OSS
Microsoft is building mxc, a Rust sandbox for policy-driven layered isolation, in the open at 1,301 stars
microsoft/mxc was created 2026-02-06, sits at 1,301 stars with 70 forks, and was pushed today; it describes itself only as 'policy-driven, layered isolation and containment.' Its backlog is 30 open PRs against 88 open issues, an unusually issue-heavy shape for a first-party repo this small, suggesting real users hitting edges rather than a demo. With agent runtimes now routinely handed shell access, a Microsoft-maintained Rust containment layer is worth tracking against the Docker-per-agent pattern most harnesses use today.
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