browser-use shipped a harness where the agent patches its own browser helpers mid-task.

browser-use/browser-harness is a deliberately thin layer over the Chrome DevTools Protocol where the agent writes and edits its own helper functions at runtime. When it hits a missing capability (file upload is the canonical example), it edits the harness code and adds the function instead of erroring. They call it self-healing. ~15,900 stars, runs against local Chrome, stealth browsers, or a hosted Browser Use Box, with a JS sibling. The design bet: a minimal CDP bridge plus a code-writing agent beats a rigid, pre-enumerated automation API. Read it next to the TTHE paper. Same thesis, one written in C-suite prose and one in Python.