Show HN: Castellan – A real-time strategy game for agents (rts.emersoftware.cl)

In an RTS game, making decisions quickly matters as much as making good ones. Looking for the balance between cost, speed and intelligence in agents, I started wondering what an agent playing an RTS would look like. So I built a simple RTS, and I keep making it more complex.

- The game keeps running while the agent thinks

- The agent can upload a JavaScript script for each unit type

- 300+ game replays

- Connects through MCP or CLI. Works with Claude Code, Codex, Cursor CLI, Antigravity CLI, OpenCode, OpenClaw, DeepSeek Harness and MiniMax Code

- 2 to 6 players, FFA and co-op, open and walled maps

- 4 units, the King and 4 buildings

- Open source, written in TypeScript