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SystemPromptMiddleware Class — langchain Architecture

Architecture documentation for the SystemPromptMiddleware class in test_wrap_model_call.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  c2148a8d_7568_684c_7068_b5c1b860a4fc["SystemPromptMiddleware"]
  949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e["AgentMiddleware"]
  c2148a8d_7568_684c_7068_b5c1b860a4fc -->|extends| 949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e
  573473e5_eb93_a7d7_84ba_c975071c09af["test_wrap_model_call.py"]
  c2148a8d_7568_684c_7068_b5c1b860a4fc -->|defined in| 573473e5_eb93_a7d7_84ba_c975071c09af
  9792895d_07e6_96c0_bc7a_7b0b492d7ffc["__init__()"]
  c2148a8d_7568_684c_7068_b5c1b860a4fc -->|method| 9792895d_07e6_96c0_bc7a_7b0b492d7ffc
  fd0d58c6_3288_3ef1_90fd_948615c50be3["wrap_model_call()"]
  c2148a8d_7568_684c_7068_b5c1b860a4fc -->|method| fd0d58c6_3288_3ef1_90fd_948615c50be3

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py lines 566–589

        class SystemPromptMiddleware(AgentMiddleware):
            def __init__(self, system_prompt: str):
                super().__init__()
                self.system_prompt = system_prompt

            def wrap_model_call(
                self,
                request: ModelRequest,
                handler: Callable[[ModelRequest], ModelResponse],
            ) -> ModelCallResult:
                # Modify request to add system prompt
                modified_request = ModelRequest(
                    model=request.model,
                    system_prompt=self.system_prompt,
                    messages=request.messages,
                    tools=request.tools,
                    tool_choice=request.tool_choice,
                    response_format=request.response_format,
                    model_settings=request.model_settings,
                    state=request.state,
                    runtime=request.runtime,
                )
                received_requests.append(modified_request)
                return handler(modified_request)

Defined In

Extends

Source

Frequently Asked Questions

What is the SystemPromptMiddleware class?
SystemPromptMiddleware is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py.
Where is SystemPromptMiddleware defined?
SystemPromptMiddleware is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_wrap_model_call.py at line 566.
What does SystemPromptMiddleware extend?
SystemPromptMiddleware extends AgentMiddleware.

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