utcp-mcp 1.1.2

UTCP communication protocol plugin for interoperability with the Model Context Protocol (MCP).

UTCP MCP Plugin

Model Context Protocol (MCP) interoperability plugin for UTCP, enabling seamless integration with existing MCP servers.

Features

• MCP Server Integration: Connect to existing MCP servers
• Stdio Transport: Local process-based MCP servers
• HTTP Transport: Remote MCP server connections
• OAuth2 Authentication: Secure authentication for HTTP servers
• Migration Support: Gradual migration from MCP to UTCP
• Tool Discovery: Automatic tool enumeration from MCP servers
• Session Management: Efficient connection handling

Installation

pip install utcp-mcp

Quick Start

from utcp.utcp_client import UtcpClient

# Connect to MCP server
client = await UtcpClient.create(config={
    "manual_call_templates": [{
        "name": "mcp_server",
        "call_template_type": "mcp",
        "config": {
            "mcpServers": {
                "filesystem": {
                    "command": "node",
                    "args": ["mcp-server.js"]
                }
            }
        }
    }]
})

# Call MCP tool through UTCP
result = await client.call_tool("mcp_server.filesystem.read_file", {
    "path": "/data/file.txt"
})

Configuration Examples

Stdio Transport (Local Process)

{
  "name": "local_mcp",
  "call_template_type": "mcp",
  "config": {
    "mcpServers": {
      "filesystem": {
        "command": "python",
        "args": ["-m", "mcp_filesystem_server"],
        "env": {"LOG_LEVEL": "INFO"}
      }
    }
  }
}

HTTP Transport (Remote Server)

{
  "name": "remote_mcp",
  "call_template_type": "mcp",
  "config": {
    "mcpServers": {
      "api_server": {
        "transport": "http",
        "url": "https://mcp.example.com"
      }
    }
  }
}

With OAuth2 Authentication

{
  "name": "secure_mcp",
  "call_template_type": "mcp",
  "config": {
    "mcpServers": {
      "secure_server": {
        "transport": "http",
        "url": "https://mcp.example.com"
      }
    }
  },
  "auth": {
    "auth_type": "oauth2",
    "token_url": "https://auth.example.com/token",
    "client_id": "${CLIENT_ID}",
    "client_secret": "${CLIENT_SECRET}",
    "scope": "read:tools"
  }
}

Multiple MCP Servers

{
  "name": "multi_mcp",
  "call_template_type": "mcp",
  "config": {
    "mcpServers": {
      "filesystem": {
        "command": "python",
        "args": ["-m", "mcp_filesystem"]
      },
      "database": {
        "command": "node",
        "args": ["mcp-db-server.js"],
        "cwd": "/app/mcp-servers"
      }
    }
  }
}

Migration Scenarios

Gradual Migration from MCP to UTCP

Phase 1: MCP Integration

# Use existing MCP servers through UTCP
client = await UtcpClient.create(config={
    "manual_call_templates": [{
        "name": "legacy_mcp",
        "call_template_type": "mcp",
        "config": {"mcpServers": {"server": {...}}}
    }]
})

Phase 2: Mixed Environment

# Mix MCP and native UTCP tools
client = await UtcpClient.create(config={
    "manual_call_templates": [
        {
            "name": "legacy_mcp",
            "call_template_type": "mcp",
            "config": {"mcpServers": {"old_server": {...}}}
        },
        {
            "name": "new_api",
            "call_template_type": "http",
            "url": "https://api.example.com/utcp"
        }
    ]
})

Phase 3: Full UTCP

# Pure UTCP implementation
client = await UtcpClient.create(config={
    "manual_call_templates": [{
        "name": "native_utcp",
        "call_template_type": "http",
        "url": "https://api.example.com/utcp"
    }]
})

Debugging and Troubleshooting

Enable Debug Logging

import logging
logging.getLogger('utcp.mcp').setLevel(logging.DEBUG)

try:
    client = await UtcpClient.create(config=mcp_config)
    tools = await client.list_tools()
except TimeoutError:
    print("MCP server connection timed out")

List Available Tools

# Discover tools from MCP server
tools = await client.list_tools()
print(f"Available tools: {[tool.name for tool in tools]}")

Connection Testing

@pytest.mark.asyncio
async def test_mcp_integration():
    client = await UtcpClient.create(config={
        "manual_call_templates": [{
            "name": "test_mcp",
            "call_template_type": "mcp",
            "config": {
                "mcpServers": {
                    "test": {
                        "command": "python",
                        "args": ["-m", "test_mcp_server"]
                    }
                }
            }
        }]
    })
    
    tools = await client.list_tools()
    assert len(tools) > 0
    
    result = await client.call_tool("test_mcp.echo", {"message": "test"})
    assert result["message"] == "test"

Error Handling

from utcp.exceptions import ToolCallError

try:
    result = await client.call_tool("mcp_server.tool", {"arg": "value"})
except ToolCallError as e:
    print(f"MCP tool call failed: {e}")
    # Check if it's a connection issue, authentication error, etc.

Performance Considerations

• Session Reuse: MCP plugin reuses connections when possible
• Timeout Configuration: Set appropriate timeouts for MCP operations
• Resource Cleanup: Sessions are automatically cleaned up
• Concurrent Calls: Multiple tools can be called concurrently

Related Documentation

• Main UTCP Documentation
• Core Package Documentation
• HTTP Plugin
• CLI Plugin
• Text Plugin
• MCP Specification

Examples

For complete examples, see the UTCP examples repository.