{
  "release": "SynSearch-Data",
  "samples": 5000,
  "unique_tasks": 4182,
  "source_rows": 13835,
  "dropped_untraceable_or_text_matched": 1123,
  "dropped_single_hop": 1106,
  "seed_provenance_covered": 4172,
  "hops_distribution": {
    "2": 1965,
    "3": 1732,
    "4": 786,
    "5": 287,
    "6+": 230
  },
  "difficulty_distribution": {
    "good": 1217,
    "broken": 2564,
    "too_easy": 227,
    "too_hard": 24,
    "null": 150
  },
  "selection_rule": "one best trajectory per task (fewest turns); 818 tasks contribute a second trajectory to reach 5K",
  "filter": "strict audit (exact message-hash match only) AND hops>=2",
  "first_trajectories": 4182,
  "second_trajectories": 818
}