diff --git a/src/Integrations/Core/EnvironmentProbe.php b/src/Integrations/Core/EnvironmentProbe.php
index aca8d8e..b2984ec 100644
--- a/src/Integrations/Core/EnvironmentProbe.php
+++ b/src/Integrations/Core/EnvironmentProbe.php
@@ -4,14 +4,21 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Integrations\Core;
 
+use LIT\MCP\Integrations\Divi\DiviCompatibility;
+
 defined('ABSPATH') || exit;
 
 /**
- * Detects the themes/plugins LIT MCP integrates with.
+ * Detects the themes/plugins LIT MCP integrates with; for Divi also the internals that are missing
+ * (DiviCompatibility).
  */
 class EnvironmentProbe
 {
-    /** @return list<array{id: string, active: bool, version: ?string}> */
+    public function __construct(private ?DiviCompatibility $divi = null)
+    {
+    }
+
+    /** @return list<array{id: string, active: bool, version: ?string, problems: list<string>}> */
     public function components(): array
     {
         $theme = wp_get_theme();
@@ -22,16 +29,23 @@ class EnvironmentProbe
         $tecActive = class_exists('Tribe__Events__Main');
 
         return [
-            ['id' => 'divi', 'active' => $isDivi, 'version' => $diviVersion],
+            [
+                'id' => 'divi',
+                'active' => $isDivi,
+                'version' => $diviVersion,
+                'problems' => $isDivi ? ($this->divi ?? new DiviCompatibility())->problems() : [],
+            ],
             [
                 'id' => 'pods',
                 'active' => defined('PODS_VERSION'),
                 'version' => defined('PODS_VERSION') ? (string) PODS_VERSION : null,
+                'problems' => [],
             ],
             [
                 'id' => 'the-events-calendar',
                 'active' => $tecActive,
                 'version' => $tecActive ? (string) constant('Tribe__Events__Main::VERSION') : null,
+                'problems' => [],
             ],
         ];
     }
diff --git a/src/Integrations/Core/SiteStatusAbility.php b/src/Integrations/Core/SiteStatusAbility.php
index 2313c7c..e1212fb 100644
--- a/src/Integrations/Core/SiteStatusAbility.php
+++ b/src/Integrations/Core/SiteStatusAbility.php
@@ -30,7 +30,8 @@ final class SiteStatusAbility implements Ability
     public function description(): string
     {
         return 'Überblick: Website, WordPress-Version, eigener Benutzer und Rollen, '
-            . 'erkannte Integrationen (Divi, Pods, The Events Calendar).';
+            . 'erkannte Integrationen (Divi, Pods, The Events Calendar). '
+            . 'Bei Divi nennt problems Divi-Funktionen, die nach einem Update fehlen.';
     }
 
     public function inputSchema(): array
diff --git a/src/Integrations/Divi/DiviCompatibility.php b/src/Integrations/Divi/DiviCompatibility.php
new file mode 100644
index 0000000..434ad87
--- /dev/null
+++ b/src/Integrations/Divi/DiviCompatibility.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi;
+
+use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
+use LIT\MCP\Integrations\Divi\Pages\DynamicContentMap;
+use LIT\MCP\Integrations\Divi\Schema\DiviModules;
+use Throwable;
+
+defined('ABSPATH') || exit;
+
+/**
+ * Live check of the Divi internals LIT MCP relies on (decisions note §5, E15): classes,
+ * functions, the library post type and taxonomies. lit-site-status shows the failed checks, so a
+ * Divi update that moves one of them is visible before a tool reports "unsupported".
