https://csharp.sdk.modelcontextprotocol.io https://github.com/modelcontextprotocol/csharp-sdk git 2.0.0 preview.2 ModelContextProtocol © Model Context Protocol a Series of LF Projects, LLC. ModelContextProtocol;mcp;ai;llm Apache-2.0 logo.png true snupkg true $(RepoRoot)\Open.snk true true 1.3.0