AI agents use create_plant_loop 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 a new plant loop object in an OpenStudio building energy simulation model. Plant loops are reversible model components that can be deleted or modified. While the tool modifies the simulation model state, it does not irreversibly destroy data, execute arbitrary code, or involve financial operations. It is classified as Write.
From the tool's definition Tool name 'create_plant_loop' indicates creation of a new model component. Sibling tools like 'add_air_loop', 'add_baseline_system', and 'add_demand_component' are all Write operations that modify building energy simulation models.
Documented attack patterns abuse exactly the kind of access create_plant_loop 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 create_plant_loop:
{
"version": "1",
"default": "deny",
"tools": {
"create_plant_loop": {
"limits": [
{
"counter": "create_plant_loop_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_plant_loop 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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create_plant_loop. 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 create_plant_loop: 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.
create_plant_loop 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 create_plant_loop 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 create_plant_loop. 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.
create_plant_loop 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.