Better Prompts Won't Fix Your AI Agents — Infrastructure Will Every "how to work with AI agents" guide starts with prompt engineering. Be specific. Give examples. Set context. That's fine for one agent, one session. It completely falls apart when you have 20 agents running concurrently, each with different contexts, hitting the same files, and none of them remembering what the others did. Better prompts won't fix that. Infrastructure will. The Problem Nobody Talks About Here's what actually breaks when you run multiple agents: Concurrent file writes. Agent A reads a file. Agent B writes to it. Agent A's context is now stale. Credential access. Touch ID doesn't work from cron. Your agents can't unlock your password manager at 3am. Silent failures. An agent hits an error on a recurring cron job. You don't notice for three days. Context starvation. Your agent's context window fills with irrelevant details. It can't reason about the actual problem. None of these are prompt problems.…