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# -*- coding: utf-8 -*-
"""
MCP Client - Connects to Gradio MCP servers on Hugging Face Spaces
Provides context/skills from MCP to enhance Gemini responses
"""
from gradio_client import Client
from typing import Optional, Dict, Any, List
import json
class MCPClient:
"""
Client for connecting to MCP (Model Context Protocol) servers
hosted on Hugging Face Spaces using Gradio.
MCP provides CONTEXT and SKILLS that ground Gemini's responses,
not a replacement for the LLM.
"""
def __init__(self):
self.client: Optional[Client] = None
self.space_url: str = ""
self.connected: bool = False
self.api_info: Dict[str, Any] = {}
self.available_endpoints: List[Dict[str, Any]] = []
self.space_name: str = ""
self.mcp_description: str = ""
self.mcp_capabilities: List[str] = []
def connect(self, space_url: str) -> Dict[str, Any]:
"""
Connect to a Gradio MCP server on Hugging Face Spaces.
Args:
space_url: URL to the HF Space (e.g., "MCP-1st-Birthday/QuantumArchitect-MCP")
Returns:
Dict with connection status and info
"""
try:
# Clean up the URL - extract space name if full URL provided
if "huggingface.co/spaces/" in space_url:
# Extract space name from full URL
parts = space_url.split("huggingface.co/spaces/")
if len(parts) > 1:
space_url = parts[1].rstrip("/")
# Remove any trailing slashes or extra parts
space_url = space_url.split("?")[0].rstrip("/")
self.space_url = space_url
self.space_name = space_url.split("/")[-1] if "/" in space_url else space_url
print(f"🔌 Connecting to MCP: {space_url}")
# Create Gradio client
self.client = Client(space_url)
self.connected = True
# Get API info and parse capabilities
try:
api_str = self.client.view_api(print_info=False, return_format="str")
if api_str:
self.api_info = {"raw": str(api_str)[:2000]}
# Parse endpoints from API info
self._parse_mcp_capabilities(str(api_str))
except Exception as e:
self.api_info = {"note": f"Could not retrieve API info: {str(e)}"}
return {
"success": True,
"message": f"✅ Connected to {self.space_name}",
"space_url": space_url,
"capabilities": self.mcp_capabilities,
"description": self.mcp_description
}
except Exception as e:
self.connected = False
self.client = None
error_msg = str(e)
print(f"❌ MCP connection failed: {error_msg}")
return {
"success": False,
"message": f"❌ Failed to connect: {error_msg}",
"space_url": space_url
}
def _parse_mcp_capabilities(self, api_str: str):
"""Parse MCP capabilities from API info string"""
self.mcp_capabilities = []
self.available_endpoints = []
# Extract endpoint names and descriptions
lines = api_str.split('\n')
current_endpoint = None
for line in lines:
# Look for endpoint definitions like "- predict(..., api_name="/handler")"
if 'api_name="/' in line or "api_name='/" in line:
# Extract endpoint name
if 'api_name="/' in line:
start = line.find('api_name="/') + len('api_name="')
end = line.find('"', start)
else:
start = line.find("api_name='/") + len("api_name='")
end = line.find("'", start)
if start > 0 and end > start:
endpoint_name = line[start:end]
self.available_endpoints.append({"name": endpoint_name, "line": line.strip()})
# Create capability description
capability = f"Endpoint: {endpoint_name}"
self.mcp_capabilities.append(capability)
# Generate description from space name
self.mcp_description = f"MCP Server: {self.space_name} with {len(self.available_endpoints)} endpoints"
def disconnect(self):
"""Disconnect from the MCP server"""
self.client = None
self.connected = False
self.space_url = ""
self.space_name = ""
self.api_info = {}
self.available_endpoints = []
self.mcp_description = ""
self.mcp_capabilities = []
return {"success": True, "message": "Disconnected from MCP"}
def get_context_for_llm(self, user_message: str) -> str:
"""
Get MCP context to ground the LLM response.
This queries relevant MCP endpoints and returns context for Gemini.
Args:
user_message: The user's message to find relevant context for
Returns:
Context string to prepend to Gemini's system prompt
"""
if not self.connected or not self.client:
return ""
context_parts = []
# Add MCP description
context_parts.append(f"You have access to the {self.space_name} MCP server.")
