Add a rate plan charge to a subscription rate plan. POST .../rateplan-charges. Required: subscriptionId, ratePlanId, quantity, name, category (physical|digital), chargeModel (flatFeePricing|perUnitPricing|tieredPricing|volumePricing), billCycleType (chargeTriggerDay|defaultFromCustomer|specificDa...
AI agents use add_subscription_rate_plan_charge to commit financial operations through Rebillia MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool modifies billing structures and adds charges that directly affect customer payments and financial obligations. While it creates/modifies billing data (Write category), the primary function is committing financial charges to subscriptions, making it Financial. The 'chargeType' parameter (oneTime|recurring|usage) indicates this establishes payment obligations. Financial > Write in severity hierarchy.
From the tool's definition Tool adds charges to subscription rate plans with monetary pricing models (flatFeePricing, perUnitPricing, tieredPricing, volumePricing) and currency/price parameters.
Attacks that exploit this kind of access
Add a rate plan charge to a subscription rate plan. POST .../rateplan-charges. Required: subscriptionId, ratePlanId, quantity, name, category (physical|digital), chargeModel (flatFeePricing|perUnitPricing|tieredPricing|volumePricing), billCycleType (chargeTriggerDay|defaultFromCustomer|specificDayOfMonth|specificDayOfWeek|specificMonthOfYear|subscriptionStartDay|subscriptionFreeTrial), chargeTier array (each: currency, price required; optional startingUnit, endingUnit, priceFormat, tier), chargeType (oneTime|recurring|usage), endDateCondition (subscriptionEnd|fixedPeriod), taxable (boolean), weight. When chargeType is recurring, billingPeriodAlignment and specificBillingPeriod are also required. Optional: productRatePlanChargeId, billingPeriod, billingTiming. It is categorised as a Financial tool in the Rebillia MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Rebillia MCP Server MCP server in PolicyLayer and add a rule for add_subscription_rate_plan_charge: 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 Rebillia MCP Server. Nothing to install.
add_subscription_rate_plan_charge is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the add_subscription_rate_plan_charge 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 add_subscription_rate_plan_charge. 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.
add_subscription_rate_plan_charge is provided by the Rebillia MCP Server MCP server (rhinosaas/rebillia-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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