What
When Claude Code packages up the options for a session to hand them on, it now includes two more when set:
max_turns, the limit on how many turns Claude may takebuiltin_tools, the list of built-in tools allowed
Before, only the custom system prompt, spending limit, and allowed and disallowed tool lists were passed along.
Why
A turn limit or a built-in tool list you set can now reach the other side, instead of being dropped.
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Which part of Claude Code receives and uses these options is not stated.