{
 "measurement": "Does CLAUDE_CODE_FORK_SUBAGENT reduce the cost of parallel subagents",
 "claude_code_version": "2.1.227",
 "gate_read_from_shipped_binary": "if(coordinatorMode())disabled; if(truthy(env))\"env\"; if(falsy(env))disabled; if(!isInteractive())disabled; if(rollout)\"gb_rollout\"; else disabled",
 "reporting": "Cells are MEDIANS of 4 runs (the explicit-0 control arm has 2). Medians of an even count can land on .5; values are printed rounded to the nearest integer.",
 "method": {
  "task": "N parallel subagents each create one file containing DONE.",
  "arrival_control": "N files must exist on disk; a run whose count != N is recorded unscored. files_created is published per run so this is checkable.",
  "warmth_control": "the warm arm first reads a 150KB file and must echo a marker planted PAST the end of it. The harness cannot return status ok otherwise, and warmth_control_passed is recorded per run.",
  "tokens": "modelUsage, reported SPLIT into cacheCreation and cacheRead because the claim is about billing, not volume. Summing them would hide the effect under test.",
  "isolation": "deliberately NOT isolated: the session configuration is what the flag is claimed to help with.",
  "arms": "unset (default), 1 (explicit opt-in), 0 (explicit off). unset and 0 should be identical per the shipped gate, which makes 0 a control on the harness."
 },
 "runs": {
  "cold_ladder": [
   {
    "n": 1,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 213154,
    "input": 8,
    "cache_create": 85962,
    "cache_read": 127184,
    "output": 627,
    "cost_usd": 0.78492575,
    "turns": 2,
    "wall": 20.3
   },
   {
    "n": 1,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 340065,
    "input": 12,
    "cache_create": 90493,
    "cache_read": 249560,
    "output": 1043,
    "cost_usd": 0.9016974999999999,
    "turns": 1,
    "wall": 24.7
   },
   {
    "n": 1,
    "arm": "0",
    "env_passed": "0",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 213059,
    "input": 8,
    "cache_create": 85879,
    "cache_read": 127172,
    "output": 561,
    "cost_usd": 0.7824547500000001,
    "turns": 2,
    "wall": 22.7
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 490498,
    "input": 20,
    "cache_create": 207392,
    "cache_read": 283086,
    "output": 1929,
    "cost_usd": 1.6589505000000002,
    "turns": 5,
    "wall": 23.0
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 743088,
    "input": 28,
    "cache_create": 211948,
    "cache_read": 531112,
    "output": 2162,
    "cost_usd": 1.83531475,
    "turns": 1,
    "wall": 29.4
   },
   {
    "n": 4,
    "arm": "0",
    "env_passed": "0",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 490717,
    "input": 20,
    "cache_create": 207730,
    "cache_read": 282967,
    "output": 1825,
    "cost_usd": 1.65964475,
    "turns": 5,
    "wall": 25.6
   },
   {
    "n": 1,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 213243,
    "input": 8,
    "cache_create": 86040,
    "cache_read": 127195,
    "output": 695,
    "cost_usd": 0.7873700000000001,
    "turns": 2,
    "wall": 18.6
   },
   {
    "n": 1,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 272062,
    "input": 10,
    "cache_create": 86826,
    "cache_read": 185226,
    "output": 445,
    "cost_usd": 0.8184292499999999,
    "turns": 1,
    "wall": 18.2
   },
   {
    "n": 1,
    "arm": "0",
    "env_passed": "0",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 213214,
    "input": 8,
    "cache_create": 86184,
    "cache_read": 127022,
    "output": 461,
    "cost_usd": 0.7829335000000001,
    "turns": 2,
    "wall": 33.8
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 491065,
    "input": 20,
    "cache_create": 208085,
    "cache_read": 282960,
    "output": 2206,
    "cost_usd": 1.6726450000000002,
    "turns": 5,
    "wall": 34.4
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 680350,
    "input": 26,
    "cache_create": 212136,
    "cache_read": 468188,
    "output": 2168,
    "cost_usd": 1.8058839999999998,
    "turns": 1,
    "wall": 32.7
   },
   {
    "n": 4,
    "arm": "0",
    "env_passed": "0",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 491267,
    "input": 20,
    "cache_create": 208204,
    "cache_read": 283043,
