diff --git a/client/src/components/ToolsTab.tsx b/client/src/components/ToolsTab.tsx
index ff4044f..82ebdb0 100644
--- a/client/src/components/ToolsTab.tsx
+++ b/client/src/components/ToolsTab.tsx
@@ -16,23 +16,7 @@ import {
 import { AlertCircle, Send } from "lucide-react";
 import { useEffect, useState } from "react";
 import ListPane from "./ListPane";
-
-// Utility function to escape Unicode characters
-function escapeUnicode(obj: any): string {
-  return JSON.stringify(
-    obj,
-    (_key: string, value) => {
-      if (typeof value === "string") {
-        // Replace non-ASCII characters with their Unicode escape sequences
-        return value.replace(/[^\0-\x7F]/g, (char) => {
-          return "\\u" + ("0000" + char.charCodeAt(0).toString(16)).slice(-4);
-        });
-      }
-      return value;
-    },
-    2,
-  );
-}
+import { escapeUnicode } from "@/utils/escapeUnicode";
 
 const ToolsTab = ({
   tools,
diff --git a/client/src/utils/__tests__/escapeUnicode.test.ts b/client/src/utils/__tests__/escapeUnicode.test.ts
new file mode 100644
index 0000000..b2eb130
--- /dev/null
+++ b/client/src/utils/__tests__/escapeUnicode.test.ts
@@ -0,0 +1,27 @@
+import { escapeUnicode } from "../escapeUnicode";
+
+describe("escapeUnicode", () => {
+  it("should escape Unicode characters in a string", () => {
+    const input = { text: "你好世界" };
+    const expected = '{\n  "text": "\\\\u4f60\\\\u597d\\\\u4e16\\\\u754c"\n}';
+    expect(escapeUnicode(input)).toBe(expected);
+  });
+
+  it("should handle empty strings", () => {
+    const input = { text: "" };
+    const expected = '{\n  "text": ""\n}';
+    expect(escapeUnicode(input)).toBe(expected);
+  });
+
+  it("should handle null and undefined values", () => {
+    const input = { text: null, value: undefined };
+    const expected = '{\n  "text": null\n}';
+    expect(escapeUnicode(input)).toBe(expected);
+  });
+
+  it("should handle numbers and booleans", () => {
+    const input = { number: 123, boolean: true };
+    const expected = '{\n  "number": 123,\n  "boolean": true\n}';
+    expect(escapeUnicode(input)).toBe(expected);
+  });
+});
diff --git a/client/src/utils/escapeUnicode.ts b/client/src/utils/escapeUnicode.ts
new file mode 100644
index 0000000..ed6fbd9
--- /dev/null
+++ b/client/src/utils/escapeUnicode.ts
@@ -0,0 +1,16 @@
+// Utility function to escape Unicode characters
+export function escapeUnicode(obj: unknown): string {
+  return JSON.stringify(
+    obj,
+    (_key: string, value) => {
+      if (typeof value === "string") {
+        // Replace non-ASCII characters with their Unicode escape sequences
+        return value.replace(/[^\0-\x7F]/g, (char) => {
+          return "\\u" + ("0000" + char.charCodeAt(0).toString(16)).slice(-4);
+        });
+      }
+      return value;
+    },
+    2,
+  );
+}
diff --git a/package-lock.json b/package-lock.json
index 21c9c30..68929c5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,6 +24,7 @@
         "mcp-inspector": "bin/cli.js"
       },
       "devDependencies": {
+        "@types/jest": "^29.5.14",
         "@types/node": "^22.7.5",
         "@types/shell-quote": "^1.7.5",
         "prettier": "3.3.3"
diff --git a/package.json b/package.json
index 3f40d2e..e3bce92 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "ts-node": "^10.9.2"
   },
   "devDependencies": {
+    "@types/jest": "^29.5.14",
     "@types/node": "^22.7.5",
     "@types/shell-quote": "^1.7.5",
     "prettier": "3.3.3"