Xcode 26.3 MCP is a hit or miss so far. It's faster, but can't seem to switch run destinations. XcodeListNavigatorIssues seems to use the famously reliable "Issues" navigator window to determine if there were any errors. A bit odd.
@miguelcabeca yes, it's part of the Xcode 26.3 release. I use it with Claude Code via MCP, and it's clear from its output when it invokes ExecuteSnippet. It just did five trial-and-error checks to see how Image I/O APIs work in different scenarios.