import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import type { CallToolResult } from '@modelcontextprotocol/sdk/types.js';
import { Actor, log } from 'apify';
import { z } from 'zod';
import { convertCurrency } from '../providers/index.js';
import { resolveCurrency } from '../utils/validation.js';
export function registerConvertCurrency(server: McpServer): void {
server.registerTool(
'convert_currency',
{
description:
'Convert an amount from one currency to another. '
+ 'Supports 60+ fiat currencies (USD, EUR, GBP, INR, AED, etc.) and 30+ cryptocurrencies (BTC, ETH, SOL, etc.). '
+ 'Accepts ISO 4217 codes, crypto symbols, or natural language (e.g., "dollars", "bitcoin", "rupees").',
inputSchema: {
amount: z.number().positive().max(1_000_000_000_000).describe('Amount to convert'),
from: z.string().min(1).max(20).describe('Source currency code or name (e.g., "USD", "BTC", "dollars")'),
to: z.string().min(1).max(20).describe('Target currency code or name (e.g., "EUR", "INR", "bitcoin")'),
},
},
async ({ amount, from, to }): Promise<CallToolResult> => {
try {
const fromResolved = resolveCurrency(from);
const toResolved = resolveCurrency(to);
if (fromResolved.code === toResolved.code) {
return {
content: [{
type: 'text',
text: JSON.stringify({
amount,
from: fromResolved.code,
to: toResolved.code,
result: amount,
rate: 1,
inverseRate: 1,
timestamp: new Date().toISOString(),
source: 'identity',
cached: false,
}, null, 2),
}],
};
}
const result = await convertCurrency(amount, fromResolved.code, toResolved.code);
const chargeResult = await Actor.charge({ eventName: 'currency-convert' });
log.info('PPE charge', {
event: 'currency-convert',
chargedCount: chargeResult.chargedCount,
limitReached: chargeResult.eventChargeLimitReached,
});
log.info(`Converted ${amount} ${fromResolved.code} → ${toResolved.code}: ${result.result}`);
return {
content: [{ type: 'text', text: JSON.stringify(result, null, 2) }],
};
} catch (error) {
log.error('Error in convert_currency:', { error: (error as Error).message });
return {
content: [{ type: 'text', text: `Error: ${(error as Error).message}` }],
isError: true,
};
}
},
);
}
