git revert writes no Assisted-by trailer, and the attribution commit gate (now also on the merge queue and on push to main, iss-280) refuses the message, so a plain revert can only be satisfied by rewriting history. Carried from the duplicate iss-2609100513521322's third acceptance: the trailer should be written when the message is written (a commit template or a prepare-commit-msg hook), not demanded after.

git revert writes no Assisted-by trailer, and the attribution commit gate (now also on the merge queue and on push to main, iss-280) refuses the message, so a plain revert can only be satisfied by rewriting history. Carried from the duplicate iss-2609100513521322's third acceptance: the trailer should be written when the message is written (a commit template or a prepare-commit-msg hook), not demanded after.

Grounds

• pursued: git revert --no-edit HEAD under git -c abcd.assistedBy=<Vendor>:<model> records a commit carrying that trailer once, and check-attribution.sh passes it; a revert, cherry-pick, squash or amend under a configured value that arrives without the trailer, or any trailer written with the key unset, would show it wrong (internal/surface/cli/githook_preparecommitmsg_test.go drives each source).