diff --git a/core/phpcs.xml b/core/phpcs.xml
new file mode 100644
index 0000000..e302408
--- /dev/null
+++ b/core/phpcs.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="drupal_core">
+  <description>Default PHP CodeSniffer configuration for Drupal core.</description>
+  <file>.</file>
+  <arg name="extensions" value="inc,install,module,php,profile,test,theme"/>
+
+  <!--Exclude third party code.-->
+  <exclude-pattern>./assets/vendor/*</exclude-pattern>
+
+  <!--Exclude test files that are intentionally empty, or intentionally violate coding standards.-->
+  <exclude-pattern>./modules/system/tests/fixtures/HtaccessTest</exclude-pattern>
+
+  <!-- Only include specific sniffs that pass. This ensures that, if new sniffs are added, HEAD does not fail.-->
+  <rule ref="Drupal.Commenting.InlineComment.SpacingAfter"/>
+
+</ruleset>