Chat SDK adds native support for Slack agents

With Chat SDK's new Slack adapter, you can build Slack agents directly in the Messages tab. It supports the full agent messaging experience, including suggested prompts, rotating status messages, token-by-token streaming responses, and native feedback buttons.

The adapter's key features are as follows:

• Per-thread suggested prompts: You can pass either a static payload or an async resolver that receives thread context, including what the current user is viewing (agent_view). Prompts are automatically pinned when an agent thread is opened.

• Native streaming and fallback: Responses render token-by-token via Slack's streaming API, including task and plan cards. In workspaces that don't support streaming, like GovSlack, it automatically falls back to a post-then-edit approach with no content loss.

• Built-in feedback: Setting feedbackButtons: true shows Slack's native 👍👎 buttons at the end of every streaming response. Clicks are routed through the normal bot.onAction flow.

One thing to note is that in agent_view, since Slack treats each user message as a separate thread, channel history only returns the user's side of the DM. To build AI conversation history, you should use the Chat SDK transcript.