+ */
+final class DiviCompatibility
+{
+    /** @param array<string, callable(): bool>|null $checks Label => check; null = defaults(). */
+    public function __construct(private ?array $checks = null)
+    {
+    }
+
+    /** @return list<string> Labels of the checks that failed or threw. */
+    public function problems(): array
+    {
+        $problems = [];
+        foreach ($this->checks ?? self::defaults() as $label => $check) {
+            try {
+                $ok = (bool) $check();
+            } catch (Throwable) {
+                $ok = false;
+            }
+            if (! $ok) {
+                $problems[] = (string) $label;
+            }
+        }
+
+        return $problems;
+    }
+
+    /** @return array<string, callable(): bool> */
+    public static function defaults(): array
+    {
+        return [
+            'ModuleRegistration (Modul-Katalog)' => static fn (): bool => DiviModules::isAvailable(),
+            'DynamicContentOptions (Dynamic Content)' =>
+                static fn (): bool => class_exists(DynamicContentMap::REGISTRY),
+            'et_pb_is_allowed (Divi-Rollen)' => static fn (): bool => function_exists('et_pb_is_allowed'),
+            'Post-Typ et_pb_layout (Bibliothek)' =>
+                static fn (): bool => post_type_exists(DiviLibraryStore::POST_TYPE),
+            'Taxonomien scope, layout_type, module_width (Bibliothek)' =>
+                static fn (): bool => (new DiviLibraryStore())->missingTaxonomies() === [],
+            'GlobalLayout::is_global_layout_template (globale Module)' =>
+                static fn (): bool => method_exists(DiviLibraryStore::GLOBAL_LAYOUT, 'is_global_layout_template'),
+            'ET_Core_PageResource (CSS-Cache)' => static fn (): bool => class_exists('ET_Core_PageResource'),
+        ];
+    }
+}
diff --git a/src/Integrations/Divi/Library/DiviLibraryStore.php b/src/Integrations/Divi/Library/DiviLibraryStore.php
new file mode 100644
index 0000000..c393d22
--- /dev/null
+++ b/src/Integrations/Divi/Library/DiviLibraryStore.php
@@ -0,0 +1,152 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Library;
+
+use WP_Post;
+use WP_Term;
+
+defined('ABSPATH') || exit;
+
+/**
+ * Adapter for the Divi Library (E4, E15): post type et_pb_layout, the taxonomies scope,
+ * layout_type, module_width, layout_category, layout_tag and the meta Divi's et_pb_submit_layout()
+ * writes (F1, F2, fixtures stage3). "Global" is Divi's own definition
+ * GlobalLayout::is_global_layout_template() (F5) with the scope term as fallback when the class is
+ * gone. find() filters by the scope term only, so an entry Divi counts as global through its D4
+ * meta fallback can show up under scope "normal" (preflight M-12, accepted). Library entries are
+ * always "publish" (F2). Not final so abilities can be tested with a mock.
+ */
+class DiviLibraryStore
+{
+    public const POST_TYPE = 'et_pb_layout';
+
+    public const GLOBAL_LAYOUT = 'ET\Builder\Packages\GlobalLayout\GlobalLayout';
+
+    public const LAYOUT_TYPES = ['layout', 'section', 'row', 'module'];
+
+    /** Taxonomies every new entry needs (et_pb_submit_layout). */
+    public const TAXONOMIES = ['scope', 'layout_type', 'module_width'];
+
+    public function isGlobal(int $id): bool
+    {
+        if (method_exists(self::GLOBAL_LAYOUT, 'is_global_layout_template')) {
+            return (bool) call_user_func([self::GLOBAL_LAYOUT, 'is_global_layout_template'], $id);
+        }
+
+        return in_array('global', $this->termSlugs($id, 'scope'), true);
+    }
+
+    /** "layout", "section", "row" or "module"; null when the entry has no known type. */
+    public function layoutType(int $id): ?string
+    {
+        foreach ($this->termSlugs($id, 'layout_type') as $slug) {
+            if (in_array($slug, self::LAYOUT_TYPES, true)) {
+                return $slug;
+            }
+        }
+
+        return null;
+    }
+
+    /** @return list<string> */
+    public function termSlugs(int $id, string $taxonomy): array
+    {
+        return array_map(static fn (WP_Term $term): string => (string) $term->slug, $this->terms($id, $taxonomy));
+    }
+
+    /** @return list<string> */
+    public function termNames(int $id, string $taxonomy): array
+    {
+        return array_map(static fn (WP_Term $term): string => (string) $term->name, $this->terms($id, $taxonomy));
+    }
+
+    /**
+     * Published entries, $limit + 1 of them (Cursor::page() tells whether there are more).
+     *
+     * @param array{layout_type?: string, scope?: string, search?: string, category?: string} $filters
+     *        scope: "global" or "normal"; category: name of a layout_category term.
+     * @return list<WP_Post>
+     */
+    public function find(array $filters, int $limit, int $offset): array
+    {
+        $taxQuery = [];
+        if (in_array($filters['layout_type'] ?? '', self::LAYOUT_TYPES, true)) {
+            $taxQuery[] = ['taxonomy' => 'layout_type', 'field' => 'slug', 'terms' => [$filters['layout_type']]];
+        }
+        if (($filters['scope'] ?? '') === 'global') {
+            $taxQuery[] = ['taxonomy' => 'scope', 'field' => 'slug', 'terms' => ['global']];
+        } elseif (($filters['scope'] ?? '') === 'normal') {
+            $taxQuery[] = ['taxonomy' => 'scope', 'field' => 'slug', 'terms' => ['global'], 'operator' => 'NOT IN'];
+        }
+        if (($filters['category'] ?? '') !== '') {
+            $taxQuery[] = ['taxonomy' => 'layout_category', 'field' => 'name', 'terms' => [$filters['category']]];
+        }
+
+        $args = [
+            'post_type' => self::POST_TYPE,
+            'post_status' => 'publish',
+            'posts_per_page' => $limit + 1,
+            'offset' => $offset,
+            'orderby' => 'title',
+            'order' => 'ASC',
+            'no_found_rows' => true,
+            'suppress_filters' => false,
+        ];
+        if (($filters['search'] ?? '') !== '') {
+            $args['s'] = $filters['search'];
+        }
+        if ($taxQuery !== []) {
+            // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_tax_query -- the library is small.
