diff --git a/docs/modules/market_management/konzepte/market_management_hermes_mcp_api.md b/docs/modules/market_management/konzepte/market_management_hermes_mcp_api.md
index 17b00e8..595a594 100644
--- a/docs/modules/market_management/konzepte/market_management_hermes_mcp_api.md
+++ b/docs/modules/market_management/konzepte/market_management_hermes_mcp_api.md
@@ -138,12 +138,12 @@ Das Ergebnis steht bei `tools/call` als JSON im Textinhalt des ersten
   - liefert Marktdurchführungen inklusive Markttagen, Kosten und berechneten Verkaufswerten
 - `market_management.create_market`
   - erforderlich: `name`, `category_id`, `organizer_id`
+  - optional: `website_url` als HTTP(S)-URL des Marktes; Eingaben ohne Schema werden als `https://` normalisiert
 - `market_management.list_market_organizers`
   - liefert aktive Veranstalterorganisationen
 - `market_management.create_market_organizer`
   - erforderlich: `name`
   - optional: `email`, `phone`
-  - optional: `website_url` als HTTP(S)-URL des Marktes
 - `market_management.update_market`
   - erforderlich: `market_id`
   - änderbar: `name`, `category_id`, `website_url`
diff --git a/modules/market_management/mcp.php b/modules/market_management/mcp.php
index 92f85de..1cac574 100644
--- a/modules/market_management/mcp.php
+++ b/modules/market_management/mcp.php
@@ -75,8 +75,8 @@ function market_management_mcp_tools(): array
         ['name' => 'market_management.search_markets', 'description' => 'Märkte suchen', 'inputSchema' => ['type' => 'object', 'properties' => $searchProperties]],
         ['name' => 'market_management.search_occurrences', 'description' => 'Marktdurchführungen suchen und auflisten', 'inputSchema' => ['type' => 'object', 'properties' => $searchProperties]],
         ['name' => 'market_management.get_market', 'description' => 'Markt mit Marktdurchführungen lesen', 'inputSchema' => ['type' => 'object', 'required' => ['market_id'], 'properties' => ['market_id' => ['type' => 'integer'], 'include_archived' => ['type' => 'boolean']]]],
-        ['name' => 'market_management.create_market', 'description' => 'Markt mit verpflichtendem Veranstalter, Kategorie und optionaler Website-URL anlegen', 'inputSchema' => ['type' => 'object', 'required' => ['name', 'category_id', 'organizer_id'], 'properties' => ['name' => ['type' => 'string'], 'category_id' => ['type' => 'integer'], 'organizer_id' => ['type' => 'integer'], 'website_url' => ['type' => ['string', 'null'], 'format' => 'uri']]]],
-        ['name' => 'market_management.update_market', 'description' => 'Markt inklusive Veranstalter und Website-URL ändern', 'inputSchema' => ['type' => 'object', 'required' => ['market_id'], 'properties' => ['market_id' => ['type' => 'integer'], 'name' => ['type' => 'string'], 'category_id' => ['type' => 'integer'], 'organizer_id' => ['type' => 'integer'], 'website_url' => ['type' => ['string', 'null'], 'format' => 'uri']]]],
+        ['name' => 'market_management.create_market', 'description' => 'Markt mit verpflichtendem Veranstalter, Kategorie und optionaler Website-URL anlegen', 'inputSchema' => ['type' => 'object', 'required' => ['name', 'category_id', 'organizer_id'], 'properties' => ['name' => ['type' => 'string'], 'category_id' => ['type' => 'integer'], 'organizer_id' => ['type' => 'integer'], 'website_url' => ['type' => ['string', 'null']]]]],
+        ['name' => 'market_management.update_market', 'description' => 'Markt inklusive Veranstalter und Website-URL ändern', 'inputSchema' => ['type' => 'object', 'required' => ['market_id'], 'properties' => ['market_id' => ['type' => 'integer'], 'name' => ['type' => 'string'], 'category_id' => ['type' => 'integer'], 'organizer_id' => ['type' => 'integer'], 'website_url' => ['type' => ['string', 'null']]]]],
         ['name' => 'market_management.archive_market', 'description' => 'Markt archivieren', 'inputSchema' => ['type' => 'object', 'required' => ['market_id'], 'properties' => ['market_id' => ['type' => 'integer']]]],
