You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.321,
ImprovementsSection of the release
What
MCP (Model Context Protocol) is the way Claude Code connects to outside tools and data sources, called MCP servers. When an MCP server returns a file, Claude Code now strips control characters, formatting characters and invisible characters from its name and title. There is also a cap on how many are handled.
Why
An MCP server you do not fully trust could hide text in characters you cannot see. Removing them makes it harder to slip hidden instructions to Claude through a file name.