+            $args['tax_query'] = array_merge(['relation' => 'AND'], $taxQuery);
+        }
+
+        return array_values(array_filter(get_posts($args), static fn (mixed $post): bool => $post instanceof WP_Post));
+    }
+
+    /**
+     * @return array{id: int, title: string, layout_type: ?string, scope: string, module_type: ?string,
+     *     categories: list<string>, tags: list<string>, modified: string}
+     */
+    public function describe(WP_Post $post): array
+    {
+        $id = (int) $post->ID;
+        $moduleType = (string) get_post_meta($id, '_et_pb_module_type', true);
+
+        return [
+            'id' => $id,
+            'title' => (string) $post->post_title,
+            'layout_type' => $this->layoutType($id),
+            'scope' => $this->isGlobal($id) ? 'global' : 'normal',
+            'module_type' => $moduleType === '' ? null : $moduleType,
+            'categories' => $this->termNames($id, 'layout_category'),
+            'tags' => $this->termNames($id, 'layout_tag'),
+            'modified' => (string) $post->post_modified_gmt,
+        ];
+    }
+
+    /**
+     * Library taxonomies not registered in this request (F2: Divi registers them in
+     * ET_Builder_Library; fixture finding 6: not in every context).
+     *
+     * @return list<string>
+     */
+    public function missingTaxonomies(): array
+    {
+        return array_values(array_filter(
+            self::TAXONOMIES,
+            static fn (string $taxonomy): bool => ! taxonomy_exists($taxonomy)
+        ));
+    }
+
+    /** @return list<WP_Term> */
+    private function terms(int $id, string $taxonomy): array
+    {
+        $terms = get_the_terms($id, $taxonomy);
+
+        return is_array($terms)
+            ? array_values(array_filter($terms, static fn (mixed $term): bool => $term instanceof WP_Term))
+            : [];
+    }
+}
diff --git a/src/Integrations/Divi/Library/DiviRoles.php b/src/Integrations/Divi/Library/DiviRoles.php
new file mode 100644
index 0000000..1adc241
--- /dev/null
+++ b/src/Integrations/Divi/Library/DiviRoles.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Library;
+
+use Closure;
+use LIT\MCP\Abilities\Errors;
+use WP_Error;
+
+defined('ABSPATH') || exit;
+
+/**
+ * Adapter for Divi's role editor (E3, E15): et_pb_is_allowed() (Divi 5.2.1 builder/core.php:1128)
+ * answers for the current user's role, "dangerous" options (theme_builder,
+ * read_dynamic_content_custom_fields) default to off for every role but administrator. When
+ * Divi no longer has the function, nothing is allowed – DiviCompatibility reports it.
+ * Not final so tests can pass a check.
+ */
+class DiviRoles
+{
+    private const LABELS = [
+        'divi_library' => 'Divi-Bibliothek',
+        'save_library' => 'In der Bibliothek speichern',
+        'add_library' => 'Aus der Bibliothek hinzufügen',
+        'edit_global_library' => 'Globale Bibliothekselemente bearbeiten',
+        'read_dynamic_content_custom_fields' => 'Dynamic Content: benutzerdefinierte Felder lesen',
+    ];
+
+    /** @param (Closure(string): bool)|null $check Test seam; null = Divi's et_pb_is_allowed(). */
+    public function __construct(private ?Closure $check = null)
+    {
+    }
+
+    public function allows(string $capability): bool
+    {
+        if ($this->check !== null) {
+            return ($this->check)($capability);
+        }
+
+        return function_exists('et_pb_is_allowed') && (bool) et_pb_is_allowed($capability);
+    }
+
+    /** Null when the role allows $capability, else a forbidden error naming the option. */
+    public function refusal(string $capability): ?WP_Error
+    {
+        if ($this->allows($capability)) {
+            return null;
+        }
+
+        return Errors::forbidden(
+            sprintf('Die Divi-Rolle dieses Kontos erlaubt „%s“ nicht.', self::LABELS[$capability] ?? $capability),
+            'Einen Administrator bitten, das Recht unter Divi → Rollen-Editor freizugeben.'
