Docker Sandboxes Are a Meaningful Step Toward Safer Coding Agents — Here's What Still Matters

Docker Sandboxes, a recently announced feature, provides a containerized environment that allows coding agents to work on project files without exposing the entire system, marking a significant step forward in agent tooling maturity. This approach addresses the need for environment isolation, filesystem boundaries, reproducible workspaces, and protection from untrusted local code, aligning well with modern developers' needs. However, Docker Sandboxes primarily tackle the execution layer, leaving other aspects of agent safety, such as permissions and capabilities across systems, unaddressed. The article discusses a layered model for enhancing agent safety, highlighting the importance of least privilege access, proper authentication, execution sandboxing, auditing, and human approval for high-impact actions. The future of agent safety appears to be moving towards a centralized control plane model, like Arcade.dev, which focuses on authorization, governance, and visibility across multi-user agents, complementing the foundational execution safety provided by Docker Sandboxes.