calculate_mortgage_affordability

THE RISK

Low Risk

Why calculate_mortgage_affordability needs a policy

This is a computational analysis tool that returns calculated results based on user-provided inputs. It retrieves or computes financial information for educational and planning purposes without creating persistent changes, executing external operations, or affecting actual financial systems.

From the tool's definition Tool performs calculations and analysis ('calculator', 'analysis') on affordability metrics and debt-to-income ratios. The description indicates it analyzes and computes values from input parameters without modifying, creating, or deleting any data.

Documented attack patterns abuse exactly the kind of access calculate_mortgage_affordability gives an agent:

POLICY

How to control calculate_mortgage_affordability

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 calculate_mortgage_affordability:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "calculate_mortgage_affordability": {}
  }
}

calculate_mortgage_affordability is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register RealVest Real Estate MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about calculate_mortgage_affordability

What does the calculate_mortgage_affordability tool do? +

Advanced mortgage affordability calculator with dual income and detailed DTI analysis. It is categorised as a Read tool in the RealVest Real Estate MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on calculate_mortgage_affordability? +

Register the RealVest Real Estate MCP Server MCP server in PolicyLayer and add a rule for calculate_mortgage_affordability: 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.

What risk level is calculate_mortgage_affordability? +

calculate_mortgage_affordability is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit calculate_mortgage_affordability? +

Yes. Add a rate_limit block to the calculate_mortgage_affordability 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.

How do I block calculate_mortgage_affordability completely? +

Set action: deny in the PolicyLayer policy for calculate_mortgage_affordability. 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.

What MCP server provides calculate_mortgage_affordability? +

calculate_mortgage_affordability 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.

Enforce policy on every RealVest Real Estate MCP Server tool call.

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.

CHECK YOUR STACK →