before_model() — langchain Function Reference

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

Function python LangChainCore LanguageModelBase calls 1 called by 3

Entity Profile

LangChainCore→ LanguageModelBase→ before_model() — langchain Function Reference

Dependency Diagram

graph TD
  8eb23e9c_37a8_6540_bfd3_b42a64a7cbee["before_model()"]
  a8d1868f_6ff2_5369_173c_c9fc7f2da6be["CustomMiddleware"]
  8eb23e9c_37a8_6540_bfd3_b42a64a7cbee -->|defined in| a8d1868f_6ff2_5369_173c_c9fc7f2da6be
  8d3bffd7_818e_92df_028f_7ddeaca51628["before_model()"]
  8d3bffd7_818e_92df_028f_7ddeaca51628 -->|calls| 8eb23e9c_37a8_6540_bfd3_b42a64a7cbee
  a41c6a20_8b97_0a4a_2b59_d2382a4f2d2f["before_model()"]
  a41c6a20_8b97_0a4a_2b59_d2382a4f2d2f -->|calls| 8eb23e9c_37a8_6540_bfd3_b42a64a7cbee
  79d43dca_0561_c279_c472_317e6bd19324["before_model()"]
  79d43dca_0561_c279_c472_317e6bd19324 -->|calls| 8eb23e9c_37a8_6540_bfd3_b42a64a7cbee
  8d3bffd7_818e_92df_028f_7ddeaca51628["before_model()"]
  8eb23e9c_37a8_6540_bfd3_b42a64a7cbee -->|calls| 8d3bffd7_818e_92df_028f_7ddeaca51628
  style 8eb23e9c_37a8_6540_bfd3_b42a64a7cbee fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_framework.py lines 365–369

        def before_model(self, state: AgentState[Any], runtime: Runtime) -> dict[str, Any]:
            assert "omit_input" not in state
            assert "omit_output" in state
            assert "private_state" not in state
            return {"omit_input": "test", "omit_output": "test", "private_state": "test"}