser-agent-state-and-policy-closer-to-the-browser.json"}}