Build, test and run custom AI agents visually — no glue code required.
NEB is a visual AI agent builder. Instead of wiring agents together with code, you compose them on an interactive node canvas: drag in building blocks, connect them into workflows, attach real APIs, pick from a library of skills, prompts and templates, and then test everything in a live, real-time execution playground.
- Visual node canvas — drag, connect and configure agent workflow nodes on an interactive flow canvas.
- Live execution playground — run agents in real time and watch output stream back as it happens.
- API integrations — hook up third-party APIs with preset connectors or define your own endpoints.
- Skill library — a large set of built-in skills plus agent templates to kick-start any project.
- Prompt library — store, organize and reuse prompts across agents.
- Template library — start from pre-built agent workflows instead of a blank canvas.
- Node configuration panel — fine-tune every node's inputs, outputs and behavior in one place.
- Table & prompt editors — full-featured inline editors for structured data and prompts.
- Embed & export — embed your agents and export/share artifacts, including Office docs via inline viewer.
- Custom Gemini agents — powered by the Gemini API with multi-provider AI support.
Prerequisites: Node.js 18+ and a Gemini API key.
# 1. Install dependencies
npm install
# 2. Create your environment file and add your API key
cp .env.example .env.local # then set GEMINI_API_KEY# 3. Start the dev server
npm run devOpen the printed local URL (default http://localhost:3000) to start building.
| Command | Description |
|---|---|
npm run dev | Start the dev server (hot reload) |
npm run build | Build client + server production bundles |
npm run start | Run the built server |
npm run preview | Preview the built client |
npm run lint | Type-check the project with TypeScript |
| Layer | Technologies |
|---|---|
| Frontend | React 19, TypeScript, Vite, Tailwind CSS 4, Motion (Framer Motion) |
| Backend | Node.js, Express, tsx |
| AI | AI SDK, @ai-sdk/google, @ai-sdk/openai, @google/genai |
| Extras | Composio (tool integrations), xlsx (spreadsheet handling) |
| Variable | Required | Description |
|---|---|---|
GEMINI_API_KEY | Yes | Your Gemini API key |
neb/
├── src/ # Client source code
│ ├── components/ # UI: canvas, playground, config panels, editors
│ ├── data/ # Agents, skills, prompts, templates, providers
│ └── lib/ # Shared utilities
├── data/ # Runtime data (agents.json)
├── assets/ # Brand assets (logo, previews)
├── server.ts # Express server entry point
├── vite.config.ts # Vite configuration
├── tsconfig.json # TypeScript configuration
└── package.json
- Fork the repository.
- Create a feature branch:
git checkout -b feat/my-feature - Commit your changes:
git commit -m "feat: add my feature" - Push to the branch:
git push origin feat/my-feature - Open a pull request.