diff --git a/src/Integrations/Divi/Library/DiviLibraryStore.php b/src/Integrations/Divi/Library/DiviLibraryStore.php
index 7da3e2b..d39c65d 100644
--- a/src/Integrations/Divi/Library/DiviLibraryStore.php
+++ b/src/Integrations/Divi/Library/DiviLibraryStore.php
@@ -5,6 +5,10 @@ declare(strict_types=1);
 namespace LIT\MCP\Integrations\Divi\Library;
 
 use LIT\MCP\Abilities\WriteFailed;
+use LIT\MCP\Integrations\Divi\Release\Call;
+use LIT\MCP\Integrations\Divi\Release\DiviAdapter;
+use LIT\MCP\Integrations\Divi\Release\Manifest;
+use LIT\MCP\Integrations\Divi\Release\Mirror;
 use LIT\MCP\Integrations\WordPress\Content\NewDraft;
 use RuntimeException;
 use Throwable;
@@ -15,15 +19,15 @@ 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
+ * Adapter "Bibliothek" (spec §3) for the Divi Library (E4, E15): post type et_pb_layout, the taxonomies scope,
+ * layout_type, module_width, layout_category, layout_tag and the terms and meta Divi's et_pb_submit_layout() writes
+ * (mirror library-submit-layout: metaFor()) (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
+class DiviLibraryStore implements DiviAdapter
 {
     public const POST_TYPE = 'et_pb_layout';
 
@@ -34,9 +38,67 @@ class DiviLibraryStore
     /** Taxonomies every new entry needs (et_pb_submit_layout). */
     public const TAXONOMIES = ['scope', 'layout_type', 'module_width'];
 
+    public const MODULE_TYPE = '_et_pb_module_type';
+
+    public const EXCLUDED_OPTIONS = '_et_pb_excluded_global_options';
+
+    public const BUILT_FOR = '_et_pb_built_for_post_type';
+
+    public const TEMPLATE_TYPE = '_et_pb_template_type';
+
     /** Client text when the terms or meta of a new entry could not be written. */
     public const REASON_CREATE = 'Der Bibliothekseintrag konnte nicht vollständig angelegt werden.';
 
+    public static function manifest(): Manifest
+    {
+        return new Manifest(
+            Manifest::LIBRARY,
+            calls: [new Call(self::GLOBAL_LAYOUT . '::is_global_layout_template', 1)],
+            postTypes: [self::POST_TYPE],
+            taxonomies: [...self::TAXONOMIES, 'layout_category', 'layout_tag'],
+            keys: [self::MODULE_TYPE, self::EXCLUDED_OPTIONS, self::BUILT_FOR, self::TEMPLATE_TYPE],
+            mirrors: [
+                new Mirror(
+                    'library-submit-layout',
+                    'includes/builder/shortcode-core.php',
+                    'et_pb_submit_layout',
+                    null,
+                    'Terme und Meta neuer Bibliothekseinträge (scope, layout_type, module_width, _et_pb_module_type, '
+                        . '_et_pb_excluded_global_options, _et_pb_built_for_post_type, _et_pb_template_type)'
+                ),
+            ]
+        );
+    }
+
+    /**
+     * The meta of a new entry as et_pb_submit_layout() writes it (compared with the real builder entries, fixtures
+     * stage3): _et_pb_module_type (modules), _et_pb_excluded_global_options = "[]" (global modules),
+     * _et_pb_built_for_post_type, _et_pb_template_type. _et_pb_row_layout is left out – Divi 5.2.1 stores
+     * "[object Object]" there (finding 5).
+     *
+     * @return array<string, string>
+     */
+    public static function metaFor(LibraryItemSpec $spec): array
+    {
+        $meta = [];
+        if ($spec->moduleType !== null) {
+            $meta[self::MODULE_TYPE] = $spec->moduleType;
+        }
+        if ($spec->global && $spec->layoutType === 'module') {
+            $meta[self::EXCLUDED_OPTIONS] = '[]';
+        }
+        $meta[self::BUILT_FOR] = $spec->builtFor;
+        $meta[self::TEMPLATE_TYPE] = $spec->layoutType;
+
+        return $meta;
+    }
+
+    /** _et_pb_built_for_post_type of entry $id ('' when unset): the type an entry was built for. */
+    public static function builtFor(int $id): string
+    {
+        return (string) get_post_meta($id, self::BUILT_FOR, true);
+    }
+
     public function isGlobal(int $id): bool
     {
         if (method_exists(self::GLOBAL_LAYOUT, 'is_global_layout_template')) {
@@ -127,7 +189,7 @@ class DiviLibraryStore
     public function describe(WP_Post $post): array
     {
         $id = (int) $post->ID;
-        $moduleType = (string) get_post_meta($id, '_et_pb_module_type', true);
+        $moduleType = (string) get_post_meta($id, self::MODULE_TYPE, true);
 
