Would you let a coding agent merge its own work into main?

Description and use

Automatic merging of an agent’s changes into main speeds workflow but requires safeguards to avoid self‑validated code.

Problem

Should a coding agent automatically merge its own changes into the main branch after passing tests, and what safeguards are needed?

Outcome

Automatic merging can speed workflow for small, tested changes but risks merging self‑validated code if tests are written by the agent.

Workflow

• Agent makes changes on its branch
• Agent finishes a turn and leaves changes
• Styx brings main into the branch
• Styx runs project checks
• If checks pass, Styx merges branch into main; otherwise, merge is stopped and chat explains why

Evidence

I added exactly that setting to a tool I'm building, Styx: 'Land on its own when the agent goes quiet and the checks pass'. It's off by default.

Source

The obvious problem is that the checks are only as good as the tests. And the agent may have written some of those tests itself, so green can mean 'it agrees with itself'.

Source

The argument for it is that a quick merge of a small, checked change is how people already work on a branch they own, and a bad merge is a revert away.

Source