diff --git a/src/Install/GuidelineAssist.php b/src/Install/GuidelineAssist.php
index 8b8cd434..f65e6116 100644
--- a/src/Install/GuidelineAssist.php
+++ b/src/Install/GuidelineAssist.php
@@ -8,6 +8,7 @@
 use Illuminate\Support\Collection;
 use Illuminate\Support\Str;
 use Laravel\Boost\Install\Assists\Inertia;
+use Laravel\Roster\Enums\Approaches;
 use Laravel\Roster\Enums\NodePackageManager;
 use Laravel\Roster\Enums\Packages;
 use Laravel\Roster\Roster;
@@ -68,36 +69,43 @@ public function enums(): array
     protected function discover(callable $cb): array
     {
         $classes = [];
-        $appPath = app_path();
-
-        if (! is_dir($appPath)) {
-            return ['app-path-isnt-a-directory' => $appPath];
+        $paths = $this->roster->uses(Approaches::MODULAR)
+            ? array_filter([
+                base_path('modules'),
+                base_path('Modules'),
+                base_path('app-modules'),
+                app_path(),
+            ], is_dir(...))
+            : [app_path()];
+        $cacheKey = md5(implode('|', $paths));
+
+        if ($paths === []) {
+            return [];
         }
 
-        if (self::$classes === []) {
+        if (! isset(self::$classes[$cacheKey])) {
+            self::$classes[$cacheKey] = [];
             $finder = Finder::create()
-                ->in($appPath)
+                ->in($paths)
                 ->files()
                 ->name('/[A-Z].*\.php$/');
 
             foreach ($finder as $file) {
-                $relativePath = $file->getRelativePathname();
-                $namespace = app()->getNamespace();
-                $className = $namespace.str_replace(
-                    ['/', '.php'],
-                    ['\\', ''],
-                    $relativePath
-                );
-
                 try {
-                    $path = $appPath.DIRECTORY_SEPARATOR.$relativePath;
+                    $path = $file->getRealPath();
+
+                    if (! $path) {
+                        continue;
+                    }
 
                     if (! $this->fileHasClassLike($path)) {
                         continue;
                     }
 
-                    if (class_exists($className, false)) {
-                        self::$classes[$className] = $path;
+                    $className = $this->classNameFromFile($path);
+
+                    if ($className && class_exists($className)) {
+                        self::$classes[$cacheKey][$className] = $path;
                     }
                 } catch (Throwable) {
                     // Ignore exceptions and errors from class loading/reflection
@@ -105,7 +113,7 @@ protected function discover(callable $cb): array
             }
         }
 
-        foreach (self::$classes as $className => $path) {
+        foreach (self::$classes[$cacheKey] as $className => $path) {
             if ($cb(new ReflectionClass($className))) {
                 $classes[$className] = $path;
             }
@@ -114,6 +122,55 @@ protected function discover(callable $cb): array
         return $classes;
     }
 
+    protected function classNameFromFile(string $path): ?string
+    {
+        $code = file_get_contents($path);
+
+        if ($code === false) {
+            return null;
+        }
+
+        $namespace = null;
+        $class = null;
+
+        $tokens = token_get_all($code);
+        $count = count($tokens);
+
+        for ($i = 0; $i < $count; $i++) {
+            if (is_array($tokens[$i]) && $tokens[$i][0] === T_NAMESPACE) {
+                $namespace = '';
+
+                for ($j = $i + 1; $j < $count; $j++) {
+                    if (is_array($tokens[$j]) && in_array($tokens[$j][0], [T_STRING, T_NS_SEPARATOR, T_NAME_QUALIFIED], true)) {
+                        $namespace .= $tokens[$j][1];
+
+                        continue;
+                    }
+
+                    if ($tokens[$j] === ';' || $tokens[$j] === '{') {
+                        break;
+                    }
+                }
+            }
+
+            if (is_array($tokens[$i]) && in_array($tokens[$i][0], [T_CLASS, T_ENUM], true)) {
+                for ($j = $i + 1; $j < $count; $j++) {
+                    if (is_array($tokens[$j]) && $tokens[$j][0] === T_STRING) {
+                        $class = $tokens[$j][1];
+
+                        break 2;
+                    }
+                }
+            }
+        }
+
+        if (! $class) {
+            return null;
+        }
+
+        return $namespace ? "{$namespace}\\{$class}" : $class;
+    }
+
     public function fileHasClassLike(string $path): bool
     {
         static $cache = [];
diff --git a/tests/Feature/Install/GuidelineComposerTest.php b/tests/Feature/Install/GuidelineComposerTest.php
index 5dcde82a..fc14111f 100644
--- a/tests/Feature/Install/GuidelineComposerTest.php
+++ b/tests/Feature/Install/GuidelineComposerTest.php
@@ -27,6 +27,7 @@
     $this->herd->shouldReceive('isInstalled')->andReturn(false)->byDefault();
 
