flowchart TB
    START((输入)) --> CTX["Context 管理"]
    CTX --> LLM["LLM 流式输出"]
    LLM --> TC{tool_use?}

    TC --> |是| EXEC["执行工具"]
    EXEC --> CTX

    TC --> |否| DONE((完成))

    classDef proc fill:#eef,stroke:#66c,color:#224
    classDef decision fill:#fee,stroke:#c66,color:#422
    classDef io fill:#eff,stroke:#6cc,color:#244

    class CTX,LLM,EXEC proc
    class TC decision
    class START,DONE io