Fence: Lightweight Sandbox Tool for Secure Command Execution with Network and Filesystem Restrictions
By
jy-tan
An everything bagel for the brain. Substantive, layered, well-seasoned.
Summary
Fence is a lightweight, container-free sandbox tool that wraps commands to restrict network access and filesystem operations by default. It's designed for running semi-trusted code like package installs, build scripts, and CI jobs with controlled side effects. The tool also serves as a permission manager for CLI agents, working with popular coding agents like Claude Code, Codex, Gemini CLI, and others. It provides a security layer for executing potentially risky commands without the overhead of full containerization.
Key quotes
· 4 pulledFence wraps commands in a sandbox that blocks network access by default and restricts filesystem operations based on configurable rules.
It's most useful for running semi-trusted code (package installs, build scripts, CI jobs, unfamiliar repos) with controlled side effects.
You can also think of Fence as a permission manager for your CLI agents.
Fence works with popular coding agents like Claude Code, Codex, Amp, Gemini CLI, Cursor Agent, OpenCode, Factory (Droid) CLI, etc.
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