Trail of Bits open-sources Coop: isolated VMs for Claude Code and Codex

Coop – Isolated VM Environments for Running Claude Code and Codex

Trail of Bits open-sourced Coop, an internal tool that wraps Claude Code and OpenAI Codex inside isolated VMs. It prevents AI coding agents from accidentally messing up the host machine when they edit files or run commands. The repo has 309 commits and 35 stars. The README doesn't spell out supported VM backends, resource overhead, or how it compares to plain Docker or sandboxing.

Why it matters: Trail of Bits open-sourced an internal isolation tool for AI coding agents with 309 commits—it's a real tool, not a demo. Hits all three HKR axes: concrete pain point, engineering detail, and developer security anxiety. Score capped because the README doesn't specify VM backen...