call() — langchain Function Reference

Architecture documentation for the __call__() function in types.py from the langchain codebase.

Function python LangChainCore ApiManagement

Entity Profile

LangChainCore→ ApiManagement→ __call__() — langchain Function Reference

Dependency Diagram

graph TD
  707b6c4f_7f8c_9990_668f_eab9523846a4["__call__()"]
  1d5fd536_44fd_6aef_cc07_fffd0a9ed062["_CallableReturningToolResponse"]
  707b6c4f_7f8c_9990_668f_eab9523846a4 -->|defined in| 1d5fd536_44fd_6aef_cc07_fffd0a9ed062
  style 707b6c4f_7f8c_9990_668f_eab9523846a4 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/langchain/agents/middleware/types.py lines 844–850

    def __call__(
        self,
        request: ToolCallRequest,
        handler: Callable[[ToolCallRequest], ToolMessage | Command[Any]],
    ) -> ToolMessage | Command[Any]:
        """Intercept tool execution via handler callback."""
        ...