teams_send_message

Microsoft Teams · macOS · Windows

Effect: send (strongest supported action). Status: gated.

Gated means the tool requires an installed app, a connected account, permission, or runtime availability. Check those requirements on the listed platform before using it.

macOS

Purpose

Sends a text message to a Microsoft Teams chat as a connected Microsoft 365 work or school account (connect_m365_account), through Microsoft 365. The chat_id MUST come from teams_list_chats of the same account — never fabricate ids. This is a write operation: the first call returns a preview, the second call (with confirm=true) actually sends. sent:true means Microsoft accepted the message; teams_search_messages reads Microsoft's search index, which can lag behind a send, so a zero-result search right after sending is NOT evidence the send failed.

Required inputs

chat_id — Chat id from teams_list_chats (e.g. '19:<uuid>_<uuid>@unq.gbl.spaces' for 1:1, '19:<id>@thread.v2' for a group)
text — Plain-text message body. Max 28000 chars. No formatting / mentions / attachments.

Permissions and confirmation

Explicit confirmation parameter: inspect the schema and tool description before any real call. The documentation example keeps confirm false. Obtain user authorization before performing the action.

Use only the apps, accounts and resources authorized by the user on this platform. Consult this tool's platform-specific description for its connection and permission requirements; this catalog does not assert additional OAuth scopes or OS entitlements.

Full input schema — macOS

{
  "properties": {
    "account": {
      "description": "Which connected Microsoft 365 account to use: its email (UPN), its id from list_m365_accounts, or its display name when unique. Leave it out to use the default account.",
      "type": "string"
    },
    "chat_id": {
      "description": "Chat id from teams_list_chats (e.g. '19:<uuid>_<uuid>@unq.gbl.spaces' for 1:1, '19:<id>@thread.v2' for a group)",
      "type": "string"
    },
    "confirm": {
      "description": "Must be true to actually send. Without it, returns a preview without making any network call.",
      "type": "boolean"
    },
    "text": {
      "description": "Plain-text message body. Max 28000 chars. No formatting / mentions / attachments.",
      "type": "string"
    }
  },
  "required": [
    "chat_id",
    "text"
  ],
  "type": "object"
}

Documentation example

Do not execute this example. These concrete inputs refer to a fictional demonstration dataset. Resolve real handles and obtain user authorization before any real call.

{
  "chat_id": "demo-chat-001",
  "confirm": false,
  "text": "Can we review the launch checklist on Tuesday?"
}

Windows