Encountering MCP error -32602 when using local hosted MCP server

[dsilva-vd]

I'm running a local hosted Monday.com MCP server with dynamic APIs enabled. Windows 10 machine and Chrome based browser.

My Gen AI is trying to build a GraphQL query to pull 5 items from a board id using the person id. The person ID and board ID are verified and correct however I've created dummy values in the XML example

XML<function_calls> <invoke name="monday-api-mcp.all_monday_api" call_id="1"> <parameter name="query">query GetBoardItemsByPersonId($boardId: ID!) { boards(ids: [$boardId]) { items_page(query_params: { rules: [ { column_id: "person", compare_value: ["person-12345678"], operator: any_of } ] }) { items { id name } } } }</parameter> <parameter name="variables">{"boardId": 098877665544}</parameter> </invoke> </function_calls>

I get the generic MCP error and I've been struggling on how to instruct the Gen AI to format the request.

MCP error -32602: MCP error -32602: MCP error -32602: Invalid arguments for tool all_monday_api: [ { "code": "invalid_type", "expected": "string", "received": "object", "path": [ "variables" ], "message": "Expected string, received object" } ]

I'm looking for help in how to instruct the GEN AI to form the GraphQL. I would like to understand how to format the XML so that the variables string is correctly processed by the XML parser and then passed onto the all_monday_api.

Thanks!