diff --git a/.github/bin/phpcs-branch.php b/.github/bin/phpcs-branch.php
index 1ce95a83cf..e1e464dd50 100644
--- a/.github/bin/phpcs-branch.php
+++ b/.github/bin/phpcs-branch.php
@@ -12,7 +12,7 @@
 namespace WordPressOrg\Bin\PHPCS_Changed;
 
 function run_phpcs( $file, $bin_dir ) {
-	exec( "$bin_dir/phpcs $file -snq", $output, $exec_exit_status );
+	exec( "$bin_dir/phpcs $file --standard=./phpcs-clean.xml.dist -snq", $output, $exec_exit_status );
 	echo implode( "\n", $output );
 	return $exec_exit_status;
 }
@@ -27,10 +27,10 @@ function run_phpcs_changed( $file, $git, $base_branch, $bin_dir ) {
 	exec( "$git diff $base_branch $file > $name.diff" );
 
 	exec( "$git show $base_branch:$file > $name.test.php" );
-	exec( "$bin_dir/phpcs $name.test.php --standard=./phpcs.xml.dist --report=json -snq > $name.orig.phpcs" );
+	exec( "$bin_dir/phpcs $name.test.php --standard=./phpcs-clean.xml.dist --report=json -snq > $name.orig.phpcs" );
 
 	exec( "cat $file > $name.test.php" );
-	exec( "$bin_dir/phpcs $name.test.php --standard=./phpcs.xml.dist --report=json -snq > $name.phpcs" );
+	exec( "$bin_dir/phpcs $name.test.php --standard=./phpcs-clean.xml.dist --report=json -snq > $name.phpcs" );
 
 	$cmd = "$bin_dir/phpcs-changed --diff $name.diff --phpcs-orig $name.orig.phpcs --phpcs-new $name.phpcs";
 	exec( $cmd, $output, $exec_exit_status );
diff --git a/.github/workflows/phpcs.yml b/.github/workflows/phpcs.yml
index 5c461cdaab..d25f168b5a 100644
--- a/.github/workflows/phpcs.yml
+++ b/.github/workflows/phpcs.yml
@@ -5,6 +5,7 @@ on:
     paths:
     - '**.php'
     - phpcs.xml.dist
+    - phpcs-clean.xml.dist
     - composer.json
     - .github/workflows/phpcs.yml
     - .github/bin/phpcs-branch.php
diff --git a/phpcs-clean.xml.dist b/phpcs-clean.xml.dist
new file mode 100644
index 0000000000..2a2b3e5bb2
--- /dev/null
+++ b/phpcs-clean.xml.dist
@@ -0,0 +1,35 @@
+<?xml version="1.0" ?>
+<ruleset name="WordPress.org Coding Standards (Clean)">
+	<description>Full WordPress Coding Standards, applied to changed lines and new files only (via .github/bin/phpcs-branch.php). No sniff exclusions — new code is held to the stock standard.</description>
+
+	<!-- Show sniff codes in all reports -->
+	<arg value="ps" />
+	<arg name="colors" />
+
+	<!-- Exclude 3rd-party files -->
+	<exclude-pattern>*/vendor/*</exclude-pattern>
+	<exclude-pattern>*/node_modules/*</exclude-pattern>
+	<exclude-pattern>*/plugins/plugin-directory/libs/*</exclude-pattern>
+	<exclude-pattern>*/plugins/theme-directory/lib/*</exclude-pattern>
+	<exclude-pattern>*/plugins/wpf-stripe/stripe-php/*</exclude-pattern>
+
+	<!-- Exclude generated wp-scripts asset files. -->
+	<exclude-pattern>*/plugins/*/build/index.asset.php</exclude-pattern>
+
+	<!-- Exclude JS/CSS files. -->
+	<exclude-pattern>*.js[x]?</exclude-pattern>
+	<exclude-pattern>*.[s]?css</exclude-pattern>
+
+	<!-- Scan all (php) files in the current folder and subfolders -->
+	<file>.</file>
+	<arg name="extensions" value="php" />
+
+	<!-- WordPress.org runs recent versions of WordPress. -->
+	<config name="minimum_wp_version" value="6.9"/>
+
+	<!-- Check for PHP cross-version compatibility. -->
+	<config name="testVersion" value="8.4-"/>
+	<rule ref="PHPCompatibilityWP"/>
+
+	<rule ref="WordPress"/>
+</ruleset>