A Monorepo is a Context Boundary

The monorepo debate used to be about tooling overhead and org preferences. Those tradeoffs are real.
But there's a second argument now that flips the calculus.
When a fleet of agents has to reason over a change, can they see the whole system? Split repos mean split context. A fix in service A that quietly breaks service B goes undetected because nothing is looking at both.
One repo isn't a preference. It's the context boundary the whole system needs, for humans and agents both.