Unified MCP Client

This module provides a unified interface for connecting to MCP servers using different transport protocols (stdio, sse, streamable-http, websocket). The client can automatically detect the transport type based on configuration.

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TransportType

class TransportType(str, Enum):

Supported transport types.

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ServerConfig

class ServerConfig(BaseModel):

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validate_config

def validate_config(self):

Validate that either command or url is provided.

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transport_type

def transport_type(self):

Automatically detect transport type based on configuration.

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MCPClient

class MCPClient:

Unified MCP client that automatically detects and connects to servers using the appropriate transport protocol.

This client provides a unified interface for connecting to Model Context Protocol (MCP) servers using different transport protocols including STDIO, HTTP/HTTPS, WebSocket, and Server-Sent Events (SSE). The client automatically detects the appropriate transport type based on the configuration provided.

The client should be used as an async context manager for automatic connectionmanagement.

Parameters:

  • config (Union[ServerConfig, Dict[str, Any]]): Server configuration as either a :obj:ServerConfig object or a dictionary that will be converted to a :obj:ServerConfig. The configuration determines the transport type and connection parameters.
  • client_info (Optional[types.Implementation], optional): Client implementation information to send to the server during initialization. (default: :obj:None)
  • timeout (Optional[float], optional): Timeout for waiting for messages from the server in seconds. (default: :obj:10.0)
  • strict (Optional[bool], optional): Strict mode for generating FunctionTool objects. (default: :obj:False)

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init

def __init__(
    self,
    config: Union[ServerConfig, Dict[str, Any]],
    client_info: Optional[types.Implementation] = None,
    timeout: Optional[float] = 10.0,
    strict: Optional[bool] = False
):

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transport_type

def transport_type(self):

Get the detected transport type.

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_simplify_connection_error

def _simplify_connection_error(self, error: Exception):

Convert complex MCP connection errors to simple, understandable messages.

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session

def session(self):

Get the current session if connected.

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is_connected

def is_connected(self):

Check if the client is currently connected.

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list_mcp_tools_sync

def list_mcp_tools_sync(self):

Returns:

ListToolsResult: Result containing available MCP tools.

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generate_function_from_mcp_tool

def generate_function_from_mcp_tool(self, mcp_tool: types.Tool):

Dynamically generates a Python callable function corresponding to a given MCP tool.

Parameters:

  • mcp_tool (types.Tool): The MCP tool definition received from the MCP server.

Returns:

Callable: A dynamically created async Python function that wraps the MCP tool.

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_build_tool_schema

def _build_tool_schema(self, mcp_tool: types.Tool):

Build tool schema for OpenAI function calling format.

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get_tools

def get_tools(self):

Returns:

List[FunctionTool]: A list of :obj:FunctionTool objects representing the available tools from the MCP server. Returns an empty list if the client is not connected.

Note: This method requires an active connection to the MCP server. If the client is not connected, an empty list will be returned.

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get_text_tools

def get_text_tools(self):

Returns:

str: Text description of tools

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call_tool_sync

def call_tool_sync(self, tool_name: str, arguments: Dict[str, Any]):

Synchronously call a tool by name with the provided arguments.

Parameters:

  • tool_name (str): The name of the tool to call.
  • arguments (Dict[str, Any]): A dictionary of arguments to pass to the tool.

Returns:

Any: The result returned by the tool execution.

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create_mcp_client

def create_mcp_client(config: Union[Dict[str, Any], ServerConfig], **kwargs: Any):

Create an MCP client from configuration.

Factory function that creates an :obj:MCPClient instance from various configuration formats. This is the recommended way to create MCP clients as it handles configuration validation and type conversion automatically.

Parameters:

  • config (Union[Dict[str, Any], ServerConfig]): Server configuration as either a dictionary or a :obj:ServerConfig object. If a dictionary is provided, it will be automatically converted to
  • a: obj:ServerConfig. **kwargs: Additional keyword arguments passed to the :obj:MCPClient constructor, such as :obj:client_info, :obj:timeout, and :obj:strict.

Returns:

MCPClient: A configured :obj:MCPClient instance ready for use as an async context manager.

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create_mcp_client_from_config_file

def create_mcp_client_from_config_file(config_path: Union[str, Path], server_name: str, **kwargs: Any):

Create an MCP client from a configuration file.

Parameters:

  • config_path (Union[str, Path]): Path to configuration file (JSON).
  • server_name (str): Name of the server in the config. **kwargs: Additional arguments passed to MCPClient constructor.

Returns:

MCPClient: MCPClient instance as an async context manager. Example config file: \{ "mcpServers": \{ "filesystem": \{ "command": "npx", "args": [ "-y", "@modelcontextprotocol/server-filesystem", "/path" ] \}, "remote-server": \{ "url": "https://api.example.com/mcp", "headers": \{"Authorization": "Bearer token"\} \} \} \}

Usage: .. code-block:: python

async with create_mcp_client_from_config_file( “config.json”, “filesystem” ) as client: tools = client.get_tools()