How do I use tool calling in JavaScript?

When the reply has tool_calls, run each tool and send the result back with its tool_call_id, then ask again.

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.gateway.clatterlabs.xyz/v1",
  apiKey: process.env.CLATTER_API_KEY,
  defaultHeaders: { "X-Clatter-Account": process.env.CLATTER_ACCOUNT_ID },
});

const tools = [{
  type: "function",
  function: {
    name: "get_weather",
    description: "Get the current weather for a city.",
    parameters: { type: "object", properties: { city: { type: "string" } }, required: ["city"] },
  },
}];
const getWeather = ({ city }) => ({ temp_c: 18, sky: "light rain" });

const msgs = [{ role: "user", content: "What's the weather in Paris?" }];
let r = await client.chat.completions.create({ model: "supercosmos-max", messages: msgs, tools });
let msg = r.choices[0].message;
while (msg.tool_calls?.length) {
  msgs.push(msg);
  for (const call of msg.tool_calls) {
    const out = getWeather(JSON.parse(call.function.arguments));
    msgs.push({ role: "tool", tool_call_id: call.id, content: JSON.stringify(out) });
  }
  r = await client.chat.completions.create({ model: "supercosmos-max", messages: msgs, tools });
  msg = r.choices[0].message;
}
console.log(msg.content);

Up to 64 tools per request. tool_choice can be auto, none, required or a specific function.

Every JavaScript example uses the same client (base URL, key and the X-Clatter-Account header); see Set up the JavaScript SDK. Full parameter list: Create a chat completion.

Still need help?#

• General support: support@clatterlabs.com or team@clatterlabs.xyz
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