Docker Sandboxes isolate AI agents in microVMs with egress control and secret masking
mdelapenya · x · 2026-09-08
Testcontainers maintainer mdelapenya details how Docker Sandboxes (sbx) fit into agent architectures: sbx is a microVM with a specialized container runtime, a secrets manager, and network/filesystem policies to keep agents from harming the host.
A main agent like openclaw runs inside a DinD container so it can spawn additional containers on demand — e.g. for testcontainers-based tests (the author is a TC maintainer). The sandbox controls agent egress, allowing or blocking domains on the fly and substituting secrets so the agent never sees real credentials. Sandboxes are declared in compose-like YAML, with full docs available.
Related event: Docker Sandboxes: microVM isolation for AI agents(5 posts)→
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