Under the hood
Internal rework of how Claude Code builds MCP tool listings, with no user-facing behavior change described
What
The internal code that builds the list of tools exposed by MCP (Model Context Protocol, a standard for connecting external tools to Claude) servers was restructured. Shared metadata for a server, such as its name, scope, prompt overrides, and telemetry info, is now built once per server, and each individual tool merges in its own overrides (such as Claude-in-Chrome or SDK server overrides) through a shared builder function, instead of each tool being assembled inline from scratch.
Why
This is a code organization change to how MCP tool metadata is assembled internally; it does not describe a change in what tools do or how they behave.