Key lives only in this browser; calls go directly to api.anthropic.com. AUTO runs the loop freely
(Stop anytime). STEP asks before every run and %pip install. The agent's code runs in the same
Pyodide sandbox as yours — no filesystem, no network. Long sessions self-compact to fit the
model's context window (~200k tokens; oldest tool exchanges drop first — hover the meter to
see the live estimate). Hover any of your messages and press ⑂ to fork the conversation into
a duplicated notebook.