Extract envelope thermal properties: wall/roof/floor U-values and
AI agents call extract_envelope_summary 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 summarizes existing thermal properties from an OpenStudio model without creating, modifying, deleting, or executing external operations. It is a data query operation with no side effects, fitting squarely in the Read category. Severity is low because unauthorized access to building model parameters poses minimal direct harm compared to other tool risks.
From the tool's definition Tool name 'extract_envelope_summary' and description 'Extract envelope thermal properties' indicate data retrieval.
Documented attack patterns abuse exactly the kind of access extract_envelope_summary 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_envelope_summary:
{
"version": "1",
"default": "deny",
"tools": {
"extract_envelope_summary": {}
}
}extract_envelope_summary is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Extract envelope thermal properties: wall/roof/floor U-values and. 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_envelope_summary: 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_envelope_summary 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_envelope_summary 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_envelope_summary. 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_envelope_summary 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.