v0.8.3

Added

• Experimental browser-backed RPC transport (NOTEBOOKLM_RPC_TRANSPORT=cdp) — Routes normal batchexecute RPCs and notebook chat through fetch inside the saved NotebookLM browser profile so Chrome supplies live browser-bound cookies. Off by default; use only when nlm doctor auth-replay shows cdp_in_page succeeds but normal replay fails. See docs/AUTHENTICATION.md for usage.
• CDP transport support for notebook chat — GenerateFreeFormStreamed queries are routed through the experimental CDP transport when the flag is enabled, with longer CDP response waits to handle long answers.
• Tests for CDP transport — Focused tests for transport routing, streamed query routing, long CDP timeouts, and browser lifecycle cleanup.

Fixed

• MCP notebook_query cancellation crash — The query tool is now async and dispatches blocking I/O to a thread via anyio.to_thread.run_sync with abandon_on_cancel=True, so MCP client cancellation no longer leaves the server in an inconsistent state.

Changed

• nlm doctor auth-replay CDP probe uses the shared fetch helper — The diagnostic path now exercises the same fetch_form_in_page helper used by the real experimental transport, keeping the two code paths consistent.
• execute_cdp_command accepts a response_timeout parameter — The default 30 s WebSocket wait is now configurable so long-running in-page fetches (e.g. streamed notebook queries) do not time out prematurely.
• find_existing_nlm_chrome accepts include_headless — Interactive login keeps the existing False default; the browser-backed RPC transport passes True to reuse profile-owned headless browsers.

Notes

Use nlm doctor auth-replay first. Only try NOTEBOOKLM_RPC_TRANSPORT=cdp when normal replay fails but cdp_in_page passes. Uploads, downloads, and artifact file transfers still use the existing HTTP paths.