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mcp: cap negotiated protocolVersion in legacy initialize to protocolVersion20251125 (#1051)

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Fixes #1033
This commit is contained in:
Guglielmo Colombo 2026-07-06 17:40:27 +02:00 • committed by GitHub
commit ec564f9ccb
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1 changed files with 3 additions and 5 deletions
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8
mcp/shared.go
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@ -57,15 +57,13 @@ func negotiatedVersion(clientVersion string) string {
// In general, prefer to use the clientVersion, but if we don't support the
// client's version, use the latest version.
//
// This handles the case where a new spec version is released, and the SDK
// does not support it yet.
// Cap the supported versions at the legacy protocolVersion20251125, as this
// method is used by the initialize method which is deprecated in
// version protocolVersion20260728.
if !slices.Contains(supportedProtocolVersions, clientVersion) {
return protocolVersion20251125
if slices.Contains(supportedProtocolVersions, clientVersion) && clientVersion < protocolVersion20260728 {
return clientVersion
}
return clientVersion
return protocolVersion20251125
}
// negotiateMutuallySupportedVersion returns a protocol version that is supported