diff --git a/src/Abilities/AbilityRegistrar.php b/src/Abilities/AbilityRegistrar.php
index be1352e..37e7ca8 100644
--- a/src/Abilities/AbilityRegistrar.php
+++ b/src/Abilities/AbilityRegistrar.php
@@ -5,6 +5,8 @@ declare(strict_types=1);
 namespace LIT\MCP\Abilities;
 
 use LIT\MCP\Access;
+use LIT\MCP\Integrations\Divi\Release\DiviLocked;
+use LIT\MCP\Integrations\Divi\Release\DiviToolGate;
 use LIT\MCP\Integrations\IntegrationRegistry;
 use LIT\MCP\Log;
 use LIT\MCP\Server\RequestContext;
@@ -14,15 +16,18 @@ use WP_Error;
 defined('ABSPATH') || exit;
 
 /**
- * Registers all abilities of available integrations with the Abilities API and
- * wraps them with the role gate and neutral error handling.
+ * Registers all abilities of available integrations with the Abilities API and wraps them
+ * with the role gate, the Divi release lock (DiviToolGate) and neutral error handling.
  */
 final class AbilityRegistrar
 {
     public const CATEGORY = 'lit-mcp';
 
-    public function __construct(private IntegrationRegistry $registry, private ?ExposurePolicy $policy = null)
-    {
+    public function __construct(
+        private IntegrationRegistry $registry,
+        private ?ExposurePolicy $policy = null,
+        private ?DiviToolGate $divi = null
+    ) {
     }
 
     public function register(): void
@@ -50,6 +55,7 @@ final class AbilityRegistrar
     /** @return array<string, mixed> */
     public function argsFor(Ability $ability): array
     {
+        $divi = $this->divi ?? new DiviToolGate($this->registry->groupMap(...));
         $args = [
             'label' => $ability->label(),
             'description' => $ability->description(),
@@ -71,15 +77,18 @@ final class AbilityRegistrar
                     return Errors::internal();
                 }
             },
-            'execute_callback' => static function (mixed $input = null) use ($ability): mixed {
+            'execute_callback' => static function (mixed $input = null) use ($ability, $divi): mixed {
+                $refusal = $divi->refusal($ability);
+                if ($refusal !== null) {
+                    return $refusal;
+                }
+
                 try {
-                    return $ability->execute(is_array($input) ? $input : []);
-                } catch (WriteFailed $e) {
-                    Log::failure($ability->name(), $e);
-                    return $e->toError();
+                    return $divi->annotate($ability, $ability->execute(is_array($input) ? $input : []));
                 } catch (Throwable $e) {
                     Log::failure($ability->name(), $e);
-                    return Errors::internal();
+
+                    return self::errorFor($e);
                 }
             },
             'meta' => [
@@ -95,11 +104,28 @@ final class AbilityRegistrar
             ],
         ];
 
-        $output = $ability->outputSchema();
+        $output = $divi->outputSchema($ability, $ability->outputSchema());
         if ($output !== null) {
             $args['output_schema'] = $output;
         }
 
         return $args;
     }
+
+    /**
+     * A partial write stays partial_write; otherwise a Divi release lock anywhere in the cause chain is its refusal
+     * (spec §5.5); a rolled-back write is write_failed; anything else internal_error.
+     */
+    private static function errorFor(Throwable $e): WP_Error
+    {
+        if ($e instanceof WriteFailed && ! $e->rolledBack) {
+            return $e->toError();
+        }
+        $locked = DiviLocked::in($e);
+        if ($locked !== null) {
+            return $locked->toError();
+        }
+
+        return $e instanceof WriteFailed ? $e->toError() : Errors::internal();
+    }
 }
diff --git a/src/Admin/LogListTable.php b/src/Admin/LogListTable.php
index 54cc36a..707a375 100644
--- a/src/Admin/LogListTable.php
+++ b/src/Admin/LogListTable.php
@@ -126,8 +126,8 @@ final class LogListTable extends \WP_List_Table
     }
 
