[demetris]

That is not necessarily proof.

Sometimes I am too lazy to think of a good commit message, so I have a custom command that tells the assistant to do this:

Commit umstaged changes with a nice clean message summary and no full message.

By default, Claude Code co-signs those commits (which I do not like at all as a default).

[4nonverbal-alit]

The proof is good enough though.

Even if the code was written by author, not bothering to remove co-signed-by part from the commit message (assuming author did indeed wrote it by himself) let alone not writing their own commit message is an indication of negligence to me

[Griffinsauce]

Proof no, but you can safely apply occams razor here.