自动调用工具读取文件内容始终为空

<img width="800" height="344" alt="Image" src="https://github.com/user-attachments/assets/66a88c33-c0c5-431b-afb9-fc47c82c45f1" />

<img width="787" height="262" alt="Image" src="https://github.com/user-attachments/assets/5e2d0195-5dbd-44b1-bf35-8cd9325a2918" />

如图所示，一直显示为空然后AI反馈读不到文件