Calculate material quantities and takeoffs from the current Revit project. Returns detailed information about each material including name, class, area, volume, and element counts. Useful for cost estimation, material ordering, and sustainability analysis.
AI agents call get_material_quantities to retrieve information from Revit MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
get_material_quantities performs data retrieval and analysis only (calculating statistics from existing materials). It has no side effects on the Revit model, does not create or modify elements, and does not execute commands. The blast radius of misuse is minimal—worst case, an AI agent requests unnecessary calculations but cannot damage or alter the project. This is a pure Read operation.
From the tool's definition Tool description states it 'Calculate material quantities and takeoffs' and 'Returns detailed information' — core read operations that retrieve and query existing project data. No modifications, deletions, or execution of arbitrary operations occur.
Documented attack patterns abuse exactly the kind of access get_material_quantities gives an agent:
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_material_quantities:
{
"version": "1",
"default": "deny",
"tools": {
"get_material_quantities": {}
}
}get_material_quantities is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Calculate material quantities and takeoffs from the current Revit project. Returns detailed information about each material including name, class, area, volume, and element counts. Useful for cost estimation, material ordering, and sustainability analysis. It is categorised as a Read tool in the Revit MCP MCP Server, which means it retrieves data without modifying state.
Register the Revit MCP server in PolicyLayer and add a rule for get_material_quantities: 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.
get_material_quantities 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_material_quantities 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_material_quantities. 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_material_quantities 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.
Start from Revit MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
25 Revit MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.