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cactus-needle

Local tool calling, structured extraction, embeddings, and speech transcription for JavaScript and TypeScript, powered by Needle and Whistle.

Both models run in Node.js and browsers, on the CPU in WebAssembly workers. Use the standalone API or the optional Vercel AI SDK provider. Inference needs no API key, server, or GPU.

Install

npm install cactus-needle

Environments

Choose imports for your environment. Text and speech are available in both.

Environment	Standalone	AI SDK provider
Node.js 22.18+	cactus-needle	cactus-needle/ai-sdk
Browser	cactus-needle/browser	cactus-needle/ai-sdk/browser

Browsers require HTTPS or localhost, WebAssembly, and module workers. Vite handles the packaged worker and WASM assets; see browser setup for other bundlers.

Capabilities

Capability	Model	Standalone methods
Tool calling	Needle	complete(), generate(), run()
Structured extraction	Needle	extract()
Text embeddings	Needle	embed()
Speech transcription	Whistle	transcribe()
Live transcription	Whistle	stream()
Audio encoder features	Whistle	embed()

The standalone examples below use Node.js imports. For browsers, import the same names from cactus-needle/browser; the methods are the same.

Tool calling

Define the actions your application supports. Needle selects tools and fills their arguments from the user's request. It is intended for tools and structured data, not general chat.

import { Needle, tool } from 'cactus-needle';

const needle = new Needle({
  tools: {
    set_lights: tool({
      description: 'Turn the lights in a room on or off.',
      inputSchema: {
        type: 'object',
        properties: { room: { type: 'string' }, on: { type: 'boolean' } },
        required: ['room', 'on'],
      },
    }),
  },
});

try {
  const result = await needle.complete('Turn on the kitchen lights');
  console.log(result.function_calls);
  // [{ name: 'set_lights', arguments: { room: 'kitchen', on: true } }]
} finally {
  await needle.close();
}

complete() and generate() return predictions. To execute them and feed results back to the model, add an execute callback to each tool and call needle.run(text).

Speech to text

import * as needle from 'cactus-needle';

try {
  console.log((await needle.transcribe('clip.wav')).text);
} finally {
  await needle.close();
}

Like Python's needle.transcribe(), this helper loads and reuses Whistle. It accepts uncompressed WAV or PCM samples, up to 30 seconds per call. In Node.js, a string names a local file; in a browser, it names an audio URL. Browsers also accept a File from a file input. Decode MP3, WebM, and other compressed formats to PCM first.

Use new Whistle() to manage your own speech session. See the speech guide for live transcription, supported languages, word timestamps, and audio features.

Model loading

Standalone constructors and shared helpers load on first use. Needle's default weights are 35.3 MB; Whistle's are 16.9 MB. Only the model you use is loaded. Missing default weights download from Hugging Face and are cached on disk in Node.js, or in browser storage when available.

Keep an instance while your application needs it, then call close(). Changing tools on that instance keeps the model loaded. Top-level transcribe(), stream(), and extract() share default models; top-level close() releases them.

For custom weights, offline use, and the eager createNeedle() / createWhistle() factories, see Node.js loading or browser loading.

Vercel AI SDK

An optional integration for the same local models. Supports AI SDK 6 and 7. Standalone users do not need ai.

Install the SDK and, for this example, Zod:

npm install ai zod

In Node.js, provision weights before using the provider:

import { generateText } from 'ai';
import { downloadModel } from 'cactus-needle';
import { createNeedle } from 'cactus-needle/ai-sdk';
import { z } from 'zod';

const modelPath = await downloadModel();
const needle = createNeedle({ modelPath });

const { toolCalls } = await generateText({
  model: needle('needle3'),
  tools: {
    set_lights: {
      description: 'Turn the lights in a room on or off.',
      inputSchema: z.object({ room: z.string(), on: z.boolean() }),
    },
  },
  prompt: 'Turn on the kitchen lights',
});

console.log(toolCalls);

In browsers, import createNeedle from cactus-needle/ai-sdk/browser and use createNeedle(); default weights download and cache on first use. The provider creates and closes a worker for each SDK request.

The adapter supports tool calling, structured output, text embeddings, and batch transcription through needle.transcriptionModel('whistle'). It accepts one user turn plus optional system messages; text streaming is buffered. Use the standalone API for tool loops and live audio. See the AI SDK guide for examples.

Documentation

• Standalone API
• AI SDK guide
• Development

License

Apache-2.0. An independent wrapper for Cactus Compute's Needle and Whistle. See LICENSE, NOTICE, and the upstream license.