This skill should be used when the user asks to "plan specification layers", "set up project layers", "define spec structure", "organize requirements and design", "UC to implementation", "specification process", "layer model", "continue" or "resume" (when docs/state.toml exists). Diamond-topology specification model for taking a project from use cases to working implementation with bidirectional signal propagation and alignment guarantees. NOT for single-file changes, NOT for quick fixes with known files/lines, NOT for research-only tasks.
2026-03-07