Stagehand

Stagehand is an open-source SDK that mixes ordinary Playwright code with natural-language actions. You can write act, extract and observe commands, so parts of a script are deterministic and parts adapt to page changes.

That mix is the point. Pure code breaks when a site changes, while pure agents are slow and unpredictable. Using each where it fits makes automations sturdier.

It is built by the Browserbase team and runs best with their hosted browsers, though it works locally as well.