langchain Architecture Docs
Home / Class/ FirstMiddleware Class — langchain Architecture

FirstMiddleware Class — langchain Architecture

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

Class python

Entity Profile

Dependency Diagram

graph TD
  a587a76a_bcbd_0764_4072_67dfcb7a7f53["FirstMiddleware"]
  949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e["AgentMiddleware"]
  a587a76a_bcbd_0764_4072_67dfcb7a7f53 -->|extends| 949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e
  18e85ff8_9a5d_f800_f722_027398dc89e7["BaseTool"]
  a587a76a_bcbd_0764_4072_67dfcb7a7f53 -->|extends| 18e85ff8_9a5d_f800_f722_027398dc89e7
  5e05f5a6_3c9a_6b02_08a5_596bf1a6469a["test_tools.py"]
  a587a76a_bcbd_0764_4072_67dfcb7a7f53 -->|defined in| 5e05f5a6_3c9a_6b02_08a5_596bf1a6469a
  f10f8f79_dd39_40f9_113e_bea34d87cfc8["wrap_model_call()"]
  a587a76a_bcbd_0764_4072_67dfcb7a7f53 -->|method| f10f8f79_dd39_40f9_113e_bea34d87cfc8

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py lines 266–282

    class FirstMiddleware(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)
                tools.append(t.name)
                # Remove tool_c
                if t.name != "tool_c":
                    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 FirstMiddleware class?
FirstMiddleware is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py.
Where is FirstMiddleware defined?
FirstMiddleware is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_tools.py at line 266.
What does FirstMiddleware extend?
FirstMiddleware extends AgentMiddleware, BaseTool.

Analyze Your Own Codebase

Get architecture documentation, dependency graphs, and domain analysis for your codebase in minutes.

Try Supermodel Free