     /**
-     * Marks rows whose write did not complete (result "partial": failed after an
-     * irreversible step, spec §2 principle 7/8.2) so admins notice them while scrolling.
+     * Marks rows whose write did not complete (result "partial": failed after an irreversible step,
+     * spec §2 principle 7/8.2) or was refused (Divi release lock) so admins notice them while scrolling.
      *
      * @param array<string, mixed> $item
      */
@@ -150,6 +150,7 @@ final class LogListTable extends \WP_List_Table
         return match ($result) {
             'ok' => null,
             'partial' => ['warning', __('teilweise', 'wp-lit-mcp')],
+            'refused' => ['warning', __('abgelehnt', 'wp-lit-mcp')],
             'failed', 'error' => ['error', __('fehlgeschlagen', 'wp-lit-mcp')],
             default => ['error', __('unbekannt', 'wp-lit-mcp')],
         };
diff --git a/src/Admin/LogTab.php b/src/Admin/LogTab.php
index 6bae64a..82860fa 100644
--- a/src/Admin/LogTab.php
+++ b/src/Admin/LogTab.php
@@ -22,7 +22,7 @@ final class LogTab implements AdminTab
     /** Screen option "Einträge pro Seite" (user option; WordPress needs the "_per_page" end). */
     public const PER_PAGE_OPTION = 'lit_mcp_log_per_page';
     public const PER_PAGE_DEFAULT = 20;
-    private const RESULTS = ['ok', 'partial'];
+    private const RESULTS = ['ok', 'partial', 'refused'];
 
     private AdminPostAction $action;
 
@@ -233,7 +233,11 @@ final class LogTab implements AdminTab
         self::filterLabel('result', __('Nach Ergebnis filtern', 'wp-lit-mcp'));
         echo '<select name="result" id="lit-mcp-filter-result">';
         printf('<option value="">%s</option>', esc_html__('Alle Ergebnisse', 'wp-lit-mcp'));
-        $labels = ['ok' => __('erfolgreich', 'wp-lit-mcp'), 'partial' => __('teilweise', 'wp-lit-mcp')];
+        $labels = [
+            'ok' => __('erfolgreich', 'wp-lit-mcp'),
+            'partial' => __('teilweise', 'wp-lit-mcp'),
+            'refused' => __('abgelehnt', 'wp-lit-mcp'),
+        ];
         foreach (self::RESULTS as $result) {
             printf(
                 '<option value="%s"%s>%s</option>',
diff --git a/src/Integrations/Divi/Release/DiviToolGate.php b/src/Integrations/Divi/Release/DiviToolGate.php
new file mode 100644
index 0000000..16ea595
--- /dev/null
+++ b/src/Integrations/Divi/Release/DiviToolGate.php
@@ -0,0 +1,107 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Release;
+
+use Closure;
+use LIT\MCP\Abilities\Ability;
+use LIT\MCP\ChangeLog\ChangeLog;
+use LIT\MCP\Integrations\Divi\Library\LibraryAccess;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderAccess;
+use WP_Error;
+
+defined('ABSPATH') || exit;
+
+/**
+ * The central release lock of the Divi tools (spec §5.5): a writing tool of the groups Divi, Divi-Bibliothek or Divi
+ * Theme Builder is refused before it runs while Divi is not released (logged with result "refused"); a reading tool
+ * runs and gets the notice in warnings. Other tools that reach Divi (lit/content-create with divi) meet the adapter
+ * lock (ReleaseGate::assertWritable()).
+ */
+final class DiviToolGate
+{
+    public const GROUPS = ['divi', LibraryAccess::GROUP, ThemeBuilderAccess::GROUP];
+
+    /** @var Closure(): array<string, string> */
+    private Closure $groups;
+
+    /**
+     * @param Closure(): array<string, string> $groups Ability name => integration ID (IntegrationRegistry::groupMap).
+     */
+    public function __construct(Closure $groups, private ?ChangeLog $log = null)
+    {
+        $this->groups = $groups;
+    }
+
+    public function covers(Ability $ability): bool
+    {
+        return in_array(($this->groups)()[$ability->name()] ?? '', self::GROUPS, true);
+    }
+
+    public function refusal(Ability $ability): ?WP_Error
+    {
+        if (! $this->covers($ability) || self::readsOnly($ability)) {
+            return null;
+        }
+
+        $status = ReleaseGate::status();
+        if ($status->writable()) {
+            return null;
+        }
+
+        $this->log?->record(
+            $ability->name(),
+            'divi',
+            $status->version,
+            sprintf(
+                'Abgelehnt: %s ist %s.',
+                $status->versionLabel(),
+                $status->state === ReleaseState::Incompatible ? 'inkompatibel' : 'nicht freigegeben'
+            ),
+            result: 'refused'
+        );
+
+        return $status->refusal();
+    }
+
+    public function annotate(Ability $ability, mixed $result): mixed
+    {
+        if (! is_array($result) || array_is_list($result) || ! $this->covers($ability) || ! self::readsOnly($ability)) {
+            return $result;
+        }
+
+        $status = ReleaseGate::status();
+        if ($status->writable()) {
+            return $result;
+        }
+
+        $warnings = is_array($result['warnings'] ?? null) ? array_values($result['warnings']) : [];
+        $warnings[] = $status->notice();
+        $result['warnings'] = $warnings;
+
+        return $result;
+    }
+
+    /**
+     * @param array<string, mixed>|null $schema
+     * @return array<string, mixed>|null
+     */
+    public function outputSchema(Ability $ability, ?array $schema): ?array
+    {
+        if ($schema === null || ($schema['type'] ?? null) !== 'object' || ! $this->covers($ability)) {
+            return $schema;
+        }
+
+        $properties = is_array($schema['properties'] ?? null) ? $schema['properties'] : [];
+        $properties['warnings'] ??= ['type' => 'array', 'items' => ['type' => 'string']];
+        $schema['properties'] = $properties;
+
+        return $schema;
+    }
+
+    private static function readsOnly(Ability $ability): bool
+    {
+        return ($ability->annotations()['readonly'] ?? false) === true;
+    }
+}
diff --git a/src/Plugin.php b/src/Plugin.php
index 4c08b39..557ac64 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -24,6 +24,7 @@ use LIT\MCP\Guides\InstructionsBuilder;
 use LIT\MCP\Integrations\Core\CoreIntegration;
 use LIT\MCP\Integrations\Divi\DiviIntegration;
 use LIT\MCP\Integrations\Divi\Library\LibraryAccess;
+use LIT\MCP\Integrations\Divi\Release\DiviToolGate;
 use LIT\MCP\Integrations\Divi\ThemeBuilder\ThemeBuilderAccess;
 use LIT\MCP\Integrations\IntegrationRegistry;
 use LIT\MCP\Integrations\Media\MediaIntegration;
@@ -128,7 +129,7 @@ final class Plugin
         );
 
