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Returning an EmbeddedResourceBlock from a tool do not work with Claude Desktop

needs-author-action

Status: Open.

#1261 In modelcontextprotocol/csharp-sdk;

· eng-marani opened on Feb 11, 2026

Intermediate strings created in MCP transport

Status: Open.

#1259 In modelcontextprotocol/csharp-sdk;

· ericstj opened on Feb 10, 2026

Experimental APIs force users to suppress diagnostics even when they are not used

Status: Open.

#1255 In modelcontextprotocol/csharp-sdk;

· MackinnonBuck opened on Feb 7, 2026

·  

Stable public API

tools list does not contain descriptions for nested properties in the input schema

enhancementNew feature or requestNew feature or request

needs-author-action

Status: Open.

#1240 In modelcontextprotocol/csharp-sdk;

· Jarryd-Lansdell opened on Feb 3, 2026

notifications/tools/list_changed handler apparently times out over Streamable HTTP

bugSomething isn't workingSomething isn't working

Status: Open.

#1239 In modelcontextprotocol/csharp-sdk;

· janwilch opened on Feb 3, 2026

Specified ClientOAuthOptions.Scopes are ignored

bugSomething isn't workingSomething isn't working

Status: Open.

#1236 In modelcontextprotocol/csharp-sdk;

· halllo opened on Feb 2, 2026

Version-Based Tool Registration for MCP Server

enhancementNew feature or requestNew feature or request

Status: Open.

#1216 In modelcontextprotocol/csharp-sdk;

· Christian-Steusloff opened on Jan 30, 2026

Host multiple MCP servers with different HTTP endpoints in one process using keyed services

enhancementNew feature or requestNew feature or request

Status: Open.

#1202 In modelcontextprotocol/csharp-sdk;

· flensrocker opened on Jan 29, 2026

Remove use of AsyncLocal to track Task input_required status

Status: Open.

#1185 In modelcontextprotocol/csharp-sdk;

· halter73 opened on Jan 28, 2026

Support elicitation and sampling requests in tasks/result response

Status: Open.

#1184 In modelcontextprotocol/csharp-sdk;

· halter73 opened on Jan 28, 2026

Split ElicitationMcpTasksCapability into server and client versions

Status: Open.

#1183 In modelcontextprotocol/csharp-sdk;

· halter73 opened on Jan 28, 2026

Proof of Concept: MCP Apps

Status: Open.

Task

#1182 In modelcontextprotocol/csharp-sdk;

· jeffhandley opened on Jan 28, 2026

·  

Stable public API