diff --git a/src/Integrations/Divi/Compose/Composer.php b/src/Integrations/Divi/Compose/Composer.php
index b222250..020952a 100644
--- a/src/Integrations/Divi/Compose/Composer.php
+++ b/src/Integrations/Divi/Compose/Composer.php
@@ -7,7 +7,7 @@ namespace LIT\MCP\Integrations\Divi\Compose;
 use InvalidArgumentException;
 use LIT\MCP\Integrations\Divi\BlockTree\AttrMap;
 use LIT\MCP\Integrations\Divi\BlockTree\Block;
-use LIT\MCP\Integrations\Divi\Design\DesignSystem;
+use LIT\MCP\Integrations\Divi\Design\PresetAssignment;
 use LIT\MCP\Integrations\Divi\Schema\ModuleCatalog;
 use LIT\MCP\Integrations\Divi\Schema\ShortformMap;
 
@@ -16,7 +16,8 @@ defined('ABSPATH') || exit;
 /**
  * Builds new Divi blocks from node descriptions (spec §5.4): short form, full form ("attrs")
  * or both; sections with rows ("columns": "1_3,2_3") and modules; parent modules with
- * "items"; presets by name; automatic admin labels "<Abschnitt> – <Modul>" (spec §5.5).
+ * "items"; preset stacks and group presets by name, clear_overrides; automatic admin labels
+ * "<Abschnitt> – <Modul>" (spec §5.5).
  * Every error is collected with its input path; blocks are only usable when there are none.
  * Pure PHP.
  *
@@ -28,16 +29,19 @@ defined('ABSPATH') || exit;
  * names (catalog + StructureRules + Block::create), "fullwidth" and column flexTypes built
  * from digits (ColumnWidths). Design-system names that match several entries are errors
  * listing the ids (ruling S13a: colors/variables in Placeholders, presets in
- * DesignSystem::modulePresetId()).
+ * PresetAssignment).
  */
 final class Composer
 {
-    private const COMMON = ['type', 'label', 'preset', 'attrs'];
+    private const COMMON = ['type', 'label', 'preset', 'group_presets', 'clear_overrides', 'attrs'];
     private const SECTION = ['section_type', 'background_color', 'rows', 'modules'];
     private const ROW = ['columns', 'modules'];
 
     /** Keys of one lit-divi-update change ("id" names the node, read by the ability). */
-    private const UPDATE = ['id', 'set', 'attrs', 'preset', 'label'];
+    private const UPDATE = ['id', 'set', 'attrs', 'preset', 'group_presets', 'clear_overrides', 'label'];
+
+    /** The keys of a node that PresetAssignment::apply() reads (rulings R2, R3). */
+    private const PRESET_KEYS = ['preset', 'group_presets'];
 
     /** ET_BUILDER_PRODUCT_VERSION, e.g. "5.2.1" – written into every new block. */
     private const VERSION = '/^[0-9][0-9A-Za-z.+-]*$/D';
@@ -64,7 +68,7 @@ final class Composer
         private ShortformWriter $shortform,
         private AttrWriter $attrWriter,
         private ValueCleaner $cleaner,
-        private DesignSystem $design,
+        private PresetAssignment $presets,
         private string $builderVersion
     ) {
         if (preg_match(self::VERSION, $builderVersion) !== 1) {
@@ -97,9 +101,11 @@ final class Composer
     /**
      * Applies short-form fields ("set"), full-form attrs, preset and label to an existing block
      * (lit-divi-update); errors like compose(). The block itself is not changed – the caller
-     * sets the returned attrs. "preset": null and "label": null remove them.
+     * sets the returned attrs. "preset": null and "label": null remove them; "preset" may be a stack (list),
+     * "group_presets" assigns group presets (null removes one), "clear_overrides": true removes the local values
+     * the assigned presets also set – after set and attrs (ruling R7).
      *
-     * @param array<array-key, mixed> $change id, set, attrs, preset, label
+     * @param array<array-key, mixed> $change id, set, attrs, preset, group_presets, clear_overrides, label
      * @return array{attrs: array<string, mixed>, errors: array<string, string>, invalid_paths: list<string>}
      */
     public function update(Block $block, array $change, string $field): array
@@ -449,7 +455,8 @@ final class Composer
 
         $attrs = $this->common($name, $attrs, $spec, $path, $this->autoLabel($name, $context));
         if ($defaultLevel) {
-            $attrs = $this->defaultLevel($short, $attrs);
+            // The automatic level is no client value: a preset's headingLevel wins when overrides are cleared.
+            $attrs = $this->clearedOverrides($this->defaultLevel($short, $attrs), $spec, $path);
         }
 
         $block = Block::create($name, $attrs);
@@ -496,24 +503,30 @@ final class Composer
      */
     private function presetAndAttrs(string $name, array $attrs, array $spec, string $path): array
     {
-        if (array_key_exists('preset', $spec)) {
-            $attrs = $this->preset($name, $attrs, $spec['preset'], $path . '.preset');
+        $attrs = $this->presets($name, $attrs, $spec, $path);
+        if (array_key_exists('attrs', $spec)) {
+            $attrs = $this->fullForm($name, $attrs, $spec['attrs'], $path . '.attrs');
         }
 
-        if (! array_key_exists('attrs', $spec)) {
-            return $attrs;
-        }
+        return $this->clearedOverrides($attrs, $spec, $path);
+    }
 
-        if (! is_array($spec['attrs']) || array_is_list($spec['attrs'])) {
-            $this->errors[$path . '.attrs'] = 'Objekt "Attributpfad": {Breakpoint: Wert} erwartet';
+    /**
+     * @param array<string, mixed> $attrs
+     * @return array<string, mixed>
+     */
+    private function fullForm(string $name, array $attrs, mixed $full, string $path): array
+    {
+        if (! is_array($full) || array_is_list($full)) {
+            $this->errors[$path] = 'Objekt "Attributpfad": {Breakpoint: Wert} erwartet';
 
             return $attrs;
         }
 
-        $result = $this->attrWriter->apply($name, $attrs, $spec['attrs'], $path . '.attrs');
+        $result = $this->attrWriter->apply($name, $attrs, $full, $path);
         // An unknown path is the more useful message on its key (it decides invalid_attr_path).
         foreach ($result['invalid_paths'] as $invalid) {
-            $key = $path . '.attrs.' . $invalid;
+            $key = $path . '.' . $invalid;
             if (isset($result['errors'][$key])) {
                 $this->errors[$key] = $result['errors'][$key];
             }
@@ -557,53 +570,56 @@ final class Composer
     }
 
