Default to the latest stable protocol version#190
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koic merged 1 commit intomodelcontextprotocol:mainfrom Dec 20, 2025
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Default to the latest stable protocol version#190koic merged 1 commit intomodelcontextprotocol:mainfrom
koic merged 1 commit intomodelcontextprotocol:mainfrom
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When starting an MCP server in Claude Code with `protocol_version` set to `DRAFT-2025-v3`, it fails with the following error: ```console 2025-12-04T02:58:01.548Z [DEBUG] MCP server "example": Connection failed after 2093ms: Server's protocol version is not supported: DRAFT-2025-v3 2025-12-04T02:58:01.548Z [ERROR] MCP server "example" Connection failed: Server's protocol version is not supported: DRAFT-2025-v3 ``` This PR changes the default behavior so that if `protocol_version` is not specified, it uses the latest stable protocol version instead of the draft version. This PR also updates the README to note that the latest stable protocol version includes new features from the draft version.
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atesgoral
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Motivation and Context
When starting an MCP server in Claude Code with
protocol_versionset toDRAFT-2025-v3, it fails with the following error:This PR changes the default behavior so that if
protocol_versionis not specified, it uses the latest stable protocol version instead of the draft version.This PR also updates the README to note that the latest stable protocol version includes new features from the draft version.
How Has This Been Tested?
Existing tests have been updated to pass. I also verified its operation with Claude Code.
Breaking Changes
None.
Types of changes
Checklist