Unclear The finding does not confirm that the rebuilt argument is passed to child processes, only that this appears to be its purpose.
What
--setting-sources is a command-line option that chooses which settings files Claude Code loads. New helper code takes the setting sources in use and writes them back out as a --setting-sources= argument. If a source is not valid, the error now lists the valid options, starting "Invalid setting source:".
Why
The setting sources you chose can be passed along to other Claude Code processes, and a mistyped source now tells you what is accepted.
Names in the bundle--setting-sources
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up --setting-sources, on Plugin loading reference.
* A session you start with a [`--setting-sources`](/docs/en/cli-reference#cli-flags) list that leaves out `user`plugins/loading see the edit
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not confirm that the rebuilt argument is passed to child processes, only that this appears to be its purpose.
Anthropic's documentation agrees
Anthropic's documentation has since written up --setting-sources, on Plugin loading reference.
Anthropic's release notes agree
Fixed --setting-sources (and SDK settingSources) not being forwarded to spawned sessions: teammates, /bg, claude agents sessions and…