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## Summary - Add `LANGGRAPH_STRICT_MSGPACK=true` guidance to `JsonPlusSerializer` docstring and inline comments - Update the warning message emitted for unregistered types to mention the env var - Add module docstring to `_msgpack.py` explaining the safety controls - Add Security sections to checkpoint, checkpoint-postgres, and checkpoint-sqlite READMEs ## Context Multiple security advisories have reported the same msgpack deserialization pattern (`ext_hook` → `importlib.import_module` → `getattr` → call). The underlying behavior is documented in the repo's threat model as T1, but the `LANGGRAPH_STRICT_MSGPACK` env var that mitigates it is not surfaced in user-facing docs, docstrings, or warning messages. This PR closes that gap. ## Test plan - [x] Verify READMEs render correctly on GitHub (callout boxes use `> [!IMPORTANT]` syntax) - [x] Verify `JsonPlusSerializer` docstring renders in IDE tooltips - [x] Confirm warning message format: `LANGGRAPH_STRICT_MSGPACK=true PYTHON_CMD 2>&1 | grep -i strict` --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>