diff --git a/src/management/plugin-path-normalizer.ts b/src/management/plugin-path-normalizer.ts
new file mode 100644
index 00000000..92193fd7
--- /dev/null
+++ b/src/management/plugin-path-normalizer.ts
@@ -0,0 +1,81 @@
+import * as os from 'os';
+import * as path from 'path';
+
+function getPluginPathModule(
+  targetConfigDir: string,
+  input: string
+): typeof path.posix | typeof path.win32 {
+  return targetConfigDir.includes('\\') || input.includes('\\') ? path.win32 : path.posix;
+}
+
+function normalizeTargetConfigDir(targetConfigDir: string, input: string): string {
+  const pathModule = getPluginPathModule(targetConfigDir, input);
+  return pathModule.normalize(
+    pathModule === path.win32
+      ? targetConfigDir.replace(/\//g, '\\')
+      : targetConfigDir.replace(/\\/g, '/')
+  );
+}
+
+export function normalizePluginMetadataPathString(
+  input: string,
+  targetConfigDir = path.join(os.homedir(), '.claude')
+): string {
+  const match = input.match(
+    /^(.*?)([\\/])(?:\.claude|\.ccs\2shared|\.ccs\2instances\2[^\\/]+)\2plugins(?:(\2.*))?$/
+  );
+
+  if (!match) {
+    return input;
+  }
+
+  const pathModule = getPluginPathModule(targetConfigDir, input);
+  const normalizedTargetConfigDir = normalizeTargetConfigDir(targetConfigDir, input);
+  const suffix = match[3] ?? '';
+  const suffixSegments = suffix.split(/[\\/]+/).filter(Boolean);
+
+  return pathModule.join(normalizedTargetConfigDir, 'plugins', ...suffixSegments);
+}
+
+export function normalizePluginMetadataValue(
+  value: unknown,
+  targetConfigDir: string
+): { normalized: unknown; changed: boolean } {
+  if (typeof value === 'string') {
+    const normalized = normalizePluginMetadataPathString(value, targetConfigDir);
+    return { normalized, changed: normalized !== value };
+  }
+
+  if (Array.isArray(value)) {
+    let changed = false;
+    const normalized = value.map((item) => {
+      const result = normalizePluginMetadataValue(item, targetConfigDir);
+      changed = changed || result.changed;
+      return result.normalized;
+    });
+    return { normalized, changed };
+  }
+
+  if (value && typeof value === 'object') {
+    let changed = false;
+    const normalized = Object.fromEntries(
+      Object.entries(value as Record<string, unknown>).map(([key, item]) => {
+        const result = normalizePluginMetadataValue(item, targetConfigDir);
+        changed = changed || result.changed;
+        return [key, result.normalized];
+      })
+    );
+    return { normalized, changed };
+  }
+
+  return { normalized: value, changed: false };
+}
+
+export function normalizePluginMetadataContent(
+  original: string,
+  targetConfigDir = path.join(os.homedir(), '.claude')
+): string {
+  const parsed = JSON.parse(original) as unknown;
+  const result = normalizePluginMetadataValue(parsed, targetConfigDir);
+  return result.changed ? JSON.stringify(result.normalized, null, 2) : original;
+}
diff --git a/src/management/shared-manager.ts b/src/management/shared-manager.ts
index 730f1ded..c2f79d2c 100644
--- a/src/management/shared-manager.ts
+++ b/src/management/shared-manager.ts
@@ -14,6 +14,14 @@ import { ok, info, warn } from '../utils/ui';
 import { DEFAULT_ACCOUNT_CONTEXT_GROUP } from '../auth/account-context';
 import type { AccountContextPolicy } from '../auth/account-context';
 import { getCcsDir } from '../utils/config-manager';
+import {
+  normalizePluginMetadataContent,
+  normalizePluginMetadataValue,
+} from './plugin-path-normalizer';
+export {
+  normalizePluginMetadataContent,
+  normalizePluginMetadataPathString,
+} from './plugin-path-normalizer';
 
 interface SharedItem {
   name: string;
@@ -29,85 +37,6 @@ const DEFAULT_INSTALLED_PLUGIN_REGISTRY = JSON.stringify(
   2
 );
 
