mcp-server-mattermost

This project implements a Model Context Protocol (MCP) server for Mattermost integration. It connects to Mattermost API endpoints to retrieve and process various information, making it available through standard MCP transports.

Features

• Secure, token-based connection to Mattermost API endpoints

• Supports multiple transport modes:

  • stdio

  • http-stream

  • sse

• Search for messages across multiple Mattermost channels

• Customizable default channels and message fetch limits

Related MCP server: MCP Boilerplate

Requirements

• Node.js >= 22

• npm >= 10

Setup

1. Clone this repository:

git clone https://github.com/kakehashi-inc/mcp-server-mattermost.git
cd mcp-server-mattermost

2. Install dependencies:

npm install

3. Set up your environment variables:

Required Environment Variables

• MATTERMOST_ENDPOINT: Your Mattermost server URL

• MATTERMOST_TOKEN: Your Mattermost authentication token

• MATTERMOST_TEAM: The name of the team to monitor

• MATTERMOST_CHANNELS: Comma-separated list of channel names to monitor

Environment Variable Setup Options

Option 1: Direct Environment Variables

export MATTERMOST_ENDPOINT="https://your-mattermost-server.com"
export MATTERMOST_TOKEN="your-token-here"
export MATTERMOST_TEAM="your-team-name"
export MATTERMOST_CHANNELS="general,random,dev"

Option 2: Using .env file (with dotenvx)

# Install dotenvx (optional)
npm install -g @dotenvx/dotenvx

# Create .env file
cp .env.example .env
# Edit .env file with your values

# Encrypt your .env file (recommended for production)
dotenvx encrypt

4. Build the server:

npm run build

Usage

The server supports three transport modes: stdio (default), sse, and http-stream.

Standard I/O Transport Mode

# Using npm scripts (with dotenvx)
npm run start:stdio

# Direct execution
node dist/main.js --transport stdio

# Using npx
npx mcp-server-mattermost --transport stdio

SSE Transport Mode

# Using npm scripts (with dotenvx)
npm run start:sse

# Direct execution
node dist/main.js --transport sse

HTTP Transport Mode

# Using npm scripts (with dotenvx)
npm run start:http

# Direct execution
node dist/main.js --transport http-stream

Claude Desktop Integration

To use this MCP server with Claude Desktop, add the following configuration to your Claude Desktop settings:

Sample Configuration

{
  "mcpServers": {
    "mattermost": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-mattermost@latest",
        "--transport", "stdio",
        "--endpoint", "https://your-mattermost-server/api/v4",
        "--token", "your_personal_access_token",
        "--team", "your_team_name",
        "--channels", "town-square,general,your_channel_name"
      ]
    }
  }
}

Development

• npm run dev: Start the server in development mode with hot reload

• npm run lint: Run ESLint

• npm run format: Format code using Prettier

• npm test: Run tests

• npm run inspect: Run MCP inspector

References

• Model Context Protocol TypeScript SDK

• MCP inspector

License

MIT