diff --git a/src/Service/SlackService.php b/src/Service/SlackService.php
index e9b8fbd..8603904 100644
--- a/src/Service/SlackService.php
+++ b/src/Service/SlackService.php
@@ -63,7 +63,7 @@ public function sendRepositoryDiscoveryMessage(DocumentationJar $jar): ResponseI
                         . ":hammer_and_wrench: *Maintainers:* <{$deploymentsUrl}|Review pending deployments> | <{$gitUrl}|:git:>\n"
                         . ":information_source: *Extension authors:* <{$webhookDocsUrl}|How does this work?>",
                     'fallback' => "Repository {$repoKey} is awaiting documentation approval at {$deploymentsUrl}",
-                    'footer' => sprintf("TYPO3 Intercept \u{00b7} <{%s}|(?)>", self::SOURCE_URL),
+                    'footer' => sprintf("TYPO3 Intercept \u{00b7} <%s|(?)>", self::SOURCE_URL),
                     'footer_icon' => self::AVATAR_URL,
                     'mrkdwn_in' => ['text'],
                 ],
diff --git a/tests/Functional/Service/SlackServiceTest.php b/tests/Functional/Service/SlackServiceTest.php
index 20913c2..d7bc739 100644
--- a/tests/Functional/Service/SlackServiceTest.php
+++ b/tests/Functional/Service/SlackServiceTest.php
@@ -89,6 +89,15 @@ public function testSendRepositoryDiscoveryMessageContainsExpectedPayload(): voi
         self::assertStringContainsString('github.com/TYPO3GmbH/site-intercept', $attachment['footer']);
         self::assertStringContainsString('SlackService.php', $attachment['footer']);
 
+        // Every link target must be a bare URL, `<{https://…}|label>` is rendered verbatim by Slack
+        foreach (['text', 'footer'] as $field) {
+            preg_match_all('/<([^|>]*)\|[^>]*>/', $attachment[$field], $links);
+            self::assertNotEmpty($links[1], sprintf('No Slack link found in attachment field "%s"', $field));
+            foreach ($links[1] as $target) {
+                self::assertMatchesRegularExpression('#^https?://\S+$#', $target);
+            }
+        }
+
         // Must opt into mrkdwn rendering for the text field
         self::assertContains('text', $attachment['mrkdwn_in']);