Get a second opinion from another model

A model reviewing its own work tends to miss what it missed the first time. A different model, with different habits, catches more. Moneypenny makes that a single @.

@ a reviewer in any coding chat

Make a reviewer bot on the other agent: Codex if the chat runs Claude, Claude if it runs Codex. Mention it in the chat. It reads the work so far and points out the edge cases and mistakes before you ship.

Ask another chat what it knows

Invite a different coding chat into the conversation. It answers from its own worktree and session, so the chat that wrote the payment code can review the change that touches it.

Reviews built into a factory

In a software factory, a role can be an existing bot. The coordinator asks it about each chat's work, and its answer lands in that chat.

Then check it ran

A second opinion is still an opinion. Pair it with a recorded browser test to see the change working.