Could not edit file in Kakoune by specifying client and server

Hi!

Here is excerpt from Kakoune docs:

if you need an actual explorer to interact with the editor, you can create a Kakoune script that will 
spawn the tool in question, which should in return send an "edit" command followed by the path 
of the file you selected to the current Kakoune session 
(e.g. echo "eval -client $kak_client edit /path/to/file" | kak -p $kak_session)

I'm trying to set Broot like this. Here is my verb:

{
        invocation: edit
        shortcut: e
        key: enter
        apply_to: text_file
        execution: "echo eval -client client0 edit {file} | kak -p vk"
        leave_broot: false
}

Unfortunately when I press Enter on a text-file just nothing happens (command is echoed, though):

If I run the same command manually form command line - everything works as expected, the file is successfully opened in specified Kakoune session:

What may be wrong here? Am I missing something? Thank you!