before_model() — langchain Function Reference

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

Function python LangChainCore LanguageModelBase called by 1

Entity Profile

LangChainCore→ LanguageModelBase→ before_model() — langchain Function Reference

Dependency Diagram

graph TD
  e9c0ce14_d33f_7641_2350_cd379e713bff["before_model()"]
  be0b0f4a_a727_78cd_c887_3f6b96270b40["TestMiddleware"]
  e9c0ce14_d33f_7641_2350_cd379e713bff -->|defined in| be0b0f4a_a727_78cd_c887_3f6b96270b40
  e32d9518_c1c6_4111_a89b_531324fd85bb["test_state_schema_with_middleware()"]
  e32d9518_c1c6_4111_a89b_531324fd85bb -->|calls| e9c0ce14_d33f_7641_2350_cd379e713bff
  style e9c0ce14_d33f_7641_2350_cd379e713bff fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/test_state_schema.py lines 129–131

        def before_model(self, state: MiddlewareState, runtime: Runtime) -> dict[str, Any]:
            middleware_calls.append(state["middleware_data"])
            return {}