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mcp: Enable legacy initialize fallback on any error (#1014)

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To guarantee a better compatibility with legacy server, enable the
fallback to the legacy initialize rpc in case of any error returned by
the server, in case of `server/discover` request.
This commit is contained in:
Guglielmo Colombo 2026-06-18 15:52:11 +02:00 • committed by GitHub
commit b85574f685
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1 changed files with 84 additions and 148 deletions
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internal/jsonrpc2/conn.go
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@ -735,7 +735,7 @@ func (c *Connection) write(ctx context.Context, msg Message) error {
// For cancelled or rejected requests, we don't set the writeErr (which would
// break the connection). They can just be returned to the caller.
if err != nil && ctx.Err() == nil && !errors.Is(err, ErrRejected) && !errors.Is(err, ErrUnsupportedProtocolVersion) && !errors.Is(err, ErrMethodNotFound) {
if err != nil && ctx.Err() == nil && !errors.Is(err, ErrRejected) {
// The call to Write failed, and since ctx.Err() is nil we can't attribute
// the failure (even indirectly) to Context cancellation. The writer appears
// to be broken, and future writes are likely to also fail.