diff --git a/src/Integrations/Divi/DiviIntegration.php b/src/Integrations/Divi/DiviIntegration.php
index 1b606ef..d2e84fa 100644
--- a/src/Integrations/Divi/DiviIntegration.php
+++ b/src/Integrations/Divi/DiviIntegration.php
@@ -36,6 +36,7 @@ use LIT\MCP\Integrations\Divi\Schema\DiviModules;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\DiviThemeBuilder;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderAccess;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderEdits;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderIntegration;
 use LIT\MCP\Integrations\Integration;
 use LIT\MCP\Integrations\WordPress\Content\ContentComposer;
 use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
@@ -170,6 +171,17 @@ final class DiviIntegration implements Integration
         );
     }
 
+    /** The group "Divi Theme Builder" (lit/tb-*), sharing this integration's Theme Builder access (Etappe 3b). */
+    public function themeBuilder(): ThemeBuilderIntegration
+    {
+        return new ThemeBuilderIntegration(
+            $this->themeBuilderAccess,
+            new DiviComposition($this->modules, $this->design),
+            new DiviSaver(),
+            $this->log
+        );
+    }
+
     private function writer(DiviPageLoader $loader): DiviWriter
     {
         return new DiviWriter(
diff --git a/src/Integrations/Divi/ThemeBuilder/TbListAbility.php b/src/Integrations/Divi/ThemeBuilder/TbListAbility.php
new file mode 100644
index 0000000..d678905
--- /dev/null
+++ b/src/Integrations/Divi/ThemeBuilder/TbListAbility.php
@@ -0,0 +1,187 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\ThemeBuilder;
+
+use LIT\MCP\Abilities\Ability;
+use LIT\MCP\Abilities\Annotations;
+use LIT\MCP\Abilities\Errors;
+use LIT\MCP\Integrations\WordPress\PostGuard;
+use WP_Error;
+
+defined('ABSPATH') || exit;
+
+/**
+ * lit/tb-list (spec §5.7): the templates of the live Theme Builder with conditions (Divi's labels), layouts
+ * (title, shared with other templates – the "global" header/footer is the default template's layout shared by
+ * ID), template_rev for the writing TB tools; templates a later Theme Builder save removed ("detached", with
+ * Divi's unused mark – Divi trashes marked posts 7 days later, F19, stage3b finding 10) so they can be
+ * reattached; optionally Divi's condition catalog. Needs ThemeBuilderAccess::canUse(). Ruling Q8/B11: a
+ * template the user may not edit does not appear at all (not listed, not in shared_with, asked for by ID it
+ * reads like a missing one – P12); layout titles only for layouts the user may edit; condition labels name
+ * objects by the stored ID only, never by title.
+ */
+final class TbListAbility implements Ability
+{
+    public const DETACHED_LIMIT = 50;
+
+    public function __construct(private ThemeBuilderAccess $access, private TemplateConditions $conditions)
+    {
+    }
+
+    public function name(): string
+    {
+        return 'lit/tb-list';
+    }
+
+    public function label(): string
+    {
+        return 'Theme-Builder-Vorlagen';
+    }
+
+    public function description(): string
+    {
+        return 'Listet die Vorlagen des Divi Theme Builders: aktiv oder deaktiviert, Bedingungen mit Beschriftung, '
+            . 'Layouts für Kopfzeile, Inhalt und Fußzeile (Layout-IDs lassen sich mit den Divi-Werkzeugen bearbeiten, '
+            . 'z. B. lit-divi-outline mit post_id) und template_rev für lit/tb-assign und lit/tb-activate. '
+            . 'template_id: nur diese Vorlage. conditions: true liefert alle Bedingungen, die Divi anbietet; IDs, die '
+            . 'auf „:“ enden, brauchen ein Objekt (z. B. "singular:post_type:page:id:42"). detached: Vorlagen, die ein '
+            . 'späteres Speichern im Theme Builder entfernt hat; nur auf ausdrücklichen Wunsch wieder zuordnen.';
+    }
+
+    public function inputSchema(): array
+    {
+        return [
+            'type' => 'object',
+            'properties' => [
+                'template_id' => ['type' => 'integer', 'minimum' => 1],
