Browser Runtimes
Browser automation now starts from a workspace, not from a root browser client.
Start a profile-backed runtime
Start an ephemeral runtime
Start an ephemeral runtime with config
Work with the runtime
Long-running agents
Use the same runtime for long-running agent calls:
Related references
- Browser capability reference covers
page.goto,locator.click, event listeners, Stagehand, and browser-use. - API reference covers workspaces, runtimes, operations, artifacts, and browser profiles.

