"Enhanced authorization server discovery allows servers to expose Protected Resource Metadata through three different methods, offering more flexibility compared to the single method previously required. The SDK handles the full discovery process on the client side automatically."
"Incremental scope consent applies the principle of least privilege to MCP authorization by allowing clients to request only the minimum access needed for each operation. Previously, clients often had to request all possible permissions upfront. With the new mechanism, clients start with minimal scopes and request additional ones as required."
"URL mode elicitation enables servers to redirect sensitive interactions, such as API key collection or third-party authorization, away from the MCP client entirely and to a secure server-hosted URL. This approach prevents sensitive data from being transmitted through the client."
Microsoft's Model Context Protocol C# SDK version 1.0 delivers comprehensive support for the MCP Specification with multiple developer-focused enhancements. Enhanced authorization server discovery allows servers to expose Protected Resource Metadata through three flexible methods with automatic client-side discovery. Icon support extends to tools, resources, and prompts with configurable attributes including MIME types and theme preferences. Incremental scope consent implements least privilege principles by allowing clients to request minimal access initially and add permissions as needed. URL mode elicitation redirects sensitive interactions like API key collection to secure server-hosted URLs, preventing data transmission through the client. Tool calling support in sampling enables language models to interact with tools during requests.
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