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It cannot work as is because parsing is not yet done when the description is generated.

You can split your talker_node in 2 nodes:

1 with condition=launch.conditions.IfCondition(launch.LaunchConfiguration("debug")) having the additional debug_prefix
1 with condition=launch.conditions.UnlessCondition(launch.LaunchConfiguration("debug")) having no additional prefix

This is equivalent to the <node if="$(arg debug) .../>" and <node unless="$(arg debug) .../>" existing with the XML syntax of launch files.

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