ISUCON 2026: human-off-the-loop failed
ISUCON2026参加記: ヒューマン・オフ・ザ・ループ失敗
English summary
Two-person team ran 4 agent sessions (Claude Code x3, Codex x1) in merge/investigate/fix roles after 5 rehearsals encoded as skills; 129 issues (25 rejected), 102 PRs (86 merged), about 77 benches, about 130 commits; 3 hours flat at 23-25k because agents kept polishing SQL while the ceiling was architectural; moving heavy work to another server took it to 42k. Measured case of agents optimising locally without a human reframing.
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