     /**
-     * @param array<string, mixed> $attrs
+     * "preset" (name or id, a stack of them, null/"" = remove) and "group_presets" – through PresetAssignment, the
+     * one place presets reach a block (D7, rulings R2, R3). Its error keys already carry $path. PresetAssignment
+     * keeps the valid group keys when another one fails, so with errors the attrs stay as they were.
+     *
+     * @param array<string, mixed>    $attrs
+     * @param array<array-key, mixed> $spec
      * @return array<string, mixed>
      */
-    private function preset(string $name, array $attrs, mixed $preset, string $path): array
+    private function presets(string $name, array $attrs, array $spec, string $path): array
     {
-        if ($preset === null || $preset === '') {
-            unset($attrs['modulePreset']);
+        $given = array_intersect_key($spec, array_flip(self::PRESET_KEYS));
+        if ($given === []) {
+            return $attrs;
+        }
+
+        if (($given['preset'] ?? null) === '') {
+            $given['preset'] = null;
+        }
+
+        $result = $this->presets->apply($name, $attrs, $given, $path);
+        if ($result['errors'] !== []) {
+            $this->errors += $result['errors'];
 
             return $attrs;
         }
 
-        try {
-            $id = is_string($preset) ? $this->design->modulePresetId($name, $preset) : null;
-        } catch (InvalidArgumentException $e) {
-            // Ruling S13a: a name several presets share (DesignSystem lists their ids).
-            $this->errors[$path] = $e->getMessage();
+        return $result['attrs'];
+    }
+
+    /**
+     * Ruling R7: "clear_overrides": true removes the local values that sit on a leaf an explicitly assigned preset
+     * also sets; it runs after set and attrs, so it also takes what this very call wrote. Not a boolean is an error.
+     *
+     * @param array<string, mixed>    $attrs
+     * @param array<array-key, mixed> $spec
+     * @return array<string, mixed>
+     */
+    private function clearedOverrides(array $attrs, array $spec, string $path): array
+    {
+        if (! array_key_exists('clear_overrides', $spec)) {
+            return $attrs;
+        }
+
+        if (! is_bool($spec['clear_overrides'])) {
+            $this->errors[$path . '.clear_overrides'] = 'true oder false erwartet';
 
             return $attrs;
         }
 
-        if ($id === null) {
-            $names = $this->design->modulePresetNames($name);
-            $this->errors[$path] = sprintf(
-                'unbekanntes Preset; vorhanden für %s: %s',
-                $name,
-                $names === [] ? '(keine)' : implode(', ', $names)
-            );
-
-            return $attrs;
-        }
-
-        // Design-system data, but still through the choke point: an id text() would change is refused.
-        try {
-            $clean = $this->cleaner->clean($name, 'modulePreset', $id, null, ValueKind::Text);
-        } catch (InvalidArgumentException $e) {
-            $clean = null;
-        }
-
-        if ($clean !== $id) {
-            $this->errors[$path] = sprintf('Preset-ID "%s" ist ungültig', $id);
-
-            return $attrs;
-        }
-
-        $attrs['modulePreset'] = [$id];
-
-        return $attrs;
+        return $spec['clear_overrides'] ? $this->presets->clearOverrides($attrs) : $attrs;
     }
 
     /**
diff --git a/src/Integrations/Divi/Compose/ValueCleaner.php b/src/Integrations/Divi/Compose/ValueCleaner.php
index 531d3f1..f4f6829 100644
--- a/src/Integrations/Divi/Compose/ValueCleaner.php
+++ b/src/Integrations/Divi/Compose/ValueCleaner.php
@@ -63,6 +63,9 @@ final class ValueCleaner
     private const BUILDER_ONLY = '/(^|\.)(decoration\.attributes|decoration\.interactions|advanced\.html'
         . '|advanced\.customCss|css|lottie\.innerContent)(\.|$)/';
 
+    /** Module the catalog routes design-system ids through; the kind is fixed to text, so any module will do. */
+    private const ID_MODULE = 'divi/text';
+
     public function __construct(
         private ModuleCatalog $catalog,
         private VariableRef $references,
@@ -92,6 +95,24 @@ final class ValueCleaner
         return $this->cleanNode($module, $path, $value, $subKey, $subKey, $kind);
     }
 
+    /**
+     * Whether $id passes clean() unchanged as plain text – the check for ids that come from the design system
+     * (preset ids, ruling S13): an id the sanitizers would change or refuse is never stored, and an id is never
+     * a Divi reference.
+     */
+    public function keepsId(string $id): bool
+    {
+        if (VariableRef::contains($id)) {
+            return false;
+        }
+
+        try {
+            return $this->clean(self::ID_MODULE, 'modulePreset', $id, null, ValueKind::Text) === $id;
+        } catch (InvalidArgumentException) {
+            return false;
+        }
+    }
+
     /**
      * The kind clean() routes a string of $path (sub-field $subKey) to. lit/divi-replace-text
      * uses it to leave URL and code fields alone (D10).
diff --git a/src/Integrations/Divi/DiviIntegration.php b/src/Integrations/Divi/DiviIntegration.php
index 6947644..99b4a66 100644
--- a/src/Integrations/Divi/DiviIntegration.php
+++ b/src/Integrations/Divi/DiviIntegration.php
@@ -137,7 +137,7 @@ final class DiviIntegration implements Integration
     {
         return new DiviContentComposer(
             $this->schema,
-            new DiviComposition($this->modules, $this->design),
+            $this->composition(),
             new DiviSaver(),
             $this->design,
             $writable
@@ -225,13 +225,22 @@ final class DiviIntegration implements Integration
     {
         return new ThemeBuilderIntegration(
             $this->themeBuilderAccess,
-            new DiviComposition($this->modules, $this->design),
+            $this->composition(),
             new DiviSaver(),
             $this->log,
             new DynamicFields($this->schema)
         );
     }
 
