diff --git a/extensions/memory-core/index.test.ts b/extensions/memory-core/index.test.ts
new file mode 100644
index 00000000000..8c81f52fc05
--- /dev/null
+++ b/extensions/memory-core/index.test.ts
@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+import { buildPromptSection } from "./index.js";
+
+describe("buildPromptSection", () => {
+  it("returns empty when no memory tools are available", () => {
+    expect(buildPromptSection({ availableTools: new Set() })).toEqual([]);
+  });
+
+  it("returns Memory Recall section when memory_search is available", () => {
+    const result = buildPromptSection({ availableTools: new Set(["memory_search"]) });
+    expect(result[0]).toBe("## Memory Recall");
+    expect(result).toContain(
+      "Citations: include Source: <path#line> when it helps the user verify memory snippets.",
+    );
+    expect(result.at(-1)).toBe("");
+  });
+
+  it("returns Memory Recall section when memory_get is available", () => {
+    const result = buildPromptSection({ availableTools: new Set(["memory_get"]) });
+    expect(result[0]).toBe("## Memory Recall");
+  });
+
+  it("includes citations-off instruction when citationsMode is off", () => {
+    const result = buildPromptSection({
+      availableTools: new Set(["memory_search"]),
+      citationsMode: "off",
+    });
+    expect(result).toContain(
+      "Citations are disabled: do not mention file paths or line numbers in replies unless the user explicitly asks.",
+    );
+  });
+});
diff --git a/extensions/memory-core/index.ts b/extensions/memory-core/index.ts
index e176ea619fe..c163f34e1a1 100644
--- a/extensions/memory-core/index.ts
+++ b/extensions/memory-core/index.ts
@@ -1,7 +1,10 @@
 import { definePluginEntry } from "openclaw/plugin-sdk/core";
 import type { MemoryPromptSectionBuilder } from "openclaw/plugin-sdk/memory-core";
 
-const buildPromptSection: MemoryPromptSectionBuilder = ({ availableTools, citationsMode }) => {
+export const buildPromptSection: MemoryPromptSectionBuilder = ({
+  availableTools,
+  citationsMode,
+}) => {
   if (!availableTools.has("memory_search") && !availableTools.has("memory_get")) {
     return [];
   }