         $policy = ExposurePolicy::fromOption()->withGroups($registry->groupMap(...));
-        (new AbilityRegistrar($registry, $policy))->register();
+        (new AbilityRegistrar($registry, $policy, new DiviToolGate($registry->groupMap(...), $changeLog)))->register();
         (new ServerRegistrar(
             $registry,
             new InstructionsBuilder($registry, static fn (): array => $schema->postTypeNames(), $policy),
diff --git a/tests/Unit/Abilities/AbilityRegistrarTest.php b/tests/Unit/Abilities/AbilityRegistrarTest.php
index 331f30c..1bc6191 100644
--- a/tests/Unit/Abilities/AbilityRegistrarTest.php
+++ b/tests/Unit/Abilities/AbilityRegistrarTest.php
@@ -9,6 +9,11 @@ use LIT\MCP\Abilities\Ability;
 use LIT\MCP\Abilities\AbilityRegistrar;
 use LIT\MCP\Abilities\ExposurePolicy;
 use LIT\MCP\Abilities\WriteFailed;
+use LIT\MCP\Integrations\Divi\Release\DiviLocked;
+use LIT\MCP\Integrations\Divi\Release\DiviToolGate;
+use LIT\MCP\Integrations\Divi\Release\ReleaseGate;
+use LIT\MCP\Integrations\Divi\Release\ReleaseState;
+use LIT\MCP\Integrations\Divi\Release\ReleaseStatus;
 use LIT\MCP\Integrations\Integration;
 use LIT\MCP\Integrations\IntegrationRegistry;
 use LIT\MCP\Server\RequestContext;
@@ -43,7 +48,18 @@ final class AbilityRegistrarTest extends TestCase
         return new AbilityRegistrar(new IntegrationRegistry($integration));
     }
 
-    private function ability(): Mockery\MockInterface
+    private function diviRegistrar(Ability $ability): AbilityRegistrar
+    {
+        $integration = Mockery::mock(Integration::class);
+        $integration->allows('id')->andReturn('divi');
+        $integration->allows('isAvailable')->andReturn(true);
+        $integration->allows('abilities')->andReturn([$ability]);
+        $registry = new IntegrationRegistry($integration);
+
+        return new AbilityRegistrar($registry, null, new DiviToolGate($registry->groupMap(...)));
+    }
+
+    private function ability(bool $readonly = true): Mockery\MockInterface
     {
         $ability = Mockery::mock(Ability::class);
         $ability->allows('name')->andReturn('lit/test');
@@ -51,7 +67,7 @@ final class AbilityRegistrarTest extends TestCase
         $ability->allows('description')->andReturn('Test ability');
         $ability->allows('inputSchema')->andReturn(['type' => 'object', 'properties' => []]);
         $ability->allows('outputSchema')->andReturn(['type' => 'object']);
-        $ability->allows('annotations')->andReturn(['readonly' => true]);
+        $ability->allows('annotations')->andReturn(['readonly' => $readonly]);
         $ability->allows('isDirect')->andReturn(true);
 
