AI agents use add_cost_per_floor_area 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 cost-related metadata in a building energy simulation model. It does not delete data (Destructive), execute external code (Execute), or move money (Financial). As a Write operation that adds cost parameters to a model, misuse could lead to incorrect building cost analysis but the impact is limited to data modification within the simulation context, warranting medium severity.
From the tool's definition Tool name 'add_cost_per_floor_area' indicates creation/modification of cost data in an OpenStudio energy model. The 'add_' prefix and context of modifying building simulation models classify this as a Write operation.
Documented attack patterns abuse exactly the kind of access add_cost_per_floor_area 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_cost_per_floor_area:
{
"version": "1",
"default": "deny",
"tools": {
"add_cost_per_floor_area": {
"limits": [
{
"counter": "add_cost_per_floor_area_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_cost_per_floor_area 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_cost_per_floor_area. 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_cost_per_floor_area: 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_cost_per_floor_area 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_cost_per_floor_area 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_cost_per_floor_area. 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_cost_per_floor_area 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.