Anthropic's Sandbox Runtime: OS-Level Sandboxing Without Containers

Fri, 01 May 2026 00:00:00 +0000

AI coding agents like Claude Code need to execute a wide range of operations – reading files, writing code, running commands, making network requests. Managing the security boundaries around these operations has typically required either heavy containerization (Docker) or frequent user permission prompts. Sandbox Runtime by Anthropic offers a third path: lightweight, OS-level sandboxing that enforces security policies without the overhead of containers.

The tool works by leveraging the operating system’s built-in sandboxing capabilities – seatbelt profiles on macOS and seccomp-bpf with landlock on Linux – to define precise boundaries for what agent processes can and cannot do. Rather than asking the user for permission on every operation, Sandbox Runtime pre-configures what is allowed and blocks everything else automatically.

Sandbox-Runtime on SoloSoft

Anthropic's Sandbox Runtime: OS-Level Sandboxing Without Containers