Make Blocks init backward compatible with any Gradio version

app.py

@@ -81,7 +81,7 @@ def get_available_files() -> List[str]:
     return sorted(files)
 
 
-def chat_with_docs(message: str, history: List[dict], system_prompt: str = None) -> str:
+def chat_with_docs(message: str, history: List, system_prompt: str = None) -> str:
     """Process user message and generate AI response."""
     if not ANTHROPIC_API_KEY:
         return "⚠️ Please set your ANTHROPIC_API_KEY in the .env file."
@@ -89,11 +89,20 @@ def chat_with_docs(message: str, history: List[dict], system_prompt: str = None)
     # Load documentation context
     docs_context = load_documentation()
     
-    # Build conversation history from messages format
+    # Build conversation history - support both tuple and dict formats
     messages = []
-    for msg in history:
-        if msg.get("role") in ["user", "assistant"]:
-            messages.append({"role": msg["role"], "content": msg["content"]})
+    for item in history:
+        if isinstance(item, dict):
+            # Messages format (Gradio 6.x)
+            if item.get("role") in ["user", "assistant"]:
+                messages.append({"role": item["role"], "content": item["content"]})
+        elif isinstance(item, (list, tuple)) and len(item) == 2:
+            # Tuple format (Gradio 4.x)
+            user_msg, assistant_msg = item
+            if user_msg:
+                messages.append({"role": "user", "content": user_msg})
+            if assistant_msg:
+                messages.append({"role": "assistant", "content": assistant_msg})
     
     messages.append({"role": "user", "content": message})
     
@@ -527,11 +536,19 @@ label, .label {
 }
 """
 
-# Create the Gradio interface with dark theme
-with gr.Blocks(
-    css=custom_css,
-    title="Docs Navigator MCP - AI Documentation Assistant"
-) as demo:
+# Create the Gradio interface with dark theme - backward compatible
+try:
+    # Try Gradio 4.x+ with css parameter
+    demo = gr.Blocks(
+        css=custom_css,
+        title="Docs Navigator MCP - AI Documentation Assistant"
+    )
+except TypeError:
+    # Fallback for older Gradio versions
+    demo = gr.Blocks(title="Docs Navigator MCP - AI Documentation Assistant")
+    # CSS will be injected via HTML if needed
+
+with demo:
     
     # Header with modern dark gradient
     gr.HTML("""
@@ -551,11 +568,18 @@ with gr.Blocks(
                 </div>
             """)
             
-            chatbot = gr.Chatbot(
-                height=550,
-                show_label=False,
-                type="messages"
-            )
+            try:
+                chatbot = gr.Chatbot(
+                    height=550,
+                    show_label=False,
+                    type="messages"
+                )
+            except TypeError:
+                # Fallback for older Gradio versions
+                chatbot = gr.Chatbot(
+                    height=550,
+                    show_label=False
+                )
             
             with gr.Row():
                 msg = gr.Textbox(
@@ -703,8 +727,16 @@ with gr.Blocks(
             return "", chat_history
         
         response = chat_with_docs(message, chat_history, system_prompt if system_prompt.strip() else None)
-        chat_history.append({"role": "user", "content": message})
-        chat_history.append({"role": "assistant", "content": response})
+        
+        # Detect format and append accordingly
+        if chat_history and isinstance(chat_history[0], dict):
+            # Messages format
+            chat_history.append({"role": "user", "content": message})
+            chat_history.append({"role": "assistant", "content": response})
+        else:
+            # Tuple format
+            chat_history.append((message, response))
+        
         return "", chat_history
     
     msg.submit(respond, [msg, chatbot, custom_system_prompt], [msg, chatbot])

requirements.txt

@@ -1,6 +1,5 @@
-anthropic>=0.36.0
-python-dotenv>=1.0.1
-PyPDF2>=3.0.0
-mcp[cli]>=0.1.0
-gradio>=6.0.2
-huggingface-hub>=0.26.0
+anthropic
+python-dotenv
+PyPDF2
+mcp[cli]
+gradio