+    /**
+     * The one wiring of the composition for every tool that composes (spec D7): presets and Divi's option groups come
+     * from the design system writer, so a stack or group preset in any write tool resolves against the live book.
+     */
+    private function composition(): DiviComposition
+    {
+        return new DiviComposition($this->modules, $this->design, presetSource: $this->designWriter);
+    }
+
     private function writer(DiviPageLoader $loader): DiviWriter
     {
         return new DiviWriter(
@@ -239,7 +248,7 @@ final class DiviIntegration implements Integration
             new DiviSaver(),
             $this->log,
             $this->design,
-            new DiviComposition($this->modules, $this->design),
+            $this->composition(),
             new GlobalEdits($this->access, $this->globalUsages()),
             new ThemeBuilderEdits($this->themeBuilderAccess, fields: new DynamicFields($this->schema)),
             new SimilarSections($this->access)
@@ -253,7 +262,7 @@ final class DiviIntegration implements Integration
 
     private function presetComposer(): PresetComposer
     {
-        $composition = new DiviComposition($this->modules, $this->design);
+        $composition = $this->composition();
 
         return new PresetComposer(
             $composition->composer(),
diff --git a/src/Integrations/Divi/Pages/DiviComposition.php b/src/Integrations/Divi/Pages/DiviComposition.php
index 1d960f6..93b91dd 100644
--- a/src/Integrations/Divi/Pages/DiviComposition.php
+++ b/src/Integrations/Divi/Pages/DiviComposition.php
@@ -18,6 +18,9 @@ use LIT\MCP\Integrations\Divi\Compose\ValueSanitizer;
 use LIT\MCP\Integrations\Divi\Compose\VariableRef;
 use LIT\MCP\Integrations\Divi\Compose\Warnings;
 use LIT\MCP\Integrations\Divi\Design\DesignSystemReader;
+use LIT\MCP\Integrations\Divi\Design\DesignSystemWriter;
+use LIT\MCP\Integrations\Divi\Design\PresetAssignment;
+use LIT\MCP\Integrations\Divi\Design\PresetBook;
 use LIT\MCP\Integrations\Divi\Schema\DiviModules;
 
 defined('ABSPATH') || exit;
@@ -29,6 +32,11 @@ defined('ABSPATH') || exit;
  * and ONE ValueCleaner instance are shared by AttrWriter, ShortformWriter and Composer, and the
  * same AttrWriter serves Composer and the abilities.
  *
+ * Presets (D7) reach blocks through ONE PresetAssignment per composition: its book is Divi's stored preset
+ * inventory (DesignSystemWriter::presets()), read lazily and at most once – only when a write names a preset or a
+ * warning looks at a block that has one – and Divi's option groups come from DesignSystemWriter::groupsOf().
+ * Without a preset source (null, unit tests) there are no presets.
+ *
  * forPost() binds the composition to the entry being written (DiviWriter::composition() does it
  * for the abilities); unbound, VariableRef's default map applies. Not final so abilities can be
  * tested with a mock.
@@ -42,6 +50,7 @@ class DiviComposition
     private ?ValueCleaner $cleaner = null;
     private ?AttrWriter $attrWriter = null;
     private ?Composer $composer = null;
+    private ?PresetAssignment $assignment = null;
 
     public function __construct(
         private DiviModules $modules,
@@ -49,7 +58,8 @@ class DiviComposition
         private ValueSanitizer $sanitizer = new WpValueSanitizer(),
         private MediaResolver $media = new WpMediaResolver(),
         private DynamicContentMap $dynamicContent = new DynamicContentMap(),
-        private LinkTargets $links = new WpLinkTargets()
+        private LinkTargets $links = new WpLinkTargets(),
+        private ?DesignSystemWriter $presetSource = null
     ) {
     }
 
@@ -64,6 +74,7 @@ class DiviComposition
         $bound->cleaner = null;
         $bound->attrWriter = null;
         $bound->composer = null;
+        $bound->assignment = null;
 
         return $bound;
     }
@@ -102,6 +113,21 @@ class DiviComposition
         return $this->attrWriter ??= new AttrWriter($this->modules->catalog(), $this->placeholders(), $this->cleaner());
     }
 
+    /**
+     * The one PresetAssignment of this composition (D7, rulings R2, R3): the book comes lazily from Divi's stored
+     * presets, ids must pass the choke point unchanged.
+     *
+     * @internal Public for tests; code uses composer() / warnings().
+     */
+    public function presets(): PresetAssignment
+    {
+        return $this->assignment ??= new PresetAssignment(
+            fn (): PresetBook => PresetBook::fromDivi($this->presetSource?->presets() ?? []),
+            fn (string $module): array => $this->presetSource?->groupsOf($module) ?? [],
+            $this->cleaner()->keepsId(...)
+        );
+    }
+
     public function composer(): Composer
     {
         return $this->composer ??= new Composer(
@@ -110,7 +136,7 @@ class DiviComposition
             new ShortformWriter($this->placeholders(), $this->media, $this->cleaner()),
             $this->attrWriter(),
             $this->cleaner(),
-            $this->design->read(),
+            $this->presets(),
             $this->modules->builderVersion()
         );
     }
diff --git a/src/Integrations/Divi/Pages/DiviInsertAbility.php b/src/Integrations/Divi/Pages/DiviInsertAbility.php
index 26b8787..3aa0250 100644
--- a/src/Integrations/Divi/Pages/DiviInsertAbility.php
+++ b/src/Integrations/Divi/Pages/DiviInsertAbility.php
@@ -34,7 +34,9 @@ final class DiviInsertAbility extends DiviWriteAbility
         return 'Fügt Divi-Knoten ein: Module, Zeilen oder ganze Abschnitte in Kurzform (z. B. {"type": "button", '
             . '"text": "Termin buchen", "url": "/kontakt", "preset": "CTA primär"}) und/oder Vollform ("attrs"). '
             . 'Position über parent, before oder after (Pfad-IDs aus lit-divi-outline), sonst ans Seitenende. '
-            . 'Platzhalter wie {{color:primary}} statt fester Werte. tree_rev ist Pflicht; alles oder nichts. '
+            . 'Platzhalter wie {{color:primary}} statt fester Werte. Presets: preset = Name/ID oder Liste (Stapel; '
+            . 'das letzte gewinnt bei gleicher Priorität), group_presets = {Gruppe: Preset}, clear_overrides: true '
+            . 'entfernt lokale Werte, die ein Preset überdecken. tree_rev ist Pflicht; alles oder nichts. '
             . 'Format: lit-guide topic "divi-shortform".';
     }
 
