Cross-repository coding agent coordination

Cross-repository coding agents are most effective when coordinated changes follow an explicit dependency and compatibility plan rather than parallel, isolated edits. Teams should identify every repository that produces or consumes an interface, define sources of truth, owners, checks, release order, and whether changes are additive or require transitional compatibility, such as expand-and-contract database migrations. Work can then be divided into milestones covering contracts, producer updates, consumer updates, and eventual removal of legacy paths, with a coordinator maintaining shared state while repository owners retain approval authority. Separate branches or worktrees prevent file conflicts, while durable records of interface versions, blockers, rollout decisions, and validation results help focused workers remain aligned. Because local tests may pass despite system-level failures, final validation should test exact producer and consumer revisions together, confirm generated clients and version constraints, and verify deployment manifests, with completion withheld until cross-repository evidence succeeds.

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