Teams MCP Server (Secure)

A secure Microsoft Teams MCP server using only official Microsoft packages.

Security

This server uses exclusively official Microsoft packages:

Package	Source	Purpose
@azure/identity	Microsoft Azure SDK	Authentication
@microsoft/microsoft-graph-client	Microsoft Graph SDK	Graph API calls
@modelcontextprotocol/sdk	Anthropic MCP	MCP protocol

No third-party authentication or API wrappers.

Prerequisites

• Node.js 18+
• Azure CLI (az login) - required for authentication

Installation

npm install
npm run build

Authentication

The server uses Azure CLI credentials (az login). For enterprise tenants with Conditional Access policies blocking Graph API Chat permissions, use the Power Automate integration instead.

Power Automate Integration (Recommended for Enterprise)

If your organization blocks direct Graph API access to Teams chats, you can use Power Automate as a bridge:

One-time Setup

1. Go to Power Automate
2. Create a new Instant cloud flow
3. Add trigger: "When an HTTP request is received"
4. Click "Use sample payload" and enter: {"message": "Hello"}
5. Add action: "Post message in a chat or channel" (Microsoft Teams)
6. Configure the Teams action with your target chat/channel
7. For Message, select message from Dynamic content
8. Save and turn on the flow
9. Copy the HTTP POST URL from the trigger

Usage

# Set your Power Automate flow URL
export POWER_AUTOMATE_URL="https://....powerplatform.com/.../invoke?api-version=1"

# Post a message (uses Azure AD auth automatically)
curl -X POST "$POWER_AUTOMATE_URL" \
  -H "Authorization: Bearer $(az account get-access-token --resource https://service.flow.microsoft.com/ --query accessToken -o tsv)" \
  -H "Content-Type: application/json" \
  -d '{"message": "Hello from MCP!"}'

Usage

Add to your MCP config

VS Code (.vscode/mcp.json):

{
  "servers": {
    "teams": {
      "type": "stdio",
      "command": "node",
      "args": ["C:/teams-mcp/dist/index.js"]
    }
  }
}

Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "teams": {
      "command": "node",
      "args": ["C:/teams-mcp/dist/index.js"]
    }
  }
}

Available Tools

Tool	Description
get_current_user	Get authenticated user info
list_chats	List user's Teams chats
list_teams	List joined Teams
list_channels	List channels in a Team
send_chat_message	Send message to a chat (requires Graph permissions)
send_channel_message	Send message to a channel (requires Graph permissions)
get_chat_messages	Get messages from a chat
get_channel_messages	Get messages from a channel
send_via_power_automate	Send message via Power Automate (bypasses Graph restrictions)

Examples

Send a message via Power Automate (Recommended)

{
  "tool": "send_via_power_automate",
  "arguments": {
    "flowUrl": "https://....powerplatform.com/.../invoke?api-version=1",
    "message": "Hello from MCP!"
  }
}

Send a message to a chat (requires Graph permissions)

{
  "tool": "send_chat_message",
  "arguments": {
    "chatId": "19:abc123@thread.v2",
    "message": "Hello from MCP!"
  }
}

License

MIT