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With the MCP C# SDK, which now helps protocol specification model 2025-06-18, builders get a brand new authentication protocol that enhances safety and adaptability for AI purposes, in keeping with Microsoft. The brand new protocol separates roles of the authentication and useful resource servers, enabling simpler integration with present OAuth 2.0 and OpenID join suppliers.
Builders utilizing the up to date SDK additionally acquire entry to MCP’s new elicitation characteristic, which permits servers to request extra info throughout interplay. Elicitation permits extra dynamic and interactive AI experiences, making it simpler to assemble crucial context earlier than executing duties, Microsoft stated. Elicitation is an non-obligatory characteristic. Purchasers can declare help for it as a part of their initialize request. Within the MCP C# SDK, that is completed by configuring an ElicitationHandler within the McpClientOptions.
Lastly, the 2025-06-18 spec additionally helps structured device output. Previous to this help, device outcomes had been allowed to comprise structured information however the LLM needed to carry out parsing and interpretation with none steerage from the device itself. Now, instruments can return structured content material that’s explicitly outlined. This enables AI fashions to higher perceive and course of the output, in keeping with Microsoft. The MCP C# SDK permits instruments to specify that their output is structured by way of the UseStructuredContent parameter of the McpServerTool attribute.
