Why AI Browser Agents Need a Runbook Before They Need More Prompts

When an AI browser agent fails, the first instinct is often to rewrite the prompt. Make it clearer. Add more steps. Add more warnings. Tell the agent to be careful. That can help sometimes. But in real browser workflows, especially workflows involving logged-in accounts, persistent browser profiles, proxies, and human review, the problem is often not the prompt. The problem is that the agent has no runbook. A prompt tells the agent what you want. A runbook tells the agent how to operate...