fix(shared-manager): allow external claude symlink chains

src/management/shared-manager.ts

@@ -149,7 +149,7 @@ class SharedManager {
   /**
    * Detect circular symlink before creation
    */
-  private detectCircularSymlink(target: string, linkPath: string): boolean {
+  private detectCircularSymlink(target: string): boolean {
     // Check if target exists and is symlink
     if (!fs.existsSync(target)) {
       return false;
@@ -165,15 +165,13 @@ class SharedManager {
       const targetLink = fs.readlinkSync(target);
       const resolvedTarget = path.resolve(path.dirname(target), targetLink);
 
-      // Check if target points back to our shared dir or link path
+      // Only treat targets inside the managed shared root as circular.
+      // Existing shared symlinks may already resolve through ~/.claude/ to an
+      // external repo, which is a supported upgrade path rather than a loop.
       const sharedDir = this.resolveCanonicalPath(path.join(getCcsDir(), 'shared'));
       const canonicalResolvedTarget = this.resolveCanonicalPath(resolvedTarget);
-      const canonicalLinkPath = this.resolveCanonicalPath(linkPath);
 
-      if (
-        this.isPathWithinDirectory(canonicalResolvedTarget, sharedDir) ||
-        canonicalResolvedTarget === canonicalLinkPath
-      ) {
+      if (this.isPathWithinDirectory(canonicalResolvedTarget, sharedDir)) {
         console.log(warn(`Circular symlink detected: ${target} → ${resolvedTarget}`));
         return true;
       }
@@ -219,7 +217,7 @@ class SharedManager {
       }
 
       // Check for circular symlink
-      if (this.detectCircularSymlink(claudePath, sharedPath)) {
+      if (this.detectCircularSymlink(claudePath)) {
         console.log(warn(`Skipping ${item.name}: circular symlink detected`));
         continue;
       }

tests/unit/shared-manager.test.ts

@@ -154,6 +154,71 @@ describe('SharedManager', () => {
     });
   });
 
+  describe('shared symlink lifecycle', () => {
+    it('preserves external ~/.claude symlinks during upgrade reconciliation', () => {
+      const manager = new SharedManager();
+      const externalCommandsDir = path.join(tempRoot, 'Documents', 'claude-config', 'commands');
+      const externalSettingsPath = path.join(
+        tempRoot,
+        'Documents',
+        'claude-config',
+        'settings.json'
+      );
+      const claudeCommandsPath = path.join(claudeDir(), 'commands');
+      const claudeSettingsPath = path.join(claudeDir(), 'settings.json');
+      const sharedCommandsPath = path.join(ccsDir(), 'shared', 'commands');
+      const sharedSettingsPath = path.join(ccsDir(), 'shared', 'settings.json');
+      const logSpy = spyOn(console, 'log').mockImplementation(() => {});
+
+      fs.mkdirSync(externalCommandsDir, { recursive: true });
+      fs.mkdirSync(path.dirname(externalSettingsPath), { recursive: true });
+      fs.mkdirSync(claudeDir(), { recursive: true });
+      fs.mkdirSync(path.join(ccsDir(), 'shared'), { recursive: true });
+      fs.writeFileSync(externalSettingsPath, JSON.stringify({ theme: 'dark' }), 'utf8');
+      fs.symlinkSync(externalCommandsDir, claudeCommandsPath, 'dir');
+      fs.symlinkSync(externalSettingsPath, claudeSettingsPath, 'file');
+      fs.symlinkSync(claudeCommandsPath, sharedCommandsPath, 'dir');
+      fs.symlinkSync(claudeSettingsPath, sharedSettingsPath, 'file');
+
+      manager.ensureSharedDirectories();
+
+      expect(
+        logSpy.mock.calls.some(([message]) =>
+          String(message).includes('Skipping commands: circular symlink detected') ||
+          String(message).includes('Skipping settings.json: circular symlink detected')
+        )
+      ).toBe(false);
+      expect(fs.lstatSync(sharedCommandsPath).isSymbolicLink()).toBe(true);
+      expect(
+        path.resolve(path.dirname(sharedCommandsPath), fs.readlinkSync(sharedCommandsPath))
+      ).toBe(claudeCommandsPath);
+      expect(fs.lstatSync(sharedSettingsPath).isSymbolicLink()).toBe(true);
+      expect(
+        path.resolve(path.dirname(sharedSettingsPath), fs.readlinkSync(sharedSettingsPath))
+      ).toBe(claudeSettingsPath);
+    });
+
+    it('still blocks real circular links back into ~/.ccs/shared', () => {
+      const manager = new SharedManager();
+      const claudeCommandsPath = path.join(claudeDir(), 'commands');
+      const sharedCommandsPath = path.join(ccsDir(), 'shared', 'commands');
+      const logSpy = spyOn(console, 'log').mockImplementation(() => {});
+
+      fs.mkdirSync(claudeDir(), { recursive: true });
+      fs.mkdirSync(sharedCommandsPath, { recursive: true });
+      fs.symlinkSync(sharedCommandsPath, claudeCommandsPath, 'dir');
+
+      manager.ensureSharedDirectories();
+
+      expect(
+        logSpy.mock.calls.some(([message]) =>
+          String(message).includes('Skipping commands: circular symlink detected')
+        )
+      ).toBe(true);
+      expect(fs.lstatSync(sharedCommandsPath).isDirectory()).toBe(true);
+    });
+  });
+
   describe('marketplace registry ownership', () => {
     it('writes global and instance registries with different authoritative install locations', () => {
       const globalRegistryPath = path.join(claudeDir(), 'plugins', 'known_marketplaces.json');