diff --git a/docs/guides/overview.md b/docs/guides/overview.md
index ebe14a2..de64acd 100644
--- a/docs/guides/overview.md
+++ b/docs/guides/overview.md
@@ -21,7 +21,7 @@ Direkt sichtbar: `lit-guide`, `lit-site-status`, `lit-content-types`, `lit-conte
 `lit-content-get`, `lit-content-create`, `lit-content-update`, `lit-post-publish`, `lit-media-search`,
 `lit-media-preview`, `lit-media-download`, `lit-media-upload-from-url`, `lit-page-render-summary`,
 `lit-divi-outline`, `lit-divi-node-get`, `lit-divi-catalog`, `lit-divi-design-system`, `lit-divi-insert`,
-`lit-divi-update`, `lit-divi-move`, `lit-divi-delete`.
+`lit-divi-update`, `lit-divi-move`, `lit-divi-delete`, `lit-library-insert`.
 
 Die Tools sind nach Integration gruppiert (Grundlagen, WordPress, Medien, Divi, Divi-Bibliothek). Jede Gruppe hat unter
 Einstellungen → LIT MCP → Tools eine eigene Einstellung (direkt/indirekt/deaktiviert), die ihre Tools übernehmen
diff --git a/src/Integrations/Divi/DiviIntegration.php b/src/Integrations/Divi/DiviIntegration.php
index 221f67a..82986f1 100644
--- a/src/Integrations/Divi/DiviIntegration.php
+++ b/src/Integrations/Divi/DiviIntegration.php
@@ -116,8 +116,11 @@ final class DiviIntegration implements Integration
         ];
     }
 
-    /** The group "Divi-Bibliothek" (lit/library-*), sharing this integration's library access. */
-    public function library(): LibraryIntegration
+    /**
+     * The group "Divi-Bibliothek" (lit/library-*), sharing this integration's library access;
+     * $diviWritable is whether lit/divi-insert is enabled (lit-library-insert follows it, audit M2).
+     */
+    public function library(?Closure $diviWritable = null): LibraryIntegration
     {
         $loader = $this->loader();
 
@@ -128,7 +131,8 @@ final class DiviIntegration implements Integration
             $this->writer($loader),
             new DiviSaver(),
             $this->log,
-            $this->modules
+            $this->modules,
+            $diviWritable
         );
     }
 
diff --git a/src/Integrations/Divi/Library/LibraryAccess.php b/src/Integrations/Divi/Library/LibraryAccess.php
index 83932b3..271715a 100644
--- a/src/Integrations/Divi/Library/LibraryAccess.php
+++ b/src/Integrations/Divi/Library/LibraryAccess.php
@@ -148,6 +148,16 @@ class LibraryAccess
         return $this->roles->refusal('edit_global_library');
     }
 
+    /**
+     * Inserting from the library into a page (E3): canList(), the role option add_library (Divi's
+     * "Aus der Bibliothek hinzufügen") and a group "Divi-Bibliothek" that is not read-only or
+     * disabled (E9). Reading the entry itself stays item() (ruling P5).
