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mcp: update return meta in DiscoverResult (SEP-2575) (#1097)

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This PR implements the latest changes introduced by
https://github.com/modelcontextprotocol/modelcontextprotocol/pull/3002
This commit is contained in:
Guglielmo Colombo 2026-07-16 16:10:12 +02:00 • committed by GitHub
commit 5cb8339210
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1 changed files with 210 additions and 68 deletions
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21
mcp/shared.go
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@ -535,9 +535,10 @@ type validatedMeta struct {
// the >= 2026-07-28 protocol via the `_meta` field.
// If the request has no _meta, or no protocolVersion in _meta, it returns a non-nil
// validatedMeta with usesNewProtocol set to false, and a nil error.
// If the request has a protocolVersion in _meta it validates the presence of clientInfo
// and clientCapabilities in _meta. If either is missing or invalid, it returns nil and
// a non-nil error. Otherwise, it returns usesNewProtocol set to true and the populated
// If the request has a protocolVersion in _meta it validates the presence of
// clientCapabilities in _meta. If it is missing or invalid, it returns nil and
// a non-nil error. clientInfo is optional; if present but invalid, an error is
// returned. Otherwise, it returns usesNewProtocol set to true and the populated
// initializeParams.
func validateRequestMeta(req *jsonrpc.Request) (*validatedMeta, error) {
meta := extractRequestMeta(req.Params)
@ -548,11 +549,15 @@ func validateRequestMeta(req *jsonrpc.Request) (*validatedMeta, error) {
if !ok || protocolVersion < protocolVersion20260728 {
return &validatedMeta{usesNewProtocol: false, initializeParams: nil}, nil
}
clientInfo, ok := decodeMetaValue[*Implementation](meta, MetaKeyClientInfo)
if !ok {
return nil, &jsonrpc.Error{
Code: jsonrpc.CodeInvalidParams,
Message: fmt.Sprintf("missing or invalid _meta field %q", MetaKeyClientInfo),
var clientInfo *Implementation
if _, present := meta[MetaKeyClientInfo]; present {
var ok bool
clientInfo, ok = decodeMetaValue[*Implementation](meta, MetaKeyClientInfo)
if !ok {
return nil, &jsonrpc.Error{
Code: jsonrpc.CodeInvalidParams,
Message: fmt.Sprintf("invalid _meta field %q", MetaKeyClientInfo),
}
}
}
capabilities, ok := decodeMetaValue[*clientCapabilitiesV2](meta, MetaKeyClientCapabilities)