PostMCP AI Model Context Protocol (MCP) Server

Official PostMCP AI Model Context Protocol (MCP) Server. Connect your social media publishing pipelines directly into AI assistants, desktop applications, IDE workflows, and web environments like Claude Desktop, Claude.ai, Cursor, and ChatGPT Custom GPTs.

Supported platforms include LinkedIn, X (Twitter), Facebook, Instagram, Threads, Bluesky, and YouTube Shorts.

🚀 Features & Capabilities

• 🤖 15 Built-in Tools: Workspaces, connected accounts and their token health, brand kits, the post queue, pre-flight checks, create/schedule/reschedule/publish/retry/delete, and image generation.
• ⚡ Dual Transport Modes: Native Stdio mode (for local desktop apps & IDEs) and Streamable HTTP mode (for web services, Claude.ai, and remote connectors).
• 🔑 Flexible Authentication: Auto-detects API key from environment variables (POSTMCPAI_API_KEY), URL query parameters (?apikey=YOUR_KEY), or HTTP authorization headers (x-api-key, Bearer token).
• 🗂️ Multi-Workspace Aware: The API key carries its own workspace, so a bare key is enough. To act on another one, every tool takes an optional workspaceId, also settable per connection (?projectId=..., x-project-id) or per process (POSTMCPAI_PROJECT_ID).
• 🤖 ChatGPT Actions Compatible: Includes built-in OpenAPI 3.0 specification generator (/openapi.json) and REST endpoints (/api/tools/:name) for ChatGPT Custom GPT integration.
• 🔒 OAuth 2.0 & RFC 9728 Support: Advertises PKCE authorization server metadata for seamless dynamic client registration with Claude.ai.

📁 Repository Architecture

mcp-server/
├── bin/
│   └── cli.js            # Executable CLI entry point (Stdio / HTTP mode runner)
├── src/
│   ├── config.js         # Centralized configuration & environment loader
│   ├── client.js         # Backend API client, API key & workspace extraction
│   ├── platforms.js      # Platform limits, credit pricing & post cost helper
│   ├── tools/
│   │   ├── definitions.js# MCP tool JSON schemas & parameter specifications
│   │   ├── handlers.js   # MCP tool execution handlers
│   │   └── index.js      # Tool definitions aggregator
│   ├── server.js         # MCP Server instance factory
│   ├── routes/
│   │   ├── oauth.js      # OAuth 2.0 & RFC 9728 discovery endpoints
│   │   ├── openapi.js    # OpenAPI 3.0 schema & ChatGPT REST endpoints
│   │   ├── mcpHttp.js    # MCP Streamable HTTP transport (/mcp)
│   │   └── health.js     # Health check & system metadata endpoints
│   ├── app.js            # Express application factory
│   └── index.js          # Main library entry point
├── index.js              # Executable wrapper script
├── package.json
└── README.md

⚙️ Environment Configuration

🛠️ MCP Tools Reference

Every tool below also accepts an optional workspaceId (from list_workspaces) to act on a specific workspace.

Reading

Writing

Batching

{
  "calls": [
    { "id": "img", "tool": "generate_image", "arguments": { "prompt": "launch banner" } },
    {
      "tool": "create_post",
      "arguments": {
        "content": "We shipped it 🚀",
        "targetAccounts": [
          { "platform": "linkedin", "profileId": "lin_7741903" },
          { "platform": "twitter", "profileId": "tw_1293847", "content": "We shipped it 🚀" }
        ],
        "scheduleDate": "2026-09-01",
        "scheduleTime": "10:00",
        "timezone": "Asia/Kolkata"
      }
    }
  ],
  "stopOnError": true
}

The reply carries one entry per call — { id, tool, ok, result } or { id, tool, ok: false, error } — plus counts and, when a failure stopped the batch, the calls that were skipped.

Notes for clients

• Target profiles, not platforms. targetAccounts sends only to the profiles named; platforms fans out to every connected profile on each platform.
• One post per profile. create_post stores a separate post per targeted profile, so each can be edited, retried or cancelled on its own. Give per-profile copy through targetAccounts[].content or the variants map.
• Always pass timezone when a wall-clock time matters. The backend defaults to UTC, so a 9:00 IST post scheduled without a zone goes out at 14:30 IST.
• Credits are charged per profile delivered to (X/Twitter costs 5, others 1), plus a one-off 50-credit surcharge when the copy contains a link. preflight_post reports this before you commit.

💻 Client Integration Guides

1. Claude Desktop App (Stdio Mode)

Add the configuration below to your Claude Desktop config file:

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

{
  "mcpServers": {
    "postmcpai": {
      "command": "npx",
      "args": ["-y", "@postmcpai/server"],
      "env": {
        "POSTMCPAI_API_KEY": "pmcp_sec_your_secret_api_key_here"
      }
    }
  }
}

2. Cursor IDE

1. Open Cursor Settings -> Features -> MCP.
2. Click + Add New MCP Server.
3. Fill in the details:
   • Name: postmcpai
   • Type: command
   • Command: npx -y @postmcpai/server
4. Under Environment Variables, add:
   • POSTMCPAI_API_KEY = pmcp_sec_your_secret_api_key_here
5. Click Save.

3. Claude.ai & Remote Web Connectors (Streamable HTTP / SSE Mode)

Host this server on any cloud service (Render, Railway, Fly.io, Vercel) or tunnel your local machine using ngrok.

Launching in HTTP Mode:

export POSTMCPAI_API_KEY="pmcp_sec_your_secret_api_key_here"
export PORT=3000

npm run start:sse

Connecting to Claude.ai:

1. Provide your public MCP URL with your API key attached: https://your-hosted-domain.com/mcp?apikey=pmcp_sec_your_secret_api_key_here
2. Claude.ai will discover tool capabilities via /mcp and authenticate seamlessly.
3. That URL is all you need: the key is bound to the workspace it was issued from, so tools act on that workspace without being told. To point the same key at a different workspace, append &projectId=YOUR_WORKSPACE_ID (or send an x-project-id header); individual tool calls can still override either with workspaceId.

4. ChatGPT Custom GPTs (REST Actions)