+     */
+    public function canInsert(): ?WP_Error
+    {
+        return $this->canList() ?? $this->roles->refusal('add_library') ?? $this->writableGate();
+    }
+
     /** Refusal while the Tools tab keeps this connection from writing to the library. */
     public function writableGate(): ?WP_Error
     {
diff --git a/src/Integrations/Divi/Library/LibraryInsertAbility.php b/src/Integrations/Divi/Library/LibraryInsertAbility.php
new file mode 100644
index 0000000..08462c8
--- /dev/null
+++ b/src/Integrations/Divi/Library/LibraryInsertAbility.php
@@ -0,0 +1,271 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Library;
+
+use Closure;
+use LIT\MCP\Abilities\Annotations;
+use LIT\MCP\Abilities\Errors;
+use LIT\MCP\Integrations\Divi\BlockTree\Block;
+use LIT\MCP\Integrations\Divi\BlockTree\GlobalInstance;
+use LIT\MCP\Integrations\Divi\BlockTree\LibraryContent;
+use LIT\MCP\Integrations\Divi\BlockTree\MalformedMarkup;
+use LIT\MCP\Integrations\Divi\BlockTree\Parser;
+use LIT\MCP\Integrations\Divi\Pages\DiviChange;
+use LIT\MCP\Integrations\Divi\Pages\DiviComposition;
+use LIT\MCP\Integrations\Divi\Pages\DiviErrors;
+use LIT\MCP\Integrations\Divi\Pages\DiviPage;
+use LIT\MCP\Integrations\Divi\Pages\DiviSchema;
+use LIT\MCP\Integrations\Divi\Pages\DiviWriteAbility;
+use LIT\MCP\Integrations\Divi\Pages\DiviWriter;
+use LIT\MCP\Integrations\WordPress\PostGuard;
+use WP_Error;
+use WP_Post;
+
+defined('ABSPATH') || exit;
+
+/**
+ * lit/library-insert (spec §5.7, E5): a Divi Library entry into a Divi page – as the global instance
+ * the Visual Builder writes (GlobalInstance::of; Divi renders the entry's current content, F7) or
+ * as an independent copy of its roots (a global entry deglobalized like Divi's /load, F10). The
+ * target works like lit-divi-insert (tree_rev lock, StructureRules by effective name, all or
+ * nothing, DiviWriter); the entry is read through LibraryAccess::item() (ruling P5), never nests
+ * instances (ruling P11), and its nodes pass StoredNodeGuard (E6). Needs add_library (E3) and
+ * follows lit-divi-insert's Tools-tab state (audit M2).
+ */
+final class LibraryInsertAbility extends DiviWriteAbility
+{
+    private const MODES = ['copy', 'global'];
+
+    /** @param (Closure(): bool)|null $diviWritable Whether lit/divi-insert is enabled; null = always. */
+    public function __construct(
+        DiviWriter $writer,
+        private LibraryAccess $access,
+        private ?Closure $diviWritable = null,
+        private Parser $parser = new Parser()
+    ) {
+        parent::__construct($writer);
+    }
+
+    public function name(): string
+    {
+        return 'lit/library-insert';
+    }
+
+    public function label(): string
+    {
+        return 'Aus der Divi-Bibliothek einfügen';
+    }
+
+    public function description(): string
+    {
+        return 'Fügt einen Eintrag der Divi-Bibliothek in eine Divi-Seite ein: mode "global" als verknüpfte Instanz '
+            . '(der Inhalt kommt immer aus der Bibliothek; Änderungen dort wirken auf allen Seiten) oder mode "copy" '
+            . 'als unabhängige Kopie. Standard: global für globale Einträge, sonst copy. Einträge über '
+            . 'lit/library-list; Position über parent, before oder after (Pfad-IDs aus lit-divi-outline), sonst ans '
+            . 'Seitenende. tree_rev ist Pflicht; alles oder nichts.';
+    }
+
+    public function inputSchema(): array
+    {
+        return [
+            'type' => 'object',
+            'properties' => array_merge(DiviSchema::write(), [
+                'library_id' => ['type' => 'integer', 'minimum' => 1, 'description' => 'ID aus lit/library-list.'],
+                'mode' => ['type' => 'string', 'enum' => self::MODES],
+            ], DiviSchema::position()),
+            'required' => ['post_id', 'tree_rev', 'library_id'],
+            'additionalProperties' => false,
+        ];
+    }
+
+    public function annotations(): array
+    {
+        return Annotations::write(false);
+    }
+
+    protected function precheck(array $input): ?WP_Error
+    {
+        $refusal = $this->access->canInsert();
+        if ($refusal !== null) {
+            return $refusal;
+        }
+
+        if ($this->diviWritable !== null && ! ($this->diviWritable)()) {
+            return Errors::unsupported(
+                'Divi-Änderungen sind für diese Verbindung abgeschaltet (Gruppe „Divi“ auf „nur lesen“ oder '
+                    . 'lit-divi-insert deaktiviert).',
+                'Einen Administrator fragen: Einstellungen → LIT MCP → Tools.'
