Read air loop sizing parameters: supply air temperature, OA fraction, flow rate method.
AI agents call get_sizing_system_properties to retrieve information from Openstudio without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries configuration parameters from an OpenStudio model without modifying, deleting, or executing external operations. It is a straightforward data retrieval operation with no side effects, fitting the Read category. The low severity reflects minimal blast radius—an agent cannot cause damage by reading sizing properties.
From the tool's definition Tool name contains 'get_' and description states 'Read air loop sizing parameters' with examples of read-only data (supply air temperature, OA fraction, flow rate method).
Documented attack patterns abuse exactly the kind of access get_sizing_system_properties gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Openstudio, and nothing reaches the server without passing your rules. This is the rule we recommend for get_sizing_system_properties:
{
"version": "1",
"default": "deny",
"tools": {
"get_sizing_system_properties": {}
}
}get_sizing_system_properties is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read air loop sizing parameters: supply air temperature, OA fraction, flow rate method. It is categorised as a Read tool in the Openstudio MCP Server, which means it retrieves data without modifying state.
Register the Openstudio MCP server in PolicyLayer and add a rule for get_sizing_system_properties: 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. Nothing to install.
get_sizing_system_properties 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_sizing_system_properties 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_sizing_system_properties. 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_sizing_system_properties is provided by the Openstudio MCP server (natlabrockies/openstudio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Openstudio, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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146 Openstudio tools catalogued and risk-classified — across an index of 43,000+ MCP servers.