         return [
             'id' => $id,
@@ -209,7 +271,7 @@ class DiviLibraryStore
                 throw new RuntimeException(sprintf('terms %s: %s', $taxonomy, $result->get_error_message()));
             }
         }
-        foreach ($spec->meta() as $key => $value) {
+        foreach (self::metaFor($spec) as $key => $value) {
             update_post_meta($id, $key, $value);
             if ((string) get_post_meta($id, $key, true) !== $value) {
                 throw new RuntimeException(sprintf('meta %s of library entry %d not stored', $key, $id));
diff --git a/src/Integrations/Divi/Library/DiviRoles.php b/src/Integrations/Divi/Library/DiviRoles.php
index a28c9f0..97090a0 100644
--- a/src/Integrations/Divi/Library/DiviRoles.php
+++ b/src/Integrations/Divi/Library/DiviRoles.php
@@ -6,18 +6,21 @@ namespace LIT\MCP\Integrations\Divi\Library;
 
 use Closure;
 use LIT\MCP\Abilities\Errors;
+use LIT\MCP\Integrations\Divi\Release\Call;
+use LIT\MCP\Integrations\Divi\Release\DiviAdapter;
+use LIT\MCP\Integrations\Divi\Release\Manifest;
 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)
+ * Adapter "Bibliothek" (spec §3) for Divi's role editor (E3, E15): et_pb_is_allowed() (Divi's builder/core.php)
  * 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
+class DiviRoles implements DiviAdapter
 {
     private const LABELS = [
         'divi_library' => 'Divi-Bibliothek',
@@ -28,6 +31,11 @@ class DiviRoles
         'theme_builder' => 'Theme Builder',
     ];
 
+    public static function manifest(): Manifest
+    {
+        return new Manifest(Manifest::LIBRARY, calls: [new Call('et_pb_is_allowed', 1)]);
+    }
+
     /** @param (Closure(string): bool)|null $check Test seam; null = Divi's et_pb_is_allowed(). */
     public function __construct(private ?Closure $check = null)
     {
diff --git a/src/Integrations/Divi/Library/LibraryItemSpec.php b/src/Integrations/Divi/Library/LibraryItemSpec.php
index e5fa4c8..4ea6edc 100644
--- a/src/Integrations/Divi/Library/LibraryItemSpec.php
+++ b/src/Integrations/Divi/Library/LibraryItemSpec.php
@@ -13,12 +13,9 @@ use LIT\MCP\Integrations\Divi\Schema\ModuleCatalog;
 defined('ABSPATH') || exit;
 
 /**
- * Title, terms and meta of a new library entry, like Divi's et_pb_submit_layout() writes them
- * (builder/shortcode-core.php:654-734; compared with the real builder entries, fixtures stage3):
- * terms scope (global / non_global), layout_type, module_width, optional layout_category/layout_tag;
- * meta _et_pb_module_type (modules), _et_pb_excluded_global_options = "[]" (global modules),
- * _et_pb_built_for_post_type, _et_pb_template_type. _et_pb_row_layout is left out – Divi 5.2.1 stores
- * "[object Object]" there (finding 5). Pure PHP.
+ * Title and terms of a new library entry, like Divi's et_pb_submit_layout() writes them (compared with the real
+ * builder entries, fixtures stage3): terms scope (global / non_global), layout_type, module_width, optional
+ * layout_category/layout_tag. The meta follows from DiviLibraryStore::metaFor(). Pure PHP.
  */
 final class LibraryItemSpec
 {
@@ -129,20 +126,4 @@ final class LibraryItemSpec
 
         return $terms;
     }
-
-    /** @return array<string, string> */
-    public function meta(): array
-    {
-        $meta = [];
-        if ($this->moduleType !== null) {
-            $meta['_et_pb_module_type'] = $this->moduleType;
-        }
-        if ($this->global && $this->layoutType === 'module') {
-            $meta['_et_pb_excluded_global_options'] = '[]';
-        }
-        $meta['_et_pb_built_for_post_type'] = $this->builtFor;
-        $meta['_et_pb_template_type'] = $this->layoutType;
-
-        return $meta;
-    }
 }
diff --git a/src/Integrations/Divi/Library/NewLibraryEntry.php b/src/Integrations/Divi/Library/NewLibraryEntry.php
index ee27b5d..70f04cd 100644
--- a/src/Integrations/Divi/Library/NewLibraryEntry.php
+++ b/src/Integrations/Divi/Library/NewLibraryEntry.php
@@ -127,7 +127,7 @@ final class NewLibraryEntry
             return (string) $page->post->post_type;
         }
 