+            );
+        }
+
+        return null;
+    }
+
+    protected function change(DiviPage $page, array $input, DiviComposition $composition): DiviChange|WP_Error
+    {
+        $mode = $input['mode'] ?? null;
+        if ($mode !== null && ! in_array($mode, self::MODES, true)) {
+            return Errors::invalidInput('mode ist „copy“ oder „global“; nichts wurde gespeichert.', [
+                'mode' => 'copy oder global',
+            ]);
+        }
+
+        $item = $this->item($input['library_id'] ?? null);
+        if ($item instanceof WP_Error) {
+            return $item;
+        }
+
+        $id = (int) $item->ID;
+        $global = $this->access->isGlobal($item);
+        $mode = is_string($mode) ? $mode : ($global ? 'global' : 'copy');
+        if ($mode === 'global' && ! $global) {
+            return Errors::invalidInput(
+                'Nur globale Bibliothekseinträge lassen sich als Instanz einfügen; nichts wurde gespeichert.',
+                ['mode' => 'der Eintrag ist nicht global – mode "copy" verwenden']
+            );
+        }
+
+        $blocks = $this->blocks($item, $mode === 'global', $global);
+        if ($blocks instanceof WP_Error) {
+            return $blocks;
+        }
+
+        $guard = $composition->storedGuard();
+        foreach ($blocks as $block) {
+            $problems = $guard->problems($block);
+            if ($problems !== []) {
+                return Errors::invalidInput(
+                    'Der Bibliothekseintrag enthält Einstellungen, die nur im Divi-Builder übertragen werden dürfen; '
+                        . 'nichts wurde gespeichert.',
+                    ['library_id' => implode('; ', $problems)]
+                );
+            }
+        }
+
+        $editor = $composition->editor();
+        $position = $editor->position($page->index, $input);
+        if (is_string($position)) {
+            return DiviErrors::position($position);
+        }
+
+        $violation = $editor->insert($position, $blocks);
+        if ($violation !== null) {
+            return Errors::invalidInput(
+                'Der Bibliothekseintrag passt nicht an diese Stelle; nichts wurde gespeichert.',
+                ['library_id' => $violation]
+            );
+        }
+
+        $change = new DiviChange(sprintf(
+            'Bibliothekseintrag „%s“ (%d) %s eingefügt',
+            (string) $item->post_title,
+            $id,
+            $mode === 'global' ? 'als globale Instanz' : 'als Kopie'
+        ));
+        foreach ($blocks as $block) {
+            $change->record($block, 'inserted');
+        }
+        if ($mode === 'global') {
+            $change->warning(sprintf(
+                'Globale Instanz: den Inhalt liefert Bibliothekseintrag %d; Änderungen dort wirken auf alle Seiten mit '
+                    . 'diesem Modul (lit-divi-outline mit post_id %d).',
+                $id,
+                $id
+            ));
+        }
+
+        return $change;
+    }
+
+    /**
+     * The active library entry $libraryId after LibraryAccess' read checks (ruling P5: the library
+     * right and edit_post on the entry), or the refusal. Anything else is not found.
+     */
+    private function item(mixed $libraryId): WP_Post|WP_Error
+    {
+        $id = PostGuard::id($libraryId);
+        if ($id === null) {
+            return Errors::invalidInput('library_id fehlt oder ist keine ID; nichts wurde gespeichert.', [
+                'library_id' => 'ID aus lit/library-list',
+            ]);
+        }
+
+        $item = $this->access->item($id, false);
+        if ($item instanceof WP_Error) {
+            return $item;
+        }
+
+        if (! $item instanceof WP_Post || (string) $item->post_status !== 'publish') {
+            return Errors::notFound(
+                sprintf('Bibliothekseintrag %d gibt es nicht (oder er ist nicht aktiv).', $id),
+                'Einträge mit lit/library-list auflisten.'
