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Guide for using TB2J command-line tools to calculate magnetic interaction parameters (J, DMI, etc.) from DFT outputs (Wannier90, Siesta, Abacus). Use this skill when the user asks about running TB2J commands, their parameters, inputs, or outputs.

Spec-driven knowledge management with BMAD-method workflow. Atomic notes, quick tasks, optional research, PRD→Architecture→Epics→Stories, TDD implementation, mandatory code review.