npm package: @jarvis-agent/core
Description: A production-ready JavaScript AI Agent framework for creating reliable agents across browser and Node.js environments.
Author: FellouAI
Latest version: 0.3.1




<h1 align="center">
  <a href="https://github.com/FellouAI/eko" target="_blank">
    <img src="https://github.com/user-attachments/assets/55dbdd6c-2b08-4e5f-a841-8fea7c2a0b92" alt="eko-logo" width="200" height="200">
  </a>
  <br>
  <small>Eko - Build Production-ready Agentic Workflow with Natural Language</small>
</h1>



[![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE) [![Build Status](https://img.shields.io/badge/build-passing-brightgreen.svg)](https://example.com/build-status) [![Version](https://img.shields.io/github/package-json/v/FellouAI/eko?color=yellow)](https://eko.fellou.ai/docs/release/versions/)

Eko (pronounced like 'echo') is a production-ready JavaScript framework that enables developers to create reliable agents, **from simple commands to complex workflows**. It provides a unified interface for running agents in both **computer and browser environments**.

## News

- **2025-11:** Eko 4.0 supports chat conversations & optimizes agent logic.
- **2025-09:** Eko 3.0 introduces dependency-aware parallel agent execution.
- **2025-09:** New pause, resume, and interrupt controls with `task_snapshot` workflow recovery.
- **2025-09:** Monorepo tooling migrated to pnpm for consistent workspace management.

## Upgrading to Eko 4.0

Follow these steps when moving an existing Eko 3.x project to 4.0:

1. Update dependencies with `pnpm up @jarvis-agent/core @jarvis-agent/nodejs @jarvis-agent/web @jarvis-agent/extension`.
2. Regenerate saved workflows or exported plans so they use the v3 schema and dependency graph format.
3. Clean and reinstall using pnpm (`rm -rf node_modules && pnpm install`), then rebuild any browser or desktop bundles.
4. Re-run automated demos and update documentation to reflect the new pause/interrupt APIs and parallel agent behavior.


## Framework Comparison

| Feature                              | Eko   | Langchain  | Browser-use  | Dify.ai  | Coze   |
|--------------------------------------|-------|------------|--------------|----------|--------|
| **Supported Platform**               | **All platform**  | Server side  | Browser  | Web  | Web  |
| **One sentence to multi-step workflow** | ✅    | ❌          | ✅            | ❌        | ❌      |
| **Intervenability**                  | ✅    | ✅          | ❌            | ❌        | ❌      |
| **Task Parallel** | ✅    | ❌          | ❌            | ❌        | ❌      |
| **Development Efficiency**           | **High**  | Low      | Middle        | Middle    | Low    |
| **Task Complexity**           | **High**  | High      | Low        | Middle    | Middle    | Middle       |
| **Open-source**                      | ✅    | ✅          | ✅            | ✅        | ❌      |
| **Access to private web resources** | ✅ | ❌          | ❌            | ❌        | ❌      |

## Features

- [x] Pure JavaScript: Built for browsers and Node.js.🚀
- [x] Multi-Agent: Unleash power with multiple Agents in one task.📈
- [x] Agent/Tool Flexibility: Customize new Agents and Tools in just one line.🎉
- [x] Native MCP: Connects seamlessly with [Awesome MCP Servers](https://mcpservers.org/).🔗
- [x] Dynamic LLM: Balance speed and performance with flexible model choices.⚙️
- [x] Human-in-the-loop: Intervene when it matters most.🤝
- [x] Stream Planning: Dynamic rendering made easy.🎨
- [x] Loop & Listener Tasks: Automate any repetitive task.🤖
- [ ] Observable Chain: *Coming soon*
- [ ] Native A2A: *Coming soon*

## Quickstart

> **Note**: Please refer to the [Eko Quickstart guide](https://eko.fellou.ai/docs/getting-started/quickstart/) guide for full instructions on how to run it.

> **Security Warning**
> 
> DO NOT use API Keys in browser/frontend code!
>
> This will expose your credentials and may lead to unauthorized usage.
>
> Best Practices: Configure backend API proxy request through baseURL and request headers.
>
> Please refer to the link: https://eko.fellou.ai/docs/getting-started/configuration#web-environment

```typescript
const llms: LLMs = {
  default: {
    provider: "anthropic",
    model: "claude-sonnet-4-5-20250929",
    apiKey: "your-api-key"
  },
  gemini: {
    provider: "google",
    model: "gemini-2.5-pro",
    apiKey: "your-api-key"
  },
  openai: {
    provider: "openai",
    model: "gpt-5",
    apiKey: "your-api-key"
  },
  // OpenAI-compatible models (Qwen, Doubao, etc.)
  qwen: {
    provider: "openai",
    model: "qwen-plus",
    apiKey: "your-qwen-api-key",
    config: {
      baseURL: "https://dashscope-intl.aliyuncs.com/compatible-mode/v1"
    }
  },
  doubao: {
    provider: "openai",  // Use OpenAI provider for compatibility
    model: "doubao-seed-1-6-250615",  // or other Doubao model
    apiKey: "your-volcengine-api-key",
    config: {
      baseURL: "https://ark.cn-beijing.volces.com/api/v3"  // Volcengine endpoint
    }
  }

};

let agents: Agent[] = [new BrowserAgent(), new FileAgent()];
let eko = new Eko({ llms, agents });
let result = await eko.run("Search for the latest news about Musk, summarize and save to the desktop as Musk.md");
```

```bash
$ pnpm install @jarvis-agent/core
```

## Example Projects

The repository ships with three workspace examples under the `example/` folder.

### Prerequisites

Before running any example, install dependencies and build the core packages from the root directory:

```bash
pnpm install
pnpm build
```

### Browser Extension (`example/extension`)

```bash
cd example/extension
pnpm install
pnpm run build
```

Load the generated `dist` directory via `chrome://extensions` → Developer Mode → Load unpacked.
Configure your API key in the extension options before running the automation task.

### Node.js Automation (`example/nodejs`)

```bash
cd example/nodejs
pnpm install
pnpm playwright install   # first time only, installs browsers
pnpm run build
OPENAI_API_KEY=... ANTHROPIC_API_KEY=... pnpm run start
```

The Node.js demo drives Playwright through Eko; provide at least one model API key before running it.

### Web Login Demo (`example/web`)

```bash
cd example/web
pnpm install
pnpm run start
```

This starts a React dev server on the default port with a simple login flow that you can automate
with the browser or web agents.

## Use Cases

- Browser automation and web scraping
- System file and process management
- Workflow automation
- Data processing and organization
- GUI automation
- Multi-step task orchestration

## Documentation

Visit our [documentation site](https://eko.fellou.ai/docs) for:

- Getting started guide
- API reference
- Usage examples
- Best practices
- Configuration options

## Development Environments

Eko can be used in multiple environments:

- Browser Extension
- Web Applications
- Node.js Applications

## Community and Support

- Report issues on [GitHub Issues](https://github.com/FellouAI/eko/issues)

[![Star History Chart](https://api.star-history.com/svg?repos=FellouAI/eko&type=Date)](https://star-history.com/#FellouAI/eko&Date)


## License

Eko is released under the MIT License. See the [LICENSE](LICENSE) file for details.