AI agents call list_materials to retrieve information from OpenStudio MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool most likely retrieves or enumerates materials defined in an OpenStudio building energy model, returning data with no side effects. The 'list' prefix strongly suggests a read operation. While the description is empty (lowering confidence slightly), the functional context and tool naming pattern make classification as Read appropriate.
From the tool's definition Tool name 'list_materials' with no description indicates a query/retrieval operation. The naming convention (list_*) and context within an energy modeling tool suggest it retrieves material data from the OSM model without modification.
Documented attack patterns abuse exactly the kind of access list_materials gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OpenStudio MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_materials:
{
"version": "1",
"default": "deny",
"tools": {
"list_materials": {}
}
}list_materials is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_materials. It is categorised as a Read tool in the OpenStudio MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OpenStudio MCP Server MCP server in PolicyLayer and add a rule for list_materials: 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 OpenStudio MCP Server. Nothing to install.
list_materials 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 list_materials 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 list_materials. 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.
list_materials is provided by the OpenStudio MCP Server MCP server (roruizf/openstudio-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OpenStudio MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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20 OpenStudio MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.