Returning JSON in the MCP client

[Impuls2003]

Hi!
I’m working with mcp-go and have a question about tool results formatting.
On the server side I return a JSON string as text:

res := `{"status": "ok", "data": 123}`
return mcp.NewToolResultText(res), nil

But in LM Studio the LLM receives it as:

{
  "type": "text",
  "text": "{ \"status\": \"ok\", \"data\": \"125\" }"
}

So the JSON is always wrapped as a text content block, even when the payload is valid JSON.
Using mcp.NewToolResultJSON(...) produces the same visible result in LM Studio.

My question:
Is there a recommended way to return structured JSON data so the client/LLM can reliably treat it as an object rather than plain text?

Thanks!