init

2-tc-function.mjs

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+import OpenAI from 'openai'
+const openai = new OpenAI({
+  apiKey:
+    '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'
+}) // or set environment: export OPENAI_API_KEY=...
+
+const my = {
+  model: 'gpt-5-nano'
+}
+
+const tools = [
+  {
+    type: 'function',
+    name: 'get_horoscope',
+    description: "Get today's horoscope for an astrological sign.",
+    parameters: {
+      type: 'object',
+      properties: {
+        sign: {
+          type: 'string',
+          description: 'An astrological sign like Taurus or Aquarius'
+        }
+      },
+      required: ['sign']
+    }
+  }
+]
+
+const api = {
+  get_horoscope ({ sign } = {}) {
+    return sign + ' Next Tuesday you will befriend a baby otter.'
+  }
+}
+
+// Create a running input list we will add to over time
+let input = [
+  { role: 'user', content: 'What is my horoscope? I am an Aquarius.' }
+]
+
+// 2. Prompt the model with tools defined
+let response = await openai.responses.create({
+  model: my.model,
+  tools,
+  input
+})
+
+console.log('==========Response 1. round')
+console.log(JSON.stringify(response, null, 2)) // response.output_text/output_parsed
+
+input.push(...response.output) // add the model's response to the input, including any function calls, otherwise the next request reports: 'BadRequestError: 400 No tool call found for function call output with call_id ...'
+
+response.output.forEach(item => {
+  if (item.type == 'function_call') {
+    if (typeof api[item.name] === 'function') {
+      console.log('function call =', item)
+
+      const function_call_output = api[item.name](JSON.parse(item.arguments))
+      console.log('function call output =', function_call_output)
+
+      // 4. Provide function call results to the model
+      input.push({
+        type: 'function_call_output',
+        call_id: item.call_id,
+        output: function_call_output.toString()
+      })
+    }
+  }
+})
+
+console.log('=========Input appended with function call output')
+console.log(JSON.stringify(input, null, 2))
+
+response = await openai.responses.create({
+  model: my.model,
+  //instructions: 'Respond only with a horoscope generated by a tool.',
+  tools,
+  input
+})
+
+// 5. The model should be able to give a response!
+console.log('============Final output:')
+console.log(JSON.stringify(response.output, null, 2))