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Option to support declarative tool registration activated by version (e.g. "beta")

enhancementNew feature or requestNew feature or request

Status: Open.

#1557 In modelcontextprotocol/csharp-sdk;

· CharlieDigital opened on May 2, 2026

Method not found: 'System.String Microsoft.Extensions.AI.HostedMcpServerTool.get_AuthorizationToken()

bugSomething isn't workingSomething isn't working

Status: Open.

#1556 In modelcontextprotocol/csharp-sdk;

· egenita opened on May 2, 2026

SEP-2200: Clarify tool result content visibility

Status: Open.

#1552 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

SEP-2145: Standardize tools/call failure reporting

Status: Open.

#1551 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

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

Status: Open.

#1550 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

SEP-2575: Make MCP Stateless

Status: Open.

#1549 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

SEP-2567: Sessionless MCP via Explicit State Handles

Status: Open.

#1548 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

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

Status: Open.

#1547 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

SEP-2322: Multi Round-Trip Requests

Status: Open.

#1546 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

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

Status: Open.

#1545 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

SEP-2243: HTTP Standardization

Status: Open.

#1541 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance

SEP-2164: Standardize resource not found error code (-32602)

Status: Open.

#1540 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on Apr 30, 2026

·  

2026-06-30 Spec Compliance