/**
* Paid tool: metered_feature
* Uses metered/usage-based Stripe billing
*/
import { z } from "zod";
import { PAYMENT_REASONS } from "../../billing/stripe.js";
import type { Env } from "../../worker/env.js";
import type { MKitMCP } from "../../worker/mcp.js";
export function registerMeteredTool(
agent: MKitMCP,
env: Env
): void {
const priceId = env.STRIPE_METERED_PRICE_ID;
const baseUrl = env.BASE_URL;
if (!priceId || !baseUrl) {
console.warn("Metered tool not configured: missing STRIPE_METERED_PRICE_ID or BASE_URL");
return;
}
agent.paidTool(
"metered_feature",
"A premium feature using metered billing. Your first 3 uses are free, then we charge 10 cents per use.",
{ a: z.number(), b: z.number() },
async ({ a, b }: { a: number; b: number }) => ({
content: [{ type: "text", text: String(a + b) }],
}),
{
checkout: {
success_url: `${baseUrl}/payment/success`,
line_items: [
{
price: priceId,
},
],
mode: "subscription",
},
meterEvent: "metered_add_usage",
paymentReason:
"METER INFO: Your first 3 additions are free, then we charge 10 cents per addition. " +
PAYMENT_REASONS.METERED,
}
);
}
