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Slack agents ask approval with buttons and show task progress

Changelog

Feature Platform CloudAgent protocols

In 0.30.0

Three additions for agents running in Slack:

  • Approvals: when an agent pauses with request_approval, the thread shows buttons. Only the person the agent is answering can use them, and answering removes the buttons. Apps created earlier must save a fresh manifest once.
  • Task progress: a delegating agent posts one message, updated in place, that summarizes its sub-tasks, for example how many finished or failed.
  • Slack actions: a native slack capability adds slack_add_reaction, slack_update_message, slack_lookup_user and slack_upload_file, using the endpoint’s own bot token instead of a separate Slack MCP server.

See Slack approvals, task progress and Slack actions. #3696, #3697, #3693