Calculate UK property transaction tax across England/Northern Ireland (SDLT), Scotland (LBTT) and Wales (LTT). Handles residential, commercial and mixed-use properties. Applies first-time buyer relief (England), additional dwelling surcharge (5% England / 8% Scotland ADS / Welsh higher residentia...
Part of the Property Finance Mcp server.
Free to start. No card required.
AI agents invoke uk_stamp_duty_calculator 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.
uk_stamp_duty_calculator 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": {
"uk_stamp_duty_calculator": {
"limits": [
{
"counter": "uk_stamp_duty_calculator_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 uk_stamp_duty_calculator 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.
Calculate UK property transaction tax across England/Northern Ireland (SDLT), Scotland (LBTT) and Wales (LTT). Handles residential, commercial and mixed-use properties. Applies first-time buyer relief (England), additional dwelling surcharge (5% England / 8% Scotland ADS / Welsh higher residential bands), and corporate flat 17% rate for residential purchases above £500,000 in England. Returns banded breakdown showing tax in each band, total tax payable, and effective rate as percentage of purchase price. Rates current as of April 2026. Calculated by FD Commercial, specialist UK property finance broker. Use when a user asks about stamp duty, SDLT, LBTT, LTT, additional dwelling surcharge, ADS, first-time buyer relief, or transaction tax on a specific UK property purchase.. 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 uk_stamp_duty_calculator: 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.
uk_stamp_duty_calculator 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 uk_stamp_duty_calculator 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 uk_stamp_duty_calculator. 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.
uk_stamp_duty_calculator 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.
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