Microsoft's Open-Source MXC Sandbox Slows git by 124x in Test

Microsoft open-sourced MXC, a JSON-policy sandbox for AI coding agents that has gained 2.7k stars, but Daniel Lemire's benchmark found git commands slow from 10ms to 1.24 seconds.

2026-10-13 ~ 2026-10-13 · 2 related posts

• Benchmarking Microsoft's MXC sandbox: git jumps from 10ms to 1.24s without a writable temp dir — lemire · 2026-10-13
• Microsoft open-sources MXC, a policy-driven sandbox for running AI agents safely — lemire · 2026-10-13