# Try to get relevant information from MCP
try:
# Try calling the MCP to get context
mcp_response = self._query_mcp_for_context(user_message)
if mcp_response and not mcp_response.startswith("❌"):
context_parts.append(f"\n**MCP Context ({self.space_name}):**\n{mcp_response}")
except Exception as e:
context_parts.append(f"\nMCP available but query failed: {str(e)[:100]}")
# Add available capabilities
if self.mcp_capabilities:
caps = ", ".join(self.mcp_capabilities[:5])
context_parts.append(f"\nAvailable MCP capabilities: {caps}")
return "\n".join(context_parts)
def _query_mcp_for_context(self, message: str) -> str:
"""Query the MCP to get relevant context for the message"""
if not self.client:
return ""
# Try common context/info endpoints first
context_endpoints = [
"/get_context",
"/info",
"/describe",
"/capabilities",
"/handler",
]
for ep in context_endpoints:
try:
result = self.client.predict(message, api_name=ep)
if result is not None:
formatted = self._format_result(result)
if formatted and len(formatted) > 10 and not formatted.startswith("❌"):
# Truncate if too long
if len(formatted) > 500:
formatted = formatted[:500] + "..."
return formatted
except Exception:
continue
return ""
def call_mcp(self, message: str, endpoint: str = "") -> str:
"""
Call the MCP server with a message.
Args:
message: The user's message to send to the MCP
endpoint: The API endpoint to call (e.g., "/handler" or index like "0")
Returns:
Response from the MCP server
"""
if not self.connected or not self.client:
return "❌ Not connected to any MCP server. Please connect first."
try:
# Try to find the best endpoint
api_name = endpoint if endpoint else None
# Common MCP handler endpoints to try
endpoints_to_try = [
"/handler", # Most common for MCP
"/chat",
"/predict",
"/run",
"/call",
"/process",
0, # First endpoint by index
]
if api_name:
endpoints_to_try.insert(0, api_name)
last_error = ""
for ep in endpoints_to_try:
try:
# Try calling with different parameter styles
if isinstance(ep, int):
result = self.client.predict(message, fn_index=ep)
else:
# Try with just message
try:
result = self.client.predict(message, api_name=ep)
except Exception:
# Try with message as first param
result = self.client.predict(
message, # As the main input
api_name=ep
)
if result is not None:
formatted = self._format_result(result)
if formatted and not formatted.startswith("❌"):
return formatted
except Exception as e:
last_error = str(e)
continue
# If nothing worked, return helpful message
return f"❌ Could not call MCP. Try specifying an endpoint.\nAvailable: {self.available_endpoints[:10]}...\nLast error: {last_error[:100]}"
except Exception as e:
return f"❌ Error calling MCP: {str(e)}"
def _format_result(self, result: Any) -> str:
"""Format the MCP result to a string"""
if isinstance(result, str):
return result
elif isinstance(result, dict):
return json.dumps(result, indent=2)
elif isinstance(result, (list, tuple)):
# If it's a tuple/list, try to extract the main content
if len(result) > 0:
main_result = result[0]
if isinstance(main_result, str):
return main_result
return json.dumps(main_result, indent=2)
return str(result)
else:
return str(result)
def get_status(self) -> Dict[str, Any]:
"""Get current connection status"""
return {
"connected": self.connected,
"space_url": self.space_url,
"space_name": self.space_name,
"endpoints": self.available_endpoints
}
def list_tools(self) -> str:
"""Try to list available tools/endpoints from the MCP"""
if not self.connected or not self.client:
return "Not connected to any MCP server."
try:
# Try to get API info
api_info = self.client.view_api(print_info=False, return_format="str")
return f"📋 Available API endpoints for {self.space_name}:\n\n{api_info}"
except Exception as e:
return f"Could not retrieve tools: {str(e)}"
# Singleton instance
mcp_client = MCPClient()
# Testing
if __name__ == "__main__":
print("=" * 50)
print("Testing MCP Client")
print("=" * 50)
client = MCPClient()
# Test connection
print("\n1. Testing connection to QuantumArchitect-MCP...")
result = client.connect("https://huggingface.co/spaces/MCP-1st-Birthday/QuantumArchitect-MCP")
print(f" Result: {result}")
if result["success"]:
print("\n2. Getting status...")
status = client.get_status()
print(f" Status: {status}")
print("\n3. Listing tools...")
tools = client.list_tools()
print(f" Tools: {tools[:500]}...")
print("\n4. Testing MCP call...")
response = client.call_mcp("Hello, what can you do?")
print(f" Response: {response[:200]}...")
print("\n5. Disconnecting...")
client.disconnect()
print(f" Connected: {client.connected}")
print("\n✅ MCP Client test complete!")
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