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SDD Plan-First Development (sdd-plan) is a specialized Claude Code skill designed to enforce a rigorous 'plan-before-code' workflow, preventing context drift and ensuring architectural integrity in complex software projects. By leveraging the foundry-mcp, it analyzes existing codebases to produce detailed JSON specifications complete with task hierarchies, repo-relative file paths, and automated verification steps. This skill is essential for developers tackling large-scale refactors, new feature additions, or cross-file changes where precision and pre-implementation AI-powered reviews are critical for maintaining production-ready code quality.