    "output": 2223,
    "cost_usd": 1.6739715,
    "turns": 5,
    "wall": 27.3
   },
   {
    "n": 1,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 212997,
    "input": 8,
    "cache_create": 91807,
    "cache_read": 121182,
    "output": 547,
    "cost_usd": 0.81611475,
    "turns": 2,
    "wall": 21.8
   },
   {
    "n": 1,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 272560,
    "input": 10,
    "cache_create": 91785,
    "cache_read": 180765,
    "output": 576,
    "cost_usd": 0.85091375,
    "turns": 1,
    "wall": 17.3
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 490805,
    "input": 20,
    "cache_create": 207599,
    "cache_read": 283186,
    "output": 2029,
    "cost_usd": 1.6631955,
    "turns": 5,
    "wall": 24.5
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 675664,
    "input": 26,
    "cache_create": 210227,
    "cache_read": 465411,
    "output": 2145,
    "cost_usd": 1.78908675,
    "turns": 1,
    "wall": 28.5
   },
   {
    "n": 1,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 212415,
    "input": 8,
    "cache_create": 85450,
    "cache_read": 126957,
    "output": 594,
    "cost_usd": 0.7795234999999999,
    "turns": 2,
    "wall": 20.8
   },
   {
    "n": 1,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 1,
    "context_tokens": 271000,
    "input": 10,
    "cache_create": 86326,
    "cache_read": 184664,
    "output": 506,
    "cost_usd": 0.81564825,
    "turns": 1,
    "wall": 18.3
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 489142,
    "input": 20,
    "cache_create": 206405,
    "cache_read": 282717,
    "output": 2293,
    "cost_usd": 1.6619484999999998,
    "turns": 5,
    "wall": 28.9
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "status": "ok",
    "files_created": 4,
    "context_tokens": 675165,
    "input": 26,
    "cache_create": 210015,
    "cache_read": 465124,
    "output": 2019,
    "cost_usd": 1.7839695000000002,
    "turns": 1,
    "wall": 39.7
   }
  ],
  "warm_parent": [
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 539455,
    "context_tokens": 541096,
    "input": 19,
    "cache_create": 238798,
    "cache_read": 302279,
    "output": 1982,
    "cost_usd": 1.9613182500000002,
    "turns": 5,
    "wall": 83.1,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 574215,
    "context_tokens": 892396,
    "input": 25,
    "cache_create": 259102,
    "cache_read": 633269,
    "output": 1894,
    "cost_usd": 2.3336457499999996,
    "turns": 1,
    "wall": 75.5,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 558043,
    "context_tokens": 578339,
    "input": 19,
    "cache_create": 251414,
    "cache_read": 326906,
    "output": 1898,
    "cost_usd": 2.1202667500000003,
    "turns": 5,
    "wall": 86.7,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 471129,
    "context_tokens": 1002498,
    "input": 27,
    "cache_create": 256179,
    "cache_read": 746292,
    "output": 1944,
    "cost_usd": 2.37605475,
    "turns": 1,
    "wall": 77.7,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 616512,
    "context_tokens": 537425,
    "input": 19,
    "cache_create": 236428,
    "cache_read": 300978,
    "output": 1909,
    "cost_usd": 1.939354,
    "turns": 5,
    "wall": 71.4,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 449616,
    "context_tokens": 881828,
    "input": 27,
    "cache_create": 244597,
    "cache_read": 637204,
    "output": 2028,
    "cost_usd": 2.1766582500000005,
    "turns": 1,
    "wall": 87.3,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "unset",
    "env_passed": "<unset>",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 284678,
    "context_tokens": 535226,
    "input": 19,
    "cache_create": 229328,
    "cache_read": 305879,
    "output": 1840,
    "cost_usd": 1.8915944999999998,
    "turns": 5,
    "wall": 64.2,
    "warmth_control_passed": true
   },
   {
    "n": 4,
    "arm": "1",
    "env_passed": "1",
    "filler_kb": 150,
    "status": "ok",
    "files_created": 4,
    "warm_context": 533889,
    "context_tokens": 893152,
    "input": 27,
    "cache_create": 236129,
    "cache_read": 656996,
    "output": 2094,
    "cost_usd": 2.14236675,
    "turns": 1,
    "wall": 110.2,
    "warmth_control_passed": true
   }
  ]
 }
}