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 or channel. Requires Microsoft Teams to be running and signed in (token is read fresh from Teams' local cookies on each call). The chat_id MUST come from a previous teams_list_chats call — 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 the message was read back from the conversation (delivery verified) — trust THAT field, not a follow-up read: teams_search_messages and teams_read_chat_messages read Teams' own local sync index, which can lag a verified send by minutes (single observed case: 3 min, #2285). A zero-result sibling read right after sending is NOT evidence the send failed. A response with status "sent_unconfirmed" means the server accepted the POST but the message could NOT be verified — tell the user to open Teams itself and check before assuming the recipient was notified.

Required inputs

chat_id — Thread id from teams_list_chats (e.g. '19:<uuid>_<uuid>@unq.gbl.spaces' for 1:1, '19:<uuid>@thread.tacv2' for group)
text — Plain-text message body. Max 28000 chars. No formatting / mentions / attachments in v1.

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": {
    "chat_id": {
      "description": "Thread id from teams_list_chats (e.g. '19:<uuid>_<uuid>@unq.gbl.spaces' for 1:1, '19:<uuid>@thread.tacv2' for 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 in v1.",
      "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