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

Release v0.29.0

What's Changed

• refactor: make CallToolRequest.Arguments more flexible (Breaking Change) by @​ezynda3 in mark3labs/mcp-go#287
• Drop unused fields from server.sseSession by @​ggoodman in mark3labs/mcp-go#303
• chore: remove unused variables and type arguments by @​pottekkat in mark3labs/mcp-go#302
• chore(Srv/stdio): duplicated setting of ErrorLogger by @​cryo-zd in mark3labs/mcp-go#306
• fix: handle the situation where the channel is closed by @​button-chen in mark3labs/mcp-go#304

Breaking Changes

In v0.29.0, MCP-Go introduces breaking changes to tool request handling. The main change is that request.Params.Arguments is no longer directly accessible as a map. Instead, you must use the new GetArguments() method to retrieve arguments as a map. For type-safe argument access, new helper methods like RequireString(), RequireFloat(), and RequireBool() have been added. To migrate:

1. Replace direct access to request.Params.Arguments["key"] with request.GetArguments()["key"]
2. For better type safety, use the new helper methods: request.RequireString("key"), request.RequireFloat("key"), etc.
3. For complex argument structures, use the new BindArguments() method with a struct, or try the new typed tool handlers with mcp.NewTypedToolHandler() as shown in the new examples/typed_tools example.

New Contributors

• @​ggoodman made their first contribution in mark3labs/mcp-go#303
• @​button-chen made their first contribution in mark3labs/mcp-go#304

Full Changelog: https://github.com/mark3labs/mcp-go/compare/v0.28.0...v0.29.0

• 99720bb fix: handle the situation where the channel is closed (#304)
• 420d521 chore(Srv/stdio): duplicated setting of ErrorLogger (#306)
• eaa6f29 chore: remove unused variables and type arguments (#302)
• 65010c4 chore: drop unused fields from sseSession (#303)
• 28c9cc3 refactor: make CallToolRequest.Arguments more flexible (Breaking Change) (#287)
• See full diff in compare view

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