---
tags: [agent-loop, mermaid, claude-code, 流程图]
create time: 2026-06-09 22:30
---

# Agent Loop 完整流程

## 概述

Claude Code Agent 的完整执行循环，包含 Context 管理、Pre/Post-sampling Hook、权限审批、工具并发执行、子 Agent 递归调用、Stop Hook 和 Token Budget 控制等全部环节。

## 正文

```mermaid
flowchart TB
    START(("输入")) --> CTX["Context 管理"]
    CTX --> PRE["Pre-sampling Hook"]
    PRE --> LLM["LLM 流式输出"]
    LLM --> TC{"tool_use?"}

    TC --> |是| PERM{"需权限?"}
    PERM --> |是| USER["用户审批"]
    USER --> |allow| TOOL_PRE
    USER --> |deny| DENIED["拒绝"]
    PERM --> |否| TOOL_PRE["Pre-tool Hook"]
    TOOL_PRE --> EXEC["并发执行工具"]
    EXEC --> TOOL_POST["Post-tool Hook"]
    TOOL_POST --> CTX
    DENIED --> CTX

    TC --> |否| POST["Post-sampling Hook"]
    POST --> STOP{"Stop Hook"}
    STOP --> |不通过| CTX
    STOP --> |通过| BUDGET{"Token Budget"}
    BUDGET --> |继续| CTX
    BUDGET --> |完成| DONE(("完成"))

    subgraph SUB["子 Agent"]
        FORK["AgentTool"] --> RECURSE["递归调用"]
    end

    EXEC -.-> FORK

    classDef proc fill:#eef,stroke:#66c,color:#224
    classDef decision fill:#fee,stroke:#c66,color:#422
    classDef hook fill:#ffe,stroke:#cc6,color:#442
    classDef io fill:#eff,stroke:#6cc,color:#244
    classDef sub fill:#efe,stroke:#6a6,color:#242

    class CTX,LLM,EXEC proc
    class TC,PERM,STOP,BUDGET decision
    class PRE,TOOL_PRE,TOOL_POST,POST hook
    class START,DONE,USER,DENIED io
    class FORK,RECURSE sub
```

## 关联笔记

- [[agent-loop-simple]] - Agent Loop 简易流程