diff --git a/src/settings.ts b/src/settings.ts
index a186c72..5c0c768 100644
--- a/src/settings.ts
+++ b/src/settings.ts
@@ -135,3 +135,37 @@ export function mergeSkillReinjectIntoSettingsFile(
 export function writeGlobalSettings(partial: PartialSkillReinjectSettings): void {
 	mergeSkillReinjectIntoSettingsFile(join(getAgentDir(), "settings.json"), partial);
 }
+
+/** Resolved re-inject delivery mode after integration settings (SPEC §6.5.3). */
+export type ReinjectDeliveryMode = "defer" | "immediate";
+
+/** Session override wins over global enabled default (SPEC §5.1). */
+export function effectiveEnabled(
+	sessionOverride: boolean | null,
+	settings: SkillReinjectSettings,
+): boolean {
+	return sessionOverride ?? settings.enabled;
+}
+
+/** Resolve delivery mode from integration setting, pi-auto-compact detect, and triggerTurn (SPEC §6.5.3). */
+export function effectiveIntegration(
+	settings: SkillReinjectSettings,
+	autoCompactDetected: boolean,
+	sessionIntegrationOverride?: AutoCompactIntegration | null,
+): ReinjectDeliveryMode {
+	const integration = sessionIntegrationOverride ?? settings.autoCompactIntegration;
+	switch (integration) {
+		case "defer":
+			return "defer";
+		case "immediate":
+			return "immediate";
+		case "off":
+			return settings.triggerTurn ? "immediate" : "defer";
+		case "auto":
+		default:
+			if (autoCompactDetected) {
+				return "defer";
+			}
+			return settings.triggerTurn ? "immediate" : "defer";
+	}
+}