+            );
+        }
+
+        return $item;
+    }
+
+    /** @return list<Block>|WP_Error The blocks to insert. */
+    private function blocks(WP_Post $item, bool $instance, bool $global): array|WP_Error
+    {
+        $id = (int) $item->ID;
+        try {
+            $roots = LibraryContent::roots(LibraryContent::load($this->parser, (string) $item->post_content));
+        } catch (MalformedMarkup) {
+            return Errors::unsupported(
+                sprintf('Bibliothekseintrag %d ist kein gültiges Block-Markup; nichts wurde gespeichert.', $id),
+                'Den Eintrag im Divi-Builder öffnen und speichern.'
+            );
+        }
+
+        if ($roots === []) {
+            return Errors::invalidInput(
+                sprintf('Bibliothekseintrag %d ist leer; nichts wurde gespeichert.', $id),
+                ['library_id' => 'leer']
+            );
+        }
+
+        if ($instance) {
+            return $this->instance($roots, $id);
+        }
+
+        return array_map(
+            static fn (Block $root): Block => $global ? GlobalInstance::deglobalize($root->copy()) : $root->copy(),
+            $roots
+        );
+    }
+
+    /**
+     * The one instance of entry $id (GlobalInstance::of). Ruling P11: never nested instances – the
+     * root must be a single readable node holding no global module (Divi forbids nesting, F10).
+     *
+     * @param list<Block> $roots
+     * @return list<Block>|WP_Error
+     */
+    private function instance(array $roots, int $id): array|WP_Error
+    {
+        if (count($roots) !== 1) {
+            return Errors::invalidInput(
+                'Dieser globale Eintrag hat mehrere Wurzeln und lässt sich nur als Kopie einfügen; nichts wurde '
+                    . 'gespeichert.',
+                ['mode' => 'mode "copy" verwenden']
+            );
+        }
+
+        $root = $roots[0];
+        if ($root->isOpaque() || LibraryContent::containsGlobal($root)) {
+            return Errors::invalidInput(
+                sprintf(
+                    'Bibliothekseintrag %d ist selbst ein globales Modul, enthält eines oder ist nicht lesbar; als '
+                        . 'Instanz entstünde eine Verschachtelung, die Divi nicht erlaubt. Nichts wurde gespeichert.',
+                    $id
+                ),
+                ['mode' => 'mode "copy" verwenden oder den Eintrag im Divi-Builder prüfen']
+            );
+        }
+
+        return [GlobalInstance::of($root, $id)];
+    }
+}
diff --git a/src/Integrations/Divi/Library/LibraryIntegration.php b/src/Integrations/Divi/Library/LibraryIntegration.php
index 34dc133..c32fd32 100644
--- a/src/Integrations/Divi/Library/LibraryIntegration.php
+++ b/src/Integrations/Divi/Library/LibraryIntegration.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Integrations\Divi\Library;
 
+use Closure;
 use LIT\MCP\ChangeLog\ChangeLog;
 use LIT\MCP\Integrations\Divi\Design\DesignSystemReader;
 use LIT\MCP\Integrations\Divi\Pages\DiviPageLoader;
@@ -15,13 +16,14 @@ use LIT\MCP\Integrations\Integration;
 defined('ABSPATH') || exit;
 
 /**
- * The group "Divi-Bibliothek" (E9): lit/library-list, lit/library-save, later lit-library-insert.
+ * The group "Divi-Bibliothek" (E9): lit/library-list, lit/library-save and lit-library-insert (direct).
  * Built by DiviIntegration::library() so it shares the library access (rights, Tools-tab gates –
  * its id LibraryAccess::GROUP is what the P9 hiding and the write gate ask). Available with the
  * Divi 5 builder, like the Divi group.
