Feature request: Add setReaction tool for Teams messages

[BenGWeeks]

Summary

Please add a setReaction tool to allow adding emoji reactions to Teams chat and channel messages.

Use Case

AI agents using this MCP server need to react to Teams messages (e.g., acknowledge receipt with a 👍, indicate processing with ⏳, confirm completion with ✅). Currently the server supports sending messages and replies, but not reactions.

Graph API Reference

The Microsoft Graph API supports this via:

• POST /chats/{chat-id}/messages/{message-id}/setReaction
• POST /teams/{team-id}/channels/{channel-id}/messages/{message-id}/setReaction

Documentation: https://learn.microsoft.com/en-us/graph/api/chatmessage-setreaction

Required Permissions

• ChatMessage.Send (delegated) - for chat messages
• ChannelMessage.Send (delegated) - for channel messages

Note: This requires delegated permissions (user context), not application permissions.

Suggested Tool Interface

{
  name: "teams_set_reaction",
  parameters: {
    chatId: string,      // or channelId + teamId
    messageId: string,
    reactionType: string // e.g., "like", "heart", "laugh", "surprised", "sad", "angry"
  }
}

Additional Context

We're using this MCP server with MoltBot for an AI sales agent that communicates via Teams. Being able to react to messages would significantly improve the user experience.

Thanks for the great MCP server!

[eirikb]

Hi

That's a good suggestion, but how about just adding tools like normal?

  {
    "pathPattern": "/chats/{chat-id}/messages/{chatMessage-id}/setReaction",
    "method": "post",
    "toolName": "set-chat-message-reaction",
    "workScopes": ["ChatMessage.Send"]
  },
  {
    "pathPattern": "/chats/{chat-id}/messages/{chatMessage-id}/unsetReaction",
    "method": "post",
    "toolName": "unset-chat-message-reaction",
    "workScopes": ["ChatMessage.Send"]
  },
  {
    "pathPattern": "/teams/{team-id}/channels/{channel-id}/messages/{chatMessage-id}/setReaction",
    "method": "post",
    "toolName": "set-channel-message-reaction",
    "workScopes": ["ChannelMessage.Send"]
  },
  {
    "pathPattern": "/teams/{team-id}/channels/{channel-id}/messages/{chatMessage-id}/unsetReaction",
    "method": "post",
    "toolName": "unset-channel-message-reaction",
    "workScopes": ["ChannelMessage.Send"]
  },