What probably matters to youSection of the release
What
CLAUDE_CODE_AUTO_MODE_TIER is a new environment variable, a setting passed to Claude Code when it starts. It relates to auto mode, where Claude Code acts with less asking.
If it is not set, the default applies.
If it is set to anything at all, even "full", the tier becomes "strict".
A nearby prompt line reads Everything else → tier "full": no restrictions.
When set, it is added to the list of variables Claude Code writes in front of commands, next to CLAUDE_SECURESTORAGE_CONFIG_DIR, so it appears to be handed on to processes Claude Code starts.
What the strict tier restricts was not traced.
Why
This is an opt-in way to force a stricter auto mode. Because any value turns it on, setting it to "full" or "0" does not turn it off; remove the variable instead.