  */
 final class LibraryIntegration implements Integration
 {
+    /** @param (Closure(): bool)|null $diviWritable Whether lit/divi-insert is enabled (audit M2); null = always. */
     public function __construct(
         private LibraryAccess $access,
         private DiviPageLoader $loader,
@@ -29,7 +31,8 @@ final class LibraryIntegration implements Integration
         private DiviWriter $writer,
         private DiviSaver $saver,
         private ChangeLog $log,
-        private DiviModules $modules
+        private DiviModules $modules,
+        private ?Closure $diviWritable = null
     ) {
     }
 
@@ -60,6 +63,7 @@ final class LibraryIntegration implements Integration
                 $this->log,
                 $this->modules
             ),
+            new LibraryInsertAbility($this->writer, $this->access, $this->diviWritable),
         ];
     }
 }
diff --git a/src/Plugin.php b/src/Plugin.php
index 2649e96..e256ff5 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -95,7 +95,7 @@ final class Plugin
             new WordPressIntegration($schema, $changeLog, $divi->contentComposer($diviWritable)),
             new MediaIntegration($schema, $changeLog, $limits),
             $divi,
-            $divi->library()
+            $divi->library($diviWritable)
         );
 
         $policy = ExposurePolicy::fromOption()->withGroups($registry->groupMap(...));
diff --git a/tests/Unit/Integrations/Divi/DiviIntegrationTest.php b/tests/Unit/Integrations/Divi/DiviIntegrationTest.php
index a239cb9..7f6c4a1 100644
--- a/tests/Unit/Integrations/Divi/DiviIntegrationTest.php
+++ b/tests/Unit/Integrations/Divi/DiviIntegrationTest.php
@@ -58,7 +58,7 @@ final class DiviIntegrationTest extends TestCase
         self::assertSame('Divi-Bibliothek', $library->label());
         self::assertFalse($library->isAvailable(), 'no Divi classes in unit tests');
         self::assertSame(
-            ['lit/library-list', 'lit/library-save'],
+            ['lit/library-list', 'lit/library-save', 'lit/library-insert'],
             array_map(static fn (Ability $ability): string => $ability->name(), $library->abilities())
         );
         foreach ($library->abilities() as $ability) {
diff --git a/tests/Unit/Integrations/Divi/Library/LibraryAccessTest.php b/tests/Unit/Integrations/Divi/Library/LibraryAccessTest.php
index 2e425a0..3044039 100644
--- a/tests/Unit/Integrations/Divi/Library/LibraryAccessTest.php
+++ b/tests/Unit/Integrations/Divi/Library/LibraryAccessTest.php
@@ -166,4 +166,18 @@ final class LibraryAccessTest extends TestCase
         self::assertToolError(LibraryFixtures::access(['edit_global_library'])->canSave(true), 'forbidden');
         self::assertNull(LibraryFixtures::access()->canSave(true));
     }
+
+    /** Inserting from the library (E3): canList(), Divi's add_library and a group that is not read-only. */
+    public function testInsertingNeedsAddLibrary(): void
+    {
+        LibraryFixtures::given([]);
+
+        self::assertNull(LibraryFixtures::access()->canInsert());
+        self::assertToolError(LibraryFixtures::access(['add_library'])->canInsert(), 'forbidden');
+        self::assertToolError(LibraryFixtures::access(['divi_library'])->canInsert(), 'forbidden');
+        self::assertToolError(LibraryFixtures::access([], false)->canInsert(), 'forbidden');
+
+        LibraryFixtures::given([], ['edit_posts']);
+        self::assertToolError(LibraryFixtures::access()->canInsert(), 'forbidden');
+    }
 }
diff --git a/tests/Unit/Integrations/Divi/Library/LibraryInsertAbilityTest.php b/tests/Unit/Integrations/Divi/Library/LibraryInsertAbilityTest.php
new file mode 100644
index 0000000..613ce6e
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Library/LibraryInsertAbilityTest.php
@@ -0,0 +1,269 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Library;
+
+use Brain\Monkey\Functions;
+use LIT\MCP\Abilities\Rev;
+use LIT\MCP\Integrations\Divi\Library\LibraryInsertAbility;
+use LIT\MCP\Tests\Support\DiviFixtures;
