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before_model() — langchain Function Reference

Architecture documentation for the before_model() function in test_middleware_typing.py from the langchain codebase.

Function python LangChainCore LanguageModelBase calls 1 called by 1

Entity Profile

Dependency Diagram

graph TD
  6da020a2_43a2_7603_b53a_4d95dafc06e3["before_model()"]
  3c3b5386_19a6_3675_81a6_f2b04cf3c889["UserContextMiddleware"]
  6da020a2_43a2_7603_b53a_4d95dafc06e3 -->|defined in| 3c3b5386_19a6_3675_81a6_f2b04cf3c889
  ac0a228c_341d_f10a_26cf_b94cfdb9608c["before_model()"]
  ac0a228c_341d_f10a_26cf_b94cfdb9608c -->|calls| 6da020a2_43a2_7603_b53a_4d95dafc06e3
  ac0a228c_341d_f10a_26cf_b94cfdb9608c["before_model()"]
  6da020a2_43a2_7603_b53a_4d95dafc06e3 -->|calls| ac0a228c_341d_f10a_26cf_b94cfdb9608c
  style 6da020a2_43a2_7603_b53a_4d95dafc06e3 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_typing.py lines 119–125

    def before_model(
        self, state: AgentState[Any], runtime: Runtime[UserContext]
    ) -> dict[str, Any] | None:
        # Full type safety - IDE knows these fields exist
        _user_id: str = runtime.context["user_id"]
        _user_name: str = runtime.context["user_name"]
        return None

Domain

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Defined In

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Called By

Source

Frequently Asked Questions

What does before_model() do?
before_model() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_typing.py.
Where is before_model() defined?
before_model() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_typing.py at line 119.
What does before_model() call?
before_model() calls 1 function(s): before_model.
What calls before_model()?
before_model() is called by 1 function(s): before_model.

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