AI agents call get_available_family_types to retrieve information from Revit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
get_available_family_types is a read-only operation that queries and lists available BIM element families. It has no side effects, does not modify project state, and poses minimal risk if invoked by an AI agent. The filtering and limiting parameters are safe query controls.
From the tool's definition Tool retrieves 'available family types' with filtering and limits—a query operation that returns project metadata without modifying, deleting, or executing external operations.
Attacks that exploit this kind of access
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 Server, which means it retrieves data without modifying state.
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. Nothing to install.
get_available_family_types is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
get_available_family_types is provided by the Revit MCP server (mohamed-elnahla/revit-mcp-github-copilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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