Tagging an agent opens a project channel where teammates read its code diffs and rendered previews, and nothing deploys until a person approves it.
Slack released Slack Code last week, a feature that makes a shared channel the place where software gets built: AI agents do the coding while the people on the team watch the work, guide it and set its direction. It is available on any Slack plan starting at launch.
A build begins when someone mentions a coding agent in Slack — Anthropic's Claude or Cognition's Devin, for instance — and the agent answers by opening a dedicated code channel to carry out the job. The agents themselves come from the marketplace Slack runs. Slack says agents from its founding partners, among them Vercel Agent and GitHub Copilot, also work inside code channels.
Those channels are open and scoped to a single project. Anyone in one sees the full conversation and can go through the agent's code diffs, compare coding changes and view HTML output rendered before the project ships. Colleagues weigh in with feedback on what the agent has produced, and deploying the changes is gated behind human approval. Slack presents the arrangement as an easy way to work with AI agents as though they were teammates.
When the task a channel was opened for is done, the channel archives itself automatically and remains as a searchable record of the build, with an audit log.