         return $ability;
@@ -202,6 +218,60 @@ final class AbilityRegistrarTest extends TestCase
         unlink($log);
     }
 
+    public function testUntestedDiviRefusesAWritingDiviToolBeforeItRuns(): void
+    {
+        ReleaseGate::useResolver(static fn (): ReleaseStatus => new ReleaseStatus(ReleaseState::Untested, '5.3.0'));
+        $ability = $this->ability(false);
+        $ability->expects('execute')->never();
+
+        $args = $this->diviRegistrar($ability)->argsFor($ability);
+
+        self::assertToolError(($args['execute_callback'])([]), 'divi_untested');
+    }
+
+    public function testALockThrownInsideAWriteBecomesTheLockError(): void
+    {
+        $locked = new DiviLocked(new ReleaseStatus(ReleaseState::Incompatible, '5.3.0', null, ['x']));
+        $ability = $this->ability();
+        $ability->allows('execute')->andThrow(WriteFailed::rolledBack('Nicht gespeichert.', $locked));
+
+        self::assertToolError($this->executeLogged($ability), 'divi_incompatible');
+    }
+
+    public function testAPartialWriteStaysPartialEvenWithALockInside(): void
+    {
+        $locked = new DiviLocked(new ReleaseStatus(ReleaseState::Untested, '5.3.0'));
+        $ability = $this->ability();
+        $ability->allows('execute')->andThrow(WriteFailed::partial('Teilweise gespeichert.', $locked));
+
+        self::assertToolError($this->executeLogged($ability), 'partial_write');
+    }
+
+    /**
+     * Runs the execute callback with error_log() redirected (a PHP internal, not stubbable – like the tests above).
+     */
+    private function executeLogged(Ability $ability): mixed
+    {
+        $log = (string) tempnam(sys_get_temp_dir(), 'lit-mcp-log');
+        $previous = ini_set('error_log', $log);
+
+        try {
+            return ($this->registrarFor($ability)->argsFor($ability)['execute_callback'])([]);
+        } finally {
+            ini_set('error_log', (string) $previous);
+            unlink($log);
+        }
+    }
+
+    public function testDiviReadToolsGetWarningsInTheirSchema(): void
+    {
+        $ability = $this->ability();
+
+        $args = $this->diviRegistrar($ability)->argsFor($ability);
+
+        self::assertArrayHasKey('warnings', $args['output_schema']['properties']);
+    }
+
     public function testRegisterAbilitiesCallsWordPressForEachAbility(): void
     {
         $ability = $this->ability();
diff --git a/tests/Unit/Admin/LogListTableTest.php b/tests/Unit/Admin/LogListTableTest.php
index ee931f1..ad9775a 100644
--- a/tests/Unit/Admin/LogListTableTest.php
+++ b/tests/Unit/Admin/LogListTableTest.php
@@ -141,6 +141,7 @@ final class LogListTableTest extends TestCase
     {
         return [
             ['partial', 'warning', 'teilweise'],
+            ['refused', 'warning', 'abgelehnt'],
             ['failed', 'error', 'fehlgeschlagen'],
             ['<b>kaputt', 'error', 'unbekannt'],
         ];
diff --git a/tests/Unit/Integrations/Divi/Release/DiviToolGateTest.php b/tests/Unit/Integrations/Divi/Release/DiviToolGateTest.php
new file mode 100644
index 0000000..5274a79
--- /dev/null
+++ b/tests/Unit/Integrations/Divi/Release/DiviToolGateTest.php
@@ -0,0 +1,106 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\Release;
+
+use LIT\MCP\Abilities\Ability;
+use LIT\MCP\Integrations\Divi\Release\DiviToolGate;
+use LIT\MCP\Integrations\Divi\Release\ReleaseGate;
+use LIT\MCP\Integrations\Divi\Release\ReleaseState;
+use LIT\MCP\Integrations\Divi\Release\ReleaseStatus;
+use LIT\MCP\Tests\Support\FakeChangeLog;
+use LIT\MCP\Tests\Unit\TestCase;
+use Mockery;
+use WP_Error;
+
+final class DiviToolGateTest extends TestCase
+{
+    private const GROUPS = [
+        'lit/divi-insert' => 'divi',
+        'lit/divi-outline' => 'divi',
+        'lit/library-save' => 'divi-library',
