# OpenEvolve — faithful port of the real OpenEvolve (open AlphaEvolve) defaults.
# Sections mirror the six core components; only the components OpenEvolve tunes appear here.
seed: 42                             # OpenEvolve DatabaseConfig.random_seed default
general:
  max_iterations: 100
  max_solution_length: 10000         # OpenEvolve Config.max_code_length default (over-length children rejected)
population:                          # MapElitesIslandsPopulation
  num_islands: 5
  archive_size: 100
  population_size: 1000
  feature_dimensions: [complexity, diversity]
  feature_bins: 10
  migration_interval: 50            # migrate every N island generations
  migration_rate: 0.1              # fraction of each island migrated to ring neighbours
  diversity_reference_size: 20
selection_policy:                   # OpenEvolveSelectionPolicy
                                    # (also reads population.num_islands + population.feature_dimensions)
  exploration_ratio: 0.2           # P(uniform-random parent from current island)
  exploitation_ratio: 0.7          # P(fitness-weighted parent from the archive)
  elite_selection_ratio: 0.1       # top fraction of island used as inspirations
  num_inspirations: 3              # prompt.num_top_programs (the PromptBuilder reuses this count)
  num_diverse: 2                   # prompt.num_diverse_programs
proposer:                          # OpenEvolve LLMConfig defaults (apply only to a model built from this preset)
  top_p: 0.95
  max_tokens: 4096
  timeout: 60
  # OpenEvolve's default is a weighted 2-model ensemble; galapagos uses your injected model by default.
  # To replicate the upstream default, uncomment a `models:` list — build_model samples one model per
  # generate() by normalized weight (EnsembleModel). Provider/host/keys are yours to set:
  # models:
  #   - {name: gemini-2.0-flash-lite, weight: 0.8, host: openrouter}
  #   - {name: gemini-2.0-flash,      weight: 0.2, host: openrouter}
# NOTE: upstream `diff_based` / `allow_full_rewrite` / `max_code_length` are NOT exposed:
# OpenEvolveProposer is hard-wired to whole-line SEARCH/REPLACE diffs (apply_diff), no full-rewrite
# fallback — a response with no valid diff block is a no-op, as the reference discards it in diff mode.
# Cascade evaluation is task-owned (runs evaluate_stageN when the task defines them); the scaffold
# applies OpenEvolve's cascade_thresholds [0.5, 0.75, 0.9] unless the task card sets its own.