DCG Guard

An OpenClaw plugin that hard-blocks dangerous shell commands before they execute. Works on any OpenClaw installation (Windows, macOS, Linux, local, VPS, anywhere). No binary dependencies required.

What It Does

Intercepts every exec/bash tool call via OpenClaw's before_tool_call plugin event. Pipes the command through DCG (Dangerous Command Guard). Safe commands pass silently with zero overhead. Dangerous commands are blocked before execution.

Blocked (Unix): rm -rf ~, git push --force, git reset --hard, git clean -fd, git branch -D Blocked (Windows): Remove-Item -Recurse -Force, rd /s /q, del /s, Format-Volume, reg delete HKLM Allowed: ls, cat, echo, git status, npm install, dir, Get-ChildItem

Install

# After clawhub install dcg-guard:
bash install.sh

Or manually:

# 1. Install DCG binary
curl -sSL https://raw.githubusercontent.com/Dicklesworthstone/destructive_command_guard/master/install.sh | bash

# 2. Link plugin into OpenClaw
openclaw plugins install -l /path/to/dcg-guard
openclaw gateway restart

How It Works

1. Agent calls exec with a command
2. Plugin intercepts via before_tool_call (runs before execution)
3. Command is checked against built-in rules (cross-platform, \x3C1ms, no subprocess)
4. If no built-in match and DCG binary is installed, command is piped to DCG (~27ms)
5. Safe: silent passthrough, agent never knows the plugin exists
6. Dangerous: { block: true } returned to OpenClaw, command never executes

v1.1.0: Built-in rules work without the DCG binary. DCG binary is optional (adds extra unix rules). Windows fully supported out of the box.

Security

• No shell interpolation. Commands are passed to DCG via stdin using execFileSync (not execSync). No injection risk.
• Fail-open. If DCG binary is missing or crashes, commands pass through. The plugin never deadlocks your agent.
• Zero dependencies. Only requires the DCG binary (single Go binary, no runtime deps).

Configuration

Optional, in openclaw.json under plugins.entries.dcg-guard.config:

{
  "enabled": true,
  "dcgBin": "/custom/path/to/dcg"
}

Default DCG path: ~/.local/bin/dcg

Override with env var: DCG_BIN=/path/to/dcg

Agent Instructions (optional)

Add to your workspace AGENTS.md:

When a command is blocked by DCG Guard, do NOT retry it.
Ask the user for explicit permission before attempting any alternative.
The block exists because the command is destructive or irreversible.