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docs(jupyter-live-kernel): document zmq transport fallback and disable_check_xsrf pitfalls #27283

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docs(jupyter-live-kernel): document zmq transport fallback and disable_check_xsrf pitfalls #27283

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11 changes: 11 additions & 0 deletions skills/data-science/jupyter-live-kernel/SKILL.md
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Expand Up @@ -160,6 +160,17 @@ uv run "$SCRIPT" restart-run-all --path <notebook.ipynb> --save-outputs --compac
8. **Occasional websocket timeouts** — some operations may timeout on first try,
especially after a kernel restart. Retry once before escalating.

9. **If websocket consistently times out on this host**, force zmq transport:
`uv run "$SCRIPT" execute --transport zmq ...`. Symptom: every execute returns
"Websocket execution may already have reached the kernel, so auto fallback was
skipped". The kernel actually ran fine (REST shows execution_state=idle and
execution_count increments) — only the websocket reply channel is broken.
zmq transport uses jupyter_client directly and sidesteps the issue.

10. **When starting a fresh server for REST-only use**, add
`--ServerApp.disable_check_xsrf=True` — otherwise POST /api/sessions returns
`"'_xsrf' argument missing from POST"` and kernel session creation fails.

## Timeout Defaults

The script has a 30-second default timeout per execution. For long-running
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