+        );
+    }
+}
diff --git a/src/Integrations/Divi/Pages/DynamicContentMap.php b/src/Integrations/Divi/Pages/DynamicContentMap.php
index 10f0c6a..941ef6c 100644
--- a/src/Integrations/Divi/Pages/DynamicContentMap.php
+++ b/src/Integrations/Divi/Pages/DynamicContentMap.php
@@ -31,7 +31,8 @@ defined('ABSPATH') || exit;
  */
 class DynamicContentMap
 {
-    private const REGISTRY = 'ET\Builder\Packages\Module\Layout\Components\DynamicContent\DynamicContentOptions';
+    /** Divi's dynamic-content registry class; also checked by DiviCompatibility. */
+    public const REGISTRY = 'ET\Builder\Packages\Module\Layout\Components\DynamicContent\DynamicContentOptions';
 
     /**
      * @param (Closure(int): mixed)|null $registry Registry lookup by post ID (tests); null = Divi's.
diff --git a/tests/Unit/Integrations/Core/EnvironmentProbeTest.php b/tests/Unit/Integrations/Core/EnvironmentProbeTest.php
new file mode 100644
index 0000000..2dfb442
--- /dev/null
+++ b/tests/Unit/Integrations/Core/EnvironmentProbeTest.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Core;
+
+use Brain\Monkey\Functions;
+use LIT\MCP\Integrations\Core\EnvironmentProbe;
+use LIT\MCP\Integrations\Divi\DiviCompatibility;
+use LIT\MCP\Tests\Unit\TestCase;
+use Mockery;
+
+final class EnvironmentProbeTest extends TestCase
+{
+    public function testDiviComponentCarriesTheCompatibilityFindings(): void
+    {
+        $theme = Mockery::mock();
+        $theme->allows('get_template')->andReturn('Divi');
+        $theme->allows('parent')->andReturn(false);
+        $theme->allows('get')->with('Version')->andReturn('5.2.1');
+        Functions\when('wp_get_theme')->justReturn($theme);
+
+        $probe = new EnvironmentProbe(new DiviCompatibility(['GlobalLayout' => static fn (): bool => false]));
+        $components = array_column($probe->components(), null, 'id');
+
+        self::assertSame(['GlobalLayout'], $components['divi']['problems']);
+        self::assertSame([], $components['pods']['problems']);
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/DiviCompatibilityTest.php b/tests/Unit/Integrations/Divi/DiviCompatibilityTest.php
new file mode 100644
index 0000000..f3840e7
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/DiviCompatibilityTest.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi;
+
+use LIT\MCP\Integrations\Divi\DiviCompatibility;
+use PHPUnit\Framework\TestCase;
+use RuntimeException;
+
+final class DiviCompatibilityTest extends TestCase
+{
+    public function testListsFailedAndThrowingChecks(): void
+    {
+        $compatibility = new DiviCompatibility([
+            'A' => static fn (): bool => true,
+            'B' => static fn (): bool => false,
+            'C' => static function (): bool {
+                throw new RuntimeException('Divi changed');
+            },
+        ]);
+
+        self::assertSame(['B', 'C'], $compatibility->problems());
+    }
+
+    public function testDefaultsCoverTheDiviInternalsInUse(): void
+    {
+        self::assertSame(
+            [
+                'ModuleRegistration (Modul-Katalog)',
+                'DynamicContentOptions (Dynamic Content)',
+                'et_pb_is_allowed (Divi-Rollen)',
+                'Post-Typ et_pb_layout (Bibliothek)',
+                'Taxonomien scope, layout_type, module_width (Bibliothek)',
+                'GlobalLayout::is_global_layout_template (globale Module)',
+                'ET_Core_PageResource (CSS-Cache)',
+            ],
+            array_keys(DiviCompatibility::defaults())
+        );
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php b/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php
new file mode 100644
index 0000000..9304c4d
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php
@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Library;
+
+use Brain\Monkey\Functions;
+use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
+use LIT\MCP\Tests\Unit\TestCase;
+use WP_Post;
+use WP_Term;
+
+final class DiviLibraryStoreTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $terms = [
+            1058 => [
+                'scope' => [new WP_Term(['slug' => 'global', 'name' => 'global'])],
+                'layout_type' => [new WP_Term(['slug' => 'section', 'name' => 'section'])],
+                'layout_category' => [new WP_Term(['slug' => 'kopf', 'name' => 'Kopfbereiche'])],
+            ],
+            1055 => [
