What probably matters to youSection of the release
What
An MCP (Model Context Protocol, the standard Claude Code uses to connect external tools) server can now mark a tool as hidden from the model. It does this through a _meta.ui.visibility field on the tool: if that field's list of visibility targets leaves out "model", or can't be parsed at all, Claude Code treats the tool as hidden and drops it from the list of tools the model can call.
The hiding only applies to what the model sees. The tool still shows up for the person running Claude Code, in the mcp_status view.
Why
This lets an MCP server author ship a tool meant for humans (or some other consumer) without cluttering the model's own tool list or letting it be called unintentionally, while still keeping the tool visible to the person using Claude Code.
