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Set list of supported versions #945
Description
Is your feature request related to a problem? Please describe.
Right now, the SDK hardcodes the supported spec versions https://github.com/modelcontextprotocol/go-sdk/blob/main/mcp/shared.go#L43. However, we do not want to support 2024-11-05 but there is no way to configure that in the SDK so that it returns "Unsupported protocol" -32602 error.
Describe the solution you'd like
I suggest mcp.ServerOptions has a "SupportedVersions" slice that accepts a list of version enums. The zero value can fall back to the current default list.
Describe alternatives you've considered
Right now the workaround i can think of is having to intercept the initialization request and returning the unsupported protocol error
Activity
maciej-kisiel commentedon May 11, 2026
Could you comment why you don't want to support that particular version?
zmay2030 commentedon May 11, 2026
@maciej-kisiel Because according to my understanding, 2024-11-05 would require exposing two additional routes (/sse & /msg) which will add more complexity
mcp: allow restricting the protocol versions a server supports (model…