[问题/Issue] 章节7：图 7.1中工具调用流程是简化还是有误

### 1. 遇到问题的章节 / Affected Chapter Chapter 7 ### 2. 问题类型 / Issue Type 文档不清晰 / Unclear Documentation ### 3. 具体问题描述 / Problem Description <img width="2910" height="946" alt="Image" src="https://github.com/user-attachments/assets/a0962a84-eda6-4936-8cf7-83be1c76c537" /> 是否实际上是下面的步骤 a. SimpleAgent --"Calculate sqrt(16) + 2 * 3"--> LLM Interface b. LLM Interface --"TOOL_CALL"> SimpleAgent c. SimpleAgent --"execute tool"> Caculator Tool ### 4. 问题重现材料 / Reproduction Materials 无 ### 5. 补充信息 / Additional Information _No response_ ### 确认事项 / Verification - [x] 我已阅读过相关章节的文档 / I have read the relevant chapter documentation - [x] 我已搜索过现有的Issues,确认此问题未被报告 / I have searched existing Issues and confirmed this hasn't been reported - [x] 我已尝试过基本的故障排除(如重启、重新安装依赖等) / I have tried basic troubleshooting (restart, reinstall dependencies, etc.)