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diff --git a/engine/traits/dark-triad.ts b/engine/traits/dark-triad.ts
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+/**
+ * Dark Triad profile, each 0–100. Distribution is skewed low — most
+ * characters sit in the 20–40 range; a small minority above 60 drives
+ * specific life shapes (docs/04-traits.md §"Dark Triad characters in play").
+ */
+export interface DarkTriadProfile {
+  readonly narcissism: number
+  readonly machiavellianism: number
+  readonly psychopathy: number
+}