variants.weave

// variants.weave
// Shows parallel generation, a budget, and a human review gate.
// Two variants are written at the same time, both must be non-empty, then a
// human approves one before it ships (auto-approves when run non-interactively).

type Post = {
  headline: text
  body:     text
}

agent writer {
  model:   claude
  persona: "Punchy brand copywriter. No em dashes. No hashtags."
  budget:  4
}

flow variants(topic: text) -> Post {
  require topic != ""

  // generate two takes at once
  parallel {
    writer("Write variant A: a bold take on {topic}") -> a: Post
    writer("Write variant B: a calm take on {topic}") -> b: Post
  }

  ensure a.body != ""
  ensure b.body != ""

  // a human picks before it ships
  review a -> chosen: Post

  return chosen
}