AI agents call validate_osw to retrieve information from Openstudio without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs validation (a read-only inspection operation) of OpenStudio Workflow (OSW) JSON configuration files and their references. Validation checks syntax and consistency but does not modify data, execute simulations, or produce irreversible changes.
From the tool's definition Tool name 'validate_osw' and description 'Validate OSW JSON and referenced files (best-effort)' indicate inspection/verification without modification. The verb 'validate' denotes checking or querying state, not altering or executing external operations.
Documented attack patterns abuse exactly the kind of access validate_osw 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 validate_osw:
{
"version": "1",
"default": "deny",
"tools": {
"validate_osw": {}
}
}validate_osw is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Validate OSW JSON and referenced files (best-effort). It is categorised as a Read tool in the Openstudio MCP Server, which means it retrieves data without modifying state.
Register the Openstudio MCP server in PolicyLayer and add a rule for validate_osw: 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.
validate_osw is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the validate_osw 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 validate_osw. 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.
validate_osw 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.