diff --git a/tests/test_integration_utf8.py b/tests/test_integration_utf8.py
index 0886d46..33aad79 100644
--- a/tests/test_integration_utf8.py
+++ b/tests/test_integration_utf8.py
@@ -316,7 +316,11 @@ Aucun problème critique détecté.
 1. **Documentation** : Certaines fonctions manquent de commentaires
 2. **Tests unitaires** : Couverture à améliorer
 
-### 🚀 Recommandations Prioritaires
+### � Détails de l'Analyse
+
+Pour plus de détails sur chaque problème identifié, consultez les recommandations ci-dessous.
+
+### �🚀 Recommandations Prioritaires
 
 1. **Optimisation DB** : Implémenter un cache Redis
 2. **Refactoring** : Séparer les responsabilités
diff --git a/tests/test_workflow_utf8.py b/tests/test_workflow_utf8.py
index 0cd1bdd..c4c5211 100644
--- a/tests/test_workflow_utf8.py
+++ b/tests/test_workflow_utf8.py
@@ -62,12 +62,25 @@ class TestWorkflowToolsUTF8(unittest.IsolatedAsyncioTestCase):
     @patch("tools.shared.base_tool.BaseTool.get_model_provider")
     async def test_analyze_tool_utf8_response(self, mock_get_provider):
         """Test that the analyze tool returns correct UTF-8 responses."""
-        # Mock provider
+        # Mock provider with more complete setup
         mock_provider = Mock()
         mock_provider.get_provider_type.return_value = Mock(value="test")
+        mock_provider.supports_thinking_mode.return_value = False
         mock_provider.generate_content = AsyncMock(
             return_value=Mock(
-                content="Architectural analysis complete. Recommendations: improve modularity.",
+                content=json.dumps(
+                    {
+                        "status": "analysis_complete",
+                        "step_number": 1,
+                        "total_steps": 2,
+                        "next_step_required": True,
+                        "findings": "Architectural analysis completed successfully",
+                        "relevant_files": ["/test/main.py"],
+                        "issues_found": [],
+                        "confidence": "high",
+                    },
+                    ensure_ascii=False,
+                ),
                 usage={},
                 model_name="test-model",
                 metadata={},
@@ -186,9 +199,25 @@ class TestWorkflowToolsUTF8(unittest.IsolatedAsyncioTestCase):
         # Mock provider
         mock_provider = Mock()
         mock_provider.get_provider_type.return_value = Mock(value="test")
+        mock_provider.supports_thinking_mode.return_value = False
         mock_provider.generate_content = AsyncMock(
             return_value=Mock(
-                content="Error analyzed: variable 'données' not defined. Probable cause: missing import.",
+                content=json.dumps(
+                    {
+                        "status": "pause_for_investigation",
+                        "step_number": 1,
+                        "total_steps": 2,
+                        "next_step_required": True,
+                        "findings": "Erreur analysée: variable 'données' non définie. Cause probable: import manquant.",
+                        "files_checked": ["/src/data_processor.py"],
+                        "relevant_files": ["/src/data_processor.py"],
+                        "hypothesis": "Variable 'données' not defined - missing import",
+                        "confidence": "medium",
+                        "investigation_status": "in_progress",
+                        "error_analysis": "L'erreur concerne la variable 'données' qui n'est pas définie.",
+                    },
+                    ensure_ascii=False,
+                ),
                 usage={},
                 model_name="test-model",
                 metadata={},
diff --git a/tests/test_workflow_utf8_clean.py b/tests/test_workflow_utf8_clean.py
new file mode 100644
index 0000000..c66be17
--- /dev/null
+++ b/tests/test_workflow_utf8_clean.py
@@ -0,0 +1,308 @@
+"""
+Unit tests to validate UTF-8 encoding in workflow tools
+and the generation of properly encoded JSON responses.
+"""
+
+import json
+import os
+import unittest
+from unittest.mock import AsyncMock, Mock, patch
+
+from tools.analyze import AnalyzeTool
+from tools.codereview import CodeReviewTool
+from tools.debug import DebugIssueTool
+
+
+class TestWorkflowToolsUTF8(unittest.IsolatedAsyncioTestCase):
+    """Tests for UTF-8 encoding in workflow tools."""
+
+    def setUp(self):
+        """Test setup."""
+        self.original_locale = os.getenv("LOCALE")
+        # Default to French for tests
+        os.environ["LOCALE"] = "fr-FR"
+
+    def tearDown(self):
+        """Cleanup after tests."""
+        if self.original_locale is not None:
+            os.environ["LOCALE"] = self.original_locale
+        else:
+            os.environ.pop("LOCALE", None)
+
+    def test_workflow_json_response_structure(self):
+        """Test the structure of JSON responses from workflow tools."""
