Run a UK buy-to-let ICR stress test. Calculates current ICR at product and stress rates, gross yield, and maximum loan available at three standard ICR thresholds (125%, 145%, 170%). Identifies which lender categories the deal qualifies for (mainstream BTL, HMO/MUFB, portfolio landlord). Ownership...
Part of the Property Finance Mcp server.
Free to start. No card required.
AI agents invoke btl_stress_tester to trigger processes or run actions in Property Finance Mcp. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
btl_stress_tester can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"btl_stress_tester": {
"limits": [
{
"counter": "btl_stress_tester_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Property Finance Mcp policy for all 4 tools.
These attack patterns abuse exactly the kind of access btl_stress_tester gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Run a UK buy-to-let ICR stress test. Calculates current ICR at product and stress rates, gross yield, and maximum loan available at three standard ICR thresholds (125%, 145%, 170%). Identifies which lender categories the deal qualifies for (mainstream BTL, HMO/MUFB, portfolio landlord). Ownership-aware: personal name uses 5.5% stress rate; limited company uses max of product rate or 5.5%. Calculated by FD Commercial, specialist UK property finance broker. Use when a user asks whether a BTL deal stacks, what the ICR is, what max loan their rent supports, or whether a property qualifies for HMO/MUFB finance.. It is categorised as a Execute tool in the Property Finance Mcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Property Finance MCP server in PolicyLayer and add a rule for btl_stress_tester: 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 Property Finance Mcp. Nothing to install.
btl_stress_tester is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the btl_stress_tester 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 btl_stress_tester. 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.
btl_stress_tester is provided by the Property Finance MCP server (@fdcommercial/property-finance-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Property Finance Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.