     $this->app->instance(Roster::class, $this->roster);
+    $this->roster->shouldReceive('uses')->andReturn(false)->byDefault();
 
     $this->composer = new GuidelineComposer($this->roster, $this->herd);
 });
diff --git a/tests/Feature/Install/SkillComposerTest.php b/tests/Feature/Install/SkillComposerTest.php
index e09d6308..d60da91a 100644
--- a/tests/Feature/Install/SkillComposerTest.php
+++ b/tests/Feature/Install/SkillComposerTest.php
@@ -16,6 +16,7 @@
     $this->roster = Mockery::mock(Roster::class);
     $this->roster->shouldReceive('nodePackageManager')->andReturn(NodePackageManager::NPM);
     $this->roster->shouldReceive('usesVersion')->andReturn(false);
+    $this->roster->shouldReceive('uses')->andReturn(false);
 
     $this->app->instance(Roster::class, $this->roster);
 });
diff --git a/tests/Feature/Mcp/Prompts/UpgradeInertiav3Test.php b/tests/Feature/Mcp/Prompts/UpgradeInertiav3Test.php
index 34d4b7ce..1be2ac12 100644
--- a/tests/Feature/Mcp/Prompts/UpgradeInertiav3Test.php
+++ b/tests/Feature/Mcp/Prompts/UpgradeInertiav3Test.php
@@ -14,6 +14,7 @@
 function mockRosterWithFrameworks(bool $react = false, bool $vue = false, bool $svelte = false): Roster
 {
     $roster = Mockery::mock(Roster::class);
+    $roster->shouldReceive('uses')->withAnyArgs()->andReturn(false)->byDefault();
     $roster->shouldReceive('uses')->with(Packages::INERTIA_REACT)->andReturn($react);
     $roster->shouldReceive('uses')->with(Packages::INERTIA_VUE)->andReturn($vue);
     $roster->shouldReceive('uses')->with(Packages::INERTIA_SVELTE)->andReturn($svelte);
diff --git a/tests/Unit/Install/GuidelineAssistTest.php b/tests/Unit/Install/GuidelineAssistTest.php
index 748136d1..92681a49 100644
--- a/tests/Unit/Install/GuidelineAssistTest.php
+++ b/tests/Unit/Install/GuidelineAssistTest.php
@@ -5,13 +5,14 @@
 use Laravel\Boost\Install\GuidelineAssist;
 use Laravel\Boost\Install\GuidelineConfig;
 use Laravel\Boost\Install\Sail;
+use Laravel\Roster\Enums\Approaches;
 use Laravel\Roster\Roster;
 
 beforeEach(function (): void {
     $this->roster = Mockery::mock(Roster::class);
     $this->roster->shouldReceive('nodePackageManager')->andReturn(null);
     $this->roster->shouldReceive('usesVersion')->andReturn(false);
-
+    $this->roster->shouldReceive('uses')->withAnyArgs()->andReturn(false)->byDefault();
     $this->config = new GuidelineConfig;
 });
 
