unsupported operand type(s) for +: 'dict' and 'str'", annotations=None)], isError=True)

[mhyy10]

Describe the bug
tool_name = tool_call['function']['name']
tool_args = json.loads(tool_call['function']['arguments'])
result = await self.session.call_tool(tool_name, tool_args)
CallToolResult(meta=None, content=[TextContent(type='text', text="Error executing tool task_overview: unsupported operand type(s) for +: 'dict' and 'str'", annotations=None)], isError=True)

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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