In a 4.19.0-0.nightly-2025-05-19-005500 cluster, try to run "toolbox" command on the node:

sh-5.1# toolbox 
Error: failed to get the current user's default shell

sh-5.1# rpm -qf /usr/bin/toolbox
toolbox-0.1.1-1.el9.x86_64

sh-5.1# rpm-ostree status
State: idle
Deployments:
* ostree-unverified-registry:quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:bb63b13cb9cd0b8c4398f17498f004aff2e7ad770f28c84dc532069ae3a76526
                   Digest: sha256:bb63b13cb9cd0b8c4398f17498f004aff2e7ad770f28c84dc532069ae3a76526
                  Version: 9.6.20250514-0 (2025-05-14T23:44:17Z)

Noticed that there's also a toolbox-0.1.2-1.rhaos4.19.el9.noarch shipped in the OCP-4.19 repo, so install this version of toolbox on the node and it works. 

sh-5.1# dnf install toolbox --transient
Updating Subscription Management repositories.
Unable to read consumer identity

This system is not registered with an entitlement server. You can use subscription-manager to register.

Last metadata expiration check: 0:00:14 ago on Thu May 22 02:32:26 2025.
Package toolbox-0.1.1-1.el9.x86_64 is already installed.
Dependencies resolved.
============================================================================================================================
 Package                Architecture          Version                              Repository                          Size
============================================================================================================================
Upgrading:
 toolbox                noarch                0.1.2-1.rhaos4.19.el9                ci-ocp19-rhel9-rpms                 16 k

...

  Verifying        : toolbox-0.1.2-1.rhaos4.19.el9.noarch                                                               1/2 
  Verifying        : toolbox-0.1.1-1.el9.x86_64                                                                         2/2 
Installed products updated.

Upgraded:
  toolbox-0.1.2-1.rhaos4.19.el9.noarch                                                                                      

Complete!
sh-5.1# which toolbox 
/usr/bin/toolbox
sh-5.1# rpm -qf /usr/bin/toolbox
toolbox-0.1.2-1.rhaos4.19.el9.noarch
sh-5.1# 
sh-5.1# toolbox 
Checking if there is a newer version of registry.redhat.io/rhel9/support-tools available...
Spawning a container 'toolbox-root' with image 'registry.redhat.io/rhel9/support-tools'
Detected RUN label in the container image. Using that as the default...
c33bb068673559a04ac2941756ed7f61c13ffd0246271206aeda9f6b0420d33d
toolbox-root
Container started successfully. To exit, type 'exit'.
[root@anliaz22-tgfqr-worker-westus-vrbnw /]# 



    

9.6.20250514-0
toolbox-0.1.1-1.el9.x86_64
    

Always
    

    1. Run "toolbox" command on the node