List the direct children of a directory resource on an MCP server (`resources/directory/read`). Parameters: - server (required): The name of the MCP server to read from - uri (required): The URI of the directory resource The listing is not recursive. Each entry carries its own `uri`; subdirectories appear with mimeType "${DIRECTORY_MIME_TYPE}" — call this tool again on a subdirectory's `uri` to descend. Only usable against a server that has declared support for directory listing; other servers return an error.