Python MCP client - add ruff

mcp-client-python/client.py

@@ -1,34 +1,33 @@
 import asyncio
-from typing import Optional
 from contextlib import AsyncExitStack
-
-from mcp import ClientSession, StdioServerParameters
-from mcp.client.stdio import stdio_client
+from pathlib import Path
 
 from anthropic import Anthropic
 from dotenv import load_dotenv
-from pathlib import Path
+from mcp import ClientSession, StdioServerParameters
+from mcp.client.stdio import stdio_client
 
 load_dotenv()  # load environment variables from .env
 
 # Claude model constant
 ANTHROPIC_MODEL = "claude-sonnet-4-5"
 
+
 class MCPClient:
     def __init__(self):
         # Initialize session and client objects
-        self.session: Optional[ClientSession] = None
+        self.session: ClientSession | None = None
         self.exit_stack = AsyncExitStack()
         self.anthropic = Anthropic()
 
     async def connect_to_server(self, server_script_path: str):
         """Connect to an MCP server
-        
+
         Args:
             server_script_path: Path to the server script (.py or .js)
         """
-        is_python = server_script_path.endswith('.py')
-        is_js = server_script_path.endswith('.js')
+        is_python = server_script_path.endswith(".py")
+        is_js = server_script_path.endswith(".js")
         if not (is_python or is_js):
             raise ValueError("Server script must be a .py or .js file")
 
@@ -40,16 +39,14 @@ class MCPClient:
                 env=None,
             )
         else:
-            server_params = StdioServerParameters(
-                command="node", args=[server_script_path], env=None
-            )
+            server_params = StdioServerParameters(command="node", args=[server_script_path], env=None)
 
         stdio_transport = await self.exit_stack.enter_async_context(stdio_client(server_params))
         self.stdio, self.write = stdio_transport
         self.session = await self.exit_stack.enter_async_context(ClientSession(self.stdio, self.write))
-        
+
         await self.session.initialize()
-        
+
         # List available tools
         response = await self.session.list_tools()
         tools = response.tools
@@ -57,52 +54,37 @@ class MCPClient:
 
     async def process_query(self, query: str) -> str:
         """Process a query using Claude and available tools"""
-        messages = [
-            {
-                "role": "user",
-                "content": query
-            }
-        ]
+        messages = [{"role": "user", "content": query}]
 
         response = await self.session.list_tools()
-        available_tools = [{ 
-            "name": tool.name,
-            "description": tool.description,
-            "input_schema": tool.inputSchema
-        } for tool in response.tools]
+        available_tools = [
+            {"name": tool.name, "description": tool.description, "input_schema": tool.inputSchema}
+            for tool in response.tools
+        ]
 
         # Initial Claude API call
         response = self.anthropic.messages.create(
-            model=ANTHROPIC_MODEL,
-            max_tokens=1000,
-            messages=messages,
-            tools=available_tools
+            model=ANTHROPIC_MODEL, max_tokens=1000, messages=messages, tools=available_tools
         )
 
         # Process response and handle tool calls
         final_text = []
 
         for content in response.content:
-            if content.type == 'text':
+            if content.type == "text":
                 final_text.append(content.text)
-            elif content.type == 'tool_use':
+            elif content.type == "tool_use":
                 tool_name = content.name
                 tool_args = content.input
-                
+
                 # Execute tool call
                 result = await self.session.call_tool(tool_name, tool_args)
                 final_text.append(f"[Calling tool {tool_name} with args {tool_args}]")
 
                 # Continue conversation with tool results
-                if hasattr(content, 'text') and content.text:
-                    messages.append({
-                      "role": "assistant",
-                      "content": content.text
-                    })
-                messages.append({
-                    "role": "user", 
-                    "content": result.content
-                })
+                if hasattr(content, "text") and content.text:
+                    messages.append({"role": "assistant", "content": content.text})
+                messages.append({"role": "user", "content": result.content})
 
                 # Get next response from Claude
                 response = self.anthropic.messages.create(
@@ -119,29 +101,30 @@ class MCPClient:
         """Run an interactive chat loop"""
         print("\nMCP Client Started!")
         print("Type your queries or 'quit' to exit.")
-        
+
         while True:
             try:
                 query = input("\nQuery: ").strip()
-                
-                if query.lower() == 'quit':
+
+                if query.lower() == "quit":
                     break
-                    
+
                 response = await self.process_query(query)
                 print("\n" + response)
-                    
+
             except Exception as e:
                 print(f"\nError: {str(e)}")
-    
+
     async def cleanup(self):
         """Clean up resources"""
         await self.exit_stack.aclose()
 
+
 async def main():
     if len(sys.argv) < 2:
         print("Usage: python client.py <path_to_server_script>")
         sys.exit(1)
-        
+
     client = MCPClient()
     try:
         await client.connect_to_server(sys.argv[1])
@@ -149,6 +132,8 @@ async def main():
     finally:
         await client.cleanup()
 
+
 if __name__ == "__main__":
     import sys
+
     asyncio.run(main())