diff --git a/tools/installer/lib/installer.js b/tools/installer/lib/installer.js
index d04830d7..f89ddf3f 100644
--- a/tools/installer/lib/installer.js
+++ b/tools/installer/lib/installer.js
@@ -1987,6 +1987,118 @@ class Installer {
     return null;
   }
 
+  async updateManifestOnly(config) {
+    const spinner = ora('Updating manifest files...').start();
+
+    try {
+      // Store the original CWD where npx was executed
+      const originalCwd = process.env.INIT_CWD || process.env.PWD || process.cwd();
+
+      // Resolve installation directory relative to where the user ran the command
+      let installDir = path.isAbsolute(config.directory)
+        ? config.directory
+        : path.resolve(originalCwd, config.directory);
+
+      if (path.basename(installDir) === '.bmad-core') {
+        // If user points directly to .bmad-core, treat its parent as the project root
+        installDir = path.dirname(installDir);
+      }
+
+      const bmadCoreDir = path.join(installDir, '.bmad-core');
+
+      // Verify .bmad-core exists
+      if (!(await fileManager.pathExists(bmadCoreDir))) {
+        spinner.fail('No .bmad-core directory found in specified location');
+        console.log(`\nPlease run regular installation first at: ${installDir}`);
+        process.exit(1);
+      }
+
+      const manifestPath = path.join(bmadCoreDir, 'install-manifest.yaml');
+
+      // Verify install-manifest.yaml exists
+      if (!(await fileManager.pathExists(manifestPath))) {
+        spinner.fail('No install-manifest.yaml found in .bmad-core');
+        console.log('\nPlease run regular installation first to create manifest.');
+        process.exit(1);
+      }
+
+      spinner.text = 'Reading existing manifest...';
+
+      // Read existing manifest to preserve metadata
+      const existingManifest = await fileManager.readYamlFile(manifestPath);
+      const coreVersion = await this.getCoreVersion();
+      const timestamp = new Date().toISOString();
+
+      spinner.text = 'Scanning core installation files...';
+
+      // Scan core agents and data files
+      const resourceLocatorInstance = await resourceLocator.createResourceLocator(installDir);
+      const coreFiles = await resourceLocatorInstance.scanCoreResources();
+
+      // Generate manifest with updated file information
+      const updatedManifest = {
+        version: coreVersion,
+        timestamp,
+        installedAt: existingManifest.installedAt || timestamp,
+        lastUpdated: timestamp,
+        core: {
+          agents: coreFiles.agents || [],
+          data: coreFiles.data || [],
+          files: coreFiles.files || [],
+        },
+        expansions: existingManifest.expansions || [],
+      };
+
+      // Update manifest file
+      spinner.text = 'Writing updated manifest...';
+      await fileManager.writeYamlFile(manifestPath, updatedManifest);
+
+      // Update expansion pack manifests if they exist
+      const expansionsPath = path.join(installDir, 'expansions');
+      if (await fileManager.pathExists(expansionsPath)) {
+        spinner.text = 'Updating expansion pack manifests...';
+
+        const glob = require('glob');
+        const expansionDirs = glob.sync('*/', {
+          cwd: expansionsPath,
+          absolute: true,
+        });
+
+        for (const expansionDir of expansionDirs) {
+          const packManifestPath = path.join(expansionDir, 'manifest.yaml');
+          if (await fileManager.pathExists(packManifestPath)) {
+            try {
+              const packManifest = await fileManager.readYamlFile(packManifestPath);
+              packManifest.lastUpdated = timestamp;
+              packManifest.coreVersion = coreVersion;
+              await fileManager.writeYamlFile(packManifestPath, packManifest);
+            } catch {
+              // Continue if individual expansion manifest fails
+            }
+          }
+        }
+      }
+
+      spinner.succeed('Manifest files updated successfully!');
+
+      // Display summary
+      console.log(chalk.bold('\n✓ Installation Summary'));
+      console.log(chalk.dim('─'.repeat(50)));
+      console.log(`  ${chalk.cyan('Core Version:')} ${coreVersion}`);
+      console.log(`  ${chalk.cyan('Installation Dir:')} ${installDir}`);
+      console.log(`  ${chalk.cyan('Updated:')} ${timestamp}`);
+      console.log(`  ${chalk.cyan('Core Agents:')} ${updatedManifest.core.agents?.length || 0}`);
+      console.log(`  ${chalk.cyan('Data Files:')} ${updatedManifest.core.data?.length || 0}`);
+      console.log(`  ${chalk.cyan('Total Files:')} ${updatedManifest.core.files?.length || 0}`);
+      console.log(chalk.dim('─'.repeat(50)));
+      console.log(chalk.green('\n✓ Manifest update complete!'));
+    } catch (error) {
+      spinner.fail(`Failed to update manifest: ${error.message}`);
+      console.error('Error details:', error);
+      process.exit(1);
+    }
+  }
+
   async flatten(options) {
     const { spawn } = require('node:child_process');
     const flattenerPath = path.join(__dirname, '..', '..', 'flattener', 'main.js');