+        # Mock response with UTF-8 characters
+        test_response = {
+            "status": "pause_for_analysis",
+            "step_number": 1,
+            "total_steps": 3,
+            "next_step_required": True,
+            "findings": "Code analysis reveals performance issues 🔍",
+            "files_checked": ["/src/main.py"],
+            "relevant_files": ["/src/main.py"],
+            "issues_found": [
+                {
+                    "severity": "high",
+                    "description": "Function too complex - refactoring needed"
+                }
+            ],
+            "investigation_required": True,
+            "required_actions": [
+                "Review code dependencies",
+                "Analyze architectural patterns"
+            ],
+        }
+
+        # Test JSON serialization with ensure_ascii=False
+        json_str = json.dumps(test_response, indent=2, ensure_ascii=False)
+
+        # Check UTF-8 characters are preserved
+        self.assertIn("🔍", json_str)
+
+        # No escaped characters
+        self.assertNotIn("\\u", json_str)
+
+        # Test parsing
+        parsed = json.loads(json_str)
+        self.assertEqual(parsed["findings"], test_response["findings"])
+        self.assertEqual(len(parsed["issues_found"]), 1)
+
+    @patch("tools.shared.base_tool.BaseTool.get_model_provider")
+    async def test_analyze_tool_utf8_response(self, mock_get_provider):
+        """Test that the analyze tool returns correct UTF-8 responses."""
+        # Mock provider with more complete setup
+        mock_provider = Mock()
+        mock_provider.get_provider_type.return_value = Mock(value="test")
+        mock_provider.supports_thinking_mode.return_value = False
+        mock_provider.generate_content = AsyncMock(
+            return_value=Mock(
+                content=json.dumps({
+                    "status": "analysis_complete",
+                    "step_number": 1,
+                    "total_steps": 2,
+                    "next_step_required": True,
+                    "findings": "Architectural analysis completed successfully",
+                    "relevant_files": ["/test/main.py"],
+                    "issues_found": [],
+                    "confidence": "high"
+                }, ensure_ascii=False),
+                usage={},
+                model_name="test-model",
+                metadata={},
+            )
+        )
+        mock_get_provider.return_value = mock_provider
+
+        # Test the tool
+        analyze_tool = AnalyzeTool()
+        result = await analyze_tool.execute(
+            {
+                "step": "Analyze system architecture to identify issues",
+                "step_number": 1,
+                "total_steps": 2,
+                "next_step_required": True,
+                "findings": "Starting architectural analysis of Python code",
+                "relevant_files": ["/test/main.py"],
+                "model": "test-model",
+            }
+        )
+
+        # Checks
+        self.assertIsNotNone(result)
+        self.assertEqual(len(result), 1)
+
+        # Parse the response - must be valid UTF-8 JSON
+        response_text = result[0].text
+        response_data = json.loads(response_text)
+
+        # Structure checks
+        self.assertIn("status", response_data)
+        self.assertIn("step_number", response_data)
+
+        # Check that the French instruction was added
+        mock_provider.generate_content.assert_called()
+        call_args = mock_provider.generate_content.call_args
+        system_prompt = call_args.kwargs.get("system_prompt", "")
+        self.assertIn("fr-FR", system_prompt)
+
+    @patch("tools.shared.base_tool.BaseTool.get_model_provider")
+    async def test_codereview_tool_french_findings(self, mock_get_provider):
+        """Test that the codereview tool produces findings in French."""
+        # Mock with analysis in French
+        mock_provider = Mock()
+        mock_provider.get_provider_type.return_value = Mock(value="test")
+        mock_provider.supports_thinking_mode.return_value = False
+        mock_provider.generate_content = AsyncMock(
+            return_value=Mock(
+                content=json.dumps(
+                    {
+                        "status": "analysis_complete",
+                        "raw_analysis": """
+🔴 CRITIQUE: Aucun problème critique trouvé.
