Sourced from github.com/mark3labs/mcp-go's releases.

Release v0.44.1

No release notes provided.

Release v0.44.0

What's Changed

• feat: defer tool loading to enable Anthropic's "Tool Search" pattern by @​wolfeidau in mark3labs/mcp-go#644
• fix: return an error if the responseWriter does not support Flush by @​JoelPfaffDD in mark3labs/mcp-go#652
• Add Icons support for MCP spec 2025-11-25 compliance by @​dask-58 in mark3labs/mcp-go#660
• fix: add ErrUnauthorized sentinel for static token 401 responses by @​ezynda3 in mark3labs/mcp-go#661
• Add lastModified field to Annotations for MCP spec 2025-11-25 by @​dask-58 in mark3labs/mcp-go#663
• Add server-side support for MCP tasks by @​JAORMX in mark3labs/mcp-go#635
• fix: drain all pending notification before writing the response to avoid missing notifications by @​archit-harness in mark3labs/mcp-go#670
• fix for nil resources slice by @​furysama in mark3labs/mcp-go#665
• Add docstrings for annotation-related functions by @​ezynda3 in mark3labs/mcp-go#673
• fix: add timeout for SSE response waiting to prevent indefinite blocking by @​everfid-ever in mark3labs/mcp-go#668
• Try OAuth Authorization Server Metadata first by @​staugaard in mark3labs/mcp-go#669
• fix(oauth): check for OAuth error responses even when status code is 200 by @​sd2k in mark3labs/mcp-go#646
• fix: Add missing session cleanup to the StreamableHTTPServer DELETE handler by @​cnnrznn in mark3labs/mcp-go#667
• Implement Elicitation URL mode for MCP spec 2025-11-25 by @​dask-58 in mark3labs/mcp-go#666
• feat: Add Host header override support for manual DNS resolution by @​ComingCL in mark3labs/mcp-go#674
• fix: low mcp version been selected by mcp server, mcp server may also raise 'unsupported protocol version 2025-11-25' error by @​yuehaii in mark3labs/mcp-go#687
• Add AdditionalProperties to ToolInputSchema by @​mohit-gupta-glean in mark3labs/mcp-go#678
• fix: fix TestSSE_SendRequest_Timeout flaky test by @​everfid-ever in mark3labs/mcp-go#683
• feat:add version 2025-11-25 & unit test for version by @​CocaineCong in mark3labs/mcp-go#684
• fix: use sync.Once for thread-safe Close in StreamableHTTP by @​semihbkgr in mark3labs/mcp-go#685
• docs: fix ListTools usage to include ListToolsRequest parameter by @​everfid-ever in mark3labs/mcp-go#681
• fix: return 404 instead of 400 for invalid session IDs by @​burugo in mark3labs/mcp-go#689
• fix: rename NewToolResultAudio second parameter from imageData to aud… by @​mosesyu95 in mark3labs/mcp-go#691
• Server handlers implementation for auto-completion by @​ezraisw in mark3labs/mcp-go#679
• Fix: the header information set by the client being lost. by @​button-chen in mark3labs/mcp-go#686
• Set test client info by @​urisimchoni in mark3labs/mcp-go#692
• refactor: fix modernize lint issues by @​alexandear in mark3labs/mcp-go#699
• refactor: simplify tests with the usetesting linter by @​alexandear in mark3labs/mcp-go#703
• typo: fix duplicate description of mcp-go in README by @​milairhu in mark3labs/mcp-go#701
• feat(server): implement task-augmented tools capability by @​ezynda3 in mark3labs/mcp-go#707
• tool "properties" and "required" fields missing if set them as null, AdditionalProperties can't be masharl by @​yuehaii in mark3labs/mcp-go#713
• Fix no way to detect connection closure in non-NO_ERROR cases by @​manx98 in mark3labs/mcp-go#709
• fix: accept HTTP 204 No Content in SendNotification by @​satish-karri-glean in mark3labs/mcp-go#717
• fix: use custom session id generator when provided by @​FlameHost10 in mark3labs/mcp-go#715
• fix: SendRequest hangs forever when server process dies by @​ichoosetoaccept in mark3labs/mcp-go#714

New Contributors

• @​wolfeidau made their first contribution in mark3labs/mcp-go#644
• @​JoelPfaffDD made their first contribution in mark3labs/mcp-go#652
• @​dask-58 made their first contribution in mark3labs/mcp-go#660
• @​JAORMX made their first contribution in mark3labs/mcp-go#635
• @​archit-harness made their first contribution in mark3labs/mcp-go#670
• @​furysama made their first contribution in mark3labs/mcp-go#665
• @​everfid-ever made their first contribution in mark3labs/mcp-go#668
• @​staugaard made their first contribution in mark3labs/mcp-go#669

... (truncated)

• 6bea1d4 fix: add session idle TTL sweeper to prevent transport state leak (#724)
• 0510f0c fix: SendRequest hangs forever when server process dies (#714)
• 962f31b fix: use custom session id generator when provided (#715)
• 7ce32bf fix: accept HTTP 204 No Content in SendNotification (#717)
• 7c44752 fix(ci): pin Go version to 1.25 in lint workflow
• 859588d fix: call onConnectionLost when SSE connection closes, not only on NO_ERROR (...
• b2fb8ba tool "properties" and "required" fields missing if set them as null, Addition...
• e2c1762 feat(server): implement task-augmented tools capability (#707)
• 45740a0 typo: fix duplicate description of mcp-go in README (#701)
• d46cf85 refactor: simplify tests with the usetesting linter (#703)
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