MCP Tool doesn't pass in parameters

When using this sample to connect to an MCP server, I am unable to have aws sonic pass in the correct parameters

MCP Tool
```
@mcp.tool()
def add(a: int, b: int) -> int:
"""Add two numbers"""
print(f"Tool 'add' called with parameters: a={a}, b={b}", file=sys.stderr)
result = a + b
print(f"Tool 'add' returning result: {result}", file=sys.stderr)
return result
```

Tool view from /api/mcp-servers:

```
{
"name": "add",
"description": "Add two numbers",
"inputSchema": {
"type": "object",
"properties": {
"a": {
"title": "A",
"type": "integer"
},
"b": {
"title": "B",
"type": "integer"
}
},
"required": [
"a",
"b"
],
"title": "addArguments"
},
"serverName": "DemoMCP"
},
```

Response after attempting to use tool

```
Calling MCP tool: DemoMCP/add with args {"completionId":"c6a6f24f-0723-4537-a689-678e5e6783e4","content":"{}","contentId":"cb12e6d8-9a83-44fd-8cd9-162f42cba722","promptName":"330a7ee4-1742-4df7-a48a-2f67579dafb5","role":"TOOL","sessionId":"6ba9d1a7-00ae-42c5-a8b1-8244cf29aeb5","toolName":"add","toolUseId":"e413b14b-2863-43ef-babd-78af79747e5f"}
Sending tool result for session FFhRVr9h4ObFYttXAAAD, tool use ID: e413b14b-2863-43ef-babd-78af79747e5f
********** [
{
type: 'text',
text: 'Error executing tool add: 2 validation errors for addArguments\n' +
'a\n' +
' Field required [type=missing, input_value={}, input_type=dict]\n' +
' For further information visit https://errors.pydantic.dev/2.11/v/missing\n' +
'b\n' +
' Field required [type=missing, input_value={}, input_type=dict]\n' +
' For further information visit https://errors.pydantic.dev/2.11/v/missing'
}
]
```

Any ideas on how to get the correct args passed in?