run_tool

THE RISK

High Risk

This tool directly executes arbitrary commands on a REMnux system via Docker, SSH, or local connections. Command execution is inherently high-risk because: (1) it can trigger any installed tool or system utility, (2) piped commands enable complex multi-step operations, (3) the blast radius is unlimited depending on what commands are executed, and (4) while the server provides 'security guardrails,' arbitrary command…

From the tool's definition Tool description states 'Execute a command in REMnux' with support for piped commands, enabling arbitrary command execution.

Documented attack patterns abuse exactly the kind of access run_tool gives an agent:

HOW TO CONTROL RUN_TOOL

PolicyLayer is an MCP gateway — it sits between your AI agents and REMnux MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for run_tool:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "run_tool": {
      "limits": [
        {
          "counter": "run_tool_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

run_tool stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register REMnux MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More REMnux MCP Server tools

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All 14 REMnux MCP Server tools →

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Go deeper

High-risk tools in REMnux MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the run_tool tool do? +

Execute a command in REMnux. Supports piped commands (e.g.,. It is categorised as a Execute tool in the REMnux MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on run_tool? +

Register the REMnux MCP Server MCP server in PolicyLayer and add a rule for run_tool: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches REMnux MCP Server. Nothing to install.

What risk level is run_tool? +

run_tool is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit run_tool? +

Yes. Add a rate_limit block to the run_tool rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block run_tool completely? +

Set action: deny in the PolicyLayer policy for run_tool. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides run_tool? +

run_tool is provided by the REMnux MCP Server MCP server (remnux/remnux-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every REMnux MCP Server tool call.

Deterministic rules across all 14 REMnux MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN REMNUX →

Free to start. No card required.

14 REMnux MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT RUN_TOOL ON REMNUX MCP SERVER DOES

// THE RISK

// HOW TO CONTROL RUN_TOOL

// EXPLORE