The next wave of Agent messaging experience

We're rolling out a wave of updates to agents on Slack, along with an important heads-up about the road ahead for the Assistant messaging experience.

Agent updates and the deprecation of assistant_view​

The Assistant messaging experience (assistant_view) will be deprecated in February 2027. The assistant-related methods that power it are being replaced by a new set of API methods: the Agent Sessions API. Agent sessions let users manage their conversations with your agent in one place, with a status, a title, and a stop button. The agents.sessions.setStatus and agents.sessions.rename API methods replace the assistant.threads.setStatus and assistant.threads.setTitle API methods, respectively. For now, your existing calls keep working through a compatibility bridge. See the Agent sessions guide to get started.

The Agent messaging experience (agent_view) is already available, and we recommend moving to it now. If your app still uses assistant_view, follow the migration guide to move to the new experience. Read more in the guide to developing agents.

What's new for agents​

Alongside this announcement, we're releasing a set of improvements to the agent experience:

• Upgraded Tools tab: a newly renamed and revamped Agents & Tools tab helps users find popular agents with a new landing page.
• Improved thread experience: including multi-agent stacking, thread naming, a revamped thinking UI, and a native stop button for agent streams. When a user stops your agent, your app receives an agent_session_stopped event.
• Plan and Task card block updates: UI refinements to the plan and task card blocks agents use to show their work.
• Marketplace data in the About tab: an agent's Marketplace data now appears in its About tab.
• Agent sessions in the sidebar: A new sidebar with pin / archive / unread and live updates.