The Microsoft Teams platform adapter for @copilotkit/channels. It's a concrete PlatformAdapter that plugs Teams into the platform-agnostic bot engine, exactly like @copilotkit/channels-slack does for Slack. You write your bot once with createBot (handlers, JSX, tools, context) and run it on Teams by adding this adapter.

It is built on the Microsoft 365 Agents SDK (@microsoft/agents-hosting), the successor to the Bot Framework SDK.

Install

pnpm add @copilotkit/channels @copilotkit/channels-ui @copilotkit/channels-teams

Quickstart

import { createBot } from "@copilotkit/channels";
import { teams } from "@copilotkit/channels-teams";

const bot = createBot({
  adapters: [teams({ port: 3978 })],
});

bot.onMessage(({ thread, message }) => thread.post(`Echo: ${message.text}`));

await bot.start(); // POST /api/messages now listening on :3978

Then point the Microsoft 365 Agents Playground at it. No Microsoft credentials are required for local development:

npx @microsoft/m365agentsplayground   # opens http://localhost:56150

The Playground connects to http://127.0.0.1:3978/api/messages and gives you a Teams-like chat UI to test against. See examples/teams for a complete, runnable echo bot, and the Microsoft Teams guide for sideloading into real Teams via Azure Bot Service.

How it maps onto the `PlatformAdapter` contract

Ingress: a CloudAdapter receives Teams activities at POST /api/messages (stood up by an Express server). Each message activity is normalized into sink.onTurn(...). Uploaded files ride along as attachments: buildFileContentParts downloads them (a file.download.info URL, or a data:/https media URL) and hands the agent multimodal content parts — CSV/JSON/text as decoded text, images and PDFs as binary. That's what makes "upload a CSV → get a chart" work. Note Teams only delivers uploaded files to a bot in 1:1 (personal) chat (requires supportsFiles: true in the app manifest); in a channel or group chat Teams does NOT send the file to the bot at all, so chart-from-data there means pasting the data inline.
Egress: structured/interactive UI is rendered to an Adaptive Card (1.5) and sent as an attachment; a reply that collapses to plain text is sent as a normal text activity (a bare Echo: hi shouldn't be a card). Both go out on the live TurnContext within the originating turn. The engine awaits the whole turn handler, so a reply (or a full runAgent() loop) completes before the HTTP response closes. (Out-of-turn / proactive sends fall back to CloudAdapter.continueConversation via the captured conversation reference.)
Files out: postFile posts a file to the conversation. An image (e.g. a rendered chart PNG) is sent as an inline attachment via a data: URI, so it renders directly in the thread — the bot-slack postFile parallel.
Streaming: text replies stream by message edit (Teams' baseline model). It posts the first content, then updateActivity edits the same message as the buffer grows (throttled and serialised; see TeamsMessageStream), after a typing indicator. Native token streaming is a later enhancement.
Agent runs: createRunRenderer bridges AG-UI events to Teams. Each text message is streamed by edit, and tool calls plus interrupts are captured for the run loop.
History: Teams does not hand the bot a queryable transcript, so an in-memory TeamsConversationStore keeps one per conversation and seeds each agent run with it. Swap in a durable ConversationStore for production.

Options

teams({
  port: 3978, // POST /api/messages port (Playground default)
  clientId, // Microsoft app id; omit for anonymous local dev
  clientSecret, // omit for anonymous local dev
  tenantId, // omit for multi-tenant / anonymous
  interruptEventNames, // custom-event names treated as agent interrupts
});

Credentials also resolve from the clientId / clientSecret / tenantId environment variables (the names the M365 Agents SDK reads).

Status & roadmap

Implemented: message ingress; Adaptive Card rendering of the bot-ui vocabulary (<Header>, <Section>/<Markdown>, <Fields>, <Table>, <Image>, <Actions>/<Button>, <Select>, <Input>, <Context>) with a plain-text path for bare replies and a Markdown table fallback; streamed-by- edit text replies with a typing indicator; runAgent tool-call / interrupt capture; card-action round-trip + HITL (below); conversation history; update / delete. Verified in the M365 Agents Playground.

Card-action round-trip + HITL. Adaptive Card Action.Submit clicks arrive as Message activities carrying the action data in activity.value; decodeInteraction parses our opaque ckActionId + button value and routes them to sink.onInteraction, which resolves the engine's awaitChoice waiter and runs the button's onClick (e.g. to edit the picker in place). A tool handler that calls await thread.awaitChoice(<Card/>) therefore gates the agent on a human decision; see examples/teams for an approve/reject demo. Ingress and interaction decoding derive the conversation key from one shared helper (conversationKeyOf) so the waiter always resolves.

Async turn handoff. When credentialed, ingress acks the inbound turn immediately and runs the agent on a detached continueConversation context, so an awaitChoice suspend can outlive the Teams turn window (approval minutes later). In the anonymous local Playground (where continueConversation has no app id) the run uses the inbound turn context, which localhost holds open across the suspend. Waiters are in-memory (v1), so they don't survive a process restart.

Planned follow-ups (the architecture leaves room for each):

Native token streaming: token-by-token replies via the SDK's StreamingResponse (queueInformativeUpdate / queueTextChunk / endStream), vs. the current post-then-edit model.
Durable HITL waiters: persist pending awaitChoice state so approvals survive a restart (today they're in-memory).
User lookup (Microsoft Graph) and arbitrary non-image file upload via the Teams/Graph file-consent flow (today postFile handles inline images).

Exports

teams, TeamsAdapter, TeamsAdapterOptions, TeamsReplyTarget, ConversationKey; TeamsConversationStore; createRunRenderer; conversationKeyOf / parseCardAction; renderTeamsMarkdown; renderAdaptiveCard / AdaptiveCard / isPlainText / ADAPTIVE_CARD_CONTENT_TYPE; TEAMS_LIMITS; TeamsMessageStream; createTeamsServer / TeamsServer / TeamsServerConfig; SanitizingHttpAgent; buildFileContentParts / TeamsAttachmentRef / FileDeliveryConfig.

README.md

@copilotkit/channels-teams