diff --git a/src/Integrations/Divi/Pages/DiviUpdateAbility.php b/src/Integrations/Divi/Pages/DiviUpdateAbility.php
index 5d968b1..059040d 100644
--- a/src/Integrations/Divi/Pages/DiviUpdateAbility.php
+++ b/src/Integrations/Divi/Pages/DiviUpdateAbility.php
@@ -35,9 +35,12 @@ final class DiviUpdateAbility extends DiviWriteAbility
     public function description(): string
     {
         return 'Ändert vorhandene Divi-Knoten: changes = Liste von {id, set: {Kurzform-Felder}, attrs: {Attributpfad: '
-            . '{Breakpoint: Wert}}, preset, label}. null entfernt einen Wert. Nicht genannte Einstellungen bleiben '
-            . 'unverändert. Jeder Knoten nur einmal pro Aufruf; denselben Pfad nicht zugleich über set und attrs. '
-            . 'tree_rev aus lit-divi-outline ist Pflicht; alles oder nichts.';
+            . '{Breakpoint: Wert}}, preset, group_presets, clear_overrides, label}. null entfernt einen Wert. '
+            . 'preset = Name/ID oder Liste (Stapel, bis 10; bei gleicher Priorität gewinnt das letzte Preset im '
+            . 'Stapel); group_presets = {Gruppe: Preset}, z. B. {"font-body": "Fließtext"}. Überdecken lokale Werte '
+            . 'ein Preset, meldet die Antwort das; clear_overrides: true entfernt sie (nach set/attrs). Nicht '
+            . 'genannte Einstellungen bleiben unverändert. Jeder Knoten nur einmal pro Aufruf; denselben Pfad nicht '
+            . 'zugleich über set und attrs. tree_rev aus lit-divi-outline ist Pflicht; alles oder nichts.';
     }
 
     public function inputSchema(): array
@@ -58,7 +61,22 @@ final class DiviUpdateAbility extends DiviWriteAbility
                                 'type' => 'object',
                                 'description' => 'Vollform: Attributpfad → Breakpoint-Werte.',
                             ],
-                            'preset' => ['type' => ['string', 'null'], 'description' => 'Preset-Name; null entfernt.'],
+                            'preset' => self::presetValue(
+                                'Preset-Name oder -ID, Liste (Stapel, 1–10) oder null zum Entfernen. Bei gleicher '
+                                    . 'Priorität gewinnt das letzte Preset im Stapel.'
+                            ),
+                            'group_presets' => [
+                                'type' => 'object',
+                                'description' => 'Gruppen-Presets: {Gruppe: Preset-Name | Liste | null}. Gruppe = '
+                                    . 'Kurzname (font-body), voller Name (divi/font-body) oder Attributpfad; null '
+                                    . 'entfernt den Eintrag der Gruppe.',
+                                'additionalProperties' => self::presetValue(),
+                            ],
+                            'clear_overrides' => [
+                                'type' => 'boolean',
+                                'description' => 'true entfernt lokale Werte, die Werte der zugewiesenen Presets '
+                                    . 'überdecken (nach set und attrs).',
+                            ],
                             'label' => [
                                 'type' => ['string', 'null'],
                                 'description' => 'Admin-Label im Divi-Builder; null entfernt.',
@@ -154,4 +172,21 @@ final class DiviUpdateAbility extends DiviWriteAbility
 
         return $change;
     }
+
+    /**
+     * Schema of one preset value: a name or id, a stack of 1–10 of them, or null.
+     *
+     * @return array<string, mixed>
+     */
+    private static function presetValue(string $description = ''): array
+    {
+        $schema = [
+            'type' => ['string', 'array', 'null'],
+            'items' => ['type' => 'string'],
+            'minItems' => 1,
+            'maxItems' => 10,
+        ];
+
+        return $description === '' ? $schema : $schema + ['description' => $description];
+    }
 }
diff --git a/src/Integrations/WordPress/Content/ContentCreateAbility.php b/src/Integrations/WordPress/Content/ContentCreateAbility.php
index 8693f12..da1477c 100644
--- a/src/Integrations/WordPress/Content/ContentCreateAbility.php
+++ b/src/Integrations/WordPress/Content/ContentCreateAbility.php
@@ -61,7 +61,8 @@ final class ContentCreateAbility implements Ability
         return 'Legt einen neuen Eintrag an – immer als Entwurf (veröffentlichen nur über lit-post-publish). '
             . 'Kerndaten, Begriffe, Felder (gegen das Schema aus lit-content-types geprüft) und Beitragsbild '
             . 'in einem Schritt; bei einem Fehler wird nichts angelegt. Divi-Seiten direkt mit Inhalt: divi = Liste '
-            . 'von Abschnitten in Kurzform (lit-guide topic "divi-shortform"), statt content; das Ergebnis enthält '
+            . 'von Abschnitten in Kurzform (lit-guide topic "divi-shortform"; Module können preset – auch als Liste –, '
+            . 'group_presets und clear_overrides tragen), statt content; das Ergebnis enthält '
             . 'dann tree_rev für die lit-divi-* Werkzeuge.';
     }
 
diff --git a/tests/Support/ComposeFixture.php b/tests/Support/ComposeFixture.php
index d14a261..7e1ae3a 100644
--- a/tests/Support/ComposeFixture.php
+++ b/tests/Support/ComposeFixture.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace LIT\MCP\Tests\Support;
 
