The Questions Every Team Asks About Docker Sandboxes
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Docker Sandboxes, launched in March 2026, use microVMs to provide stronger isolation for AI coding agents like Claude Code and Codex. Unlike containers, each sandbox gets its own dedicated kernel, preventing host compromise. Key features include Sandbox Kits (YAML-based configuration artifacts for customizing environments), a host-side proxy that injects credentials without exposing secrets inside the sandbox, and a standalone sbx CLI that doesn't require Docker Desktop. The post addresses common developer questions about why microVMs were chosen over containers, why Docker built its own VMM instead of using Firecracker (cross-platform macOS/Windows support), and current limitations like missing automatic port publishing.
