Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Cloud SessionsArea: what it touches
Internal ChangesKind: in v2.1.296,
Internal ChangesSection of the release
Unclear It is not clear whether builtinTools is an option you can set yourself, or where it is set.
What
Claude Code now passes a builtinTools option on to the session it starts, together with the lists of allowed and disallowed tools. Built-in tools are the actions that come with Claude Code, such as reading files or running commands.
Why
This may be a way to choose which built-in tools a session gets.