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SecondMiddleware Class — langchain Architecture

Architecture documentation for the SecondMiddleware class in test_tools.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  f4fb523a_f2ec_5df1_98bb_9e45d358ec38["SecondMiddleware"]
  949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e["AgentMiddleware"]
  f4fb523a_f2ec_5df1_98bb_9e45d358ec38 -->|extends| 949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e
  18e85ff8_9a5d_f800_f722_027398dc89e7["BaseTool"]
  f4fb523a_f2ec_5df1_98bb_9e45d358ec38 -->|extends| 18e85ff8_9a5d_f800_f722_027398dc89e7
  5e05f5a6_3c9a_6b02_08a5_596bf1a6469a["test_tools.py"]
  f4fb523a_f2ec_5df1_98bb_9e45d358ec38 -->|defined in| 5e05f5a6_3c9a_6b02_08a5_596bf1a6469a
  55b56038_90e1_3956_3f9e_4c88e7180d41["wrap_model_call()"]
  f4fb523a_f2ec_5df1_98bb_9e45d358ec38 -->|method| 55b56038_90e1_3956_3f9e_4c88e7180d41

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py lines 284–302

    class SecondMiddleware(AgentMiddleware):
        def wrap_model_call(
            self,
            request: ModelRequest,
            handler: Callable[[ModelRequest], ModelResponse],
        ) -> ModelCallResult:
            tools: list[str] = []
            filtered_tools: list[BaseTool | dict[str, Any]] = []
            for t in request.tools:
                assert isinstance(t, BaseTool)
                # Should not see tool_c here
                assert t.name != "tool_c"
                tools.append(t.name)
                # Remove tool_b
                if t.name != "tool_b":
                    filtered_tools.append(t)
            modification_order.append(tools)
            request = request.override(tools=filtered_tools)
            return handler(request)

Defined In

Extends

Source

Frequently Asked Questions

What is the SecondMiddleware class?
SecondMiddleware is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py.
Where is SecondMiddleware defined?
SecondMiddleware is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py at line 284.
What does SecondMiddleware extend?
SecondMiddleware extends AgentMiddleware, BaseTool.

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