Darce

Darce is the coding agent you can undo. It works in your terminal with 250+ models (Claude, GPT, Gemini, Qwen, DeepSeek, Kimi), and every change it makes, even what its shell commands did, rolls back with /undo. Anything risky asks first. /swarm splits a task across parallel agents in separate git worktrees. /derby races 3 models on the same task so you keep the best diff. MIT open source. Try it free: 10 requests, no account.