Extract autosized HVAC capacities and airflows: zone heating/cooling
AI agents call extract_hvac_sizing 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 autosized HVAC parameters (capacities and airflows) from an OpenStudio model after simulation. The word 'extract' indicates data retrieval only. There is no creation, modification, deletion, or execution of external operations—merely reading calculated results from the energy simulation. This is a low-severity Read operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'extract_hvac_sizing' and description 'Extract autosized HVAC capacities and airflows' indicate retrieval of existing simulation data without modification or side effects.
Documented attack patterns abuse exactly the kind of access extract_hvac_sizing 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 extract_hvac_sizing:
{
"version": "1",
"default": "deny",
"tools": {
"extract_hvac_sizing": {}
}
}extract_hvac_sizing is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Extract autosized HVAC capacities and airflows: zone heating/cooling. 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 extract_hvac_sizing: 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.
extract_hvac_sizing 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 extract_hvac_sizing 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 extract_hvac_sizing. 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.
extract_hvac_sizing 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.
Free to start. No card required.
146 Openstudio tools catalogued and risk-classified — across an index of 43,000+ MCP servers.