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langchain-langgraph-checkpointing

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plugins/saas-packs/langchain-py-pack/skills/langchain-langgraph-checkpointing/SKILL.md

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Nov 12, 2026
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# LangGraph Checkpointing (Python)

## Overview

A chat agent that "keeps introducing itself" is almost always P16. The caller
invokes `graph.invoke(state)` without passing `config={"configurable":
{"thread_id": ...}}` — LangGraph's checkpointer silently spawns a fresh state per
call. No error, no warning, no log line. The user sees it; the code does not.

That is one of five separate checkpointing pitfalls this skill covers:

- **P16** — missing `thread_id` silently resets memory
- **P17** — `interrupt_before` raises `TypeError` when state holds non-JSON values
  (`datetime`, `Decimal`, custom classes) — and it raises *at the interrupt
  boundary*, not when the bad value was first assigned, so the traceback points
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