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The APEX Plan skill serves as the dedicated architecture engine for the APEX framework, converting research findings into high-integrity technical designs. It enforces a mandatory 'Architect' phase that produces five specific design artifacts—including a Design Rationale, a triple-option Tree of Thought, and a YAGNI declaration—to ensure every implementation is skeptical of complexity and backed by codebase-specific evidence. This skill is essential for developers who need to maintain strict system integrity, avoid scope creep, and evaluate multiple architectural approaches before writing a single line of production code.