Cross-Repo Handoff Protocol: Coordinating AI Coding Agents Across Separate Repositories

AI coding agents are getting incredibly good at working inside a single repository. They can inspect files, pick up on local conventions, write tests, and churn out solid code. But let's be real: modern software products are rarely confined to a single repo. When you're building a new feature, you're usually touching a backend API, a frontend UI, maybe a mobile app, infrastructure, and shared packages. Not to mention updating documentation and analytics events. This brings up a fascinating new c