Calculate returns from house hacking (living in one unit and renting others)
AI agents call evaluate_house_hack to retrieve information from RealVest Real Estate MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a real estate calculator that analyzes and displays financial projections for a house hacking investment strategy. It reads input parameters (property details, expenses, rental income) and computes return metrics. The tool performs no write operations on user data, does not execute transactions, does not delete or destroy data, and does not move actual money.
From the tool's definition The tool description indicates it 'Calculate[s] returns from house hacking'—a computational analysis task that retrieves or processes financial data to produce projections, with no indication of making actual transactions, modifying user data, or executing…
Documented attack patterns abuse exactly the kind of access evaluate_house_hack gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and RealVest Real Estate MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for evaluate_house_hack:
{
"version": "1",
"default": "deny",
"tools": {
"evaluate_house_hack": {}
}
}evaluate_house_hack is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Calculate returns from house hacking (living in one unit and renting others). It is categorised as a Read tool in the RealVest Real Estate MCP Server MCP Server, which means it retrieves data without modifying state.
Register the RealVest Real Estate MCP Server MCP server in PolicyLayer and add a rule for evaluate_house_hack: 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 RealVest Real Estate MCP Server. Nothing to install.
evaluate_house_hack 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 evaluate_house_hack 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 evaluate_house_hack. 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.
evaluate_house_hack is provided by the RealVest Real Estate MCP Server MCP server (sigaihealth/realvestmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from RealVest Real Estate MCP Server, 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.
33 RealVest Real Estate MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.