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

Status: Open.

#1571 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

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

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

Status: Open (in progress).

modelcontextprotocol/csharp-sdknumber 1610

#1610 In modelcontextprotocol/csharp-sdk;

· halter73 opened on May 28, 2026

2026-07-28 Spec Compliance

Status: Open.

#1539 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

Implementation for SEP-2350 Client-side scope accumulation in step-up authorization

Status: Open (in progress).

modelcontextprotocol/csharp-sdknumber 1591

#1591 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 20, 2026