+                'conditions' => ['type' => 'boolean', 'description' => 'Divis Bedingungen mitliefern.'],
+            ],
+            'additionalProperties' => false,
+        ];
+    }
+
+    public function outputSchema(): ?array
+    {
+        $objects = ['type' => 'array', 'items' => ['type' => 'object']];
+
+        return [
+            'type' => 'object',
+            'properties' => [
+                'theme_builder_id' => ['type' => 'integer'],
+                'draft_pending' => ['type' => 'boolean'],
+                'templates' => $objects,
+                'detached' => $objects,
+                'conditions' => $objects,
+                'notes' => ['type' => 'array', 'items' => ['type' => 'string']],
+            ],
+            'required' => ['theme_builder_id', 'draft_pending', 'templates', 'detached', 'notes'],
+        ];
+    }
+
+    public function annotations(): array
+    {
+        return Annotations::read();
+    }
+
+    public function isDirect(): bool
+    {
+        return false;
+    }
+
+    public function permission(array $input): bool|WP_Error
+    {
+        return $this->access->canUse() ?? true;
+    }
+
+    public function execute(array $input): mixed
+    {
+        $refusal = $this->access->canUse();
+        if ($refusal !== null) {
+            return $refusal;
+        }
+
+        $store = $this->access->store();
+        $editable = fn (Template $template): bool => $this->access->canEditTemplate($template->id);
+        $live = array_values(array_filter($store->liveTemplates(), $editable));
+        $detached = [];
+        foreach ($store->detachedIds(self::DETACHED_LIMIT) as $id) {
+            $template = $store->template($id, false);
+            if ($template !== null && $editable($template)) {
+                $detached[] = $template;
+            }
+        }
+        // Only what the user may see counts for shared_with (B11).
+        $shared = array_merge($live, $detached);
+
+        if (isset($input['template_id'])) {
+            $id = (int) PostGuard::id($input['template_id']);
+            $only = static fn (array $list): array => array_values(
+                array_filter($list, static fn (Template $template): bool => $template->id === $id)
+            );
+            $live = $only($live);
+            $detached = $only($detached);
+            if ($live === [] && $detached === []) {
+                return Errors::notFound(
+                    sprintf('Theme-Builder-Vorlage %d gibt es nicht.', $id),
+                    'Vorlagen mit lit/tb-list ohne template_id auflisten.'
+                );
+            }
+        }
+
+        $draft = $store->draftId() > 0;
+        $notes = [];
+        if ($draft) {
+            $notes[] = 'Der Theme Builder hat ungespeicherte Änderungen (Entwurf); bis sie dort gespeichert oder '
+                . 'verworfen sind, ändert LIT MCP keine Vorlagen.';
+        }
+        if ($detached !== []) {
+            $notes[] = 'detached: Diese Vorlagen hat ein späteres Speichern im Theme Builder entfernt – oder jemand '
+                . 'hat sie dort bewusst gelöscht; Divi löscht als ungenutzt markierte Vorlagen und Layouts 7 Tage '
+                . 'nach der Markierung. Nur auf ausdrücklichen Wunsch wieder zuordnen (bleibt deaktiviert): '
+                . 'lit/tb-assign mit reattach: true.';
+        }
+
+        $result = [
+            'theme_builder_id' => $store->liveId(),
+            'draft_pending' => $draft,
+            'templates' => array_map(fn (Template $t): array => $this->describe($t, $shared), $live),
+            'detached' => array_map(fn (Template $t): array => $this->describe($t, $shared), $detached),
+            'notes' => $notes,
+        ];
+        if (($input['conditions'] ?? false) === true) {
+            $result['conditions'] = $this->conditions->available();
+        }
+
+        return $result;
+    }
+
+    /**
+     * @param list<Template> $visible Templates the user may see (the shared_with candidates).