+        'lit/tb-create-template' => 'divi-theme-builder',
+        'lit/content-create' => 'wordpress',
+    ];
+
+    private function ability(string $name, bool $readonly): Ability
+    {
+        $ability = Mockery::mock(Ability::class);
+        $ability->allows('name')->andReturn($name);
+        $ability->allows('annotations')->andReturn(['readonly' => $readonly]);
+
+        return $ability;
+    }
+
+    private function gate(?FakeChangeLog $log = null): DiviToolGate
+    {
+        return new DiviToolGate(static fn (): array => self::GROUPS, $log);
+    }
+
+    private function untested(): void
+    {
+        ReleaseGate::useResolver(static fn (): ReleaseStatus => new ReleaseStatus(ReleaseState::Untested, '5.3.0'));
+    }
+
+    public function testReleasedDiviRefusesNothingAndAddsNothing(): void
+    {
+        $gate = $this->gate(FakeChangeLog::forbidden());
+
+        self::assertNull($gate->refusal($this->ability('lit/divi-insert', false)));
+        self::assertSame(['ok' => true], $gate->annotate($this->ability('lit/divi-outline', true), ['ok' => true]));
+    }
+
+    public function testWriteToolOfEveryDiviGroupIsRefused(): void
+    {
+        $this->untested();
+        $log = new FakeChangeLog();
+        $gate = $this->gate($log);
+
+        foreach (['lit/divi-insert', 'lit/library-save', 'lit/tb-create-template'] as $name) {
+            self::assertToolError($gate->refusal($this->ability($name, false)), 'divi_untested', $name);
+        }
+        self::assertNull($gate->refusal($this->ability('lit/content-create', false)), 'not a Divi tool (adapter lock)');
+        self::assertNull($gate->refusal($this->ability('lit/divi-outline', true)), 'reading stays allowed');
+        self::assertSame(['refused', 'refused', 'refused'], array_column($log->records, 'result'));
+        self::assertSame('Abgelehnt: Divi 5.3.0 ist nicht freigegeben.', $log->records[0]['summary']);
+    }
+
+    public function testReadResultsKeepTheirShapeAndGetTheNotice(): void
+    {
+        $this->untested();
+        $gate = $this->gate();
+        $read = $this->ability('lit/divi-outline', true);
+        $notice = 'Achtung: Divi 5.3.0 ist für LIT MCP ungetestet; Lesen funktioniert, Schreiben ist gesperrt.';
+
+        self::assertSame(['post_id' => 7, 'warnings' => [$notice]], $gate->annotate($read, ['post_id' => 7]));
+        self::assertSame(
+            ['warnings' => ['alt', $notice]],
+            $gate->annotate($read, ['warnings' => ['alt']])
+        );
+        self::assertSame([1, 2], $gate->annotate($read, [1, 2]), 'a list stays a list');
+        $error = new WP_Error('lit_not_found', 'x');
+        self::assertSame($error, $gate->annotate($read, $error));
+        $other = $this->ability('lit/content-create', true);
+        self::assertSame(['post_id' => 7], $gate->annotate($other, ['post_id' => 7]));
+    }
+
+    public function testOutputSchemaAllowsWarnings(): void
+    {
+        $gate = $this->gate();
+        $read = $this->ability('lit/divi-outline', true);
+
+        $properties = ['post_id' => ['type' => 'integer']];
+        $schema = $gate->outputSchema($read, ['type' => 'object', 'properties' => $properties]);
+        $warnings = ['type' => 'array', 'items' => ['type' => 'string']];
+        self::assertSame($warnings, $schema['properties']['warnings'] ?? null);
+
+        $own = ['type' => 'object', 'properties' => ['warnings' => ['type' => 'array']]];
+        self::assertSame($own, $gate->outputSchema($read, $own), 'an existing warnings property stays');
+        self::assertNull($gate->outputSchema($read, null));
+        self::assertSame(
+            ['type' => 'object'],
+            $gate->outputSchema($this->ability('lit/content-create', true), ['type' => 'object'])
+        );
+    }
+}