add_url · Mcp Elevenreader MCP: Risk & Policy

WHAT IT DOES

What add_url does on Mcp Elevenreader

AI agents use add_url to create or update resources in Mcp Elevenreader — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Elevenreader environment.

WHY IT NEEDS A POLICY

Why add_url needs a policy

This tool creates a new document/resource entry in the ElevenReader library by accepting a URL. It is reversible (the entry can be deleted via sibling tool 'delete_read'), produces no external side effects beyond storage, and does not execute arbitrary code or access financial systems.

From the tool's definition Tool name 'add_url' and description 'Add a URL to the library for text-to-speech reading' indicate creation of a new library entry. The verb 'Add' combined with the action of importing a URL into the system constitutes data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_url Rate-limited

add_url stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_url": {
      "limits": [
        {
          "counter": "add_url_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Elevenreader, so you can run agents against it safely.

FAQ

Questions about add_url

What does the add_url tool do? +

Add a URL to the library for text-to-speech reading. It is categorised as a Write tool in the Mcp Elevenreader MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_url? +

Register the Mcp Elevenreader MCP server in PolicyLayer and add a rule for add_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 Mcp Elevenreader. Nothing to install.

What risk level is add_url? +

add_url is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_url? +

Yes. Add a rate_limit block to the add_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 add_url completely? +

Set action: deny in the PolicyLayer policy for add_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 add_url? +

add_url is provided by the Mcp Elevenreader MCP server (mit9/mcp-elevenreader). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.