{ "measurement": "Does fanning out to parallel subagents save wall clock on genuinely independent, heavy-context work", "claude_code_version": "2.1.229 (Claude Code)", "claim_under_test": "From circulating subagent guides: \"Parallel execution cuts task completion time by 40-60% compared to sequential prompting\", with three to five concurrent subagents named as the sweet spot for most jobs.", "two_earlier_attempts_were_discarded": "This is the third build. The first two were thrown away over the same unresolved question: whether the non-Agent tool calls appearing in the parent's stream were the PARENT doing the work itself or SUBAGENTS doing what they were told. Attempt 1 was read as parent contamination and discarded. Attempt 2 added a delegation control that turned out to be blind to Read, because it tested a string truncated to 120 characters and a Read path's filename sits past that. Neither attempt could tell the two apart, so neither was published. The field that settles it is parent_tool_use_id, carried on every assistant and user message: null means the message came from the main conversation, a non-null value is the tool_use id of the Agent call whose subagent produced it. It is documented, under 'Follow subagent messages' at https://code.claude.com/docs/en/headless and 'Detect subagent invocation' at https://code.claude.com/docs/en/agent-sdk/subagents; two corpora were built without reading it. Attempt 1 cannot be re-scored, because it was recorded without the field. What can be said is that its shape, exactly N non-Agent calls in a Read/Bash mix across all 8 fan-out runs, matches the subagent signature this corpus attributes directly, so the contamination reading was probably wrong.", "method": { "work": "N files of about 40KB each, one distinct planted AUDIT MARKER per file. Report every marker. Independent per file, heavy enough that handling one is real work rather than spawn overhead.", "arms": "fanout dispatches N subagents, one per file, and is told not to inspect any file itself. inline forbids subagents. Both get the same fixture in the same round.", "metric": "WALL CLOCK, because the claim is about time. Tokens and dollars recorded alongside.", "controls": { "delegation_by_attribution": "Every tool call is attributed via parent_tool_use_id and published with a by field of parent or subagent. In the fan-out arm the PARENT must make zero fixture operations; a subagent reading its one file is the experiment working, not contamination. Result: 0 parent touches in all 12 fan-out runs, and exactly N in all 12 inline runs, which is the positive half of the same control. The matcher was control-tested before the runs against a synthetic parent Read with a long path, a subagent Read, a parent grep and a subagent grep, and fires on exactly the first and third.", "arrival": "Every planted marker must appear in the reply, exact string. 24 of 24.", "fixture": "File count and total KB measured on disk per run.", "order_alternation": "Arms run back to back inside a round and the running order alternates by round; order_in_round published per run.", "isolation": "--setting-sources project on every call, asserted onto the command line.", "no_exclusions": "Every run in this corpus is scored. Nothing was dropped, unlike attempt 2." }, "known_limits": { "cost_mechanism_not_established": "Fan-out is slightly cheaper at both widths, 0.92x and 0.97x, and the arms do not overlap, but the margins are small and the CAUSE is not measured. Dollars per million context tokens differ between the arms, which points at the token mix rather than the model: a separate probe found both arms overwhelmingly on Opus, with Haiku a sub-1000-token sliver in each, so a cheap-model explanation is NOT supported. This corpus sums context without splitting fresh input, cache creation and cache read, so it cannot settle the mechanism and does not try.", "unit_size_is_the_open_variable": "Each unit is a 40KB file search finishing in about a second. An earlier corpus used four-byte units and also found fan-out slower. Somewhere above this parallelism must win; nothing here locates that crossover. A unit blocking for minutes on something that is not the model is untested and is a different case.", "one_machine": "Wall clock is a property of this machine under this load. The ratio transfers, the seconds do not.", "attempt_1_cannot_be_re_attributed": "The narrative that attempt 1's apparent contamination was subagents working correctly is an INFERENCE from a matching tool-call signature, not a re-scoring. That corpus predates the attribution field and carries no parent_tool_use_id, so it cannot be attributed now." }, "redaction": "Replies and tool-call arguments have every path-shaped token reduced to its basename or to . No measured value is altered." }, "results": { "n4": { "runs_per_arm": 