What
MCP (Model Context Protocol) servers are external programs that give Claude Code extra tools and data. Resources are items such a server offers for reading. When Claude Code lists a server's resources for Claude, it now leaves out MCP Apps UI resources and writes a debug line saying how many were left out.
A resource counts as MCP Apps UI when either:
- Its address starts with
ui://. - It is
text/htmlwithprofile=mcp-app.
These resources can still be read directly by their address. The filter applies to everyone.
Why
Claude's resource list no longer includes interface pages meant for display, only the resources it might want to read.