diff --git a/.github/workflows/code_analysis.yaml b/.github/workflows/code_analysis.yaml
index 1670042a6bc..84de1b31a50 100644
--- a/.github/workflows/code_analysis.yaml
+++ b/.github/workflows/code_analysis.yaml
@@ -36,6 +36,10 @@ jobs:
                         name: 'Avoid duplicate short class names'
                         run: php scripts/unique-rector-short-class-name.php
 
+                    -
+                        name: 'Validate rule definitions'
+                        run: php scripts/validate-rule-definitions.php
+
                     -
                         name: 'Help and Version'
                         run:
diff --git a/rules/DeadCode/Rector/Class_/RemoveRefactorDuplicatedNodeInstanceCheckRector.php b/rules/DeadCode/Rector/Class_/RemoveRefactorDuplicatedNodeInstanceCheckRector.php
index 1aebff9b4a1..4308015a630 100644
--- a/rules/DeadCode/Rector/Class_/RemoveRefactorDuplicatedNodeInstanceCheckRector.php
+++ b/rules/DeadCode/Rector/Class_/RemoveRefactorDuplicatedNodeInstanceCheckRector.php
@@ -19,6 +19,7 @@
 use Rector\PHPStan\ScopeFetcher;
 use Rector\Rector\AbstractRector;
 use Rector\StaticTypeMapper\ValueObject\Type\ShortenedObjectType;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
 use Webmozart\Assert\Assert;
 
@@ -37,7 +38,46 @@ public function getRuleDefinition(): RuleDefinition
     {
         return new RuleDefinition(
             'Remove refactor() method of Rector rule double check of $classMethod instance, if already defined in @param type',
-            []
+            [
+                new CodeSample(
+                    <<<'CODE_SAMPLE'
+final class SomeRector extends AbstractRector
+{
+    public function getNodeTypes(): array
+    {
+        return [ClassMethod::class];
+    }
+
+    /**
+     * @param ClassMethod $node
+     */
+    public function refactor(Node $node)
+    {
+        if (! $node instanceof ClassMethod) {
+            return null;
+        }
+    }
+}
+CODE_SAMPLE
+                    ,
+                    <<<'CODE_SAMPLE'
+final class SomeRector extends AbstractRector
+{
+    public function getNodeTypes(): array
+    {
+        return [ClassMethod::class];
+    }
+
+    /**
+     * @param ClassMethod $node
+     */
+    public function refactor(Node $node)
+    {
+    }
+}
+CODE_SAMPLE
+                ),
+            ]
         );
     }
 
diff --git a/scripts/validate-rule-definitions.php b/scripts/validate-rule-definitions.php
new file mode 100644
index 00000000000..6a1c4b1f42c
--- /dev/null
+++ b/scripts/validate-rule-definitions.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Console\ExitCode;
+use Rector\Scripts\Finder\RectorClassFinder;
+use Symfony\Component\Console\Input\ArrayInput;
+use Symfony\Component\Console\Output\ConsoleOutput;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use Symplify\RuleDocGenerator\Contract\DocumentedRuleInterface;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+$symfonyStyle = new SymfonyStyle(new ArrayInput([]), new ConsoleOutput());
+
+// core rules + all installed rector extensions (rector-doctrine, rector-symfony, rector-phpunit, ...)
+$ruleDirectories = array_merge(
+    [__DIR__ . '/../rules'],
+    glob(__DIR__ . '/../vendor/rector/rector-*', GLOB_ONLYDIR) ?: []
+);
+
+$rectorClassFinder = new RectorClassFinder();
+$rectorClasses = $rectorClassFinder->find($ruleDirectories);
+
+$errorMessages = [];
+
+foreach ($rectorClasses as $rectorClass) {
+    $reflectionClass = new ReflectionClass($rectorClass);
+
+    // rule definition does not depend on constructor dependencies, skip them
+    $rector = $reflectionClass->newInstanceWithoutConstructor();
+    if (! $rector instanceof DocumentedRuleInterface) {
+        continue;
+    }
+
+    $ruleDefinition = $rector->getRuleDefinition();
+
+    if (trim($ruleDefinition->getDescription()) === '') {
+        $errorMessages[] = sprintf('Rule "%s" is missing a clear description', $rectorClass);
+    }
+
+    $codeSamples = $ruleDefinition->getCodeSamples();
+    if ($codeSamples === []) {
+        $errorMessages[] = sprintf('Rule "%s" is missing at least one code sample', $rectorClass);
+        continue;
+    }
+
+    foreach ($codeSamples as $codeSample) {
+        if (trim($codeSample->getBadCode()) === '' || trim($codeSample->getGoodCode()) === '') {
+            $errorMessages[] = sprintf('Rule "%s" has an empty code sample, fill before/after code', $rectorClass);
+            break;
+        }
+    }
+}
+
+if ($errorMessages !== []) {
+    $symfonyStyle->listing($errorMessages);
+    $symfonyStyle->error(sprintf('Found %d rule definition error(s), see above', count($errorMessages)));
+
+    exit(ExitCode::FAILURE);
+}
+
+$symfonyStyle->writeln('Scanned paths:');
+$symfonyStyle->listing(array_map(static fn (string $directory): string => realpath($directory), $ruleDirectories));
+
+$symfonyStyle->success(sprintf('All %d Rector rule definitions are valid!', count($rectorClasses)));
+
+exit(ExitCode::SUCCESS);