mastodon-mcp

mastodon-mcp

0
communication

Mastodon MCP is a Model Context Protocol server that enables interactions with Mastodon, allowing users to create toots with customizable settings and attach media securely. It integrates with 1Password for secure credential management.

Mastodon MCP

A Model Context Protocol server that provides tools for interacting with Mastodon. Currently supports creating toots with optional media attachments.

Features

  • Create toots with customizable visibility and content warnings
  • Upload and attach media files (images, videos, audio)
  • Add alt text/descriptions to media attachments
  • Secure credential management using 1Password CLI

Prerequisites

  • Node.js 18+
  • pnpm
  • 1Password CLI (op) installed and configured
  • A Mastodon account and API access token

Installation

# Clone the repository
git clone [repository-url]
cd mastodon-mcp

# Install dependencies
pnpm install

# Build the project
pnpm build

Configuration

The tool requires a Mastodon API token stored in 1Password. Store your token at:

  • op://Personal/Floss.Social Key/notesPlain

You can optionally set the Mastodon instance URL via environment variable:

export MASTODON_INSTANCE_URL="https://your.instance.social"

If not set, it defaults to https://floss.social.

Usage

Start the MCP server:

pnpm start

The server exposes a single tool mastodon_create_toot with the following parameters:

  • content (required): The text content of your toot
  • visibility: One of "public", "unlisted", "private", or "direct" (default: "public")
  • sensitive: Boolean flag for sensitive content (default: false)
  • spoiler_text: Warning text shown before the content (default: "")
  • media_file: Path to a media file to attach
  • media_description: Alt text/description for the attached media

Example Usage with MCP Inspector

  1. Start the inspector:
npx @modelcontextprotocol/inspector node dist/mcp-server.js

  1. Open http://localhost:5173 in your browser

  2. Use the tool with parameters like:

{
  "content": "Hello from MCP!",
  "visibility": "public",
  "media_file": "/path/to/image.jpg",
  "media_description": "A beautiful sunset"
}

Development

# Run in development mode with auto-reloading
pnpm dev

# Build the project
pnpm build

# Run the built server
pnpm start

Security

  • No credentials are hardcoded in the codebase
  • API tokens are securely stored in and retrieved from 1Password
  • API responses are git-ignored to prevent accidental credential leaks

License

ISC