Describe the bug
I can see that interface Request has the _meta key, and that interface CallToolRequest extends Request. How ever, I can not see the _meta field in the schema.

In Python, the types reflect the typescript implementation, where CallToolRequestParams inherits RequestParams, and has the _meta key.

However, since the _meta field is missing in the schema, other languages, such as the rust implementation is missing this field.

Expected behavior
The schema should reflect the TS types.