6, "wall_fanout": 20.015, "wall_inline": 11.665, "wall_ratio": 1.716, "wall_margin_seconds": 3.96, "wall_overlap": false, "tokens_fanout": 165635.5, "tokens_inline": 91055.5, "tokens_ratio": 1.819, "tokens_overlap": false, "cost_fanout": 0.5131, "cost_inline": 0.5597, "cost_ratio": 0.917, "cost_overlap": false, "dollars_per_million_context_fanout": 3.1, "dollars_per_million_context_inline": 6.15 }, "n8": { "runs_per_arm": 6, "wall_fanout": 29.58, "wall_inline": 16.759999999999998, "wall_ratio": 1.765, "wall_margin_seconds": 7.19, "wall_overlap": false, "tokens_fanout": 297944.5, "tokens_inline": 137610.0, "tokens_ratio": 2.165, "tokens_overlap": false, "cost_fanout": 1.0098, "cost_inline": 1.0395, "cost_ratio": 0.971, "cost_overlap": false, "dollars_per_million_context_fanout": 3.39, "dollars_per_million_context_inline": 7.55 }, "runs": 24, "markers": "24 of 24 runs found every marker", "parent_touches_fanout": "0 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"Read", "arg": "scratchp", "basename": "report-2.txt", "arg_len": 153, "parent_tool_use_id": "toolu_01VwPfVdUJsreJFyQHUdDHNJ", "by": "subagent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-3.txt", "arg_len": 153, "parent_tool_use_id": "toolu_01CdJ1WrwaVM1zmfm999Y6kh", "by": "subagent" }, { "tool": "Bash", "arg": "grep -n \"AUDIT MARKER:\" \"4e54e48b-0947-4f89-9", "basename": "report-4.txt\"", "arg_len": 179, "parent_tool_use_id": "toolu_013teFCaGzuX3ayS66SRs6bN", "by": "subagent" } ], "n_tool_calls": 8, "read_tool_uses": 2, "parent_calls": 4, "subagent_calls": 4, "grep_or_search": 2, "reply": "ZQX-1000-505120\nZQX-1001-845787\nZQX-1002-479900\nZQX-1003-836469" }, { "arm": "inline", "n": 4, "round": 0, "order_in_round": 1, "parent_fixture_touches": 4, "delegation_ok": true, "status": "ok", "markers_expected": 4, "markers_found": 4, "fixture_files": 4, "fixture_kb": 160.4, "wall": 10.88, "context": 91054, "turns": 5, "cost": 0.5596065, "tool_calls": [ { "tool": "Read", "arg": "scratchp", "basename": "report-1.txt", "arg_len": 153, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-2.txt", "arg_len": 153, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-3.txt", "arg_len": 153, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-4.txt", "arg_len": 153, "parent_tool_use_id": null, "by": "parent" } ], "n_tool_calls": 4, "read_tool_uses": 4, "parent_calls": 4, "subagent_calls": 0, "grep_or_search": 0, "reply": "ZQX-1000-439392\nZQX-1001-296771\nZQX-1002-244433\nZQX-1003-453192" }, { "arm": "fanout", "n": 8, "round": 0, "order_in_round": 0, "parent_fixture_touches": 0, "delegation_ok": true, "status": "ok", "markers_expected": 8, "markers_found": 8, "fixture_files": 8, "fixture_kb": 320.7, "wall": 29.25, "context": 275022, "turns": 9, "cost": 0.86816775, "tool_calls": [ { "tool": "Agent", "arg": "", 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"tool": "Read", "arg": "scratchp", "basename": "report-8.txt", "arg_len": 153, "parent_tool_use_id": "toolu_013BSZUVQXzzzum4TJkUaZke", "by": "subagent" } ], "n_tool_calls": 16, "read_tool_uses": 6, "parent_calls": 8, "subagent_calls": 8, "grep_or_search": 2, "reply": "AUDIT MARKER: ZQX-1000-583924\nAUDIT MARKER: ZQX-1001-269848\nAUDIT MARKER: ZQX-1002-161857\nAUDIT MARKER: ZQX-1003-320713\nAUDIT MARKER: ZQX-1004-463296\nAUDIT MARKER: ZQX-1005-290770\nAUDIT MARKER: ZQX-1006-656630\nAUDIT MARKER: ZQX-1007-963926" }, { "arm": "inline", "n": 8, "round": 0, "order_in_round": 1, "parent_fixture_touches": 8, "delegation_ok": true, "status": "ok", "markers_expected": 8, "markers_found": 8, "fixture_files": 8, "fixture_kb": 320.7, "wall": 16.7, "context": 137610, "turns": 9, "cost": 1.0394665, "tool_calls": [ { "tool": "Read", "arg": "scratchp", "basename": "report-1.txt", "arg_len": 153, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": 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"parent_tool_use_id": null, "by": "parent" }, { "tool": "Agent", "arg": "", "basename": "", "arg_len": 0, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-2.txt", "arg_len": 153, "parent_tool_use_id": "toolu_01PGAJm64tXBHWADLBGTxnuC", "by": "subagent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-3.txt", "arg_len": 153, "parent_tool_use_id": "toolu_017Rvmrx5Yt3ySbRw9etcVg5", "by": "subagent" }, { "tool": "Agent", "arg": "", "basename": "", "arg_len": 0, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-4.txt", "arg_len": 153, "parent_tool_use_id": "toolu_01B8KGD4gxAWgD9q3DUPEVTZ", "by": "subagent" }, { "tool": "Agent", "arg": "", "basename": "", "arg_len": 0, "parent_tool_use_id": null, "by": "parent" }, { "tool": "Read", "arg": "scratchp", "basename": "report-5.txt", "arg_len": 153, "parent_tool_use_id": "toolu_013n98bUnHUDujChsZQhK8yp", "by": "subagent" }, { 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