Discord MCP Server

Discord MCP Server with Bearer Token Authentication

A secure Discord MCP (Model Context Protocol) server that provides Discord integration tools with JWT Bearer Token authentication.

🔐 Security Features

Bearer Token Authentication using JWT tokens
Discord token protection - tokens are embedded in JWT claims, not passed as parameters
Audit logging - all tool calls are logged with user information
Temporary bot connections - no persistent Discord bot instances
RSA key pair encryption for token signing and verification

📋 Available Tools

Tool	Description
`send_message`	Send messages to Discord channels
`get_messages`	Fetch recent messages from channels
`get_channel_info`	Get channel metadata and information
`search_messages`	Search for messages containing keywords
`moderate_content`	Delete specific messages from channels

🚀 Setup and Installation

Prerequisites

Python 3.8+
Discord bot token with appropriate permissions
Virtual environment (recommended)

Installation

Install dependencies (already installed in your venv):
pip install discord.py fastapi fastmcp uvicorn python-dotenv PyJWT
Create a Discord bot and get your bot token:
- Go to Discord Developer Portal
- Create a new application and bot
- Copy the bot token
- Invite the bot to your server with necessary permissions
Set up environment variables (optional):
# Create .env file echo "DISCORD_TOKEN=your_discord_bot_token_here" > .env

🏃‍♂️ Running the Server

Start the Server

python app.py

The server will start on http://localhost:8000 and display:

Available tools
Authentication information
Token generation instructions

Generate Access Token

Replace YOUR_DISCORD_TOKEN with your actual Discord bot token:

python -c "from app import generate_access_token; print(generate_access_token('YOUR_DISCORD_TOKEN'))"

🔧 Using the Server

Authentication

All requests must include a JWT Bearer token in the Authorization header:

Authorization: Bearer <your_jwt_token>

Making Tool Calls

Endpoint: POST /mcp/v1/tools/invoke

Headers:

Authorization: Bearer <your_jwt_token>
Content-Type: application/json

Request Format:

{
  "method": "tool_name",
  "params": {
    "parameter1": "value1",
    "parameter2": "value2"
  }
}

Examples

Get Channel Information

curl -X POST http://localhost:8000/mcp/v1/tools/invoke \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "get_channel_info",
    "params": {
      "channel_id": "1234567890123456789"
    }
  }'

Send a Message

curl -X POST http://localhost:8000/mcp/v1/tools/invoke \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "send_message",
    "params": {
      "channel_id": "1234567890123456789",
      "message": "Hello from MCP server!"
    }
  }'

Search Messages

curl -X POST http://localhost:8000/mcp/v1/tools/invoke \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "search_messages",
    "params": {
      "channel_id": "1234567890123456789",
      "query": "hello",
      "limit": 10
    }
  }'

🧪 Testing

Use the provided test script to verify your setup:

# Update YOUR_DISCORD_TOKEN in test_server.py first
python test_server.py

📊 Monitoring and Logs

Audit logs are written to audit.log
Server logs are displayed in the console
Each tool call is logged with user ID, parameters, and success/failure status

🏗️ Architecture

Authentication Flow

Token Generation: Discord token is embedded in JWT claims
Request Authentication: JWT is validated using RSA public key
Token Extraction: Discord token is extracted from validated JWT
Tool Execution: Temporary Discord bot connection is created
Cleanup: Bot connection is properly closed after operation

Security Benefits

No token exposure: Discord tokens never appear in request parameters
Centralized auth: Single authentication point for all tools
Audit trail: Complete logging of all authenticated operations
Temporary connections: No persistent bot instances reduce attack surface

🔒 Security Considerations

Development vs Production

Development: Uses generated RSA key pairs (current setup)
Production: Should use external OAuth 2.1 provider or IdP

Token Security

JWT tokens expire after 1 hour (configurable)
Discord tokens are embedded in JWT claims, not visible in requests
RSA encryption ensures token integrity

Best Practices

Rotate tokens regularly in production
Use HTTPS for all communications
Store Discord tokens securely (environment variables, secrets manager)
Monitor audit logs for unusual activity
Implement rate limiting if needed

🤝 Integration with MCP Clients

This server follows the MCP specification and can be used with:

Claude Desktop with MCP integration
Custom MCP clients
API testing tools (Postman, curl, etc.)

📚 References

🐛 Troubleshooting

Common Issues

"No Discord token found in authentication"
- Verify your JWT token contains the Discord token in claims
- Check token generation with correct Discord bot token
"Bot doesn't have permission"
- Ensure Discord bot has necessary permissions in the server
- Check channel permissions specifically
"Server not reachable"
- Verify server is running on localhost:8000
- Check for port conflicts
"Invalid token"
- Token may be expired (1 hour default)
- Generate a new token
- Verify token format in Authorization header

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

A secure server that enables interaction with Discord channels through JWT-authenticated API calls, allowing users to send messages, fetch channel data, search content, and perform moderation actions.

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