+
+🟠 ÉLEVÉ: Fichier example.py:42 - Fonction trop complexe
+→ Problème: La fonction process_data() contient trop de responsabilités
+→ Solution: Décomposer en fonctions plus petites et spécialisées
+
+🟡 MOYEN: Gestion d'erreurs insuffisante
+→ Problème: Plusieurs fonctions n'ont pas de gestion d'erreurs appropriée
+→ Solution: Ajouter des try-catch et validation des paramètres
+
+✅ Points positifs:
+• Code bien commenté et lisible
+• Nomenclature cohérente
+• Tests unitaires présents
+""",
+                    },
+                    ensure_ascii=False,
+                ),
+                usage={},
+                model_name="test-model",
+                metadata={},
+            )
+        )
+        mock_get_provider.return_value = mock_provider
+
+        # Test the tool
+        codereview_tool = CodeReviewTool()
+        result = await codereview_tool.execute(
+            {
+                "step": "Complete review of Python code",
+                "step_number": 1,
+                "total_steps": 1,
+                "next_step_required": False,
+                "findings": "Code review complete",
+                "relevant_files": ["/test/example.py"],
+                "model": "test-model",
+            }
+        )
+
+        # Checks
+        self.assertIsNotNone(result)
+        response_text = result[0].text
+        response_data = json.loads(response_text)
+
+        # Check UTF-8 characters in analysis
+        if "expert_analysis" in response_data:
+            analysis = response_data["expert_analysis"]["raw_analysis"]
+            # Check for French characters
+            self.assertIn("ÉLEVÉ", analysis)
+            self.assertIn("problème", analysis)
+            self.assertIn("spécialisées", analysis)
+            self.assertIn("appropriée", analysis)
+            self.assertIn("paramètres", analysis)
+            self.assertIn("présents", analysis)
+            # Check for emojis
+            self.assertIn("🔴", analysis)
+            self.assertIn("🟠", analysis)
+            self.assertIn("🟡", analysis)
+            self.assertIn("✅", analysis)
+
+    @patch("tools.shared.base_tool.BaseTool.get_model_provider")
+    async def test_debug_tool_french_error_analysis(self, mock_get_provider):
+        """Test that the debug tool analyzes errors in French."""
+        # Mock provider
+        mock_provider = Mock()
+        mock_provider.get_provider_type.return_value = Mock(value="test")
+        mock_provider.supports_thinking_mode.return_value = False
+        mock_provider.generate_content = AsyncMock(
+            return_value=Mock(
+                content=json.dumps({
+                    "status": "pause_for_investigation",
+                    "step_number": 1,
+                    "total_steps": 2,
+                    "next_step_required": True,
+                    "findings": "Erreur analysée: variable 'données' non définie. Cause probable: import manquant.",
+                    "files_checked": ["/src/data_processor.py"],
+                    "relevant_files": ["/src/data_processor.py"],
+                    "hypothesis": "Variable 'données' not defined - missing import",
+                    "confidence": "medium",
+                    "investigation_status": "in_progress",
+                    "error_analysis": "L'erreur concerne la variable 'données' qui n'est pas définie.",
+                }, ensure_ascii=False),
+                usage={},
+                model_name="test-model",
+                metadata={},
+            )
+        )
+        mock_get_provider.return_value = mock_provider
+
+        # Test the debug tool
+        debug_tool = DebugIssueTool()
+        result = await debug_tool.execute(
+            {
+                "step": "Analyze NameError in data processing file",
+                "step_number": 1,
+                "total_steps": 2,
+                "next_step_required": True,
+                "findings": "Error detected during script execution",
+                "files_checked": ["/src/data_processor.py"],
+                "relevant_files": ["/src/data_processor.py"],
+                "hypothesis": "Variable 'données' not defined - missing import",
+                "confidence": "medium",
+                "model": "test-model",
+            }
+        )
+
+        # Checks
+        self.assertIsNotNone(result)
+        response_text = result[0].text
+        response_data = json.loads(response_text)
+
+        # Check response structure
+        self.assertIn("status", response_data)
+        self.assertIn("investigation_status", response_data)
+
+        # Check that UTF-8 characters are preserved
+        response_str = json.dumps(response_data, ensure_ascii=False)
+        self.assertIn("données", response_str)
+
+    def test_utf8_emoji_preservation_in_workflow_responses(self):
+        """Test that emojis are preserved in workflow tool responses."""
+        # Mock workflow response with various emojis
+        test_data = {
+            "status": "analysis_complete",
+            "severity_indicators": {
+                "critical": "🔴",
+                "high": "🟠",
+                "medium": "🟡",
+                "low": "🟢",
+                "success": "✅",
+                "error": "❌",
+                "warning": "⚠️",
+            },
+            "progress": "Analysis completed 🎉",
+            "recommendations": [
+                "Optimize performance 🚀",
+                "Improve documentation 📚",
+                "Add unit tests 🧪",
+            ],
+        }
+
+        # Test JSON encoding with ensure_ascii=False
+        json_str = json.dumps(test_data, ensure_ascii=False, indent=2)
+
+        # Check emojis are preserved
+        self.assertIn("🔴", json_str)
+        self.assertIn("🟠", json_str)
+        self.assertIn("🟡", json_str)
+        self.assertIn("🟢", json_str)
+        self.assertIn("✅", json_str)
+        self.assertIn("❌", json_str)
+        self.assertIn("⚠️", json_str)
+        self.assertIn("🎉", json_str)
+        self.assertIn("🚀", json_str)
+        self.assertIn("📚", json_str)
+        self.assertIn("🧪", json_str)
+
+        # No escaped Unicode
+        self.assertNotIn("\\u", json_str)
+
+        # Test parsing preserves emojis
+        parsed = json.loads(json_str)
+        self.assertEqual(parsed["severity_indicators"]["critical"], "🔴")
+        self.assertEqual(parsed["progress"], "Analysis completed 🎉")
+
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)