插件中添加工具试运行报错execute tool failed : response is not object, raw response="***"

**Describe the bug**

**To Reproduce**

1.新建插件
2.创建工具

3.试运行输入参数后报错

**Expected behavior**

A clear and concise description of what you expected to happen.

**Screenshots**

If applicable, add screenshots to help explain your problem.

**Version:**

Please provide the version of {0.5.0} you are using.

**Environment:**

The output of `go env`.

**Additional context**

Add any other context about the problem here.

Start by reproducing the error through the plugin tool trial-run flow described in the issue, after creating a plugin and tool and submitting parameters. Trace the tool execution response handling and compare the raw response with the expected object shape; done means the trial run no longer reports that the response is not an object.

Written by the indexing model from the issue text.