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Request to add support for default `_meta` parameters in MCPServer, driven by the need to pass `io.modelcontextprotocol/server-variant` for new MCP features.
### Description This issue was inspired by https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2053. The new MCP feature will require passing `io.modelcontextprotocol/server-variant` _meta parameter in all requests to the MCP server. Looking at that discussion, I believe it is the new trend to implement new functionality using additional _meta properties. To support that, I want to add default _meta properties to MCPServer. ### References https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2053