Teams: add support for 1:1 and group chat messages

[BrewingCoder]

Summary

The Teams integration currently supports only channel messages via /teams/{id}/channels/{id}/messages. Direct messages (1:1 chats) and group chats use a separate Graph API endpoint (/me/chats) that is not yet implemented.

Current Behavior

teams_messages only reads from team channels. There is no way to list, read, or send 1:1 or group chat messages.

Proposed Change

Add support for the Chat API:

• /me/chats — list all chats (1:1, group, meeting)
• /me/chats/{id}/messages — read messages in a chat
• /me/chats/{id}/messages (POST) — send a message to a chat

New tools / commands

• teams_chats / outpost teams chats — list recent chats
• teams_chat_messages / outpost teams chat-messages <chat-id> — read messages from a chat
• teams_chat_send / outpost teams chat-send <chat-id> --body "..." — send a message to a chat

Additional scopes required

• Chat.Read or Chat.ReadWrite
• ChatMessage.Read or ChatMessage.Send

These should be added to the Teams FEATURE_SCOPES group since they require the same opt-in consent flow.

Graph API Reference

• List chats
• List messages in chat
• Send message in chat

[github-actions]

Triage Summary

Priority: 🟠 high
Component: teams

Teams integration currently lacks support for direct messages and group chats, only supporting channel messages. This is a significant feature gap since 1:1 and group chats are core Teams communication methods. Implementation requires adding three new tools to access the Chat API endpoints with appropriate scopes.

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