MCP Server

from typing import Dict, Any, Optional from enum import Enum class JSONRPCErrorCode(Enum): """Standard JSON-RPC 2.0 error codes""" PARSE_ERROR = -32700 INVALID_REQUEST = -32600 METHOD_NOT_FOUND = -32601 INVALID_PARAMS = -32602 INTERNAL_ERROR = -32603 SERVER_ERROR = -32000 class MCPError(Exception): """Base MCP protocol error""" def __init__(self, message: str, code: JSONRPCErrorCode = JSONRPCErrorCode.INTERNAL_ERROR, data: Optional[Dict[str, Any]] = None): self.message = message self.code = code self.data = data super().__init__(message) def to_dict(self) -> Dict[str, Any]: """Convert error to JSON-RPC error format""" error_dict = { "code": self.code.value, "message": self.message } if self.data: error_dict["data"] = self.data return error_dict class InvalidRequestError(MCPError): def __init__(self, message: str = "Invalid request"): super().__init__(message, JSONRPCErrorCode.INVALID_REQUEST) class MethodNotFoundError(MCPError): def __init__(self, method: str): super().__init__(f"Method '{method}' not found", JSONRPCErrorCode.METHOD_NOT_FOUND) class InvalidParamsError(MCPError): def __init__(self, message: str = "Invalid parameters"): super().__init__(message, JSONRPCErrorCode.INVALID_PARAMS) class ResourceNotFoundError(MCPError): def __init__(self, uri: str): super().__init__(f"Resource not found: {uri}", JSONRPCErrorCode.SERVER_ERROR) class ToolExecutionError(MCPError): def __init__(self, tool_name: str, error: str): super().__init__(f"Tool '{tool_name}' execution failed: {error}", JSONRPCErrorCode.SERVER_ERROR)