claw-mcp-toolkit

Instructions

Implementation Reference

• src/modules/crypto.ts:42-54 (handler)

  The `crypto_price_history` tool is implemented here, defining the input schema (coin, days) and executing the handler by fetching market data from CoinGecko and formatting the result.

  server.tool("crypto_price_history", "Get price history for a coin over a number of days", {
    coin: z.string().describe("Coin ID (e.g. bitcoin)"),
    days: z.number().default(7).describe("Number of days (1, 7, 30, 90, 365)")
  }, async ({ coin, days }) => {
    const data = await safeFetch(`https://api.coingecko.com/api/v3/coins/${coin}/market_chart?vs_currency=usd&days=${days}`);
    const prices = data.prices;
    const first = prices[0][1];
    const last = prices[prices.length - 1][1];
    const change = ((last - first) / first) * 100;
    const high = Math.max(...prices.map((p: any) => p[1]));
    const low = Math.min(...prices.map((p: any) => p[1]));
    return { content: [{ type: "text", text: `**${coin.toUpperCase()} — ${days}d History**\nStart: ${formatCurrency(first)}\nEnd: ${formatCurrency(last)}\nChange: ${formatPercent(change)}\nHigh: ${formatCurrency(high)}\nLow: ${formatCurrency(low)}\nData Points: ${prices.length}` }] };
  });