diff --git a/README.md b/README.md
index 409a329..6a312f3 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
-# gandalf-gate
-
-A tiny guard utility — you shall not pass invalid input.
\ No newline at end of file
+# gandalf-gate 🧙
+A tiny guard utility.
+```js
+const { youShallNotPass, gatekeeper } = require('@community/gandalf-gate');
+youShallNotPass(user.isAdmin, 'admins only');
+const gate = gatekeeper(3); // allow 3, then throws
+```
diff --git a/gate.js b/gate.js
new file mode 100644
index 0000000..c1e9c8a
--- /dev/null
+++ b/gate.js
@@ -0,0 +1,10 @@
+// gandalf-gate — a tiny guard utility. "You shall not pass" invalid input.
+function youShallNotPass(condition, message = 'You shall not pass!') {
+  if (!condition) throw new Error(message);
+}
+// A simple gatekeeper: allow at most `max` calls, then refuse.
+function gatekeeper(max) {
+  let count = 0;
+  return () => { if (count++ >= max) throw new Error('You shall not pass! (limit reached)'); };
+}
+module.exports = { youShallNotPass, gatekeeper };
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..5e2560b
--- /dev/null
+++ b/package.json
@@ -0,0 +1,2 @@
+{ "name": "@community/gandalf-gate", "version": "1.0.0", "main": "gate.js", "license": "MIT",
+  "description": "A tiny guard utility — you shall not pass invalid input." }
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..2ef8675
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+node -e "const {youShallNotPass,gatekeeper}=require('./gate'); youShallNotPass(true); let g=gatekeeper(1); g(); try{g();process.exit(1)}catch{console.log('ok')}"