+     * @return array<string, mixed>
+     */
+    private function describe(Template $template, array $visible): array
+    {
+        $row = $template->toArray();
+        foreach (Template::AREAS as $area) {
+            $id = $template->layouts[$area]['id'];
+            $others = array_filter(
+                $visible,
+                static fn (Template $other): bool => $id > 0 && $other->id !== $template->id
+                    && $other->layouts[$area]['id'] === $id
+            );
+            $row['layouts'][$area]['title'] = $id > 0 && current_user_can('edit_post', $id)
+                ? (string) get_the_title($id)
+                : '';
+            $row['layouts'][$area]['shared_with'] = array_values(array_map(
+                static fn (Template $other): int => $other->id,
+                $others
+            ));
+        }
+        $row['use_on_labels'] = array_map($this->conditions->label(...), $template->useOn);
+        $row['exclude_from_labels'] = array_map($this->conditions->label(...), $template->excludeFrom);
+
+        return $row;
+    }
+}
diff --git a/src/Integrations/Divi/ThemeBuilder/ThemeBuilderIntegration.php b/src/Integrations/Divi/ThemeBuilder/ThemeBuilderIntegration.php
new file mode 100644
index 0000000..10cee8e
--- /dev/null
+++ b/src/Integrations/Divi/ThemeBuilder/ThemeBuilderIntegration.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\ThemeBuilder;
+
+use LIT\MCP\ChangeLog\ChangeLog;
+use LIT\MCP\Integrations\Divi\Pages\DiviComposition;
+use LIT\MCP\Integrations\Divi\Pages\DiviSaver;
+use LIT\MCP\Integrations\Divi\Schema\DiviModules;
+use LIT\MCP\Integrations\Integration;
+
+defined('ABSPATH') || exit;
+
+/**
+ * The group "Divi Theme Builder" (Etappe 3b): lit/tb-list, lit/tb-create-template, lit/tb-assign and
+ * lit/tb-activate, all indirect. Built by DiviIntegration::themeBuilder() so it shares the Theme Builder access
+ * (rights, Tools-tab gates – its id ThemeBuilderAccess::GROUP is what the gates of the Divi tools ask; once this
+ * group is registered, its mode and "nur lesen" switch in the Tools tab drive them). Available with the Divi 5
+ * builder, like the Divi group; missing Divi internals show in lit-site-status. Composition, saver and log are
+ * for the writing tools of the later tasks.
+ */
+final class ThemeBuilderIntegration implements Integration
+{
+    public function __construct(
+        private ThemeBuilderAccess $access,
+        private DiviComposition $composition,
+        private DiviSaver $saver,
+        private ChangeLog $log
+    ) {
+    }
+
+    public function id(): string
+    {
+        return ThemeBuilderAccess::GROUP;
+    }
+
+    public function label(): string
+    {
+        return __('Divi Theme Builder', 'wp-lit-mcp');
+    }
+
+    public function isAvailable(): bool
+    {
+        return DiviModules::isAvailable();
+    }
+
+    public function abilities(): array
+    {
+        $conditions = new TemplateConditions($this->access->store());
+
+        return [
+            new TbListAbility($this->access, $conditions),
+        ];
+    }
+}
diff --git a/src/Plugin.php b/src/Plugin.php
index 1a17adb..54fd99b 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -123,7 +123,8 @@ final class Plugin
             ),
             new MediaIntegration($schema, $changeLog, $limits),
             $divi,
-            $divi->library()
+            $divi->library(),
+            $divi->themeBuilder()
         );
 
         $policy = ExposurePolicy::fromOption()->withGroups($registry->groupMap(...));
diff --git a/tests/Unit/Integrations/Divi/DiviIntegrationTest.php b/tests/Unit/Integrations/Divi/DiviIntegrationTest.php
index 7904b2c..6629d7d 100644
--- a/tests/Unit/Integrations/Divi/DiviIntegrationTest.php
+++ b/tests/Unit/Integrations/Divi/DiviIntegrationTest.php
@@ -69,6 +69,25 @@ final class DiviIntegrationTest extends TestCase
         }
     }
 
+    public function testProvidesTheThemeBuilderGroup(): void
+    {
+        Functions\when('__')->returnArg();
+        $group = (new DiviIntegration(Mockery::mock(ContentSchema::class), FakeChangeLog::forbidden()))->themeBuilder();
+
+        self::assertSame('divi-theme-builder', $group->id());
+        self::assertSame('Divi Theme Builder', $group->label());
+        self::assertFalse($group->isAvailable(), 'no Divi classes in unit tests');
+        self::assertSame(
+            ['lit/tb-list'],