-        $builtFor = (string) get_post_meta((int) $page->post->ID, '_et_pb_built_for_post_type', true);
+        $builtFor = DiviLibraryStore::builtFor((int) $page->post->ID);
 
         return $builtFor !== '' ? $builtFor : 'page';
     }
diff --git a/src/Integrations/Divi/Release/DiviAdapters.php b/src/Integrations/Divi/Release/DiviAdapters.php
index 69bd9c8..661cb54 100644
--- a/src/Integrations/Divi/Release/DiviAdapters.php
+++ b/src/Integrations/Divi/Release/DiviAdapters.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Integrations\Divi\Release;
 
+use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
+use LIT\MCP\Integrations\Divi\Library\DiviRoles;
 use LIT\MCP\Integrations\Divi\Pages\DiviPages;
 use LIT\MCP\Integrations\Divi\Pages\DynamicContentMap;
 use LIT\MCP\Integrations\Divi\Schema\DiviModules;
@@ -16,6 +18,8 @@ final class DiviAdapters
     /** @var list<class-string<DiviAdapter>> */
     public const CLASSES = [
         DiviPages::class,
+        DiviLibraryStore::class,
+        DiviRoles::class,
         DiviModules::class,
         DynamicContentMap::class,
     ];
diff --git a/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php b/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php
index a14d665..8490011 100644
--- a/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php
+++ b/tests/Unit/Integrations/Divi/Library/DiviLibraryStoreTest.php
@@ -8,6 +8,8 @@ use Brain\Monkey\Functions;
 use LIT\MCP\Abilities\WriteFailed;
 use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
 use LIT\MCP\Integrations\Divi\Library\LibraryItemSpec;
+use LIT\MCP\Integrations\Divi\Release\DiviAdapters;
+use LIT\MCP\Integrations\Divi\Release\Manifest;
 use LIT\MCP\Integrations\WordPress\Content\NewDraft;
 use LIT\MCP\Tests\Support\FakeChangeLog;
 use LIT\MCP\Tests\Unit\TestCase;
@@ -114,6 +116,32 @@ final class DiviLibraryStoreTest extends TestCase
         self::assertSame(12, $captured['author']);
     }
 
+    public function testIsTheRegisteredLibraryAdapterWithTheSubmitLayoutMirror(): void
+    {
+        $manifest = DiviLibraryStore::manifest();
+
+        self::assertContains(DiviLibraryStore::class, DiviAdapters::CLASSES);
+        self::assertSame(Manifest::LIBRARY, $manifest->area);
+        self::assertSame(['et_pb_layout'], $manifest->postTypes);
+        self::assertSame(
+            ['scope', 'layout_type', 'module_width', 'layout_category', 'layout_tag'],
+            $manifest->taxonomies
+        );
+        self::assertSame(['library-submit-layout'], array_map(static fn ($m): string => $m->id, $manifest->mirrors));
+        self::assertSame('et_pb_submit_layout()', $manifest->mirrors[0]->label());
+    }
+
+    public function testBuiltForReadsTheSourceType(): void
+    {
+        Functions\when('get_post_meta')->alias(
+            static fn (int $id, string $key): string => $id === 1054
+                && $key === '_et_pb_built_for_post_type' ? 'post' : ''
+        );
+
+        self::assertSame('post', DiviLibraryStore::builtFor(1054));
+        self::assertSame('', DiviLibraryStore::builtFor(1055));
+    }
+
     public function testReportsMissingTaxonomies(): void
     {
         Functions\when('taxonomy_exists')->alias(static fn (string $taxonomy): bool => $taxonomy !== 'scope');
diff --git a/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php b/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php
index 876e5cf..330e879 100644
--- a/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php
+++ b/tests/Unit/Integrations/Divi/Library/DiviRolesTest.php
@@ -26,4 +26,10 @@ final class DiviRolesTest extends TestCase
         // Unit tests have no et_pb_is_allowed(): a missing Divi function never means "allowed".
         self::assertFalse((new DiviRoles())->allows('divi_library'));
     }
+
+    public function testIsTheRegisteredRolesAdapter(): void
+    {
+        self::assertContains(DiviRoles::class, \LIT\MCP\Integrations\Divi\Release\DiviAdapters::CLASSES);
+        self::assertSame('et_pb_is_allowed()', DiviRoles::manifest()->calls[0]->label());
+    }
 }
diff --git a/tests/Unit/Integrations/Divi/Library/LibraryItemSpecTest.php b/tests/Unit/Integrations/Divi/Library/LibraryItemSpecTest.php
index 44d2b20..5bee53a 100644
--- a/tests/Unit/Integrations/Divi/Library/LibraryItemSpecTest.php
+++ b/tests/Unit/Integrations/Divi/Library/LibraryItemSpecTest.php
@@ -8,6 +8,7 @@ use LIT\MCP\Integrations\Divi\BlockTree\Block;
 use LIT\MCP\Integrations\Divi\BlockTree\LibraryContent;
 use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
 use LIT\MCP\Integrations\Divi\BlockTree\Parser;
+use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
 use LIT\MCP\Integrations\Divi\Library\LibraryItemSpec;
 use LIT\MCP\Tests\Support\DiviFixtures;
 use PHPUnit\Framework\TestCase;
@@ -60,7 +61,7 @@ final class LibraryItemSpecTest extends TestCase
         self::assertEquals($expectedTerms, $spec->terms());
         $expectedMeta = array_map(static fn (array $values): string => $values[0], $json['meta']);
         unset($expectedMeta['_et_pb_row_layout']);
-        self::assertEquals($expectedMeta, $spec->meta());
+        self::assertEquals($expectedMeta, DiviLibraryStore::metaFor($spec));
     }
 
