33-human-in-the-loop.halo

examples/33-human-in-the-loop.halo |! people

halo

tool Approvals : Slack("Env.SLACK_BOT_TOKEN")
tool Notifier : Email("Env.RESEND_API_KEY", from: "approvals@example.com")

agent Writer [openai/gpt-4, temp: 0.7]

pipeline DraftEmail(topic: String) -> Result:
  topic
    |> Writer.prompt("Draft a professional email about this topic: {{context.input.topic}}")
    
    // Without a handler the run pauses here; resume it with signal(runId, ...) or `halo resume`
    |> Approvals.execute(
         channel: "#approvals",
         text: "Please review this draft: {{context.current}}",
         buttons: ["Approve", "Reject"]
       )
       
    // The pipeline suspends safely, waiting ONLY for a Slack Interaction signal
    ~> listen(Slack.Interaction)
    
    // Pipeline resumes here with the user's feedback, then we send the final email
    |> Notifier.execute(
         to: "client@example.com",
         subject: "Update",
         body: "Final approved message: {{context.current}}"
       )

33-human-in-the-loop.halo ​

33-human-in-the-loop.halo