diff --git a/app.py b/app.py
index d7892bd..0ce6800 100644
--- a/app.py
+++ b/app.py
@@ -32,6 +32,11 @@ def internal_server_error(error):
     """Render a friendly 500 page for unexpected server errors."""
     return render_template("500.html"), 500
 
+  
+@app.route('/health')
+def health_check():
+    return {'status': 'ok'}, 200
+
 
 if __name__ == "__main__":
     # debug=True is only for local development.
diff --git a/main_test.py b/main_test.py
new file mode 100644
index 0000000..80435f2
Binary files /dev/null and b/main_test.py differ
diff --git a/static/script.js b/static/script.js
index d4de221..18c5dc3 100644
--- a/static/script.js
+++ b/static/script.js
@@ -305,23 +305,32 @@ if (isIndexPage) {
     }
   });
 
+ function addSkill(rawSkill) {
   //add a skill to the list if it's not empty or a duplicate
   function addSkill(rawSkill) {
     // Clean up any extra spaces and match to canonical skill name
     var skill = getCanonicalSkill(rawSkill);
-    // Nothing to add if string is empty after trimming
     if (!skill) return;
 
-    // Block duplicate entries (case-insensitive)
+    // Validate against available skills list
+    var isValid = availableSkills.some(function(s) {
+        return s.toLowerCase() === skill.toLowerCase();
+    });
+
+    if (!isValid) {
+        showFieldError("skills-error",
+        '"' + skill + '" is not a recognized skill. Please select from the available list.');
+        return;
+    }
+
     if (isSkillSelected(skill)) return;
 
     selectedSkills.push(skill);
     renderSelectedChips();
     syncSkillsHiddenInput();
     updateQuickPickState();
-    // Once a skill is added, remove the "please add a skill" error if it was showing
     clearFieldError("skills-error");
-  }
+}
 
   // remove a skill from the list and update the UI accordingly
   function removeSkill(skill) {
@@ -842,3 +851,4 @@ if (scrollTopBtn) {
     window.addEventListener('scroll', handleScroll);
     scrollTopBtn.addEventListener('click', scrollToTop);
 }
+}
\ No newline at end of file
diff --git a/tests/test_basic.py b/tests/test_basic.py
index a66c75b..148d8f6 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -12,7 +12,6 @@
 
 import sys
 import os
-
 # Allow imports from the project root when running tests directly
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
 
@@ -296,7 +295,19 @@ def test_scoring_weights_has_all_keys():
     expected_keys = {"skill", "level", "interest", "time"}
     assert set(SCORING_WEIGHTS.keys()) == expected_keys
 
+def client():
+    app.config["TESTING"] = True
+    with app.test_client() as client:
+        yield client
 
+def test_health_check():
+    client = get_client()
+    response = client.get("/health")
+    assert response.status_code == 200
+    data = response.get_json()
+    assert "status" in data
+    assert "version" in data
+    assert data["status"] == "ok"
 # ============================================================
 # Run tests directly (no pytest required)
 # ============================================================