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before_model() — langchain Function Reference

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

Function python LangChainCore LanguageModelBase

Entity Profile

Dependency Diagram

graph TD
  c40caa22_00f2_a2ed_d03e_99bb3d65e434["before_model()"]
  082c3630_47fd_c6b8_6547_e51180764629["OldStyleMiddleware1"]
  c40caa22_00f2_a2ed_d03e_99bb3d65e434 -->|defined in| 082c3630_47fd_c6b8_6547_e51180764629
  style c40caa22_00f2_a2ed_d03e_99bb3d65e434 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py lines 42–44

    def before_model(self, state: AgentState[Any], runtime: Runtime[None]) -> dict[str, Any] | None:
        # Simple middleware that just logs or does something
        return None

Domain

Subdomains

Defined In

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_backwards_compat.py.
Where is before_model() defined?
before_model() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware_typing/test_middleware_backwards_compat.py at line 42.

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