Foremerge is the open-source coordination protocol for coding agents, built above Git. Claude Code in one worktree, Codex in another: agents from any provider share intent, semantic claims, dependencies, provisional ChangeSets, decisions, and verification through one store, so plans collide in a queryable database, not in your merge.

Agents say what they are about to do, before they do it.

Say you have two AI agents working on the same project at the same time. Each one gets its own copy of the code, so they never fight over files. Both finish. Both look correct. Then you find they undid each other's work.

Git cannot warn you about that, because Git compares text and not intent. It will stop you when two agents edit the same part of the same file. What it cannot see is two edits that are each perfectly reasonable on their own and land in different files. If one agent moves every caller onto a new StripePaymentService while another adds PayPal support to the old PaymentService, nothing overlaps, so Git merges both without complaint and the PayPal work is left stranded on a class nothing calls any more.