before_model() — langchain Function Reference

Architecture documentation for the before_model() function in test_injected_runtime_create_agent.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
  a7926c87_146a_18d7_fbc4_3911991d3131["before_model()"]
  b33b7e95_8cbe_3b00_6fa1_08add218b8fb["TestMiddleware"]
  a7926c87_146a_18d7_fbc4_3911991d3131 -->|defined in| b33b7e95_8cbe_3b00_6fa1_08add218b8fb
  d22a3b62_c720_71e5_3b39_91b2c6093b93["test_tool_runtime_with_middleware()"]
  d22a3b62_c720_71e5_3b39_91b2c6093b93 -->|calls| a7926c87_146a_18d7_fbc4_3911991d3131
  style a7926c87_146a_18d7_fbc4_3911991d3131 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/test_injected_runtime_create_agent.py lines 470–472

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