Simon Willison built RTS Battle Drones with AI agents in 321 commits

Developer Simon Willison built Battle Drones, a browser-based Command & Conquer-style RTS, by telling Claude Code to "make it more fun." Coding agents made 321 commits with no code written by Willison, and an overnight run of 1,200 simulated matches cut undecided games from 14% to 0.9%.

• 321 commits were made by AI agents; Willison wrote no code himself
• An overnight run of 1,200 matches cut undecided games from 14% to 0.9%
• Comeback wins rose from 24% to 46% after rebalancing
• Multiplayer uses an audio modem; a Fly.io relay costs $2.19 per month