lookup_mime_types

THE RISK

Low Risk

Why lookup_mime_types needs a policy

This tool retrieves MIME type information based on file extension queries. It is a read-only operation that returns reference data without side effects. There is no capability to modify, execute, delete, or perform financial operations. The blast radius of misuse is minimal—an attacker might gather information about file type associations but cannot directly compromise systems or data integrity.

From the tool's definition Tool description states 'Look up MIME types for file extensions' - a pure lookup/retrieval operation with no data modification, deletion, or code execution.

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

POLICY

How to control lookup_mime_types

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "lookup_mime_types": {}
  }
}

lookup_mime_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register IT Tools 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about lookup_mime_types

What does the lookup_mime_types tool do? +

Look up MIME types for file extensions. It is categorised as a Read tool in the IT Tools MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on lookup_mime_types? +

Register the IT Tools MCP Server MCP server in PolicyLayer and add a rule for lookup_mime_types: 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 IT Tools MCP Server. Nothing to install.

What risk level is lookup_mime_types? +

lookup_mime_types is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit lookup_mime_types? +

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

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

lookup_mime_types is provided by the IT Tools MCP Server MCP server (wrenchpilot/it-tools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every IT Tools MCP Server tool call.

Start from IT Tools MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →