Claude Code can fork an agent: start a separate helper that begins with a copy of the current conversation. When the forked agent finishes, its returned messages used to include everything it began with. By default it now leaves out the messages it inherited and returns only its own.
A new keepPreservedMessages option brings back the inherited messages. A second option deals with cutting tool results.
Whatever receives a forked agent's results now gets just what the fork added, unless it asks for the inherited messages too.
tengu_wild_tome Off by default, switched on for this accountThe shipped code defaults this off, and the flag server returned on for the one account this site reads on this version. That is the reading that makes the entry above worth a second look, and it still says nothing about your account.
This account: on · anonymous baseline: on · compiled default in v2.1.323: off
These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.
Read once, for one account on one subscription tier, against v2.1.323. It isn't a statement about your account. What a flag value here can and cannot tell you