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Behavior Trees

Official registry Other

Validate, convert (behavior3 JSON, BehaviorTree.CPP XML) and open behavior trees in a visual editor

Source code Website Documentation

What can you do with Behavior Trees?

  • Custom nodes: create your own node types in any of the four basic categories — composite, decorator, action, or condition
  • Node properties: edit titles, descriptions, and custom properties per node instance
  • Manual and auto layout: drag nodes around, or press a to auto-organize the whole tree
  • Multiple trees per project: create and manage as many trees as you need
  • JSON import/export: an open format that works with any behavior3-compatible runtime
  • No lock-in: runs in the browser, no accounts, no external tools or engines required

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http behavior-trees 'https://www.behaviortrees.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "behavior-trees": {
            "type": "http",
            "url": "https://www.behaviortrees.com/mcp"
        }
    }
}
NPM package behaviortrees
Claude Code 
claude mcp add behavior-trees -- npx -y behaviortrees@0.1.1 mcp
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "behavior-trees": {
            "command": "npx",
            "args": [
                "-y",
                "behaviortrees@0.1.1",
                "mcp"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Behavior Trees Editor
  2. What's in this repo
  3. Features
  4. Development
  5. Deployment
  6. License

Behavior Trees Editor

A free, open-source visual editor for behavior trees, live at behaviortrees.com. Model AI for games, robotics, and simulations, then export to an open JSON format you can load with any behavior3-compatible library.

Originally based on behavior3editor by Renato de Pontes Pereira, since rebuilt as a modern React editor on the Nocturne design system and extended with a guides site. The original AngularJS editor lives on at old.behaviortrees.com.

What's in this repo

A pnpm + Turborepo monorepo:

PathWhat it isWhere it deploys
apps/editor/Main editor (React + TypeScript + React Flow)behaviortrees.com
apps/editor-classic/Classic editor (AngularJS + gulp)old.behaviortrees.com
apps/site/Guides and articles (Astro)behaviortrees.com/learn
packages/examples/Shared example trees consumed by both editorsbundled into both editors

apps/editor-classic is intentionally not a workspace member — its gulp 3 toolchain keeps its own npm lockfile. Never run pnpm inside it.

Features

  • Custom nodes: create your own node types in any of the four basic categories — composite, decorator, action, or condition
  • Node properties: edit titles, descriptions, and custom properties per node instance
  • Manual and auto layout: drag nodes around, or press a to auto-organize the whole tree
  • Multiple trees per project: create and manage as many trees as you need
  • JSON import/export: an open format that works with any behavior3-compatible runtime
  • No lock-in: runs in the browser, no accounts, no external tools or engines required

Development

git clone https://github.com/behaviortrees/behaviortrees.git
cd behaviortrees
pnpm install

pnpm dev --filter @behaviortrees/editor   # React editor (Vite)
pnpm dev --filter @behaviortrees/site     # guides site (Astro)
pnpm build                                # build editor + site via Turborepo
pnpm test                                 # editor test suite
Classic editor

Uses Node <= 22 (see .nvmrc) and its own npm toolchain:

pnpm build:classic          # npm install + bower install + gulp build, from the repo root
# or, inside apps/editor-classic:
npm install --ignore-scripts
npx bower install
gulp serve                  # live reload at http://127.0.0.1:8000

Deployment

The React editor deploys to behaviortrees.com through apps/editor/vercel.json (Vercel root directory: apps/editor); its build also bundles the guides site so /learn is served from the same deploy. build-deploy.sh builds the classic editor and the guides site, merging both into deploy/ as the static site Netlify serves at old.behaviortrees.com (via netlify.toml).

License

  • The classic editor and repo root are MIT — see LICENSE, © 2014 Renato de Pontes Pereira.
  • The React editor (apps/editor/) is AGPL-3.0 © Alan Hoskins, with portions derived from the MIT original — see apps/editor/LICENSE and apps/editor/LICENSE-MIT.

Credit to the original behavior3 team for the editor this project grew from.

Frequently asked questions

What is Behavior Trees?

Validate, convert (behavior3 JSON, BehaviorTree.CPP XML) and open behavior trees in a visual editor

How do I install Behavior Trees?

It runs as a remote server. In Claude Code: claude mcp add --transport http behavior-trees 'https://www.behaviortrees.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Behavior Trees need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Behavior Trees open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Behavior Trees?

It is published by behaviortrees. AI.tn lists it but does not maintain or endorse it.

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