Run several AI coding agents in parallel and their branches collide the moment you merge — and you find out one at a time, after every agent has finished. Braidkeep predicts conflicts between in-flight branches using Git's own merge-tree (read-only, never touches your working tree), enforces per-agent file ownership, and computes a safe merge order: conflict-free batches first, tangles last. Any orchestrator. Single binary, Apache-2.0, free. Predicts mergeability, not correctness.