_ensure_message_ids() — langchain Function Reference

Architecture documentation for the _ensure_message_ids() function in summarization.py from the langchain codebase.

Function python LangChainCore MessageInterface called by 2

Entity Profile

LangChainCore→ MessageInterface→ _ensure_message_ids() — langchain Function Reference

Dependency Diagram

graph TD
  bfb2ef4c_03ef_fa38_3c61_04aca1af6ed5["_ensure_message_ids()"]
  a622f56b_f697_966d_5bc7_095699ccca34["SummarizationMiddleware"]
  bfb2ef4c_03ef_fa38_3c61_04aca1af6ed5 -->|defined in| a622f56b_f697_966d_5bc7_095699ccca34
  833a9d39_5a26_a8d9_09c7_26020ad85079["before_model()"]
  833a9d39_5a26_a8d9_09c7_26020ad85079 -->|calls| bfb2ef4c_03ef_fa38_3c61_04aca1af6ed5
  ca36a689_bbb0_72cf_124a_722e38d87df0["abefore_model()"]
  ca36a689_bbb0_72cf_124a_722e38d87df0 -->|calls| bfb2ef4c_03ef_fa38_3c61_04aca1af6ed5
  style bfb2ef4c_03ef_fa38_3c61_04aca1af6ed5 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/langchain/agents/middleware/summarization.py lines 520–524

    def _ensure_message_ids(messages: list[AnyMessage]) -> None:
        """Ensure all messages have unique IDs for the add_messages reducer."""
        for msg in messages:
            if msg.id is None:
                msg.id = str(uuid.uuid4())