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The Understand-Deep 150 protocol is a specialized research framework designed to prevent shallow problem-solving. It mandates a dual-source approach, requiring Claude to analyze internal data (codebase, Git history, logs, and config) alongside external intelligence (official documentation, web searches, and community best practices). By applying the 150% Research Rule, the skill ensures that primary findings are always cross-validated against the 'other world' of information, resulting in highly accurate architectural decisions, bug resolutions, and library evaluations complete with evidence quality levels and confidence scores.