What’s new in the MCP C# SDK v1.0, including enhanced authorization, richer metadata, tool calling enhancements and long-running requests.

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The Model Context Protocol (MCP) C# SDK has reached v1.0, implementing the 2025-11-25 MCP Specification. Key additions include: enhanced OAuth authorization server discovery with three PRM exposure methods; icon metadata for tools, resources, and prompts; incremental scope consent following the principle of least privilege; URL mode elicitation for secure out-of-band user interactions; tool calling support within LLM sampling requests using Microsoft.Extensions.AI; OAuth Client ID Metadata Documents (CIMD) as a preferred alternative to Dynamic Client Registration; long-running HTTP request handling via SSE polling with DistributedCacheEventStreamStore; and experimental Tasks support for durable state tracking and deferred result retrieval with lifecycle management.

Release v1.0 of the official MCP C# SDK

Enhanced authorization server discovery Copy link

Icons for tools, resources, and prompts Copy link

Tool calling support in sampling Copy link

OAuth Client ID Metadata Documents Copy link

Long-running requests over HTTP with polling Copy link