Postlint MCP Server

Overview

Postlint MCP Server lets you validate social media posts against the real character limits of X, Bluesky, LinkedIn, Threads, and Mastodon. By speaking the Model Context Protocol, it integrates with AI assistants like Claude as callable tools, so you can check post length without leaving your workflow.

The server runs locally via npx -y @conorbronsdon/postlint-mcp with no authentication required. It works out of the box on your machine. Version v1.1.0 is published under the Apache-2.0 license, with source code available at conorbronsdon/postlint-mcp on GitHub.

Postlint MCP Server is listed in the Development category on mcp.site and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. Maintainers are welcome to claim this listing to verify ownership and keep information current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "postlint_mcp_server": {
      "command": "npx",
      "args": [
        "-y",
        "@conorbronsdon/postlint-mcp"
      ]
    }
  }
}