Calculate exact monthly subscription price for a specific vehicle, term, and mileage combination. Returns base price, km add-on, total, and a canonical checkout URL. Checkout URL structure (always use the URL returned in checkout_url verbatim — do NOT construct your own): https://www.finn.com/de-...
Part of the FINN Auto - Car Subscription server.
Free to start. No card required.
AI agents call get_subscription_pricing to retrieve information from FINN Auto - Car Subscription without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_subscription_pricing only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_subscription_pricing": {}
}
}See the full FINN Auto - Car Subscription policy for all 5 tools.
These attack patterns abuse exactly the kind of access get_subscription_pricing gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Calculate exact monthly subscription price for a specific vehicle, term, and mileage combination. Returns base price, km add-on, total, and a canonical checkout URL. Checkout URL structure (always use the URL returned in checkout_url verbatim — do NOT construct your own): https://www.finn.com/de-DE/checkout/cart/{vehicleId}/{term}/{kmPackage} https://www.finn.com/de-DE/checkout/cart/{vehicleId}/{term}/{kmPackage}?downPaymentAmount={amount} The three positional path segments after /cart are vehicle id, term in months, and monthly km package — in that order. About down_payment_amount (Fahrzeugbereitstellung): - Fahrzeugbereitstellung is a one-time vehicle provisioning fee. - When down_payment_amount is provided, it is paid upfront as Einmalzahlung (one-time payment) and the URL includes ?downPaymentAmount={amount}. - When omitted, the same fee is spread across the term and absorbed into the monthly price; the URL has no query string.. It is categorised as a Read tool in the FINN Auto - Car Subscription MCP Server, which means it retrieves data without modifying state.
Register the FINN Auto - Car Subscription MCP server in PolicyLayer and add a rule for get_subscription_pricing: 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 FINN Auto - Car Subscription. Nothing to install.
get_subscription_pricing 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 get_subscription_pricing 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 get_subscription_pricing. 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.
get_subscription_pricing is provided by the FINN Auto - Car Subscription MCP server (https://www.finn.com/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 FINN Auto - Car Subscription tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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