+use Closure;
 use LIT\MCP\Integrations\Divi\Compose\AttrWriter;
 use LIT\MCP\Integrations\Divi\Compose\Composer;
 use LIT\MCP\Integrations\Divi\Compose\LinkTargets;
@@ -15,6 +16,8 @@ use LIT\MCP\Integrations\Divi\Compose\ValueCleaner;
 use LIT\MCP\Integrations\Divi\Compose\ValueSanitizer;
 use LIT\MCP\Integrations\Divi\Compose\VariableRef;
 use LIT\MCP\Integrations\Divi\Design\DesignSystem;
+use LIT\MCP\Integrations\Divi\Design\PresetAssignment;
+use LIT\MCP\Integrations\Divi\Design\PresetBook;
 
 /**
  * Compose classes wired with the real Divi 5.2.1 sample catalog, the sample design system and
@@ -193,10 +196,17 @@ final class ComposeFixture
     /**
      * Builder version 5.2.1. $design replaces the sample design system (one Placeholders, one
      * VariableRef and one ValueCleaner shared by AttrWriter, ShortformWriter and Composer, like the
-     * live wiring – ruling S31).
+     * live wiring – ruling S31). The presets come from $book (default: the presets of $design, see
+     * bookOf()); $groupsOf names the option groups per module (default: none).
+     *
+     * @param (Closure(string): array<string, string>)|null $groupsOf
      */
-    public static function composer(bool $unfiltered = false, ?DesignSystem $design = null): Composer
-    {
+    public static function composer(
+        bool $unfiltered = false,
+        ?DesignSystem $design = null,
+        ?PresetBook $book = null,
+        ?Closure $groupsOf = null
+    ): Composer {
         $design ??= DiviFixtures::designSystem();
         $placeholders = new Placeholders($design);
         $cleaner = new ValueCleaner(DiviFixtures::catalog(), new VariableRef($design), self::sanitizer($unfiltered));
@@ -208,8 +218,52 @@ final class ComposeFixture
             new ShortformWriter($placeholders, self::media(), $cleaner),
             $attrWriter,
             $cleaner,
-            $design,
+            self::presetAssignment($book, $groupsOf, $design, $cleaner),
             '5.2.1'
         );
     }
+
+    /**
+     * The presets of $design in Divi's stored format (ids, names, defaults; no attrs) as a PresetBook – so the tests
+     * that hand a DesignSystem to composer() keep their presets.
+     */
+    public static function bookOf(DesignSystem $design): PresetBook
+    {
+        $raw = ['module' => [], 'group' => []];
+        foreach ($design->presets() as $preset) {
+            $raw[$preset['kind']][$preset['module']] ??= ['default' => '', 'items' => []];
+            $raw[$preset['kind']][$preset['module']]['items'][$preset['id']] = [
+                'id' => $preset['id'],
+                'name' => $preset['name'],
+                $preset['kind'] === 'module' ? 'moduleName' : 'groupName' => $preset['module'],
+            ];
+            if ($preset['default']) {
+                $raw[$preset['kind']][$preset['module']]['default'] = $preset['id'];
+            }
+        }
+
+        return PresetBook::fromDivi($raw);
+    }
+
+    /**
+     * PresetAssignment as the live wiring builds it: the book is $book (default: bookOf($design), else of the sample
+     * design system), the id check is the cleaner's keepsId().
+     *
+     * @param (Closure(string): array<string, string>)|null $groupsOf
+     */
+    public static function presetAssignment(
+        ?PresetBook $book = null,
+        ?Closure $groupsOf = null,
+        ?DesignSystem $design = null,
+        ?ValueCleaner $cleaner = null
+    ): PresetAssignment {
+        $book ??= self::bookOf($design ?? DiviFixtures::designSystem());
+        $cleaner ??= self::cleaner();
+
+        return new PresetAssignment(
+            static fn (): PresetBook => $book,
+            $groupsOf ?? static fn (string $module): array => [],
+            $cleaner->keepsId(...)
+        );
+    }
 }
diff --git a/tests/Unit/Integrations/Divi/Compose/ComposerTest.php b/tests/Unit/Integrations/Divi/Compose/ComposerTest.php
index bddf7ab..f01c798 100644
--- a/tests/Unit/Integrations/Divi/Compose/ComposerTest.php
+++ b/tests/Unit/Integrations/Divi/Compose/ComposerTest.php
@@ -5,12 +5,14 @@ declare(strict_types=1);
 namespace LIT\MCP\Tests\Unit\Integrations\Divi\Compose;
 
 use InvalidArgumentException;
+use LIT\MCP\Integrations\Divi\BlockTree\AttrMap;
 use LIT\MCP\Integrations\Divi\BlockTree\Block;
 use LIT\MCP\Integrations\Divi\BlockTree\NodeSummary;
 use LIT\MCP\Integrations\Divi\BlockTree\Parser;
 use LIT\MCP\Integrations\Divi\BlockTree\Serializer;
 use LIT\MCP\Integrations\Divi\Compose\Composer;
 use LIT\MCP\Integrations\Divi\Design\DesignSystem;
+use LIT\MCP\Integrations\Divi\Design\PresetBook;
 use LIT\MCP\Tests\Support\ComposeFixture;
 use LIT\MCP\Tests\Support\DiviFixtures;
 use PHPUnit\Framework\TestCase;
@@ -424,6 +426,165 @@ final class ComposerTest extends TestCase
         self::assertArrayNotHasKey('modulePreset', $result['attrs']);
     }
 
