Zen MCP Server

""" Custom exceptions for PAL MCP tools. These exceptions allow tools to signal protocol-level errors that should be surfaced to MCP clients using the `isError` flag on `CallToolResult`. Raising one of these exceptions ensures the low-level server adapter marks the result as an error while preserving the structured payload we pass through the exception message. """ class ToolExecutionError(RuntimeError): """Raised to indicate a tool-level failure that must set `isError=True`.""" def __init__(self, payload: str): """ Args: payload: Serialized error payload (typically JSON) to return to the client. """ super().__init__(payload) self.payload = payload