Chat33 MCP Server

Social media MCP server for AI agents. Connect Claude, ChatGPT, Cursor, VS Code or any MCP client to Chat33 and let your agent publish and schedule posts to Instagram, Facebook, Threads, TikTok, YouTube, X, LinkedIn and Bluesky, answer Instagram and Facebook DMs and comments, and build comment-to-DM automations.

This is a hosted (remote) server. There is nothing to install or run: point your client at the URL below and sign in.

https://chat33.io/api/mcp/mcp

• Transport: Streamable HTTP

• Auth: OAuth 2.1 sign-in in the browser (dynamic client registration), or an API key header

• Docs: chat33.io/mcp

Connect your client

Prefer OAuth wherever your client supports it: add the server, choose Authenticate (or the client's login button) and approve in the browser tab that opens. No API key needed.

Claude Code

claude mcp add --transport http --scope user chat33 https://chat33.io/api/mcp/mcp

Then run /mcp, choose chat33 → Authenticate and approve in the browser.

Claude (claude.ai and Claude Desktop)

Settings → Connectors → Add custom connector → URL https://chat33.io/api/mcp/mcp → Connect, then approve in the browser.

ChatGPT

Settings → Apps / Connectors → Advanced → turn on Developer mode → Create: name Chat33, URL https://chat33.io/api/mcp/mcp, authentication OAuth. Sign in to Chat33 and click Allow.

Cursor

~/.cursor/mcp.json:

{
  "mcpServers": {
    "chat33": {
      "url": "https://chat33.io/api/mcp/mcp"
    }
  }
}

VS Code

.vscode/mcp.json in your workspace (or the user MCP config):

{
  "servers": {
    "chat33": {
      "type": "http",
      "url": "https://chat33.io/api/mcp/mcp"
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "chat33": {
      "serverUrl": "https://chat33.io/api/mcp/mcp"
    }
  }
}

Codex

codex mcp add chat33 --url https://chat33.io/api/mcp/mcp
codex mcp login chat33

Gemini CLI

gemini extensions install https://github.com/chat33-io/chat33-mcp

Clients without OAuth (API key)

Create a key in Chat33 → Settings → API Keys and send it as an x-api-key header (or Authorization: Bearer):

{
  "mcpServers": {
    "chat33": {
      "url": "https://chat33.io/api/mcp/mcp",
      "headers": { "x-api-key": "sk_live_..." }
    }
  }
}

Related MCP server: @fopost/mcp

Tools

Tools that message a real person (reply_to_conversation, reply_to_comment) tell the agent to ask for your approval first. New automations are created as drafts.

Try asking

• "Schedule this photo to Instagram and Threads for tomorrow at 9am."

• "Which DMs are waiting for a reply? Draft answers for me to approve."

• "Build a flow that DMs the guide link to anyone who comments GUIDE on my last reel."

• "How did my posts do this week?"

Limits

• Your Chat33 plan's limits on posts and connected accounts apply.

• Instagram and Facebook DM replies only work within 24 hours of the contact's last message.

• Meta allows one private reply per comment, within 7 days.

• LinkedIn: personal profiles only. Bluesky: publishing only (no DMs or comments).

Links

• Website: chat33.io

• MCP docs: chat33.io/mcp

• REST API: chat33.io/developers

• n8n node: n8n-nodes-chat33

• Support: nemanja@chat33.io

License

MIT. This repository describes the hosted server; the server itself runs at chat33.io.