diff --git a/src/kept.ts b/src/kept.ts
index 6855872..be72a9f 100644
--- a/src/kept.ts
+++ b/src/kept.ts
@@ -56,17 +56,27 @@ export function skillsPresentInKeptWindow(
 	return present;
 }
 
+/** Tracked skills absent from kept window — defer planning stage without registry filter (Phase 14 / B-002). */
+export function filterSkillsNeedingReinjectByKept(
+	tracked: readonly TrackedSkill[],
+	keptPresent: ReadonlySet<string>,
+): string[] {
+	const needing: string[] = [];
+	for (const skill of tracked) {
+		if (!keptPresent.has(skill.name)) {
+			needing.push(skill.name);
+		}
+	}
+	return needing;
+}
+
 /** Tracked skills missing from kept window but still registered (SPEC §5.2, §6.4). */
 export function filterSkillsNeedingReinject(
 	tracked: readonly TrackedSkill[],
 	keptPresent: ReadonlySet<string>,
 	registeredNames: ReadonlySet<string>,
 ): string[] {
-	const needing: string[] = [];
-	for (const skill of tracked) {
-		if (registeredNames.has(skill.name) && !keptPresent.has(skill.name)) {
-			needing.push(skill.name);
-		}
-	}
-	return needing;
+	return filterSkillsNeedingReinjectByKept(tracked, keptPresent).filter((name) =>
+		registeredNames.has(name),
+	);
 }
diff --git a/test/kept-window.test.ts b/test/kept-window.test.ts
index 72633dd..431e05b 100644
--- a/test/kept-window.test.ts
+++ b/test/kept-window.test.ts
@@ -2,6 +2,7 @@ import type { SessionEntry } from "@earendil-works/pi-coding-agent";
 import { describe, expect, it } from "vitest";
 import {
 	filterSkillsNeedingReinject,
+	filterSkillsNeedingReinjectByKept,
 	getKeptEntries,
 	skillsPresentInKeptWindow,
 } from "../src/kept";
@@ -95,6 +96,23 @@ describe("skillsPresentInKeptWindow", () => {
 	});
 });
 
+describe("filterSkillsNeedingReinjectByKept", () => {
+	it("returns tracked skills absent from kept window regardless of registration", () => {
+		const keptPresent = new Set(["alpha"]);
+		expect(filterSkillsNeedingReinjectByKept(trackedSkills, keptPresent)).toEqual(["beta"]);
+	});
+
+	it("preserves tracked order including unregistered names", () => {
+		const keptPresent = new Set<string>();
+		expect(filterSkillsNeedingReinjectByKept(trackedSkills, keptPresent)).toEqual(["alpha", "beta"]);
+	});
+
+	it("returns empty when all tracked skills are in kept window", () => {
+		const keptPresent = new Set(["alpha", "beta"]);
+		expect(filterSkillsNeedingReinjectByKept(trackedSkills, keptPresent)).toEqual([]);
+	});
+});
+
 describe("filterSkillsNeedingReinject", () => {
 	it("returns registered tracked skills absent from kept window", () => {
 		const keptPresent = new Set(["alpha"]);