-function getPluginPathModule(
-  targetConfigDir: string,
-  input: string
-): typeof path.posix | typeof path.win32 {
-  return targetConfigDir.includes('\\') || input.includes('\\') ? path.win32 : path.posix;
-}
-
-function normalizeTargetConfigDir(targetConfigDir: string, input: string): string {
-  const pathModule = getPluginPathModule(targetConfigDir, input);
-  return pathModule.normalize(
-    pathModule === path.win32
-      ? targetConfigDir.replace(/\//g, '\\')
-      : targetConfigDir.replace(/\\/g, '/')
-  );
-}
-
-export function normalizePluginMetadataPathString(
-  input: string,
-  targetConfigDir = path.join(os.homedir(), '.claude')
-): string {
-  const match = input.match(
-    /^(.*?)([\\/])(?:\.claude|\.ccs\2shared|\.ccs\2instances\2[^\\/]+)\2plugins(?:(\2.*))?$/
-  );
-
-  if (!match) {
-    return input;
-  }
-
-  const pathModule = getPluginPathModule(targetConfigDir, input);
-  const normalizedTargetConfigDir = normalizeTargetConfigDir(targetConfigDir, input);
-  const suffix = match[3] ?? '';
-  const suffixSegments = suffix.split(/[\\/]+/).filter(Boolean);
-
-  return pathModule.join(normalizedTargetConfigDir, 'plugins', ...suffixSegments);
-}
-
-function normalizePluginMetadataValue(
-  value: unknown,
-  targetConfigDir: string
-): { normalized: unknown; changed: boolean } {
-  if (typeof value === 'string') {
-    const normalized = normalizePluginMetadataPathString(value, targetConfigDir);
-    return { normalized, changed: normalized !== value };
-  }
-
-  if (Array.isArray(value)) {
-    let changed = false;
-    const normalized = value.map((item) => {
-      const result = normalizePluginMetadataValue(item, targetConfigDir);
-      changed = changed || result.changed;
-      return result.normalized;
-    });
-    return { normalized, changed };
-  }
-
-  if (value && typeof value === 'object') {
-    let changed = false;
-    const normalized = Object.fromEntries(
-      Object.entries(value as Record<string, unknown>).map(([key, item]) => {
-        const result = normalizePluginMetadataValue(item, targetConfigDir);
-        changed = changed || result.changed;
-        return [key, result.normalized];
-      })
-    );
-    return { normalized, changed };
-  }
-
-  return { normalized: value, changed: false };
-}
-
-export function normalizePluginMetadataContent(
-  original: string,
-  targetConfigDir = path.join(os.homedir(), '.claude')
-): string {
-  const parsed = JSON.parse(original) as unknown;
-  const result = normalizePluginMetadataValue(parsed, targetConfigDir);
-  return result.changed ? JSON.stringify(result.normalized, null, 2) : original;
-}
-
 /**
  * SharedManager Class
  */
diff --git a/tests/unit/shared-manager.test.ts b/tests/unit/shared-manager.test.ts
index 730d2f57..063ae9a4 100644
--- a/tests/unit/shared-manager.test.ts
+++ b/tests/unit/shared-manager.test.ts
@@ -2,9 +2,13 @@ import { afterEach, beforeEach, describe, expect, it, mock, spyOn } from 'bun:te
 import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
-import SharedManager, {
+import {
   normalizePluginMetadataContent,
   normalizePluginMetadataPathString,
+} from '../../src/management/plugin-path-normalizer';
+import SharedManager, {
+  normalizePluginMetadataContent as normalizeSharedManagerPluginMetadataContent,
+  normalizePluginMetadataPathString as normalizeSharedManagerPluginMetadataPathString,
 } from '../../src/management/shared-manager';
 
 describe('SharedManager', () => {
@@ -144,6 +148,12 @@ describe('SharedManager', () => {
       expect(normalizePluginMetadataPathString(input, targetConfigDir)).toBe(input);
     });
 
+    it('preserves original JSON content when no plugin path changes are needed', () => {
+      const original = JSON.stringify({ plugins: { 'plugin-a': { enabled: true } } }, null, 4);
+
+      expect(normalizePluginMetadataContent(original, instanceDir('work'))).toBe(original);
+    });
+
     it('handles Windows path separators', () => {
       const targetConfigDir = 'C:\\Users\\user\\.claude';
       const input = 'C:\\Users\\user\\.ccs\\instances\\work\\plugins\\marketplaces\\official';
@@ -152,6 +162,27 @@ describe('SharedManager', () => {
         'C:\\Users\\user\\.claude\\plugins\\marketplaces\\official'
       );
     });
+
+    it('uses the current home directory when target config dir is omitted', () => {
+      const input = path.join(tempRoot, '.ccs', 'shared', 'plugins', 'cache', 'plugin-a');
+
+      expect(normalizePluginMetadataPathString(input)).toBe(
+        path.join(tempRoot, '.claude', 'plugins', 'cache', 'plugin-a')
+      );
+    });
+
+    it('keeps the legacy shared-manager helper export compatible', () => {
+      const targetConfigDir = instanceDir('work');
+      const input = path.join(tempRoot, '.ccs', 'shared', 'plugins', 'cache', 'plugin-a');
+      const content = JSON.stringify({ installPath: input }, null, 2);
+
+      expect(normalizeSharedManagerPluginMetadataPathString(input, targetConfigDir)).toBe(
+        normalizePluginMetadataPathString(input, targetConfigDir)
+      );
+      expect(normalizeSharedManagerPluginMetadataContent(content, targetConfigDir)).toBe(
+        normalizePluginMetadataContent(content, targetConfigDir)
+      );
+    });
   });
 
   describe('shared symlink lifecycle', () => {