+    /** Button presets p-1/p-2 as in the sample design system; p-2 carries a font color, g-1 is a font group preset. */
+    private static function coveringBook(): PresetBook
+    {
+        return PresetBook::fromDivi([
+            'module' => ['divi/button' => ['default' => 'p-1', 'items' => [
+                'p-1' => ['id' => 'p-1', 'name' => 'Standard', 'moduleName' => 'divi/button'],
+                'p-2' => [
+                    'id' => 'p-2',
+                    'name' => 'CTA primär',
+                    'moduleName' => 'divi/button',
+                    'attrs' => ['button' => ['decoration' => ['font' => ['font' => [
+                        'desktop' => ['value' => ['color' => '#ffffff']],
+                    ]]]]],
+                ],
+            ]]],
+            'group' => ['divi/font' => ['default' => '', 'items' => [
+                'g-1' => ['id' => 'g-1', 'name' => 'Fließtext groß', 'groupName' => 'divi/font'],
+            ]]],
+        ]);
+    }
+
+    /** @return array<string, string> The option groups the tests give every button. */
+    private static function buttonGroups(string $module): array
+    {
+        return $module === 'divi/button' ? ['button.decoration.font.font' => 'divi/font'] : [];
+    }
+
+    public function testPresetStackIsStoredInTheGivenOrder(): void
+    {
+        $composer = ComposeFixture::composer();
+
+        $result = $composer->compose(
+            [['type' => 'button', 'text' => 'Los', 'preset' => ['CTA primär', 'p-1']]],
+            Block::create('divi/column'),
+            'nodes'
+        );
+        self::assertSame([], $result['errors']);
+        self::assertSame(['p-2', 'p-1'], $result['blocks'][0]->attrs()['modulePreset']);
+
+        $update = $composer->update(Block::create('divi/button'), ['preset' => ['Standard', 'CTA primär']], 'changes[0]');
+        self::assertSame([], $update['errors']);
+        self::assertSame(['p-1', 'p-2'], $update['attrs']['modulePreset']);
+    }
+
+    public function testPresetStackErrorsKeepTheirInputPaths(): void
+    {
+        $composer = ComposeFixture::composer();
+        $button = Block::create('divi/button');
+
+        $unknown = $composer->update($button, ['preset' => ['Standard', 'Gibt es nicht']], 'changes[0]');
+        self::assertSame(
+            'unbekanntes Preset; vorhanden für divi/button: Standard, CTA primär',
+            $unknown['errors']['changes[0].preset.1']
+        );
+        self::assertArrayNotHasKey('modulePreset', $unknown['attrs']);
+
+        foreach ([[], ['Standard', 'p-1']] as $invalid) {
+            $result = $composer->update($button, ['preset' => $invalid], 'changes[0]');
+            self::assertNotSame([], preg_grep('/^changes\[0\]\.preset/', array_keys($result['errors'])));
+            self::assertArrayNotHasKey('modulePreset', $result['attrs']);
+        }
+    }
+
+    public function testGroupPresetsAreAssignedByShortNameAndRemovedWithNull(): void
+    {
+        $composer = ComposeFixture::composer(false, null, null, self::buttonGroups(...));
+        $groups = ['button.decoration.font.font' => ['groupName' => 'divi/font', 'presetIds' => ['g-1']]];
+
+        $update = $composer->update(Block::create('divi/button'), ['group_presets' => ['font' => 'Fließtext groß']], 'changes[0]');
+        self::assertSame([], $update['errors']);
+        self::assertSame($groups, NodeSummary::groupPresets(Block::create('divi/button', $update['attrs'])));
+
+        $created = $composer->compose(
+            [['type' => 'button', 'text' => 'Los', 'group_presets' => ['divi/font' => 'g-1']]],
+            Block::create('divi/column'),
+            'nodes'
+        );
+        self::assertSame([], $created['errors']);
+        self::assertSame($groups, NodeSummary::groupPresets($created['blocks'][0]));
+
+        $removed = $composer->update(Block::create('divi/button', $update['attrs']), ['group_presets' => ['font' => null]], 'changes[0]');
+        self::assertSame([], $removed['errors']);
+        self::assertSame([], NodeSummary::groupPresets(Block::create('divi/button', $removed['attrs'])));
+        self::assertArrayNotHasKey('groupPreset', $removed['attrs']);
+
+        $unknown = $composer->update(Block::create('divi/button'), ['group_presets' => ['farbe' => 'x']], 'changes[0]');
+        self::assertArrayHasKey('changes[0].group_presets.farbe', $unknown['errors']);
+    }
+
+    /** Ruling R7: clear_overrides runs after set/attrs of the same node and removes only leaves a preset also sets. */
+    public function testClearOverridesRunsAfterSetAndAttrsOnANewNode(): void
+    {
+        $composer = ComposeFixture::composer(false, null, self::coveringBook());
+        $font = ['desktop' => ['color' => '#abcdef', 'family' => 'Open Sans']];
+
+        $kept = $composer->compose(
+            [['type' => 'button', 'text' => 'Los', 'preset' => 'CTA primär', 'attrs' => ['button.decoration.font.font' => $font]]],
+            Block::create('divi/column'),
+            'nodes'
+        );
+        self::assertSame([], $kept['errors']);
+        self::assertSame(
+            ['color' => '#abcdef', 'family' => 'Open Sans'],
+            AttrMap::desktop($kept['blocks'][0]->attrs(), 'button.decoration.font.font')
+        );
+
+        $cleared = $composer->compose(
+            [[
+                'type' => 'button',
+                'text' => 'Los',
