Bundle Mode
Calcit programs are primarily designed to be written using the calcit-editor, a structural editor.
You can also try short code snippets in eval mode:
calcit calcit.cirru eval '+ 1 2'
# => 3
If you prefer to write Calcit code without the calcit-editor, that's possible too. See the example in minimal-calcit.
For current source and migration guidance, use calcit docs read upgrade --full. The current Calcit workflow reads calcit.cirru directly; legacy bundle and compact-file commands are no longer part of the normal workflow.