diff --git a/.env/0-sandbox.php b/.env/0-sandbox.php
new file mode 100644
index 0000000..d36c4d2
--- /dev/null
+++ b/.env/0-sandbox.php
@@ -0,0 +1,15 @@
+<?php
+/*
+ * These are stubs for closed source code, or things that only apply to local environments.
+ */
+
+
+namespace {
+	defined( 'WPINC' ) || die();
+
+	/**
+	 * Stub.
+	 */
+	function bump_stats_extra( $name, $value, $views = 1 ) {
+	}
+}
diff --git a/.gitignore b/.gitignore
index 79cd9db..552747c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.js.map
 
 mu-plugins/vendor
+mu-plugins/0-sandbox.php
 node_modules
 
 plugins/*
diff --git a/README.md b/README.md
index aceb458..0973b68 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@ In order to contribute with code changes, you'll want to set up a local environm
 1. Run `git clone git@github.com:[your username]/five-for-the-future.git wp-content`, replacing `[your username]` with your github username to clone your forked repo.
 1. Ensure this newly cloned `wp-content` folder is where it should be in the WP structure.
 1. Copy over the base theme with: `svn export https://meta.svn.wordpress.org/sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg themes/pub/wporg` (this should be run from the `wp-content` folder).
+1. Install the sandbox mu-plugin with `cd wp-content && mkdir mu-plugins && ln -s .env/0-sandbox.php mu-plugins/0-sandbox.php`
 1. If you are making changes to the plugins, you can run `composer install` at `/wp-content/plugins/wporg-5ftf` and then `composer run test` to run the WP unit tests.
 
 ### Configuring the site