Release v2.1.0

[jeffhandley]

Release v2.1.0

This release adds an opt-in subscriptions/listen handler for custom server-side notification streams, improves HTTP transport fallback reliability, and expands guidance and samples for telemetry and binary resources.

Release Notes

What's Changed

• Keep AutoDetect channel open after provisional SSE failure Keep AutoDetect channel open after provisional SSE failure #1768 by @PranavSenthilnathan
• Preserve HTTP status codes across target frameworks Preserve HTTP status codes across target frameworks #1767 by @PranavSenthilnathan
• Fall back to initialize when server/discover fails at the HTTP layer Fall back to initialize when server/discover fails at the HTTP layer #1766 by @rbstp
• Add public subscriptions/listen server handler (SEP-2575) Add public subscriptions/listen server handler (SEP-2575) #1775 by @tarekgh

Documentation Updates

• Add README for the InMemoryTransport sample Add README for the InMemoryTransport sample #1769 by @AkbarDizaji
• Add Application Insights telemetry example Add Application Insights telemetry example #1778 by @lntutor
• Clarify client handling of embedded binary tool resources Clarify client handling of embedded binary tool resources #1762 by @luisangelrod

Test Improvements

• Speed up CLI argument escaping tests Speed up CLI argument escaping tests #1773 by @PranavSenthilnathan

Repository Infrastructure Updates

• Clarify AI disclosure format with a > [!NOTE] alert example Clarify AI disclosure format with > [!NOTE] alert example #1771 by @PranavSenthilnathan (co-authored by @copilot)
• Bump the npm_and_yarn group across 1 directory with 6 updates Bump the npm_and_yarn group across 1 directory with 6 updates #1787
• Avoid reading Configuration in Directory.Build.props Avoid reading Configuration in Directory.Build.props #1776 by @lntutor
• Bump danielpalme/ReportGenerator-GitHub-Action from 5.5.10 to 5.5.11 Bump danielpalme/ReportGenerator-GitHub-Action from 5.5.10 to 5.5.11 #1784

Acknowledgements

• @AkbarDizaji made their first contribution in Add README for the InMemoryTransport sample #1769
• @luisangelrod made their first contribution in Clarify client handling of embedded binary tool resources #1762
• @rbstp submitted issue Client fails to connect when a server rejects the server/discover probe with HTTP 404 #1765 (resolved by Fall back to initialize when server/discover fails at the HTTP layer #1766)
• @TomasHubelbauer submitted issue Provide an example of how to connect telemetry with Application Insights #1026 (resolved by Add Application Insights telemetry example #1778)
• @Youssef1313 submitted issue Configuration property shouldn't be read in Directory.Build.props #995 (resolved by Fall back to initialize when server/discover fails at the HTTP layer #1766)
• @eng-marani submitted issue Returning an EmbeddedResourceBlock from a tool do not work with Claude Desktop #1261 (resolved by Clarify client handling of embedded binary tool resources #1762)
• @jeffhandley @tarekgh @halter73 @PranavSenthilnathan reviewed pull requests

Full Changelog: v2.0.0...v2.1.0

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API Compatibility Report

Individual package validation against v2.0.0 passed for ModelContextProtocol.Core, ModelContextProtocol, ModelContextProtocol.AspNetCore, ModelContextProtocol.Extensions.Apps, and ModelContextProtocol.Extensions.Tasks. Core uses 312 existing task-migration suppressions; no suppressions were added.

API Diff Report

ModelContextProtocol.Core

+ McpServerHandlers.SubscriptionsListenHandler

ModelContextProtocol

+ IMcpServerBuilder.WithSubscriptionsListenHandler(...)

ModelContextProtocol.AspNetCore

No public API changes.

Note

This pull request description was generated by GitHub Copilot.