Create a new space with optional building story and space type assignment.
AI agents use create_space 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 entities in an energy simulation model, which is a reversible write operation. It does not execute simulations, delete data, or move financial resources. The severity is medium because misconfiguration of spaces could lead to invalid energy models, but the operation itself is non-destructive and can be modified or undone by creating corrected spaces or deleting the created ones.
From the tool's definition Tool name 'create_space' and description states it will 'Create a new space' which is a data creation operation. The mention of 'optional building story and space type assignment' indicates modification of model structure.
Documented attack patterns abuse exactly the kind of access create_space 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_space:
{
"version": "1",
"default": "deny",
"tools": {
"create_space": {
"limits": [
{
"counter": "create_space_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_space 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 a new space with optional building story and space type assignment. 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_space: 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_space 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_space 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_space. 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_space 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.