after_agent() — langchain Function Reference

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

Function python LangChainCore MessageInterface calls 1 called by 1

Entity Profile

LangChainCore→ MessageInterface→ after_agent() — langchain Function Reference

Dependency Diagram

graph TD
  20e9268c_1ce4_5e5b_e0bf_32f0d2aa7f8e["after_agent()"]
  949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e["AgentMiddleware"]
  20e9268c_1ce4_5e5b_e0bf_32f0d2aa7f8e -->|defined in| 949c7cf4_56fe_f3b4_cd89_9631a7e9cb1e
  f5377bf2_2aeb_e96b_eea2_47b6e1c332d1["after_agent()"]
  f5377bf2_2aeb_e96b_eea2_47b6e1c332d1 -->|calls| 20e9268c_1ce4_5e5b_e0bf_32f0d2aa7f8e
  f5377bf2_2aeb_e96b_eea2_47b6e1c332d1["after_agent()"]
  20e9268c_1ce4_5e5b_e0bf_32f0d2aa7f8e -->|calls| f5377bf2_2aeb_e96b_eea2_47b6e1c332d1
  style 20e9268c_1ce4_5e5b_e0bf_32f0d2aa7f8e fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/langchain/agents/middleware/types.py lines 625–634

    def after_agent(self, state: StateT, runtime: Runtime[ContextT]) -> dict[str, Any] | None:
        """Logic to run after the agent execution completes.

        Args:
            state: The current agent state.
            runtime: The runtime context.

        Returns:
            Agent state updates to apply after agent execution.
        """