+use LIT\MCP\Tests\Support\DiviWriterFixture;
+use LIT\MCP\Tests\Support\LibraryFixtures;
+use LIT\MCP\Tests\Unit\TestCase;
+use WP_Post;
+
+final class LibraryInsertAbilityTest extends TestCase
+{
+    private WP_Post $page;
+
+    /** @var list<string> */
+    private array $saved = [];
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->page = LibraryFixtures::page(DiviFixtures::markup('synthetic-basic.html'));
+        LibraryFixtures::given(array_merge(
+            [$this->page],
+            array_map(static fn (int $id): WP_Post => LibraryFixtures::item($id), array_keys(LibraryFixtures::ITEMS))
+        ));
+    }
+
+    /** @param list<string> $deniedRoles */
+    private function ability(array $deniedRoles = [], bool $diviWritable = true, bool $unfiltered = false): LibraryInsertAbility
+    {
+        $access = LibraryFixtures::access($deniedRoles);
+        $failures = [];
+
+        return new LibraryInsertAbility(
+            DiviWriterFixture::writer($this->saved, $failures, $unfiltered, LibraryFixtures::loader($access)),
+            $access,
+            static fn (): bool => $diviWritable
+        );
+    }
+
+    /**
+     * @param array<string, mixed> $extra
+     * @return array<string, mixed>
+     */
+    private function input(array $extra): array
+    {
+        return array_merge(['post_id' => 7, 'tree_rev' => Rev::of((string) $this->page->post_content)], $extra);
+    }
+
+    private static function fixtureInstance(int $id, string $end): string
+    {
+        $page = DiviFixtures::markup('stage3/page--globale-instanzen.html');
+        $start = (int) strpos($page, '<!-- wp:divi/global-layout {"globalModule":"' . $id . '"');
+
+        return substr($page, $start, (int) strpos($page, $end, $start) + strlen($end) - $start);
+    }
+
+    /** Replaces library entry $id by one with $content (still global/normal as in ITEMS). */
+    private function givenItem(int $id, string $content, array $fields = []): void
+    {
+        LibraryFixtures::given([
+            $this->page,
+            LibraryFixtures::item($id, array_merge(['post_content' => $content], $fields)),
+        ]);
+    }
+
+    public function testInsertsAGlobalSectionExactlyLikeTheBuilder(): void
+    {
+        $result = $this->ability()->execute($this->input(['library_id' => 1058, 'after' => 's0']));
+
+        self::assertTrue($result['ok']);
+        self::assertStringContainsString(self::fixtureInstance(1058, '<!-- /wp:divi/global-layout -->'), $this->saved[0]);
+        self::assertSame('g0', $result['changed'][0]['id']);
+        self::assertStringContainsString('Bibliothekseintrag 1058', implode(' ', $result['warnings']));
+    }
+
+    public function testInsertsAGlobalModuleIntoAColumn(): void
+    {
+        $result = $this->ability()->execute($this->input(['library_id' => 1059, 'parent' => 's0.r0.c1']));
+
+        self::assertTrue($result['ok']);
+        self::assertStringContainsString(self::fixtureInstance(1059, '/-->'), $this->saved[0]);
+    }
+
+    public function testUntouchedContentKeepsItsBytes(): void
+    {
+        $before = (string) $this->page->post_content;
+
+        $this->ability()->execute($this->input(['library_id' => 1059, 'parent' => 's0.r0.c1']));
+
+        $instance = self::fixtureInstance(1059, '/-->');
+        $at = (int) strpos($this->saved[0], $instance);
+        self::assertSame($before, substr($this->saved[0], 0, $at) . substr($this->saved[0], $at + strlen($instance)));
+    }
+
+    public function testCopyInsertsTheRootsWithoutFrameAndCrlf(): void
+    {
+        $result = $this->ability()->execute($this->input(['library_id' => 1055]));
+
+        $section = str_replace(
+            ['<!-- wp:divi/placeholder -->', '<!-- /wp:divi/placeholder -->', "\r\n"],
+            ['', '', "\n"],
+            DiviFixtures::markup('stage3/library--library-abschnitt.html')
+        );
+        self::assertTrue($result['ok']);
+        self::assertStringContainsString($section, $this->saved[0]);