+                'preset' => 'CTA primär',
+                'clear_overrides' => true,
+                'attrs' => ['button.decoration.font.font' => $font],
+            ]],
+            Block::create('divi/column'),
+            'nodes'
+        );
+        self::assertSame([], $cleared['errors']);
+        $attrs = $cleared['blocks'][0]->attrs();
+        self::assertSame(['p-2'], $attrs['modulePreset']);
+        self::assertSame(['family' => 'Open Sans'], AttrMap::desktop($attrs, 'button.decoration.font.font'));
+        self::assertSame('Los', AttrMap::desktop($attrs, 'button.innerContent')['text']);
+    }
+
+    public function testClearOverridesOnAnUpdateKeepsEverythingNoPresetCovers(): void
+    {
+        $composer = ComposeFixture::composer(false, null, self::coveringBook());
+        $attrs = ['modulePreset' => ['p-2'], 'button' => ['decoration' => ['font' => ['font' => [
+            'desktop' => ['value' => ['color' => '#000000']],
+        ]]]]];
+
+        $result = $composer->update(Block::create('divi/button', $attrs), ['clear_overrides' => true], 'changes[0]');
+        self::assertSame([], $result['errors']);
+        self::assertSame(['modulePreset' => ['p-2']], $result['attrs']);
+
+        $plain = Block::create('divi/button', ['button' => ['innerContent' => ['desktop' => ['value' => ['text' => 'Alt']]]]]);
+        $unchanged = $composer->update($plain, ['clear_overrides' => true], 'changes[0]');
+        self::assertSame([], $unchanged['errors']);
+        self::assertSame($plain->attrs(), $unchanged['attrs']);
+
+        $off = $composer->update(Block::create('divi/button', $attrs), ['clear_overrides' => false], 'changes[0]');
+        self::assertSame($attrs, $off['attrs']);
+    }
+
+    public function testClearOverridesMustBeABoolean(): void
+    {
+        $composer = ComposeFixture::composer();
+
+        $update = $composer->update(Block::create('divi/button'), ['clear_overrides' => 'ja'], 'changes[0]');
+        self::assertSame('true oder false erwartet', $update['errors']['changes[0].clear_overrides']);
+
+        $compose = $composer->compose(
+            [['type' => 'section', 'clear_overrides' => null, 'modules' => []]],
+            null,
+            'nodes'
+        );
+        self::assertSame('true oder false erwartet', $compose['errors']['nodes[0].clear_overrides']);
+    }
+
     public function testBuilderVersionMustBeAVersion(): void
     {
         $this->expectException(InvalidArgumentException::class);
@@ -434,7 +595,7 @@ final class ComposerTest extends TestCase
             ComposeFixture::shortform(),
             ComposeFixture::attrWriter(),
             ComposeFixture::cleaner(),
-            DiviFixtures::designSystem(),
+            ComposeFixture::presetAssignment(),
             '5.2.1"},"x":{"'
         );
     }
diff --git a/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php b/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php
index 7543687..0b12b19 100644
--- a/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php
+++ b/tests/Unit/Integrations/Divi/Compose/ValueCleanerTest.php
@@ -253,4 +253,17 @@ final class ValueCleanerTest extends TestCase
         self::assertSame('x', ComposeFixture::cleaner()->clean('divi/lottie', 'lottie.advanced.width', 'x'));
         self::assertSame('x', ComposeFixture::cleaner()->clean('divi/lottie', 'lottie.innerContentish', 'x'));
     }
+
+    /** Design-system ids (preset ids) are no client text, but they pass the choke point unchanged (ruling S13). */
+    public function testKeepsIdAcceptsPlainIdsAndRefusesEverythingTheCleanerChanges(): void
+    {
+        $cleaner = ComposeFixture::cleaner();
+
+        self::assertTrue($cleaner->keepsId('3gbmxlurey'));
+        self::assertTrue($cleaner->keepsId('a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d'));
+        self::assertFalse($cleaner->keepsId('<b>p</b>'), 'tags would be stripped');
+        self::assertFalse($cleaner->keepsId('p%41x'), 'octets would be stripped');
+        self::assertFalse($cleaner->keepsId("p\x01"), 'control characters would be stripped');
+        self::assertFalse($cleaner->keepsId(ComposeFixture::REFERENCE_ALT), 'an id is never a $variable reference');
+    }
 }
diff --git a/tests/Unit/Integrations/Divi/Pages/DiviCompositionTest.php b/tests/Unit/Integrations/Divi/Pages/DiviCompositionTest.php
index d54b5b8..6aebcc0 100644
--- a/tests/Unit/Integrations/Divi/Pages/DiviCompositionTest.php
+++ b/tests/Unit/Integrations/Divi/Pages/DiviCompositionTest.php
@@ -8,10 +8,12 @@ use LIT\MCP\Integrations\Divi\BlockTree\AttrMap;
 use LIT\MCP\Integrations\Divi\BlockTree\Block;
 use LIT\MCP\Integrations\Divi\BlockTree\Document;
 use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
+use LIT\MCP\Integrations\Divi\BlockTree\NodeSummary;
 use LIT\MCP\Integrations\Divi\Compose\StoredNodeGuard;
 use LIT\MCP\Integrations\Divi\Compose\TreeEditor;
 use LIT\MCP\Integrations\Divi\Compose\VariableRef;
 use LIT\MCP\Integrations\Divi\Design\DesignSystemReader;
+use LIT\MCP\Integrations\Divi\Design\DesignSystemWriter;
 use LIT\MCP\Integrations\Divi\Pages\DiviComposition;
 use LIT\MCP\Integrations\Divi\Pages\DynamicContentMap;
 use LIT\MCP\Integrations\Divi\Schema\DiviModules;
@@ -26,7 +28,7 @@ final class DiviCompositionTest extends TestCase
     /** @var list<int> */
     private array $registryCalls = [];
 
