A Codex seat that hands over to a new occupant keeps OpenRig's guidance. Since #2441, a fresh Codex launch carries the guidance as launch developer instructions instead of writing AGENTS.md, but a fresh or rebuild handover successor launches without them, so it started with no guidance (a fork very likely too; the put-back covers it). Before the successor launches, the handover now puts the seat's missing guidance blocks back in the repository AGENTS.md from its saved startup context, using the same steps restore uses: only missing blocks are written, the person's text around them is unchanged, and a seat that already has them, or has no saved context, is left alone. A discovered handover launches nothing and is skipped. The startup guide lists a handover successor among the cases that still use the repository AGENTS.md. Part of #875, which stays open.