An automation can run on its repositories together

A schedule or webhook automation now has a Run on the repositories together option under Scope: one run, one agent, reading every repository in scope at once (up to 10) instead of one run per repository. For a shared section library and the themes that vendor it, or a monorepo split across repositories, the agent sees both sides of a change. Every tool takes a repository argument, each repository the agent edits gets its own pull request against its default branch, and the pull requests name each other.