AI agents use add_zone_equipment to create or update resources in Openstudio — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Openstudio environment.
This tool creates or modifies zone equipment in a building energy simulation model. While the description is missing (reducing confidence slightly), the 'add_' verb pattern and position within a model-manipulation server indicate it performs Write operations (reversible creation/modification).
From the tool's definition Tool name 'add_zone_equipment' and sibling tools with 'add_' prefix (add_air_loop, add_baseline_system, add_doas_system, add_pv_to_shading, add_output_meter) all perform creation/modification operations within OpenStudio building energy models.
Documented attack patterns abuse exactly the kind of access add_zone_equipment 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 add_zone_equipment:
{
"version": "1",
"default": "deny",
"tools": {
"add_zone_equipment": {
"limits": [
{
"counter": "add_zone_equipment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_zone_equipment stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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add_zone_equipment. It is categorised as a Write tool in the Openstudio MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Openstudio MCP server in PolicyLayer and add a rule for add_zone_equipment: 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.
add_zone_equipment is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add_zone_equipment 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 add_zone_equipment. 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.
add_zone_equipment 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.