diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 67bc411..9441451 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,6 +82,7 @@ jobs:
           - "composer:unused"
           - "json:lint"
           - "php:cs-fixer"
+          - "php:mess"
           - "php:sniff"
           - "php:stan"
           - "typoscript:lint"
diff --git a/Build/phpmd/phpmd.xml b/Build/phpmd/phpmd.xml
new file mode 100644
index 0000000..7f5b84e
--- /dev/null
+++ b/Build/phpmd/phpmd.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0"?>
+<ruleset name="phpList">
+    <description>
+        PHPMD rules for Tea
+    </description>
+
+    <rule ref="rulesets/cleancode.xml/BooleanArgumentFlag"/>
+
+    <rule ref="rulesets/codesize.xml/CyclomaticComplexity"/>
+    <rule ref="rulesets/codesize.xml/NPathComplexity"/>
+    <rule ref="rulesets/codesize.xml/ExcessiveMethodLength"/>
+    <rule ref="rulesets/codesize.xml/ExcessiveClassLength"/>
+    <rule ref="rulesets/codesize.xml/ExcessiveParameterList"/>
+    <rule ref="rulesets/codesize.xml/ExcessivePublicCount"/>
+    <rule ref="rulesets/codesize.xml/TooManyFields"/>
+    <rule ref="rulesets/codesize.xml/TooManyMethods"/>
+    <rule ref="rulesets/codesize.xml/TooManyPublicMethods"/>
+    <rule ref="rulesets/codesize.xml/ExcessiveClassComplexity"/>
+
+    <rule ref="rulesets/controversial.xml/Superglobals"/>
+
+    <rule ref="rulesets/design.xml/ExitExpression"/>
+    <rule ref="rulesets/design.xml/EvalExpression"/>
+    <rule ref="rulesets/design.xml/GotoStatement"/>
+    <rule ref="rulesets/design.xml/NumberOfChildren"/>
+    <rule ref="rulesets/design.xml/DepthOfInheritance"/>
+    <rule ref="rulesets/design.xml/CouplingBetweenObjects"/>
+    <rule ref="rulesets/design.xml/DevelopmentCodeFragment"/>
+
+    <rule ref="rulesets/unusedcode.xml/UnusedPrivateField"/>
+    <rule ref="rulesets/unusedcode.xml/UnusedLocalVariable"/>
+    <rule ref="rulesets/unusedcode.xml/UnusedFormalParameter"/>
+</ruleset>
diff --git a/composer.json b/composer.json
index d28cc2b..830b23d 100644
--- a/composer.json
+++ b/composer.json
@@ -53,6 +53,7 @@
 		"icanhazstring/composer-unused": "^0.8.11",
 		"php-coveralls/php-coveralls": "^2.7.0",
 		"php-parallel-lint/php-parallel-lint": "^1.4",
+		"phpmd/phpmd": "^2.15.0",
 		"phpstan/extension-installer": "^1.4.1",
 		"phpstan/phpstan": "^1.11.8",
 		"phpstan/phpstan-phpunit": "^1.4.0",
@@ -146,6 +147,7 @@
 		],
 		"ci:php:cs-fixer": "php-cs-fixer fix --config .php-cs-fixer.php -v --dry-run --diff",
 		"ci:php:lint": "parallel-lint .*.php *.php Classes Configuration Tests",
+		"ci:php:mess": "phpmd Classes text Build/phpmd/phpmd.xml",
 		"ci:php:sniff": "phpcs Classes Configuration Tests",
 		"ci:php:stan": "phpstan --no-progress",
 		"ci:static": [
@@ -218,6 +220,7 @@
 		"ci:php": "Runs all static checks for the PHP files.",
 		"ci:php:cs-fixer": "Checks the code style with the PHP Coding Standards Fixer (PHP-CS-Fixer).",
 		"ci:php:lint": "Lints the PHP files for syntax errors.",
+		"ci:php:mess": "Runs PHP mess detection.",
 		"ci:php:sniff": "Checks the code style with PHP_CodeSniffer (PHPCS).",
 		"ci:php:stan": "Checks the PHP types using PHPStan.",
 		"ci:static": "Runs all static code checks (syntax, style, types).",