drawDB + MCP Server

This fork of DrawDB extends the original with AI assistant integration via Model Context Protocol (MCP). AI assistants like Claude can create, modify, and manage database diagrams programmatically.

The backend owns the diagram. MCP tools read and write the authoritative state directly, so every tool works whether or not a browser is open — you do not need the editor running for an assistant to build a schema. When a GUI is connected it acts as a synced view: the backend pushes each committed change to it, and edits made in the editor are submitted back. A tab that reconnects adopts whatever the backend holds.

Relationship to Upstream DrawDB

This project began as a fork of DrawDB but has since diverged substantially and is intentionally not kept in sync with upstream. Selected fixes and features are occasionally cherry-picked from the parent project, but the two will continue to drift apart as drawdb-mcp evolves on its own. DrawDB remains a separate, actively maintained project, and full credit goes to its authors — see drawdb-io/drawdb.

Demo Video

Watch how to design database schemas using natural language with Claude AI.

Architecture:

• apps/gui: React frontend derived from DrawDB — a synced view of the backend's diagram, not the store
• apps/backend: NestJS MCP server that holds the authoritative diagram state
• packages/diagram-core: framework-free domain layer — entity schemas, the state reducer, the datatype tables and the SQL/DBML codecs, so the backend can render exports with no GUI running
• packages/remote-control-contract: the typed ORPC contract both directions of the socket share
• Built with Turborepo and pnpm workspaces

Getting Started

Quick Start with Docker (Recommended)

The easiest way to get started is using Docker:

docker run \
  --name drawdb-mcp \
  -p 8080:80 \
  -p 3000:3000 \
  --restart unless-stopped \
  ghcr.io/anatoly-lab/drawdb-mcp:latest

Then:

1. Open GUI: http://localhost:8080
2. Connect Claude Code to the MCP server:

claude mcp add --transport http drawdb-mcp http://127.0.0.1:3000

Now Claude can create and modify database diagrams for you!

Prereleases

latest tracks stable releases only. Betas and release candidates are published under their exact version and never move latest, so pin the full version to run one:

docker run \
  --name drawdb-mcp \
  -p 8080:80 \
  -p 3000:3000 \
  ghcr.io/anatoly-lab/drawdb-mcp:2.0.0-beta.1

See GHCR_DEPLOYMENT.md for available tags and advanced usage.

Local Development

Prerequisites

• Node.js 20.19+ or 22.22+ (see engines in package.json)
• pnpm 8.15.0+ (install via npm install -g pnpm)

Start both GUI and backend:

git clone https://github.com/anatoly-lab/drawdb-mcp
cd drawdb-mcp
pnpm install
pnpm dev

Start GUI only:

pnpm gui:dev
# Access at http://localhost:5173

Start backend only:

pnpm backend:dev
# WebSocket at ws://localhost:3000/remote-control

Build

Build both applications:

pnpm install
pnpm build

Build specific app:

pnpm build --filter=gui
pnpm build --filter=backend

Connect Claude Code to MCP Server

When running locally, connect Claude Code:

claude mcp add --transport http drawdb-mcp http://127.0.0.1:3000

The frontend connects to the backend over WebSocket automatically. Remember it is a view of the backend's state rather than the store: the tools keep working with no browser open, and a tab that reconnects adopts whatever the backend holds.

Docker Deployment

See DOCKER_BUILD.md for detailed build instructions.

Build with Docker Compose:

docker-compose up --build
# Access at http://localhost:8080

Or build directly:

docker build -t drawdb-mcp:local .
docker run -p 8080:80 -p 3000:3000 drawdb-mcp:local

The Docker image includes both frontend and backend. WebSocket is proxied through Nginx.

Updating to New Versions

When updating to a new version (whether via Docker or local development), you must perform a hard refresh in your browser to clear the cached frontend JavaScript:

• Windows/Linux: Ctrl + Shift + R or Ctrl + F5
• macOS: Cmd + Shift + R

Without a hard refresh, the browser may continue using the old cached frontend code even though the backend has been updated, which can cause errors or unexpected behavior.

Features

Export & Import

The MCP server provides tools for exporting and importing database diagrams in multiple formats:

Export Formats:

• SQL DDL: Export database-specific SQL statements (PostgreSQL, MySQL, SQLite, MariaDB, MSSQL, Oracle)
• DBML: Export to Database Markup Language (human-readable, database-agnostic format)
• JSON: Export complete diagram state for backup/restore

Import Formats:

• DBML: Import database schemas from DBML format
• JSON: Import complete diagram state

Available MCP Tools:

• export_sql - Export diagram as SQL DDL for current database type
• export_dbml - Export diagram as DBML
• import_dbml - Import database schema from DBML
• export_diagram - Export complete diagram as JSON
• import_diagram - Import complete diagram from JSON

See CLAUDE.md for complete list of available MCP tools and their usage.

License & Credits

This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0), inherited and retained from upstream DrawDB. See the LICENSE file for the full text.

Built on top of DrawDB by the DrawDB authors and contributors. Huge thanks to the original project for the foundation this fork is built on.