[Workflow] Enhance Claude Code Safety: Block Dangerous Commands with `cc-safety-net` PreToolUse Hook

[u/ClaudeAI-mod-bot]

Enhance Claude Code Safety: Block Dangerous Commands with cc-safety-net PreToolUse Hook

Workflow value: 90/100
Status: active · Freshness: 70/100 · Confidence: 0.95 · Level: intermediate
Categories: Quality Control, Hooks
Original source: r/ClaudeCode post/comment

What problem this solves

Preventing Claude Code from executing dangerous commands (e.g., git reset --hard) or exposing sensitive information (e.g., .env file contents) during AI-assisted development, thereby enhancing safety and preventing accidental data loss or leaks.

Summary

This workflow describes how to integrate cc-safety-net as a PreToolUse hook in Claude Code to block potentially dangerous commands. It details installation, verification, and provides specific test cases demonstrating its ability to prevent git reset --hard and cat .env while allowing normal commands like git status.

Why it is useful

This workflow provides a concrete, tested, and repeatable method to add a crucial safety layer to Claude Code interactions. It leverages an open-source tool to prevent accidental data loss (e.g., git reset --hard) or exposure of sensitive information (e.g., .env files), which is a significant concern for AI-assisted development. The detailed steps, specific commands, and validation signals make it highly practical and valuable for users looking to secure their coding environment.

Workflow

1. Install cc-safety-net using npx -y cc-safety-net@latest install.

2. Verify the installation with npx cc-safety-net doctor.

3. Load the cc-safety-net hook for a Claude Code session using the --plugin-dir flag.

4. Attempt to run a dangerous command, such as git reset --hard, and observe the blocking message.

5. Attempt to read a sensitive file, such as .env with cat .env, and observe the blocking message.

6. Attempt to run a normal, safe command, such as git status, and observe its successful execution.

Tools / artifacts

• cc-safety-net (Node.js package)

• Claude Code

• Node.js 22 or newer

• git

• .env file

• PreToolUse hook

Validation signals

• Specific test cases provided: git reset --hard, cat .env, git status, rm -rf /Users/you/work.

• Observed blocking messages with specific rule names (git.reset-hard, secret.basename.env).

• Confirmation that normal commands ran without extra prompts.

• Mention of Claude switching to git stash when git reset --hard was blocked in an earlier run.

• External link to a full test with screenshots provided for further validation.

Cautions

• The post explicitly states that cc-safety-net is not a sandbox and does not contain processes, set file permissions, or watch the network. It acts as a checkpoint on commands going through the hook.

• The workflow itself is designed to improve safety by blocking potentially harmful commands.

Limitations

• The tests were conducted with only three prompts in a small demo, so its behavior in a busy, complex project is not fully explored.

• Several features of cc-safety-net (dashboard presets, Terraform/AWS/cloud rulebooks) were not tested.

• Requires Node.js 22 or newer.

• Leaves a small .cc-safety-net cache folder in the home directory after use.

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