+            array_map(static fn (Ability $ability): string => $ability->name(), $group->abilities())
+        );
+        foreach ($group->abilities() as $ability) {
+            self::assertFalse($ability->inputSchema()['additionalProperties'], $ability->name());
+            self::assertNotNull($ability->outputSchema(), $ability->name());
+            self::assertFalse($ability->isDirect(), $ability->name());
+        }
+    }
+
     /** Ruling P9 (E9): lit/divi-node-copy follows lit/divi-insert's Tools-tab state. */
     public function testNodeCopyFollowsLitDiviInsert(): void
     {
diff --git a/tests/Unit/Integrations/Divi/ThemeBuilder/TbListAbilityTest.php b/tests/Unit/Integrations/Divi/ThemeBuilder/TbListAbilityTest.php
new file mode 100644
index 0000000..5aafd71
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/ThemeBuilder/TbListAbilityTest.php
@@ -0,0 +1,179 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\ThemeBuilder;
+
+use Brain\Monkey\Functions;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\DiviThemeBuilder;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\TbListAbility;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\TemplateConditions;
+use LIT\MCP\Tests\Support\LibraryFixtures;
+use LIT\MCP\Tests\Support\ThemeBuilderFixtures;
+use LIT\MCP\Tests\Unit\TestCase;
+
+final class TbListAbilityTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+        LibraryFixtures::given([]);
+        Functions\when('get_the_title')->alias(static fn (int $id): string => '[Fixture] Layout ' . $id);
+    }
+
+    /** @param list<string> $deniedRoles */
+    private static function ability(DiviThemeBuilder $store, array $deniedRoles = [], bool $visible = true): TbListAbility
+    {
+        return new TbListAbility(
+            ThemeBuilderFixtures::access($deniedRoles, true, $store, $visible),
+            new TemplateConditions($store)
+        );
+    }
+
+    /** @param list<int> $notEditable Post IDs without edit_post. */
+    private static function denyEditing(array $notEditable): void
+    {
+        Functions\when('current_user_can')->alias(
+            static fn (string $cap, mixed ...$args): bool => ! ($cap === 'edit_post'
+                && in_array((int) ($args[0] ?? 0), $notEditable, true))
+        );
+    }
+
+    public function testListsTemplatesWithLayoutsAndLabels(): void
+    {
+        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1065), ThemeBuilderFixtures::template(1066)]);
+
+        $result = self::ability($store)->execute([]);
+
+        self::assertSame(1064, $result['theme_builder_id']);
+        self::assertFalse($result['draft_pending']);
+        self::assertSame([1065, 1066], array_column($result['templates'], 'id'));
+        $template = $result['templates'][1];
+        self::assertFalse($template['enabled']);
+        self::assertFalse($template['live']);
+        self::assertSame(ThemeBuilderFixtures::template(1066)->rev(), $template['template_rev']);
+        self::assertSame(['Bestimmte Seiten: 1053'], $template['use_on_labels']);
+        self::assertSame([], $template['exclude_from_labels']);
+        self::assertSame('[Fixture] Layout 1062', $template['layouts']['body']['title']);
+        self::assertSame([1065], $template['layouts']['header']['shared_with'], 'the global header');
+        self::assertSame([], $template['layouts']['body']['shared_with']);
+        self::assertSame('', $result['templates'][0]['layouts']['body']['title'], 'no layout');
+        self::assertSame([], $result['detached']);
+        self::assertSame([], $result['notes']);
+        self::assertArrayNotHasKey('conditions', $result);
+    }
+
+    public function testReportsDetachedAndMarkedTemplates(): void
+    {
+        $store = ThemeBuilderFixtures::store(
+            [ThemeBuilderFixtures::template(1065)],
+            0,
+            [ThemeBuilderFixtures::template(1066, ['attached' => false, 'marked_unused' => '2026-09-27 10:00:00'])]
+        );
+
+        $result = self::ability($store)->execute([]);
+
+        self::assertSame([1066], array_column($result['detached'], 'id'));
+        self::assertSame('2026-09-27 10:00:00', $result['detached'][0]['marked_unused']);
+        self::assertFalse($result['detached'][0]['attached']);
+        self::assertSame([1065], $result['detached'][0]['layouts']['header']['shared_with']);
+        self::assertStringContainsString('reattach', implode(' ', $result['notes']));
