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Token/metadata caches in auth providers are not thread-safe

Status: Open.

#1595 In modelcontextprotocol/csharp-sdk;

· halter73 opened on May 21, 2026

McpClientOptions has no way to inject _meta into the initialize request

bugSomething isn't workingSomething isn't working

Status: Open.

#1593 In modelcontextprotocol/csharp-sdk;

· mirusser opened on May 21, 2026

RunSessionHandler (MCPEXP002): omitting`server.RunAsync(ct) silently hangs all MCP requests indefinitely with no diagnostic

bugSomething isn't workingSomething isn't working

Status: Open.

#1592 In modelcontextprotocol/csharp-sdk;

· mirusser opened on May 21, 2026

SEP-2260: Require Server requests to be associated with a Client request

Status: Open.

#1589 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 19, 2026

·  

2026-06-30 Spec Compliance

SEP-2577: Deprecate Roots, Sampling, and Logging

Status: Open.

#1588 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 19, 2026

·  

2026-06-30 Spec Compliance

OAuth token refresh fails with AADSTS9010010

bugSomething isn't workingSomething isn't working

Status: Open.

#1587 In modelcontextprotocol/csharp-sdk;

· sanjaydebnath opened on May 19, 2026

Streamable HTTP server accepts mismatched header/body protocol versions on initialize

bugSomething isn't workingSomething isn't working

Status: Open.

#1580 In modelcontextprotocol/csharp-sdk;

· cclabadmin opened on May 16, 2026

Stdio dispatch hangs after exactly 2 sequential tools/call requests (PowerShell client, sequential not concurrent)

Status: Open.

#1578 In modelcontextprotocol/csharp-sdk;

· mvonw opened on May 14, 2026

Allow sending Mcp-Param-* headers without calling ListToolsAsync first

Status: Open.

#1577 In modelcontextprotocol/csharp-sdk;

· tarekgh opened on May 14, 2026

Tool.InputSchema silently defaults to {"type":"object"} when absent from JSON, masking missing required field

Status: Open.

#1575 In modelcontextprotocol/csharp-sdk;

· jwoo-msft opened on May 14, 2026

Invalid Content-Encoding: identity header in SSE responses (RFC 9110 violation)

bugSomething isn't workingSomething isn't working

Status: Open.

#1574 In modelcontextprotocol/csharp-sdk;

· chrisdoopboop opened on May 14, 2026

SEP-2663: Tasks Extension

Status: Open.

#1573 In modelcontextprotocol/csharp-sdk;

· mikekistler opened on May 12, 2026

·  

2026-06-30 Spec Compliance