-    private function composition(): DiviComposition
+    private function composition(?DesignSystemWriter $presets = null): DiviComposition
     {
         $modules = Mockery::mock(DiviModules::class);
         $modules->allows('catalog')->andReturn(DiviFixtures::catalog());
@@ -45,10 +47,33 @@ final class DiviCompositionTest extends TestCase
             ComposeFixture::sanitizer(),
             ComposeFixture::media(),
             $registry,
-            ComposeFixture::links()
+            ComposeFixture::links(),
+            presetSource: $presets
         );
     }
 
+    /** The preset source of the live wiring: Divi's stored presets (raw format) and the option groups per module. */
+    private function presetSource(int $reads = 1): DesignSystemWriter
+    {
+        $writer = Mockery::mock(DesignSystemWriter::class);
+        $writer->expects('presets')->times($reads)->andReturn([
+            'module' => ['divi/button' => ['default' => 'p-1', 'items' => [
+                'p-1' => ['id' => 'p-1', 'name' => 'Standard', 'moduleName' => 'divi/button'],
+                'p-2' => ['id' => 'p-2', 'name' => 'CTA primär', 'moduleName' => 'divi/button'],
+            ]]],
+            'group' => ['divi/font' => ['default' => '', 'items' => [
+                'g-1' => ['id' => 'g-1', 'name' => 'Fließtext groß', 'groupName' => 'divi/font'],
+            ]]],
+        ]);
+        $writer->allows('groupsOf')->andReturnUsing(
+            static fn (string $module): array => $module === 'divi/button'
+                ? ['button.decoration.font.font' => 'divi/font']
+                : []
+        );
+
+        return $writer;
+    }
+
     private static function siteTitle(): string
     {
         return VariableRef::serialize('content', 'site_title', ['before' => '', 'after' => '']);
@@ -156,4 +181,61 @@ final class DiviCompositionTest extends TestCase
             DiviWriterFixture::composition(DiviWriterFixture::designReader(), true)->storedGuard()->problems($code)
         );
     }
+
+    public function testPresetStackAndGroupsComeFromTheWritersBookAndAreReadOnce(): void
+    {
+        $composer = $this->composition($this->presetSource())->forPost(7)->composer();
+
+        $result = $composer->compose([
+            ['type' => 'button', 'text' => 'Eins', 'preset' => ['CTA primär', 'Standard'], 'group_presets' => ['font' => 'g-1']],
+            ['type' => 'button', 'text' => 'Zwei', 'preset' => 'p-2'],
+        ], Block::create('divi/column'), 'nodes');
+
+        self::assertSame([], $result['errors']);
+        self::assertSame(['p-2', 'p-1'], $result['blocks'][0]->attrs()['modulePreset']);
+        self::assertSame(['p-2'], $result['blocks'][1]->attrs()['modulePreset']);
+        self::assertSame(
+            ['button.decoration.font.font' => ['groupName' => 'divi/font', 'presetIds' => ['g-1']]],
+            NodeSummary::groupPresets($result['blocks'][0])
+        );
+    }
+
+    public function testThePresetBookIsNotReadWithoutAPresetInTheInput(): void
+    {
+        $writer = Mockery::mock(DesignSystemWriter::class);
+        $writer->shouldNotReceive('presets');
+        $writer->shouldNotReceive('groupsOf');
+
+        $result = $this->composition($writer)->forPost(7)->composer()->compose(
+            [['type' => 'button', 'text' => 'Los']],
+            Block::create('divi/column'),
+            'nodes'
+        );
+
+        self::assertSame([], $result['errors']);
+    }
+
+    public function testWithoutAPresetSourceNoPresetExists(): void
+    {
+        $result = $this->composition()->forPost(7)->composer()->compose(
+            [['type' => 'button', 'text' => 'Los', 'preset' => 'Standard']],
+            Block::create('divi/column'),
+            'nodes'
+        );
+
+        self::assertSame(
+            'unbekanntes Preset; vorhanden für divi/button: (keine)',
+            $result['errors']['nodes[0].preset']
+        );
+    }
+
+    public function testOnePresetAssignmentPerBoundComposition(): void
+    {
+        $base = $this->composition($this->presetSource(0));
+        $seven = $base->forPost(7);
+
+        self::assertSame($seven->presets(), $seven->presets());
+        self::assertNotSame($seven->presets(), $base->forPost(8)->presets());
+        self::assertNotSame($base->presets(), $seven->presets());
+    }
 }
diff --git a/tests/Unit/Integrations/Divi/Pages/DiviUpdateAbilityTest.php b/tests/Unit/Integrations/Divi/Pages/DiviUpdateAbilityTest.php
index 9741ad1..119ae6d 100644
--- a/tests/Unit/Integrations/Divi/Pages/DiviUpdateAbilityTest.php
+++ b/tests/Unit/Integrations/Divi/Pages/DiviUpdateAbilityTest.php
@@ -261,5 +261,51 @@ final class DiviUpdateAbilityTest extends DiviWriteAbilityTestCase
         self::assertStringNotContainsString('1058', (string) json_encode($hidden));
         self::assertStringContainsString('[global 1059]', (string) $shown['outline']);
     }
-}
 
+    public function testUpdateOffersPresetStacksGroupPresetsAndClearOverrides(): void
+    {
+        $change = $this->update()->inputSchema()['properties']['changes']['items']['properties'];
+
+        self::assertSame(['string', 'array', 'null'], $change['preset']['type']);
+        self::assertSame(['type' => 'string'], $change['preset']['items']);
+        self::assertSame([1, 10], [$change['preset']['minItems'], $change['preset']['maxItems']]);
+        self::assertSame('object', $change['group_presets']['type']);
+        self::assertSame(['string', 'array', 'null'], $change['group_presets']['additionalProperties']['type']);
+        self::assertSame([1, 10], [
+            $change['group_presets']['additionalProperties']['minItems'],
+            $change['group_presets']['additionalProperties']['maxItems'],
+        ]);
+        self::assertSame('boolean', $change['clear_overrides']['type']);
+
+        $description = $this->update()->description();
+        foreach (['group_presets', 'clear_overrides', 'das letzte Preset'] as $text) {
+            self::assertStringContainsString($text, $description);
+        }
+        self::assertStringContainsString('group_presets', $this->insert()->description());
+    }
+
+    public function testClearOverridesMustBeABoolean(): void
+    {
+        $result = $this->update()->execute(['post_id' => 7, 'tree_rev' => $this->treeRev(), 'changes' => [
+            ['id' => 's0.r0.c1.m2', 'clear_overrides' => 'ja'],
+        ]]);
+
+        self::assertToolError($result, 'validation_failed');
+        self::assertSame(
+            'true oder false erwartet',
+            self::clientError($result)['fields']['changes[0].clear_overrides']
+        );
+        self::assertSame([], $this->saved);
+    }
+
+    /** A pure clear_overrides that finds no covering value changes nothing and saves nothing. */
+    public function testClearOverridesWithoutAHitIsNoChange(): void
+    {
+        $result = $this->update()->execute(['post_id' => 7, 'tree_rev' => $this->treeRev(), 'changes' => [
+            ['id' => 's0.r0.c1.m2', 'clear_overrides' => true],
+        ]]);
+
+        self::assertStringStartsWith('Keine Änderung', $result['summary']);
+        self::assertSame([], $this->saved);
+    }
+}
diff --git a/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php b/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php
index 80bb101..5609016 100644
--- a/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php
+++ b/tests/Unit/Integrations/WordPress/Content/ContentCreateAbilityTest.php
@@ -263,4 +263,13 @@ final class ContentCreateAbilityTest extends TestCase
         Functions\when('current_user_can')->justReturn(false);
         self::assertToolError($ability->permission(['post_type' => 'page']), 'forbidden');
     }
+
+    public function testDescriptionNamesPresetStacksAndGroupPresets(): void
+    {
+        $ability = new ContentCreateAbility($this->schema(), Mockery::mock(PostWriter::class), FakeChangeLog::forbidden());
+        $description = $ability->description();
+
+        self::assertStringContainsString('group_presets', $description);
+        self::assertStringContainsString('clear_overrides', $description);
+    }
 }