+        self::assertSame([1066], array_column(self::ability($store)->execute(['template_id' => 1066])['detached'], 'id'));
+    }
+
+    public function testOneTemplateTheDraftAndTheConditionCatalog(): void
+    {
+        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1065), ThemeBuilderFixtures::template(1066)], 999);
+
+        $result = self::ability($store)->execute(['template_id' => 1066, 'conditions' => true]);
+
+        self::assertSame([1066], array_column($result['templates'], 'id'));
+        self::assertTrue($result['draft_pending']);
+        self::assertStringContainsString('Entwurf', implode(' ', $result['notes']));
+        self::assertContains('singular:post_type:lit_person:all', array_column($result['conditions'], 'id'));
+        self::assertToolError(self::ability($store)->execute(['template_id' => 4711]), 'not_found');
+    }
+
+    public function testNeedsTheThemeBuilderRole(): void
+    {
+        $ability = self::ability(ThemeBuilderFixtures::store(), ['theme_builder']);
+
+        self::assertToolError($ability->permission([]), 'forbidden');
+        self::assertToolError($ability->execute([]), 'forbidden');
+        self::assertTrue($ability->annotations()['readonly']);
+        self::assertFalse($ability->isDirect());
+    }
+
+    /** Ruling Q15: without edit_theme_options the Theme Builder is closed. */
+    public function testNeedsEditThemeOptions(): void
+    {
+        LibraryFixtures::given([], ['edit_theme_options']);
+
+        self::assertToolError(self::ability(ThemeBuilderFixtures::store())->execute([]), 'forbidden');
+    }
+
+    /**
+     * Ruling Q8/B11: templates the user may not edit do not appear anywhere – not in the lists, not in
+     * shared_with; asking for one reads exactly like a missing ID (P12).
+     */
+    public function testHidesTemplatesTheUserCannotEdit(): void
+    {
+        self::denyEditing([1065, 1067]);
+        $store = ThemeBuilderFixtures::store(
+            [ThemeBuilderFixtures::template(1065), ThemeBuilderFixtures::template(1066)],
+            0,
+            [ThemeBuilderFixtures::template(1067, ['attached' => false])]
+        );
+
+        $result = self::ability($store)->execute([]);
+
+        self::assertSame([1066], array_column($result['templates'], 'id'));
+        self::assertSame([], $result['detached']);
+        self::assertSame([], $result['templates'][0]['layouts']['header']['shared_with']);
+        self::assertSame([], $result['notes'], 'no hint about hidden detached templates');
+        $encoded = (string) json_encode($result);
+        self::assertStringNotContainsString('1065', $encoded);
+        self::assertStringNotContainsString('1067', $encoded);
+
+        $hidden = self::ability($store)->execute(['template_id' => 1065]);
+        $missing = self::ability($store)->execute(['template_id' => 4711]);
+        self::assertToolError($hidden, 'not_found');
+        self::assertSame(
+            $missing->get_error_message(),
+            str_replace('1065', '4711', $hidden->get_error_message())
+        );
+    }
+
+    /** Ruling Q8/B11: layout titles only for layouts the user may edit. */
+    public function testLayoutTitlesOnlyForEditableLayouts(): void
+    {
+        self::denyEditing([1062]);
+        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1066)]);
+
+        $layouts = self::ability($store)->execute([])['templates'][0]['layouts'];
+
+        self::assertSame('', $layouts['body']['title']);
+        self::assertSame('[Fixture] Layout 1061', $layouts['header']['title']);
+    }
+
+    public function testConditionLabelsNeverNameObjectTitles(): void
+    {
+        Functions\when('get_the_title')->justReturn('Geheime Seite');
+        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1066, [
+            'layouts' => [
+                'header' => ['id' => 0, 'enabled' => true],
+                'body' => ['id' => 0, 'enabled' => true],
+                'footer' => ['id' => 0, 'enabled' => true],
+            ],
+            'exclude_from' => ['singular:post_type:page:children:id:7', 'unbekannt:x'],
+        ])]);
+
+        $result = self::ability($store)->execute([]);
+
+        self::assertSame(
+            ['Unterseiten bestimmter Seiten: 7', 'unbekannt:x'],
+            $result['templates'][0]['exclude_from_labels']
+        );
+        self::assertStringNotContainsString('Geheime Seite', (string) json_encode($result));
+    }
+}