Motion

AI-native collaborative document editor
Humans and AI agents co-edit documents in real time through the same CRDT protocol.

Why Motion?

AI agents are first-class editors. They connect via MCP or REST API, appear in the presence bar with live cursors, and their keystrokes show up in real time — just like another human collaborator.

Suggestion mode keeps humans in control. Agent edits are proposed, not committed. Review additions (green underline) and deletions (strikethrough), then accept or reject — individually or in bulk.

CRDT-first. Every document is a Yjs CRDT, synced via PartyKit WebSocket rooms. True conflict-free editing for any number of humans and agents, with zero coordination overhead. Local persistence via IndexedDB means documents load instantly.

One schema, everywhere. The ProseMirror schema in packages/editor-extensions is the single source of truth — used identically by the browser editor, the MCP server, and the sync server.

Features

Rich Editor

Headings, paragraphs, bullet / ordered / task lists, blockquotes, code blocks (syntax-highlighted), tables (resizable), callouts (info / warning / error / success), toggles, images, horizontal rules. Bold, italic, underline, strikethrough, inline code, links, highlights, text color.

AI Agent Integration

31 REST API endpoints for document editing, page management, comments, version history, suggestions, and export. Any LLM can integrate — not locked to MCP. Agents authenticate with workspace tokens or invite links.

Real-Time Collaboration

Live cursors and selection awareness for every participant. Yjs CRDT sync with zero perceptible latency. Agents appear with distinct purple cursors and thinking / writing / idle status.

Comments & Discussions

Highlight text to start a thread. Threaded replies with @mentions. Resolve and reopen discussions. Full comment API for agents.

Version History

Auto-snapshots every 30 minutes and on session end. Manual save with custom labels. Restore any version with one click.

Workspace Management

Page tree with nested hierarchy. Folders. Drag-and-drop reordering. Favorites. Soft-delete with trash recovery. Invite links and email invitations. Role-based access (owner / admin / member / guest).

Export

Markdown and HTML export from the editor or via API.

Slash Commands

Type / for a Notion-style command menu — insert any block type with type-ahead search.

Architecture

  Browser (TipTap + Yjs)             AI Agent (MCP / REST)
        │                                   │
        └───── WebSocket ─────┬───── HTTP ──┘
                              │
                       PartyKit Server
                        (Yjs rooms)
                              │
                       Supabase Postgres
                    (metadata, auth, comments,
                     versions, permissions)

Documents live entirely in Yjs — Supabase stores workspace metadata, not document content.

Monorepo Structure

apps/
  web/                 React 19 + Vite frontend (Cloudflare Pages)
  mcp-server/          MCP + HTTP API server for AI agents (Fly.io)
packages/
  shared/              Types, constants, branding config, agent guide
  editor-extensions/   TipTap extensions + ProseMirror ↔ Yjs bridge
party/                 PartyKit server for real-time Yjs sync
supabase/
  migrations/          PostgreSQL schema (14 migrations)
skills/
  motion-agent/        Claude Code skill for agent integration

Quick Start

Prerequisites

• Node.js >= 20
• pnpm 10+
• Supabase project (auth, metadata, comments, versions)
• PartyKit account (real-time sync)

1. Clone and install

git clone https://github.com/AudiTT/motion.git
cd motion
pnpm install

2. Configure environment

Copy .env.example to .env and fill in your values:

# Supabase
VITE_SUPABASE_URL=https://your-project.supabase.co
VITE_SUPABASE_ANON_KEY=your-anon-key
SUPABASE_SERVICE_ROLE_KEY=your-service-role-key

# PartyKit
VITE_PARTYKIT_HOST=localhost:1999

Create party/.dev.vars for the PartyKit server:

SUPABASE_URL=https://your-project.supabase.co
SUPABASE_SERVICE_ROLE_KEY=your-service-role-key

3. Set up the database

supabase db push

Or apply migrations 001–014 manually via the Supabase SQL editor.

4. Start development

pnpm dev          # Web app + PartyKit + MCP server

Or run individually:

pnpm dev:web      # http://localhost:5173
pnpm dev:party    # ws://localhost:1999
pnpm dev:mcp      # MCP server (stdio mode)

5. Build

pnpm build        # shared → editor-extensions → apps
pnpm typecheck    # Type-check all packages

AI Agent Integration

HTTP API (any LLM)

Create a session with a workspace agent token:

curl -X POST https://your-mcp-server.fly.dev/sessions \
  -H "Content-Type: application/json" \
  -d '{"agent_token": "your-token", "agent_name": "Claude"}'

The response includes a session_id. Use it in all subsequent calls:

# Read the document
curl https://your-mcp-server.fly.dev/sessions/$SESSION_ID/document

# Insert a block
curl -X POST https://your-mcp-server.fly.dev/sessions/$SESSION_ID/blocks \
  -H "Content-Type: application/json" \
  -d '{"index": -1, "block": {"type": "paragraph", "content": [{"type": "text", "text": "Hello from an agent!"}]}}'

# Disconnect
curl -X DELETE https://your-mcp-server.fly.dev/sessions/$SESSION_ID

See skills/motion-agent/references/api-reference.md for all 31 endpoints.

MCP Protocol (Claude Desktop, Cursor)

DOCUMENT_ID=<page-id> \
WORKSPACE_ID=<workspace-id> \
PARTYKIT_HOST=your-partykit-host \
SUPABASE_URL=https://your-project.supabase.co \
SUPABASE_SERVICE_ROLE_KEY=your-key \
AGENT_NAME=Claude \
pnpm dev:mcp

Claude Code Skill

A ready-made skill is included at skills/motion-agent/. Copy it to your Claude Code project:

cp -r skills/motion-agent/ .claude/skills/motion-agent/

Suggestion Workflow

By default, agent edits are wrapped in suggestion marks:

1. Agent inserts or modifies content → appears as green underlines (additions) or strikethroughs (deletions)
2. Human reviews in the editor → accepts or rejects each suggestion
3. Agents can also use "mode": "direct" to bypass suggestions for trusted operations

Deployment

MCP Server (Fly.io)

fly apps create your-mcp-server
fly secrets set \
  PARTYKIT_HOST="your-partykit-host" \
  SUPABASE_URL="https://your-project.supabase.co" \
  SUPABASE_SERVICE_ROLE_KEY="your-key"
fly deploy

Verify: curl https://your-mcp-server.fly.dev/health

Rebranding

Motion is designed to be forked and rebranded. The app name is centralized in a single config file:

packages/shared/src/config.ts

export const APP_NAME = "Motion";        // Display name in UI
export const APP_DESCRIPTION = "...";    // Tagline
export const APP_SLUG = "motion";        // CLI and MCP server name
export const DEFAULT_MCP_HOST = "...";   // Default API endpoint

After changing the config, also update:

Then rebuild: pnpm build

Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-thing)
3. Make your changes
4. Run pnpm build && pnpm typecheck to verify
5. Open a pull request

License

MIT — Viet Anh Trinh