Simon Willison's Battle Drones, an RTS built by coding agents

What the research found

Battle Drones is a browser-based RTS by Simon Willison built mostly by coding agents over 12 iterations and 321 commits, with two-device multiplayer synced over microphone audio.

Claims and how well the evidence supports them

1. Battle Drones is a browser-based RTS built mostly with Claude Code over 12 iterations and 321 commits 98%
2. Multiplayer works between two devices within microphone range using audio to sync game state 99%
3. The game includes six maps across five biomes and a random map generator 99%

Evidence

• simonwillison.net https://simonwillison.net/2026/Oct/20/battledrones

Actionability rated low.