install_role_from_url

THE RISK

High Risk

Installing a role from a URL involves fetching external code and deploying it into the environment, which is an execution-class action with potential for supply chain risk. The description is empty, lowering confidence, but the name strongly implies executing an install operation from an arbitrary external source, which carries high severity due to potential for malicious code installation.

From the tool's definition Tool name 'install_role_from_url' implies fetching and installing an Ansible role from an external URL, which executes installation operations on the system.

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

HOW TO CONTROL INSTALL_ROLE_FROM_URL

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

policy.json

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

install_role_from_url 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 Ludus FastMCP — 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 Ludus FastMCP tools

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All 201 Ludus FastMCP tools →

Execute tools on other servers

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Go deeper

High-risk tools in Ludus FastMCP → 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 install_role_from_url tool do? +

install_role_from_url. It is categorised as a Execute tool in the Ludus FastMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on install_role_from_url? +

Register the Ludus Fast MCP server in PolicyLayer and add a rule for install_role_from_url: 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 Ludus FastMCP. Nothing to install.

What risk level is install_role_from_url? +

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

Can I rate-limit install_role_from_url? +

Yes. Add a rate_limit block to the install_role_from_url 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 install_role_from_url completely? +

Set action: deny in the PolicyLayer policy for install_role_from_url. 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 install_role_from_url? +

install_role_from_url is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Ludus FastMCP tool call.

Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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// WHAT INSTALL_ROLE_FROM_URL ON LUDUS FASTMCP DOES

// THE RISK

// HOW TO CONTROL INSTALL_ROLE_FROM_URL

// EXPLORE