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subagent-driven-development mandated implementer + two-stage review + final reviewer unconditionally — agy and opencode each dispatched 4 subagents for a one-line console.log in the 2026-06-09 quorum sweep (cost-trivial-task-review-fanout), and the agents that passed did so only by disobeying the skill. - Proportionality rule: when the entire plan is one trivial, fully-specified mechanical change, implement directly, verify, commit — no review fanout. "When in doubt, it is not trivial." Within a multi-task plan the full pipeline still applies to every task regardless of size. - Flowchart gets the trivial-exit diamond (the failing agents follow the flowchart literally; prose alone would not redirect them). - Red Flags "never skip reviews" amended to reference the exception so the skill does not contradict itself. TDD evidence (quorum): - RED: agy 025324Z + opencode batches — 4 dispatches for 1 line - GREEN: cost-trivial-task-review-fanout-opencode-20260610T002518Z-f3f5 pass — 0 dispatches, $0.04, change landed on main checkout - Canary: sdd-rejects-extra-features-claude-20260610T002901Z-458a pass — multi-task plan still runs implementer + two-stage review per task (tool-called Agent ✓, spec reviewer as YAGNI gate after each task) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>