langgraph-python-checkpointer

LangGraph Python checkpointer attribution

This example runs a real Python langgraph==1.2.4 StateGraph compiled with InMemorySaver, then signs each checkpointer event as a hash-only atrib record.

Run it from the repo root:

pnpm --filter @atrib/integration langgraph-python-checkpointer-smoke

What the smoke proves:

• A real Python StateGraph can run with compile(checkpointer=InMemorySaver()).
• The checkpointer emits real get_tuple, put, and put_writes calls during one thread execution.
• The smoke signs one atrib record for each checkpointer event.
• The signed records chain through chain_root and informed_by.
• Public records carry only hashes, operation names, signatures, and chain data.
• Raw checkpoint state, writes, task ids, and the private note stay in local sidecars.

What it does not prove yet:

• LangGraph Platform deployment behavior.
• Postgres, Redis, or other production checkpointer backends.
• LangChain model calls, external tools, or hosted persistence.
• A current LangChain or LangGraph review target.

The integration point is intentionally narrow: sign the checkpointer boundary so a stateful agent can prove which checkpoint transitions happened without publishing the private state.