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mcp: Implement retry on advised supportedVersions in UnsupportedProtocolVersion error (#989)

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## Description

This PR introduces a retry mechanism for the discover method according
to SEP-2575 (Issue #966)
This commit is contained in:
Guglielmo Colombo 2026-06-08 15:09:07 +02:00 • committed by GitHub
commit d9714c61f1
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1 changed files with 172 additions and 34 deletions
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11
mcp/protocol.go
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@ -2103,3 +2103,14 @@ const (
// MetaKeyClientCapabilities carries the client's [ClientCapabilities].
MetaKeyClientCapabilities = "io.modelcontextprotocol/clientCapabilities"
)
// UnsupportedProtocolVersionData is the SEP-2575 payload carried in the
// `data` field of a JSON-RPC error response with code
// [CodeUnsupportedProtocolVersion]. The server uses it to advertise which
// versions it supports so the client can pick a mutually supported one.
type UnsupportedProtocolVersionData struct {
// Supported is the list of protocol versions the server supports.
Supported []string `json:"supported"`
// Requested is the protocol version the client asked for.
Requested string `json:"requested"`
}