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notableaddedSlack calls it: New Feature, Announcement

Announcing Slack Code

Announced
APIs
platform
Severity
notable, set by reef/slack-rule-v1
Source
https://docs.slack.dev/changelog/2026/08/20/slack-code

An agent can answer a question in a thread, but some tasks become bigger than a single question. A coding agent may need to implement a change, share a prototype, and iterate on it. A research agent may need to gather information and work through decisions with the people involved. This kind of work needs more than a single response.

Slack Code is how agents and people work together to build with AI in Slack, creating dedicated channels for more involved work. A channel is created from an existing conversation, context is carried forward, and agents and collaborators have a shared, visible place to work.

Within a session, agents can publish artifacts for people to oversee and iterate on:

  • Code diffs, so people can review what changed
  • Block Kit views, for structured interactive experiences
  • HTML previews, for prototypes and generated interfaces
  • Canvases, for longer-form content and collaboration

The work becomes multiplayer: teammates can join channels, review work, add context, and help make decisions, all while collaborating in the same session and with the same artifacts. Your agent manages the lifecycle, creating a channel when a task warrants one, sharing updates as the work progresses, and closing the session once the work is complete.

Read on to learn more:

The text above is Slack's. reef added the severity, the dates it could read from the text, and the endpoints and scopes named in code.