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New in this release: The frontier_parents field (plural) is now accepted alongside the existing frontier_parent field. Use frontier_parents to seed a run from multiple parent candidates simultaneously.

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frontier_parents

An optional array of frontier parent objects. When provided, the improve run is seeded from all listed parents, letting the search explore mutations branching from multiple high-performing starting points at once. Use frontier_parents when you have more than one candidate you want to evolve from in parallel. Use the singular frontier_parent when you have a single known best-performing parent. 
{
  "frontier_parents": [
    { "run_id": "run_abc123", "candidate_id": "cand_1" },
    { "run_id": "run_def456", "candidate_id": "cand_2" }
  ]
}
frontier_parents and frontier_parent are mutually exclusive — pass one or the other, not both.