Systematically reproduces, hypothesizes, tests, plans, fixes, and verifies bugs from a user bug description. Use when the user reports a bug, regression, unexpected behavior, crash, or asks to debug, reproduce, root-cause, or fix an issue. Prefer local dev server and browser verification over code-only guesses.
Produces an unusually strict implementation plan focused on structural simplicity, minimal moving parts, and maintainable execution. Use for a thermo-nuclear plan, plan quality audit, strict planning review, deep implementation plan, or when the user wants an ambitious plan that avoids complexity.