---

This section details on the original issue you should resolve

<issue_title>Add support for data to McpProtocolException</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.

The McpProtocolException class doesn't support data. I'm trying to add the uri to the Resource not found error, as shown here.

Describe the solution you'd like

Add another exception parameter, or pass along Exception.Data.

Describe alternatives you've considered

I tried using Exception.Data, but it's not persisted.

throw new McpProtocolException(
    ReadResourceHandler_ResourceNotFound,
    (McpErrorCode)(-32002))
{
    Data =
    {
        { "uri", context.Params!.Uri }
    }
};

Additional context

See also #863.</issue_description>

<agent_instructions>Where JSON RPC errors are created from McpProtocolExceptions, please update the logic to use Exception.Data as the "data" object of the "error" object.</agent_instructions>

Comments on the Issue (you are @copilot in this section)