@@ -203,3 +204,210 @@
     expect($assist->appPath())->toBe('src');
     expect($assist->appPath('path'.DIRECTORY_SEPARATOR.'to'.DIRECTORY_SEPARATOR.'file.php'))->toBe('src'.DIRECTORY_SEPARATOR.'path'.DIRECTORY_SEPARATOR.'to'.DIRECTORY_SEPARATOR.'file.php');
 })->after(fn () => app()->useAppPath('app'));
+
+test('discovers models outside the app directory', function (): void {
+    $tempDir = sys_get_temp_dir().'/boost_test_'.uniqid();
+    $modulesDir = $tempDir.'/modules/Blog/Models';
+    mkdir($modulesDir, 0777, true);
+
+    $modelPath = $modulesDir.'/Post.php';
+
+    file_put_contents($modelPath, <<<'PHP'
+<?php
+
+namespace Modules\Blog\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Post extends Model {}
+PHP);
+
+    $this->app->setBasePath($tempDir);
+    mkdir($tempDir.'/app', 0777, true);
+    $this->app->useAppPath($tempDir.'/app');
+
+    $this->roster
+        ->shouldReceive('uses')
+        ->with(Approaches::MODULAR)
+        ->andReturn(true);
+
+    require_once $modelPath;
+
+    try {
+        $assist = new GuidelineAssist($this->roster, new GuidelineConfig);
+
+        expect($assist->models())->toHaveKey('Modules\Blog\Models\Post');
+    } finally {
+        unlink($modelPath);
+        rmdir($modulesDir);
+        rmdir(dirname($modulesDir));
+        rmdir(dirname($modulesDir, 2));
+        rmdir($tempDir.'/app');
+        rmdir($tempDir);
+    }
+});
+
+test('discovers models in Modules directory (capital M)', function (): void {
+    $tempDir = sys_get_temp_dir().'/boost_test_'.uniqid();
+    $modulesDir = $tempDir.'/Modules/Blog/Models';
+    mkdir($modulesDir, 0777, true);
+
+    $modelPath = $modulesDir.'/Article.php';
+
+    file_put_contents($modelPath, <<<'PHP'
+<?php
+
+namespace Modules\Blog\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Article extends Model {}
+PHP);
+
+    $this->app->setBasePath($tempDir);
+    mkdir($tempDir.'/app', 0777, true);
+    $this->app->useAppPath($tempDir.'/app');
+
+    $this->roster
+        ->shouldReceive('uses')
+        ->with(Approaches::MODULAR)
+        ->andReturn(true);
+
+    require_once $modelPath;
+
+    try {
+        $assist = new GuidelineAssist($this->roster, new GuidelineConfig);
+
+        expect($assist->models())->toHaveKey('Modules\Blog\Models\Article');
+    } finally {
+        unlink($modelPath);
+        rmdir($modulesDir);
+        rmdir(dirname($modulesDir));
+        rmdir(dirname($modulesDir, 2));
+        rmdir($tempDir.'/app');
+        rmdir($tempDir);
+    }
+});
+
+test('discovers models in app-modules directory', function (): void {
+    $tempDir = sys_get_temp_dir().'/boost_test_'.uniqid();
+    $modulesDir = $tempDir.'/app-modules/Blog/Models';
+    mkdir($modulesDir, 0777, true);
+
+    $modelPath = $modulesDir.'/Comment.php';
+
+    file_put_contents($modelPath, <<<'PHP'
+<?php
+
+namespace AppModules\Blog\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Comment extends Model {}
+PHP);
+
+    $this->app->setBasePath($tempDir);
+    mkdir($tempDir.'/app', 0777, true);
+    $this->app->useAppPath($tempDir.'/app');
+
+    $this->roster
+        ->shouldReceive('uses')
+        ->with(Approaches::MODULAR)
+        ->andReturn(true);
+
+    require_once $modelPath;
+
+    try {
+        $assist = new GuidelineAssist($this->roster, new GuidelineConfig);
+
+        expect($assist->models())->toHaveKey('AppModules\Blog\Models\Comment');
+    } finally {
+        unlink($modelPath);
+        rmdir($modulesDir);
+        rmdir(dirname($modulesDir));
+        rmdir(dirname($modulesDir, 2));
+        rmdir($tempDir.'/app');
+        rmdir($tempDir);
+    }
+});
+
+test('discovers models in app directory when not modular', function (): void {
+    $tempDir = sys_get_temp_dir().'/boost_test_'.uniqid();
+    $appModelsDir = $tempDir.'/app/Models';
+    mkdir($appModelsDir, 0777, true);
+
+    $modelPath = $appModelsDir.'/User.php';
+
+    file_put_contents($modelPath, <<<'PHP'
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class User extends Model {}
+PHP);
+
+    $this->app->setBasePath($tempDir);
+    $this->app->useAppPath($tempDir.'/app');
+
+    $this->roster
+        ->shouldReceive('uses')
+        ->with(Approaches::MODULAR)
+        ->andReturn(false);
+
+    require_once $modelPath;
+
+    try {
+        $assist = new GuidelineAssist($this->roster, new GuidelineConfig);
+
+        expect($assist->models())->toHaveKey('App\Models\User');
+    } finally {
+        unlink($modelPath);
+        rmdir($appModelsDir);
+        rmdir($tempDir.'/app');
+        rmdir($tempDir);
+    }
+});
+
+test('does not discover models outside app directory when not modular', function (): void {
+    $tempDir = sys_get_temp_dir().'/boost_test_'.uniqid();
+    $modulesDir = $tempDir.'/modules/Blog/Models';
+    mkdir($modulesDir, 0777, true);
+    mkdir($tempDir.'/app', 0777, true);
+
+    $modelPath = $modulesDir.'/Tag.php';
+
+    file_put_contents($modelPath, <<<'PHP'
+<?php
+
+namespace Modules\Blog\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Tag extends Model {}
+PHP);
+
+    $this->app->setBasePath($tempDir);
+    $this->app->useAppPath($tempDir.'/app');
+
+    $this->roster
+        ->shouldReceive('uses')
+        ->with(Approaches::MODULAR)
+        ->andReturn(false);
+
+    require_once $modelPath;
+
+    try {
+        $assist = new GuidelineAssist($this->roster, new GuidelineConfig);
+
+        expect($assist->models())->not->toHaveKey('Modules\Blog\Models\Tag');
+    } finally {
+        unlink($modelPath);
+        rmdir($modulesDir);
+        rmdir(dirname($modulesDir));
+        rmdir(dirname($modulesDir, 2));
+        rmdir($tempDir.'/app');
+        rmdir($tempDir);
+    }
+});