diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index ddf4eba..4c7cac8 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -3,19 +3,26 @@
 use PhpCsFixer\Config;
 use PhpCsFixer\Finder;
 
+$baseline_file = __DIR__ . '/../../PluginsPhpCsFixer.php';
+if (!file_exists($baseline_file)) {
+    throw new RuntimeException(
+        sprintf(
+            'Unable to find "%s". Running php-cs-fixer on a plugin requires a GLPI development checkout that ships PluginsPhpCsFixer.php.',
+            $baseline_file,
+        ),
+    );
+}
+
+$baseline = require $baseline_file;
+
 $finder = Finder::create()
     ->in(__DIR__)
-    ->name('*.php')
-    ->ignoreVCSIgnored(true);
-
-$config = new Config();
+    ->ignoreVCSIgnored(true)
+    ->name('*.php');
 
-$rules = [
-    '@PER-CS' => true, // Latest PER rules.
-];
+/** @var Config $config */
+$config = $baseline($finder);
 
 return $config
-    ->setRules($rules)
-    ->setFinder($finder)
     ->setCacheFile(__DIR__ . '/var/php-cs-fixer/.php-cs-fixer.cache')
 ;
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c555f88..ab14cf4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Fix search crash when the "Tags - Entity" column is displayed
 - Fix tag associate item
+- Fix lint by applying GLPI shared coding standards
 
 ## [2.15.0] - 2026-10-06
 
diff --git a/hook.php b/hook.php
index 18a9fa8..8db6189 100644
--- a/hook.php
+++ b/hook.php
@@ -273,7 +273,7 @@ function plugin_tag_MassiveActions($itemtype = '')
 /**
  * Plugin install process
  *
- * @return boolean
+ * @return bool
  */
 function plugin_tag_install()
 {
@@ -309,7 +309,7 @@ function plugin_tag_install()
 /**
  * Plugin uninstall process
  *
- * @return boolean
+ * @return bool
  */
 function plugin_tag_uninstall()
 {
diff --git a/inc/questiontype.class.php b/inc/questiontype.class.php
index 8178de4..7c32649 100644
--- a/inc/questiontype.class.php
+++ b/inc/questiontype.class.php
@@ -137,7 +137,7 @@ public function getTargetQuestionType(array $rawData): string
     public function getAvailableTags(?Form $form = null): array
     {
         $active_entities_ids = Session::getActiveEntities();
-        if ($active_entities_ids === [] && $form) {
+        if ($active_entities_ids === [] && $form instanceof Form) {
             $active_entities_ids = [$form->getEntityID()];
         }
 
diff --git a/inc/tag.class.php b/inc/tag.class.php
index 06bc739..3389455 100644
--- a/inc/tag.class.php
+++ b/inc/tag.class.php
@@ -814,7 +814,7 @@ public function prepareInputForUpdate($input)
      * Check that the color field, if provided, is a valid hexadecimal color
      *
      * @param array $input
-     * @return boolean
+     * @return bool
      */
     public function checkColorField($input = [])
     {
@@ -850,7 +850,7 @@ public function encodeSubtypes($input)
      * Check all mandatory field are filled
      *
      * @param array $input
-     * @return boolean
+     * @return bool
      */
     public function checkMandatoryFields($input = [])
     {
@@ -876,7 +876,7 @@ public function checkMandatoryFields($input = [])
     /**
      * Retrieve the current itemtype from the current page url
      *
-     * @return string|boolean false if not itemtype found, the string itemtype if found
+     * @return string|bool false if not itemtype found, the string itemtype if found
      */
     public static function getCurrentItemtype()
     {
diff --git a/inc/tagitem.class.php b/inc/tagitem.class.php
index 8bbd800..39e02f4 100644
--- a/inc/tagitem.class.php
+++ b/inc/tagitem.class.php
@@ -152,7 +152,7 @@ public static function uninstall()
     /**
      * Display the list of available itemtype
      *
-     * @return boolean
+     * @return bool
      */
     public static function showForTag(PluginTagTag $tag)
     {
@@ -467,7 +467,7 @@ public static function showForTag(PluginTagTag $tag)
      * Add tags to an item
      *
      *
-     * @return boolean
+     * @return bool
      */
     public static function updateItem(CommonDBTM $item, bool $delete_existing_tags = true)
     {
@@ -584,7 +584,7 @@ private static function keepVisibleTags(array $tag_values): array
     /**
      * Delete all tags associated to an item
      *
-     * @return boolean
+     * @return bool
      */
     public static function purgeItem(CommonDBTM $item)
     {
diff --git a/rector.php b/rector.php
index 54d3dc1..2eeadcc 100644
--- a/rector.php
+++ b/rector.php
@@ -48,6 +48,7 @@
 $config = $baseline([
     __DIR__ . '/ajax',
     __DIR__ . '/inc',
+    __DIR__ . '/src',
     __DIR__ . '/stubs',
     __DIR__ . '/tests',
 ]);
diff --git a/src/Controller/TagItemController.php b/src/Controller/TagItemController.php
index 6a7a571..a88e716 100644
--- a/src/Controller/TagItemController.php
+++ b/src/Controller/TagItemController.php
@@ -35,11 +35,11 @@
 use Glpi\Exception\Http\AccessDeniedHttpException;
 use Glpi\Exception\Http\BadRequestHttpException;
 use Glpi\Http\RedirectResponse;
+use Glpi\Routing\Attribute\ItemtypeFormRoute;
 use Html;
 use PluginTagTag;
 use PluginTagTagItem;
 use Session;
-use Glpi\Routing\Attribute\ItemtypeFormRoute;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 
diff --git a/tests/QuestionTypeTestCase.php b/tests/QuestionTypeTestCase.php
index b9d923e..0e6834e 100644
--- a/tests/QuestionTypeTestCase.php
+++ b/tests/QuestionTypeTestCase.php
@@ -35,7 +35,6 @@
 use Glpi\Controller\Form\RendererController;
 use Glpi\Form\Form;
 use Glpi\Tests\FormTesterTrait;
-use GlpiPlugin\Tag\Tests\TagTestCase;
 use Symfony\Component\DomCrawler\Crawler;
 use Symfony\Component\HttpFoundation\Request;
 
diff --git a/tests/Units/TagTest.php b/tests/Units/TagTest.php
index aabfb6d..d23d0a3 100644
--- a/tests/Units/TagTest.php
+++ b/tests/Units/TagTest.php
@@ -31,9 +31,9 @@
 namespace GlpiPlugin\Tag\Tests\Units;
 
 use DBmysql;
+use Glpi\Search\SearchOption;
 use GlpiPlugin\Tag\Tests\TagTestCase;
 use PluginTagTag;
-use Glpi\Search\SearchOption;
 use Search;
 use Ticket;