     public function testRefusesInstancesColumnsAndGlobalsInsideGlobals(): void
diff --git a/tests/Unit/Integrations/Divi/Library/LibrarySaveAbilityTest.php b/tests/Unit/Integrations/Divi/Library/LibrarySaveAbilityTest.php
index 65983b8..5fca4c3 100644
--- a/tests/Unit/Integrations/Divi/Library/LibrarySaveAbilityTest.php
+++ b/tests/Unit/Integrations/Divi/Library/LibrarySaveAbilityTest.php
@@ -7,6 +7,7 @@ namespace LIT\MCP\Tests\Unit\Integrations\Divi\Library;
 use Brain\Monkey\Functions;
 use LIT\MCP\Abilities\Rev;
 use LIT\MCP\Abilities\WriteFailed;
+use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
 use LIT\MCP\Integrations\Divi\Library\LibraryItemSpec;
 use LIT\MCP\Integrations\Divi\Library\LibrarySaveAbility;
 use LIT\MCP\Integrations\Divi\Pages\DiviSaver;
@@ -112,8 +113,8 @@ final class LibrarySaveAbilityTest extends TestCase
 
         self::assertTrue($result['ok']);
         self::assertTrue($this->specs[0]->global);
-        self::assertSame('divi/button', $this->specs[0]->meta()['_et_pb_module_type']);
-        self::assertSame('[]', $this->specs[0]->meta()['_et_pb_excluded_global_options']);
+        self::assertSame('divi/button', DiviLibraryStore::metaFor($this->specs[0])['_et_pb_module_type']);
+        self::assertSame('[]', DiviLibraryStore::metaFor($this->specs[0])['_et_pb_excluded_global_options']);
     }
 
     public function testRefusesAGlobalInstanceAndColumnsAndCreatesNothing(): void
diff --git a/tests/Unit/Integrations/Divi/Release/DiviBoundaryTest.php b/tests/Unit/Integrations/Divi/Release/DiviBoundaryTest.php
index 20b6b92..5fb5a40 100644
--- a/tests/Unit/Integrations/Divi/Release/DiviBoundaryTest.php
+++ b/tests/Unit/Integrations/Divi/Release/DiviBoundaryTest.php
@@ -26,10 +26,6 @@ final class DiviBoundaryTest extends TestCase
     private const LEGACY = [
         'Integrations/Divi/Design/DesignSystemReader.php',
         'Integrations/Divi/DiviCompatibility.php',
-        'Integrations/Divi/Library/DiviLibraryStore.php',
-        'Integrations/Divi/Library/DiviRoles.php',
-        'Integrations/Divi/Library/LibraryItemSpec.php',
-        'Integrations/Divi/Library/NewLibraryEntry.php',
         'Integrations/Divi/ThemeBuilder/DiviThemeBuilder.php',
         'Integrations/Media/MediaUsageFinder.php',
     ];