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OpenAug 5, 2026
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•Last updated 13% complete
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Streamable HTTP: no opt-out for standalone SSE GET — handshake deadlocks under connection-pool pressure
bugSomething isn't workingSomething isn't workingP1Significant bug affecting many usersSignificant bug affecting many usersStatus: Closed (completed).#1637 In modelcontextprotocol/csharp-sdk;SDK Implementation of Authorization is not compatible with the specification. code_challenge_methods_supported is handled incorrectly
bugSomething isn't workingSomething isn't workingneeds confirmationUnclear if still relevantUnclear if still relevantStatus: Closed (completed).#730 In modelcontextprotocol/csharp-sdk;ClientOAuthProvider throws "Client ID is not available" on cold start when a refresh token is persisted but client ID is not
bugSomething isn't workingSomething isn't workingP2Moderate issues, valuable feature requestsModerate issues, valuable feature requestsStatus: Closed (completed).#1658 In modelcontextprotocol/csharp-sdk;- Status: Merged (completed).modelcontextprotocol/csharp-sdknumber 1596#1596 In modelcontextprotocol/csharp-sdk;
Token/metadata caches in auth providers are not thread-safe
bugSomething isn't workingSomething isn't workingP2Moderate issues, valuable feature requestsModerate issues, valuable feature requestsStatus: Closed (completed).#1595 In modelcontextprotocol/csharp-sdk;Add a public subscriptions/listen server handler for custom streaming
enhancementNew feature or requestNew feature or requestP2Moderate issues, valuable feature requestsModerate issues, valuable feature requestsready for workHas enough information to startHas enough information to startStatus: Closed (completed).#1662 In modelcontextprotocol/csharp-sdk;AutoDetecttransport hides the real error: surfaces 405 to the user when the server actually returned 415bugSomething isn't workingSomething isn't workingP2Moderate issues, valuable feature requestsModerate issues, valuable feature requestsStatus: Closed (completed).#1526 In modelcontextprotocol/csharp-sdk;Stdio requests with deeply nested params can remain pending while the server remains healthy
bugSomething isn't workingSomething isn't workingP2Moderate issues, valuable feature requestsModerate issues, valuable feature requestsStatus: Closed (completed).#1614 In modelcontextprotocol/csharp-sdk;Returning an EmbeddedResourceBlock from a tool do not work with Claude Desktop
documentationImprovements or additions to documentationImprovements or additions to documentationenhancementNew feature or requestNew feature or requesthelp wantedContributions welcome from those familiar with codebaseContributions welcome from those familiar with codebaseP3Nice to haves, rare edge casesNice to haves, rare edge casesready for workHas enough information to startHas enough information to startStatus: Closed (completed).#1261 In modelcontextprotocol/csharp-sdk;Configurationproperty shouldn't be read in Directory.Build.propsbugSomething isn't workingSomething isn't workinghelp wantedContributions welcome from those familiar with codebaseContributions welcome from those familiar with codebaseP3Nice to haves, rare edge casesNice to haves, rare edge casesready for workHas enough information to startHas enough information to startStatus: Closed (completed).#995 In modelcontextprotocol/csharp-sdk;Provide an example of how to connect telemetry with Application Insights
documentationImprovements or additions to documentationImprovements or additions to documentationenhancementNew feature or requestNew feature or requesthelp wantedContributions welcome from those familiar with codebaseContributions welcome from those familiar with codebaseP3Nice to haves, rare edge casesNice to haves, rare edge casesready for workHas enough information to startHas enough information to startStatus: Closed (completed).#1026 In modelcontextprotocol/csharp-sdk;Sse Auto Reconnect
enhancementNew feature or requestNew feature or requestneeds confirmationUnclear if still relevantUnclear if still relevantStatus: Not planned (skipped).#726 In modelcontextprotocol/csharp-sdk;Support PRM subpaths per RFC 9728 (multiple resources per host)
enhancementNew feature or requestNew feature or requestneeds confirmationUnclear if still relevantUnclear if still relevantStatus: Closed (completed).#812 In modelcontextprotocol/csharp-sdk;Add support for statically-defined parametric prompts
enhancementNew feature or requestNew feature or requestneeds confirmationUnclear if still relevantUnclear if still relevantStatus: Not planned (skipped).#836 In modelcontextprotocol/csharp-sdk;Add support for currently failing non-task
@modelcontextprotocol/conformancetestsarea-testsIssue related to testsIssue related to testsP2Moderate issues, valuable feature requestsModerate issues, valuable feature requestsready for workHas enough information to startHas enough information to startStatus: Closed (completed).#1731 In modelcontextprotocol/csharp-sdk;Client fails to connect when a server rejects the server/discover probe with HTTP 404
bugSomething isn't workingSomething isn't workingP1Significant bug affecting many usersSignificant bug affecting many usersready for workHas enough information to startHas enough information to startStatus: Closed (completed).#1765 In modelcontextprotocol/csharp-sdk;