         ['name' => 'market_management.reactivate_market', 'description' => 'Markt reaktivieren', 'inputSchema' => ['type' => 'object', 'required' => ['market_id'], 'properties' => ['market_id' => ['type' => 'integer']]]],
         ['name' => 'market_management.list_categories', 'description' => 'Bestehende Kategorien lesen', 'inputSchema' => ['type' => 'object', 'properties' => (object) []]],
diff --git a/modules/market_management/service.php b/modules/market_management/service.php
index f74dabf..c066179 100644
--- a/modules/market_management/service.php
+++ b/modules/market_management/service.php
@@ -352,6 +352,10 @@ function market_management_optional_url(array $input, string $field): ?string
         return null;
     }
 
+    if (!preg_match('/^https?:\/\//i', $value)) {
+        $value = 'https://' . $value;
+    }
+
     if (filter_var($value, FILTER_VALIDATE_URL) === false || !preg_match('/^https?:\/\//i', $value)) {
         throw new InvalidArgumentException($field . ' muss eine gültige HTTP(S)-URL sein.');
     }
diff --git a/modules/shared/auth/ui/home.php b/modules/shared/auth/ui/home.php
index f3ae039..a123806 100644
--- a/modules/shared/auth/ui/home.php
+++ b/modules/shared/auth/ui/home.php
@@ -1322,6 +1322,7 @@ function render_auth_home_page(array $user, array $otcProducts = [], array $otcM
 JS;
     echo "  prepareMarketDefinitionDeleteCard();";
     echo "  const sharedCard = drawer.querySelector('[data-market-definition-card]');";
+    echo "  const websiteInput = form.querySelector('[data-market-definition-website]'); if (websiteInput) { websiteInput.type = 'text'; }";
     echo "  if (window.SharedEditableActionCard) { window.SharedEditableActionCard.init(definitionContent); }";
     echo "  const setDrawerState = (open) => { const drawerOpen = Boolean(open); if (!drawerOpen && marketDefinitionMobileOpen) { marketDefinitionMobileDetail?.restore(); marketDefinitionMobileHost = null; marketDefinitionMobileOpen = false; } const backdropOpen = drawerOpen && !marketDefinitionMobileOpen; drawer.dataset.open = String(drawerOpen); drawer.setAttribute('aria-hidden', String(!drawerOpen)); if (activeMarket?.trigger) { activeMarket.trigger.setAttribute('aria-expanded', String(drawerOpen)); } const backdrop = definitionContent.querySelector('[data-market-definition-drawer-backdrop]'); if (backdrop) { backdrop.dataset.open = String(backdropOpen); backdrop.setAttribute('aria-hidden', String(!backdropOpen)); } document.body.classList.toggle('sg-card-list-page-drawer-open', backdropOpen); };";
     echo "  const restoreMarketDefinitionMobileDetail = () => { marketDefinitionMobileDetail?.restore(); marketDefinitionMobileHost = null; marketDefinitionMobileOpen = false; };";
diff --git a/scripts/tests/market_management_url_test.php b/scripts/tests/market_management_url_test.php
new file mode 100644
index 0000000..5103cce
--- /dev/null
+++ b/scripts/tests/market_management_url_test.php
@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../modules/market_management/service.php';
+
+function fail_test(string $message): void
+{
+    fwrite(STDERR, $message . PHP_EOL);
+    exit(1);
+}
+
+function assert_test(bool $condition, string $message): void
+{
+    if (!$condition) {
+        fail_test($message);
+    }
+}
+
+$normalized = market_management_optional_url(['website_url' => 'www.stadtaffoltern.ch'], 'website_url');
+assert_test($normalized === 'https://www.stadtaffoltern.ch', 'Website without scheme must be normalized to HTTPS');
+
+$existingScheme = market_management_optional_url(['website_url' => 'http://www.stadtaffoltern.ch'], 'website_url');
+assert_test($existingScheme === 'http://www.stadtaffoltern.ch', 'Existing HTTP scheme must be preserved');
+
+try {
+    market_management_optional_url(['website_url' => 'not a url'], 'website_url');
+    fail_test('Invalid website URL must be rejected');
+} catch (InvalidArgumentException) {
+}
+
+fwrite(STDOUT, "market_management_url_test: OK\n");