Under the hood
Claude Code now skips redundant tool/resource discovery for MCP servers it already has a listing for
What
When connecting to MCP servers (external tool providers via the Model Context Protocol), Claude Code now passes along a set of 'known listings' it already has. A server that's already in this known set is now also treated as eligible to always be loaded.
Why
This avoids repeating discovery work for MCP servers whose tools, commands, and resources are already known, which should make connecting to already-known servers faster.