Table of contents TheColliery Benchmarks CoalBoard—with-the-board vs without-the-board Results CoalFace—fan-out cost Results CoalHearth—interruption damage Results CoalLedger—doc-rot + doc-leak corpus Results CoalMine—canary detection Results CoalTipple—routing savings Results Routing savings CoalWash—memory wash fidelity Results Governance—the always-loaded cost Results SkillDeterminism Results Patterns Design Principles Public-Doc Pattern Skill-Repo Pattern Release Pattern Sweep Marks New-Repo Wizard Installing Coal* skills on claude.ai