diff --git a/Makefile b/Makefile
index 70f3169..c96ea52 100644
--- a/Makefile
+++ b/Makefile
@@ -30,3 +30,6 @@ run-linux-debug-native: build-linux-debug-container
 
 run-web-debug-native: build-web-debug-container
 	cd build/web && python3 -m http.server $${WEB_PORT:-8081}
+
+ai:
+	qwen --prompt-interactive --yolo "Read CLAUDE.md. Implement first task not already done in TODO.md"
diff --git a/TODO.md b/TODO.md
index f359411..6f22267 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,7 +1,8 @@
 [ ] Means not done
 [x] Means done
 
-- [ ] Unify error reporting. Create class ErrorHandler that get notified of every catched exception. This class prints the exception in stdout.
+- [X] Unify error reporting. Create class ErrorHandler that get notified of every catched exception. This class prints the exception in stdout.
+- [ ] Make formula description collapsable in FormulaScreen. Initialy, the description is visible, but the user can hide it.
 - Refactor formula and unit loading:
   - [ ] Create method `List<Object?> parseD4rtLiteral(String arrayStringLiteral). It parses a d4rt array literal (containing maps and arrays) to a List<Object?> using d4rt
   - [ ] Remove `fromArrayStringLiteral` from UnitSpec and Formula.
@@ -20,3 +21,4 @@
   - [ ] From now on, the corpus will be loaded from database instead of assets
 - [ ] Create method List<UnitSpec> Corpus.withDependencies(Formula formula). It will return the list of units of the formula, and related units from the corpus.
 - [ ] Add a Share button to the formula list. It will export the array string literal of the formula with the units from Corpus.withDependencies().
+- [ ] Replace flutter-markdown with flutter-markdown-plus
diff --git a/lib/ai/formula_screen.dart b/lib/ai/formula_screen.dart
index 24e5e89..7e6d4ec 100644
--- a/lib/ai/formula_screen.dart
+++ b/lib/ai/formula_screen.dart
@@ -65,6 +65,7 @@ class _FormulaScreenState extends State<FormulaScreen> {
   final Map<String, String?> _selectedValues = {}; // for string dropdowns
   String? _result;
   String? _selectedOutputUnit;
+  bool _isDescriptionExpanded = true; // Track description expansion state
 
   @override
   void initState() {
@@ -194,36 +195,45 @@ class _FormulaScreenState extends State<FormulaScreen> {
       return const SizedBox.shrink();
     }
 
-    return Column(
-      crossAxisAlignment: CrossAxisAlignment.start,
-      children: [
-        Text(
+    return Card(
+      margin: const EdgeInsets.only(bottom: 16),
+      child: ExpansionTile(
+        title: Text(
           'Description',
-          style: Theme.of(
-            context,
-          ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
-        ),
-        const SizedBox(height: 8),
-        Container(
-          padding: const EdgeInsets.all(8),
-          decoration: BoxDecoration(
-            color: Theme.of(context).colorScheme.surfaceVariant,
-            borderRadius: BorderRadius.circular(8),
+          style: Theme.of(context).textTheme.titleMedium?.copyWith(
+            fontWeight: FontWeight.bold,
           ),
-          child: MarkdownBody(
-            data: widget.formula.description!,
-            shrinkWrap: true,
-            builders: {
-              'latex': LatexElementBuilder(),
-            },
-            extensionSet: markdown.ExtensionSet(
-              [LatexBlockSyntax()],
-              [LatexInlineSyntax()],
+        ),
+        initiallyExpanded: _isDescriptionExpanded,
+        onExpansionChanged: (bool expanded) {
+          setState(() {
+            _isDescriptionExpanded = expanded;
+          });
+        },
+        children: [
+          Padding(
+            padding: const EdgeInsets.all(16.0),
+            child: Container(
+              padding: const EdgeInsets.all(8),
+              decoration: BoxDecoration(
+                color: Theme.of(context).colorScheme.surfaceVariant,
+                borderRadius: BorderRadius.circular(8),
+              ),
+              child: MarkdownBody(
+                data: widget.formula.description!,
+                shrinkWrap: true,
+                builders: {
+                  'latex': LatexElementBuilder(),
+                },
+                extensionSet: markdown.ExtensionSet(
+                  [LatexBlockSyntax()],
+                  [LatexInlineSyntax()],
+                ),
+              ),
             ),
           ),
-        ),
-        const SizedBox(height: 24),
-      ],
+        ],
+      ),
     );
   }
 
diff --git a/lib/error_handler.dart b/lib/error_handler.dart
index 2b59b4c..8874bda 100644
--- a/lib/error_handler.dart
+++ b/lib/error_handler.dart
@@ -14,16 +14,30 @@ class ErrorHandler {
     // Print the exception to stdout as requested
     print('ErrorHandler caught exception:');
     print(error);
-    
+
     if (stackTrace != null) {
       print('Stack trace:');
       print(stackTrace);
     }
-    
+
     // Call the custom error handler if provided
     onError?.call(error, stackTrace);
   }
 
+  /// Convenience method to wrap code that might throw exceptions
+  T handleError<T>(T Function() operation, {T? defaultValue}) {
+    try {
+      return operation();
+    } catch (error, stackTrace) {
+      notify(error, stackTrace);
+
+      if (defaultValue != null) {
+        return defaultValue;
+      }
+
+      rethrow;
+    }
+  }
 }
 
 /// Global instance of ErrorHandler for easy access
diff --git a/test/error_handler_test.dart b/test/error_handler_test.dart
index 423ef0b..0105ca8 100644
--- a/test/error_handler_test.dart
+++ b/test/error_handler_test.dart
@@ -31,10 +31,10 @@ void main() {
         errors.add(error);
       };
       
-      int result = errorHandler.handleError(() => 42, defaultValue: 0);
+      int result = ErrorHandler().handleError(() => 42, defaultValue: 0);
       expect(result, 42);
       
-      result = errorHandler.handleError(() {
+      result = ErrorHandler().handleError(() {
         throw Exception('Handled exception');
       }, defaultValue: 100);
       
@@ -49,7 +49,7 @@ void main() {
       };
       
       expect(() {
-        errorHandler.handleError(() {
+        ErrorHandler().handleError(() {
           throw Exception('Rethrown exception');
         });
       }, throwsA(const TypeMatcher<Exception>()));