## 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>
This syncs the checkpoint interface specification with the base class
(`BaseCheckpointSaver`) in
`langgraph/libs/checkpoint/langgraph/checkpoint/base /__init__.py`.
- Instead store sends in a Topic channel, removing the need to fetch sends as writes against the parent checkpoint
- Remove deprecated/unused functions in langgraph-checkpoint (will require bumping min range for langgraph-checkpoint in langgraph lib)
- Implement migration of old pending sends in langgraph-checkpoint-postgres
- Ensure parent config of `checkpoint_during=False` checkpoints always points to checkpoints that were also saved
