get_available_family_types

THE RISK

Low Risk

Why get_available_family_types needs a policy

This tool retrieves and queries family type information from the Revit project. It has no side effects—it does not create, modify, delete, or execute operations. It simply returns available data that can be filtered and paginated. This is a classic Read operation with minimal security risk.

From the tool's definition Tool description states 'Get available family types' with filtering and limiting capabilities. The verb 'Get' and the passive data retrieval nature indicate read-only access to project metadata without modification or deletion.

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

POLICY

How to control get_available_family_types

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

policy.json

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

get_available_family_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 Revit MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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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 →
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FAQ

Questions about get_available_family_types

What does the get_available_family_types tool do? +

Get available family types in the current Revit project. You can filter by category and family name, and limit the number of returned types. It is categorised as a Read tool in the Revit MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_available_family_types? +

Register the Revit MCP server in PolicyLayer and add a rule for get_available_family_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 Revit MCP. Nothing to install.

What risk level is get_available_family_types? +

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

Can I rate-limit get_available_family_types? +

Yes. Add a rate_limit block to the get_available_family_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 get_available_family_types completely? +

Set action: deny in the PolicyLayer policy for get_available_family_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 get_available_family_types? +

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

Enforce policy on every Revit MCP tool call.

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

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