+        self::assertStringNotContainsString("\r", $this->saved[0]);
+    }
+
+    public function testLayoutCopyInsertsEverySection(): void
+    {
+        $result = $this->ability()->execute($this->input(['library_id' => 1054, 'mode' => 'copy']));
+
+        self::assertCount(3, $result['changed']);
+        self::assertStringContainsString('Library-Blurb', $this->saved[0]);
+    }
+
+    /** F10: a copy of a global entry is deglobalized like Divi's /load – its root bytes, no globalParent. */
+    public function testCopyOfAGlobalEntryIsItsPlainRoot(): void
+    {
+        $result = $this->ability()->execute($this->input(['library_id' => 1058, 'mode' => 'copy']));
+
+        $section = str_replace(
+            ['<!-- wp:divi/placeholder -->', '<!-- /wp:divi/placeholder -->', "\r\n"],
+            ['', '', "\n"],
+            DiviFixtures::markup('stage3/library-global--globaler-abschnitt.html')
+        );
+        self::assertTrue($result['ok']);
+        self::assertStringContainsString($section, $this->saved[0]);
+        self::assertStringNotContainsString('globalParent', $this->saved[0]);
+        self::assertStringNotContainsString('global-layout', $this->saved[0]);
+        self::assertSame([], $result['warnings']);
+    }
+
+    /** F10: nested instances in a (stored) global entry become plain nodes in the copy. */
+    public function testCopyDeglobalizesNestedInstances(): void
+    {
+        $instance = self::fixtureInstance(1059, '/-->');
+        $this->givenItem(1058, '<!-- wp:divi/placeholder --><!-- wp:divi/section {"builderVersion":"5.2.1"} -->'
+            . '<!-- wp:divi/row {"builderVersion":"5.2.1"} --><!-- wp:divi/column {"builderVersion":"5.2.1"} -->'
+            . $instance . '<!-- /wp:divi/column --><!-- /wp:divi/row --><!-- /wp:divi/section -->'
+            . '<!-- /wp:divi/placeholder -->');
+
+        $result = $this->ability()->execute($this->input(['library_id' => 1058, 'mode' => 'copy']));
+
+        self::assertTrue($result['ok']);
+        self::assertStringNotContainsString('globalModule', $this->saved[0]);
+        self::assertStringContainsString('<!-- wp:divi/text {"builderVersion":"5.2.1","content"', $this->saved[0]);
+    }
+
+    /** Ruling P11: never an instance of an entry whose root is (or holds) an instance or is unreadable. */
+    public function testNoNestedInstances(): void
+    {
+        $instance = self::fixtureInstance(1059, '/-->');
+        foreach (
+            [
+                '<!-- wp:divi/placeholder -->' . $instance . '<!-- /wp:divi/placeholder -->',
+                '<!-- wp:divi/placeholder --><!-- wp:divi/section {"builderVersion":"5.2.1"} -->'
+                    . '<!-- wp:divi/row {"builderVersion":"5.2.1"} --><!-- wp:divi/column {"builderVersion":"5.2.1"} -->'
+                    . $instance . '<!-- /wp:divi/column --><!-- /wp:divi/row --><!-- /wp:divi/section -->'
+                    . '<!-- /wp:divi/placeholder -->',
+                '<!-- wp:divi/placeholder --><!-- wp:divi/text {"globalModule":"1057"} /--><!-- /wp:divi/placeholder -->',
+                '<!-- wp:divi/placeholder --><!-- wp:divi/text {"a":1,} /--><!-- /wp:divi/placeholder -->',
+            ] as $content
+        ) {
+            $this->givenItem(1059, $content);
+
+            $result = $this->ability([], true, true)->execute($this->input(['library_id' => 1059]));
+
+            self::assertToolError($result, 'validation_failed');
+            self::assertStringContainsString('Verschachtelung', $result->get_error_message());
+        }
+        self::assertSame([], $this->saved);
+    }
+
+    public function testGlobalModeNeedsAGlobalEntryAndUnknownEntriesAreNotFound(): void
+    {
+        self::assertToolError($this->ability()->execute($this->input(['library_id' => 1055, 'mode' => 'global'])), 'validation_failed');
+        self::assertToolError($this->ability()->execute($this->input(['library_id' => 9999])), 'not_found');
+        self::assertToolError($this->ability()->execute($this->input(['library_id' => 7])), 'not_found');
