Microsoft has released version 1.0 of the official C# SDK for the Model Context Protocol (MCP), achieving full support for the 2025-11-25 MCP Specification. Key additions include enhanced authorization server discovery with three ways to expose Protected Resource Metadata, icon metadata for tools/resources/prompts, Client ID Metadata Documents (CIMDs) as the preferred alternative to Dynamic Client Registration, tools in sampling requests for LLM invocation, improved long-running HTTP request handling via server-sent events with event IDs, and an experimental tasks feature for durable state tracking and deferred result retrieval.
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