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SEP-1865: MCP Apps - Interactive User Interfaces for MCP

enhancementNew feature or requestNew feature or request

P2Moderate issues, valuable feature requestsModerate issues, valuable feature requests

ready for workHas enough information to startHas enough information to start

Status: Open.

#1431 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Mar 13, 2026

SEP-837: Update authorization spec to clarify client type requirements

Status: Open.

#1545 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

SEP-2350: Clarify client-side scope accumulation in step-up authorization

Status: Open.

#1547 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

SEP-2567: Sessionless MCP via Explicit State Handles

Status: Open.

#1548 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

SEP-2575: Make MCP Stateless

Status: Open.

#1549 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

SEP-2106: Tools inputSchema/outputSchema conform to JSON Schema 2020-12

Status: Open.

#1550 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

SEP-2468: Recommend Issuer (iss) Parameter in MCP Auth Responses

Status: Open.

#1571 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 12, 2026

SEP-2549: TTL for List Results

Status: Open.

#1572 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 12, 2026

SEP-2577: Deprecate Roots, Sampling, and Logging

Status: Open.

#1588 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 19, 2026

Add SEP-2549 caching hints (ttlMs and cacheScope) to cacheable results

Status: Open (in progress).

modelcontextprotocol/csharp-sdknumber 1623

#1623 In modelcontextprotocol/csharp-sdk;

· tarekgh opened on Jun 3, 2026

Implement RFC 9207 issuer validation in ClientOAuthProvider

Status: Open (in progress).

modelcontextprotocol/csharp-sdknumber 1605

#1605 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 27, 2026

Relax outputSchema to any JSON Schema 2020-12 document per SEP-2106

Status: Open (in progress).

modelcontextprotocol/csharp-sdknumber 1568

#1568 In modelcontextprotocol/csharp-sdk;

· jayaraman-venkatesan opened on May 9, 2026

Add draft protocol support: sessionless + handshake-less (SEP-2575 + SEP-2567)

Status: Draft (not ready).

modelcontextprotocol/csharp-sdknumber 1610

#1610 In modelcontextprotocol/csharp-sdk;

· halter73 opened on May 28, 2026

Add MCP Apps extension support (typed metadata, attribute, and helpers)

Status: Open (in progress).

modelcontextprotocol/csharp-sdknumber 1484

#1484 In modelcontextprotocol/csharp-sdk;

· Copilot opened on Mar 31, 2026