+                'scope' => [new WP_Term(['slug' => 'non_global', 'name' => 'non_global'])],
+                'layout_type' => [new WP_Term(['slug' => 'section', 'name' => 'section'])],
+            ],
+            1057 => [],
+        ];
+        Functions\when('get_the_terms')->alias(
+            static fn (int $id, string $taxonomy): array|false => $terms[$id][$taxonomy] ?? false
+        );
+        Functions\when('get_post_meta')->alias(
+            static fn (int $id, string $key): string => $id === 1057 && $key === '_et_pb_module_type' ? 'divi/blurb' : ''
+        );
+    }
+
+    public function testGlobalScopeAndLayoutTypeFromTheTerms(): void
+    {
+        $store = new DiviLibraryStore();
+
+        self::assertTrue($store->isGlobal(1058));
+        self::assertFalse($store->isGlobal(1055));
+        self::assertSame('section', $store->layoutType(1058));
+        self::assertNull($store->layoutType(1057));
+        self::assertSame(['Kopfbereiche'], $store->termNames(1058, 'layout_category'));
+    }
+
+    public function testDescribesAnEntry(): void
+    {
+        $post = new WP_Post([
+            'ID' => 1057, 'post_type' => 'et_pb_layout', 'post_title' => '[Fixture] Library-Modul',
+            'post_modified_gmt' => '2026-09-26 20:56:29',
+        ]);
+
+        self::assertSame(
+            [
+                'id' => 1057, 'title' => '[Fixture] Library-Modul', 'layout_type' => null, 'scope' => 'normal',
+                'module_type' => 'divi/blurb', 'categories' => [], 'tags' => [], 'modified' => '2026-09-26 20:56:29',
+            ],
+            (new DiviLibraryStore())->describe($post)
+        );
+    }
+
+    public function testFindQueriesPublishedEntriesWithFilters(): void
+    {
+        $captured = [];
+        Functions\when('get_posts')->alias(static function (array $args) use (&$captured): array {
+            $captured = $args;
+
+            return [];
+        });
+
+        (new DiviLibraryStore())->find(
+            ['layout_type' => 'section', 'scope' => 'normal', 'search' => 'Kopf', 'category' => 'Kopfbereiche'],
+            20,
+            40
+        );
+
+        self::assertSame('et_pb_layout', $captured['post_type']);
+        self::assertSame('publish', $captured['post_status']);
+        self::assertSame(21, $captured['posts_per_page']);
+        self::assertSame(40, $captured['offset']);
+        self::assertSame('Kopf', $captured['s']);
+        self::assertSame(
+            [
+                'relation' => 'AND',
+                ['taxonomy' => 'layout_type', 'field' => 'slug', 'terms' => ['section']],
+                ['taxonomy' => 'scope', 'field' => 'slug', 'terms' => ['global'], 'operator' => 'NOT IN'],
+                ['taxonomy' => 'layout_category', 'field' => 'name', 'terms' => ['Kopfbereiche']],
+            ],
+            $captured['tax_query']
+        );
+    }
+
+    public function testReportsMissingTaxonomies(): void
+    {
+        Functions\when('taxonomy_exists')->alias(static fn (string $taxonomy): bool => $taxonomy !== 'scope');
+
+        self::assertSame(['scope'], (new DiviLibraryStore())->missingTaxonomies());
+    }
+}
diff --git a/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php b/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php
new file mode 100644
index 0000000..876e5cf
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Library;
+
+use LIT\MCP\Integrations\Divi\Library\DiviRoles;
+use LIT\MCP\Tests\Unit\TestCase;
+
+final class DiviRolesTest extends TestCase
+{
+    public function testAsksTheCheckAndExplainsARefusal(): void
+    {
+        $roles = new DiviRoles(static fn (string $cap): bool => $cap !== 'edit_global_library');
+
+        self::assertTrue($roles->allows('divi_library'));
+        self::assertNull($roles->refusal('divi_library'));
+        $refusal = $roles->refusal('edit_global_library');
+        self::assertToolError($refusal, 'forbidden');
+        self::assertStringContainsString('Globale Bibliothekselemente bearbeiten', $refusal->get_error_message());
+        self::assertStringContainsString('Rollen-Editor', $refusal->get_error_message());
+    }
+
+    public function testWithoutDiviNothingIsAllowed(): void
+    {
+        // Unit tests have no et_pb_is_allowed(): a missing Divi function never means "allowed".
+        self::assertFalse((new DiviRoles())->allows('divi_library'));
+    }
+}