guardrails-plugin

guardrails-plugin is a specialized plugin designed for Claude Code that implements strict control measures to enhance project safety and integrity. This plugin introduces crucial features that actively monitor and restrict certain operations, ensuring adherence to best practices while providing insights into the session behavior of Claude.

Key Features

1. Enforcement Hooks (PreToolUse): This feature prevents the execution of destructive shell commands and modifications to sensitive secrets or protected paths before they are executed. Deployment and infrastructure changes require explicit user approval, adding a layer of protection.

2. Session Start Report (SessionStart): Provides a concise checklist summarizing the status of instruction files, rules, skills, hooks, and plugins when a session begins. It indicates whether items are OK, marked with warnings, or skipped, helping users to quickly identify issues.

3. Skills:

   • /guardrails:guardrails-lint: Lints CLAUDE.md against established guidelines.
   • /guardrails:guardrails-status: Displays the current status of guardrails.
   • /guardrails:guardrails-test: Tests commands against the blocklist without executing them, reporting their status as ALLOW, ASK, or DENY.

What it Blocks

The plugin meticulously evaluates every bash command before execution, categorizing them into allowed, denied, or requiring approval. Some examples include:

• Denied: Destructive commands like rm -rf /, force pushes to main branches, and database deletion commands.
• Asks for Approval: Certain operations like DROP TABLE, non-recursive rm outside the project, and modifications to deployment files.
• Allowed: Safe operations within the project directory.

Configuration

Users can customize the plugin through a configuration file .claude/guardrails.json, allowing for dynamic management of commands and paths. This includes specifying which commands to allow or block, and designating protected paths and secrets.

Session Reporting

At each session's start, the plugin generates a detailed report highlighting the load status of configuration and instruction files, warnings for potential issues, and an overall summary of guardrail enforcement, helping maintain project integrity.

Cost and Efficiency

The plugin produces minimal computational overhead during normal operation. The detailed session reports are freely generated and allow for continuous monitoring without burdening the performance of Claude Code sessions. Each denied command incurs a small token cost, manageable within user sessions.

Conclusion

By incorporating guardrails-plugin into a Claude Code workflow, users significantly enhance project safety, mitigate the risk of damaging commands, and ensure compliance with best practices. This plugin serves as a practical guardian during development, fostering a secure coding environment.