list_levels

THE RISK

Low Risk

Why list_levels needs a policy

This tool queries and returns data about levels in a Revit model without modifying, deleting, or executing any operations. It is a straightforward read operation similar to other query/list tools on the same server (get_current_view_elements, get_revit_model_info). The blast radius of misuse is minimal—an LLM agent could only view architectural information, not modify or damage the model.

From the tool's definition Tool name 'list_levels' and description 'Get a list of all levels in the current Revit model' indicate a retrieval operation with no side effects.

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

POLICY

How to control list_levels

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

policy.json

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

list_levels 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 MCP server for Revit - Python — 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 list_levels

What does the list_levels tool do? +

Get a list of all levels in the current Revit model. It is categorised as a Read tool in the MCP server for Revit - Python MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_levels? +

Register the MCP server for Revit - Python MCP server in PolicyLayer and add a rule for list_levels: 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 server for Revit - Python. Nothing to install.

What risk level is list_levels? +

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

Can I rate-limit list_levels? +

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

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

list_levels is provided by the MCP server for Revit - Python MCP server (mcp-servers-for-revit/mcp-server-for-revit-python). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP server for Revit - Python tool call.

Start from MCP server for Revit - Python, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →