CrossPost MCP Server

Cross-post to X, Bluesky, LinkedIn, and Threads from Claude, Cursor, or any MCP-compatible AI assistant. Write once, publish everywhere.

Prerequisites

1. Create a free account at crosspost-app.vercel.app
2. Connect your social media accounts on the dashboard
3. Generate an API key from Settings → API Keys

Installation

Option 1: Claude Desktop (one-click)

Download crosspost-mcp.mcpb from the releases page and double-click it. Claude Desktop will prompt you for your API key — paste it in and you're done.

Option 2: npx (works everywhere)

No installation needed. Add this to your MCP client config:

{
  "mcpServers": {
    "crosspost": {
      "command": "npx",
      "args": ["-y", "crosspost-mcp"],
      "env": {
        "CROSSPOST_API_KEY": "your-api-key-here"
      }
    }
  }
}

Config file locations:

| Client | Config path | |---|---| | Claude Desktop (macOS) | ~/Library/Application Support/Claude/claude_desktop_config.json | | Claude Desktop (Windows) | %APPDATA%\Claude\claude_desktop_config.json | | Cursor | .cursor/mcp.json in your workspace, or ~/.cursor/mcp.json globally |

Option 3: Claude Code (CLI)

claude mcp add crosspost -- npx -y crosspost-mcp

Then set the env var in your shell:

export CROSSPOST_API_KEY="your-api-key-here"

Option 4: Manual (clone and build)

git clone https://github.com/jennyouyang/crosspost-mcp.git
cd crosspost-mcp
npm install && npm run build

Then point your MCP client to the built file:

{
  "mcpServers": {
    "crosspost": {
      "command": "node",
      "args": ["/path/to/crosspost-mcp/dist/index.js"],
      "env": {
        "CROSSPOST_API_KEY": "your-api-key-here"
      }
    }
  }
}

Available Tools

| Tool | Description | |---|---| | list_accounts | See your connected platforms and their status | | create_post | Publish or schedule a post across platforms | | list_posts | View recent posts and their per-platform status | | get_post | Get detailed info on a specific post | | cancel_post | Cancel a scheduled post | | reschedule_post | Change the time of a scheduled post | | list_scheduled | View all upcoming scheduled posts |

Usage Examples

Once installed, just talk to Claude naturally:

• "Post 'Hello world!' to all my platforms"
• "Post this to Bluesky and Threads: Just shipped a new feature!"
• "Schedule a post for tomorrow at 9am: Big announcement coming soon"
• "Show me my recent posts"
• "What accounts do I have connected?"

Environment Variables

| Variable | Required | Description | |---|---|---| | CROSSPOST_API_KEY | Yes | Your API key from the CrossPost dashboard | | CROSSPOST_API_URL | No | API URL (defaults to production). Only change if self-hosting. |

License

MIT