+        self::assertToolError($this->ability()->execute($this->input(['library_id' => 1055, 'mode' => 'link'])), 'validation_failed');
+        self::assertSame([], $this->saved);
+    }
+
+    public function testATrashedEntryIsNotFound(): void
+    {
+        $this->givenItem(1055, DiviFixtures::markup('stage3/library--library-abschnitt.html'), ['post_status' => 'trash']);
+
+        self::assertToolError($this->ability()->execute($this->input(['library_id' => 1055])), 'not_found');
+        self::assertSame([], $this->saved);
+    }
+
+    /** Ruling P5: the entry is read through LibraryAccess – edit_post on it, not read_post. */
+    public function testNeedsEditPostOnTheEntry(): void
+    {
+        Functions\when('current_user_can')->alias(
+            static fn (string $cap, mixed ...$args): bool => ! ($cap === 'edit_post' && (int) ($args[0] ?? 0) === 1058)
+        );
+
+        $result = $this->ability()->execute($this->input(['library_id' => 1058]));
+
+        self::assertToolError($result, 'forbidden');
+        self::assertStringNotContainsString('[Fixture]', $result->get_error_message());
+        self::assertSame([], $this->saved);
+    }
+
+    public function testNeedsAddLibraryAndAWritableDiviGroup(): void
+    {
+        self::assertToolError($this->ability(['add_library'])->permission($this->input(['library_id' => 1058])), 'forbidden');
+        self::assertToolError($this->ability(['add_library'])->execute($this->input(['library_id' => 1058])), 'forbidden');
+        self::assertToolError($this->ability([], false)->permission($this->input(['library_id' => 1058])), 'unsupported');
+        self::assertToolError($this->ability([], false)->execute($this->input(['library_id' => 1058])), 'unsupported');
+        self::assertTrue($this->ability()->permission($this->input(['library_id' => 1058])));
+        self::assertTrue($this->ability()->isDirect());
+        self::assertSame([], $this->saved);
+    }
+
+    public function testTheTargetKeepsTheTreeRevLockAndStructureRules(): void
+    {
+        self::assertToolError(
+            $this->ability()->execute(['post_id' => 7, 'tree_rev' => 'alt', 'library_id' => 1058]),
+            'rev_mismatch'
+        );
+        self::assertToolError(
+            $this->ability()->execute($this->input(['library_id' => 1058, 'parent' => 's0.r0.c1'])),
+            'validation_failed'
+        );
+        self::assertToolError(
+            $this->ability()->execute($this->input(['library_id' => 1059, 'parent' => 's9'])),
+            'validation_failed'
+        );
+        self::assertSame([], $this->saved);
+    }
+
+    public function testEditorCannotInsertAnItemWithCustomCss(): void
+    {
+        $custom = LibraryFixtures::item(1055, [
+            'ID' => 1080,
+            'post_content' => '<!-- wp:divi/placeholder --><!-- wp:divi/section {"css":{"desktop":{"value":'
+                . '{"freeForm":"body{display:none}"}}}} --><!-- /wp:divi/section --><!-- /wp:divi/placeholder -->',
+        ]);
+        LibraryFixtures::given([$this->page, $custom]);
+
+        $result = $this->ability()->execute($this->input(['library_id' => 1080]));
+
+        self::assertToolError($result, 'validation_failed');
+        self::assertSame([], $this->saved);
+    }
+
+    public function testAdminMayInsertAnItemWithCustomCss(): void
+    {
+        $custom = LibraryFixtures::item(1055, [
+            'ID' => 1080,
+            'post_content' => '<!-- wp:divi/placeholder --><!-- wp:divi/section {"css":{"desktop":{"value":'
+                . '{"freeForm":"body{display:none}"}}}} --><!-- /wp:divi/section --><!-- /wp:divi/placeholder -->',
+        ]);
+        LibraryFixtures::given([$this->page, $custom]);
+
+        $result = $this->ability([], true, true)->execute($this->input(['library_id' => 1080]));
+
+        self::assertTrue($result['ok']);
+        self::assertStringContainsString('body{display:none}', $this->saved[0]);
+    }
+}