Template:Require substitution

{{require substitution}} – Prints an error unless substituted.

{{always substitute}} – For the doc of the above templates; prints a message asking for it be substituted.
{{never substitute}} – The reverse of {{always substitute}}. For the doc of templates which should not be substituted; prints a message asking for it not to be substituted.
{{may be substituted}} – For the doc of templates whose substitution is optional.
{{substitution}} – Allows free-fill description of whether the template should be substituted and under what conditions.

{{ifsubst}} – Forks if substituted or not.

{{issubst}} – Returns "yes" if substituted.

Module:Unsubst – Prevents substitution.

Module:Unsubst-infobox – Prevents substitution for infoboxes, cleans up parameters.

List of subst helper templates[kulemba source]