How to hide shell_command_before

Step 1: Provide a summary of your problem

I want to execute some commands (with the shell_command_before option of my tmuxp file) but without those commands being shown on my shell.

The best thing that I could do was to put a clear command as the last, but the screen still blinks with my commands for some seconds.

Step 2: Provide tmuxp details

• Python Version 3.8.0
• Tmux version 3.0a
• Tmuxp version 1.5.4

Step 3: Describe your environment

• Architecture: Arch
• OS version: Manjaro Architect

Step 4: Describe the problem:

Steps to reproduce:

Create the following tmuxp file:

session_name: sample
windows:
- window_name: main
  layout: tiled
  shell_command_before:
    - cd ~/
    - echo "ok"
    - clear

Them, load that tmuxp file

Observed Results:

You will notice that you can see, on the top, the commands on shell_command_before

Expected Results:

I would want to have a option that run those commands silently

Start by locating the implementation that processes the tmuxp file's shell_command_before entries, then trace how each command is sent to tmux. Reproduce the sample configuration and compare the current visible output with the requested silent behavior. Done means commands run without being displayed or causing the reported blink.