The output of a coding assistant cannot be copyrighted, but it may contain code from which the copyright has been removed and which is used in a manner incompatible with the original license.
Even the more permissive licenses, like BSD, MIT, etc., forbid the removal of the copyright notice when the code is reused.
While this may also happen with the source programs used for training, I was not aware about the behavior described in TFA for the Anthropic agents, which may search the Internet for source code applicable to the problem that must be solved. It seems even more likely that such code will not be used as allowed by its license.
