Set glazing ratio on an exterior wall — adds a centered window by window-to-wall ratio.
AI agents use set_window_to_wall_ratio 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 new window geometry in the building energy model, which is a reversible modification (windows can be removed or adjusted). It does not execute simulations, delete data irreversibly, or cause financial transactions. While it modifies model state, the changes are non-destructive and typical of Write category tools in CAD/BIM contexts.
From the tool's definition Tool description states 'adds a centered window by window-to-wall ratio' — this modifies the building model by creating/adding window objects to exterior walls. The verb 'adds' indicates data creation/modification.
Documented attack patterns abuse exactly the kind of access set_window_to_wall_ratio 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 set_window_to_wall_ratio:
{
"version": "1",
"default": "deny",
"tools": {
"set_window_to_wall_ratio": {
"limits": [
{
"counter": "set_window_to_wall_ratio_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_window_to_wall_ratio 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.
Free to start. No card required.
Set glazing ratio on an exterior wall — adds a centered window by window-to-wall ratio. 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 set_window_to_wall_ratio: 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.
set_window_to_wall_ratio 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 set_window_to_wall_ratio 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 set_window_to_wall_ratio. 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.
set_window_to_wall_ratio 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.