skill-sandbox

Testing Claude Code skills in an isolated sandbox prevents credential exposure by spawning tmux sessions with fake HOME directories and mock dangerous commands, blocking real production deployments while preserving a realistic testing surface.

Yes, this sandboxed testing approach supports both headless and interactive validation across multiple tmux sessions, enabling hook verification, state management, and integration tests within a git worktree workspace.

Yes, you need openssl, jq, tmux, and git installed. These utilities are required to create unique sandboxes, generate fake credentials, and manage the isolated git worktree workspace.

Using a sandboxed tmux environment with mock tooling is the best way to isolate development environments, as it blocks dangerous operations and generates fake credentials for security-focused testing in CI pipelines.

You should use a sandboxed worktree to prevent dangerous operations and production deployments, because testing directly in your production directory risks credential exposure and unintended state changes.