5 design patterns for long-running agents: 1. Design your prompts carefully. Keep system instructions and tool definitions at the top and move dynamic memories and runtime data to the end. This enables prompt caching, cutting costs and latency. 2. Move any learnings on your harness to the background. Always reply to the user first, then process memories asynchronously. You never want the harness to slow user interactions. 3. Preserve files, installed tools, and unfinished work between…