Cosmic MCP server

Cosmic MCP Server

An MCP (Model Context Protocol) server that exposes Cosmic CMS functionality as tools for AI assistants. Manage your content, media, object types, and generate AI content directly through Claude, Cursor, or any MCP-compatible client.

Features

• Content Management: Create, read, update, and delete objects in your Cosmic bucket
• Media Management: Upload, list, and manage media files
• Schema Management: Create and modify object types with custom metafields
• AI Generation: Generate text, images, and videos using Cosmic's AI capabilities

Hosted endpoint (recommended)

Cosmic operates a hosted streamable-HTTP MCP server. No install required.

URL: https://mcp.cosmicjs.com/v1/buckets/{bucket-slug}

Cosmic uses separate read and write keys per bucket. Authenticate with one of:

Authorization: Bearer <read_key>                       # read-only tools
Authorization: Bearer <read_key>:<write_key>           # full access

You can also send the write key out-of-band via the X-Cosmic-Write-Key header if your client can't colon-pack the bearer token. Keys are issued in your bucket's API Access settings in the Cosmic dashboard.

Use the read key for read-only access (list/get tools), or the write key for full access including object creation, media upload, and AI generation.

Claude Desktop (remote MCP)

In Claude Desktop, Settings -> Connectors -> Add custom connector, enter:

• URL: https://mcp.cosmicjs.com/v1/buckets/your-bucket-slug
• Bearer token: for read-only access, or : for full access

Cursor (remote MCP)

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "cosmic": {
      "url": "https://mcp.cosmicjs.com/v1/buckets/your-bucket-slug",
      "headers": {
        "Authorization": "Bearer your-bucket-read-key:your-bucket-write-key"
      }
    }
  }
}

Local installation (stdio)

For environments without remote MCP support, the same server runs locally over stdio.

Using npx (recommended)

npx @cosmicjs/mcp

Global installation

npm install -g @cosmicjs/mcp
cosmic-mcp

From source

git clone https://github.com/cosmicjs/mcp.git
cd mcp
bun install
bun run build

Configuration

The server requires the following environment variables:

Getting your credentials

1. Log in to your Cosmic dashboard
2. Navigate to your bucket
3. Go to Settings → API Access
4. Copy your bucket slug, read key, and write key

Local stdio with Claude Desktop

If you prefer to run the MCP server locally rather than use the hosted endpoint, add the following to your Claude Desktop configuration file.

macOS: ~/Library/Application Support/Claude/claudedesktopconfig.json Windows: %APPDATA%\Claude\claudedesktopconfig.json

{
  "mcpServers": {
    "cosmic": {
      "command": "npx",
      "args": ["@cosmicjs/mcp"],
      "env": {
        "COSMIC_BUCKET_SLUG": "your-bucket-slug",
        "COSMIC_READ_KEY": "your-read-key",
        "COSMIC_WRITE_KEY": "your-write-key"
      }
    }
  }
}

Local stdio with Cursor

{
  "mcpServers": {
    "cosmic": {
      "command": "npx",
      "args": ["@cosmicjs/mcp"],
      "env": {
        "COSMIC_BUCKET_SLUG": "your-bucket-slug",
        "COSMIC_READ_KEY": "your-read-key",
        "COSMIC_WRITE_KEY": "your-write-key"
      }
    }
  }
}

Available Tools

Objects

Shortened. The full README is on GitHub.