Bonnard MCP Server

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Self-hosted semantic layer for AI agents.

Docs · CLI · Discord · Website

Bonnard is an agent-native semantic layer — one set of metric definitions, every consumer (AI agents, apps, dashboards) gets the same governed answer. This repo is the self-hosted Docker deployment: run Bonnard on your own infrastructure with no cloud account needed.

Quick Start

# 1. Scaffold project
npx @bonnard/cli init --self-hosted

# 2. Configure your data source
#    Edit .env with your database credentials

# 3. Start the server
docker compose up -d

# 4. Define your semantic layer
#    Add cube/view YAML files to bonnard/cubes/ and bonnard/views/

# 5. Deploy models to the server
bon deploy

# 6. Verify your semantic layer
bon schema

# 7. Connect AI agents
bon mcp

Requires Node.js 20+ and Docker.

What's Included

• MCP server — AI agents query your semantic layer over the Model Context Protocol
• Cube semantic layer — SQL-based metric definitions with caching, access control, and multi-database support
• Cube Store — pre-aggregation cache for fast analytical queries
• Admin UI — browse deployed models, views, and measures at http://localhost:3000
• Deploy API — push model updates via bon deploy without restarting containers
• Health endpoint — GET /health for uptime monitoring

Connecting AI Agents

Run bon mcp to see connection config for your setup. Examples below.

Claude Desktop / Cursor

{
  "mcpServers": {
    "bonnard": {
      "url": "https://bonnard.example.com/mcp",
      "headers": {
        "Authorization": "Bearer your-secret-token-here"
      }
    }
  }
}

Claude Code

{
  "mcpServers": {
    "bonnard": {
      "type": "url",
      "url": "https://bonnard.example.com/mcp",
      "headers": {
        "Authorization": "Bearer your-secret-token-here"
      }
    }
  }
}

CrewAI (Python)

from crewai import MCPServerAdapter

mcp = MCPServerAdapter(
    url="https://bonnard.example.com/mcp",
    transport="streamable-http",
    headers={"Authorization": "Bearer your-secret-token-here"}
)

Production Deployment

Authentication

Protect your endpoints by setting ADMIN_TOKEN in .env:

ADMIN_TOKEN=your-secret-token-here

All API and MCP endpoints will require Authorization: Bearer <token>. The /health endpoint remains open for monitoring.

Restart after changing .env:

docker compose up -d

TLS with Caddy

Caddy provides automatic HTTPS via Let's Encrypt.

Create a Caddyfile next to your docker-compose.yml:

bonnard.example.com {
    reverse_proxy localhost:3000
}

Add Caddy to your docker-compose.yml:

  caddy:
    image: caddy:2
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./Caddyfile:/etc/caddy/Caddyfile:ro
      - caddy_data:/data
    restart: unless-stopped

Add the volume at the top level:

volumes:
  models: {}
  caddy_data: {}

Then remove the Bonnard port mapping (ports: - "3000:3000") since Caddy handles external traffic.

Deploy to a VM

# Copy project files to your server
scp -r . user@your-server:~/bonnard/

# SSH in and start
ssh user@your-server
cd ~/bonnard
docker compose up -d

Configuration