Lean ~30-line body with organized sections; it does not over-explain concepts Claude already knows and every section earns its place. The Overview lightly restates the description but stays brief.

As an instruction-only strategy skill it gives concrete, specific guidance ('Issue an imperial order allowing lords to divide territories among ALL sons', 'Each son receives a portion as a marquisate'), which the rubric accepts in lieu of code.

Four clearly sequenced numbered steps plus a dedicated Verification section with checkpoints; for a non-destructive single-purpose skill this satisfies the simple-skills allowance and the validation expectation.

A single self-contained file under 50 lines with well-organized sections (Overview, Steps, Expected Outcomes, Verification) and no bundle files needed, matching the simple-skills allowance for a top score.

Names concrete actions within its domain — 'divide territories among all heirs' and 'progressively fragmenting large fiefs into minor holdings' — rather than vague abstractions.

Explicitly answers both 'what' ('Implements the Tui'en decree to divide territories among all heirs') and 'when' ('Use when weakening powerful feudal lords without military confrontation').

Uses natural terms a user would say ('weakening powerful feudal lords without military confrontation', 'territories', 'heirs', 'fiefs') with good coverage for this niche.

Highly specific historical-political niche with distinct triggers; very unlikely to fire for an unrelated skill.