Is there any way we can deactivate Workflows, Validation Rules, Visual Workflows, Process Builder using ANT Migration Tool
1 Answer
Generally speaking, yes. In most cases it's as simple as changing the active attribute from true to false, but you'll want to read the Metadata API for specifics.
For example (inside Lead.object):
<validationRules>
<fullName>First_Name_Required</fullName>
<active>true</active>
<description>First Name Required</description>
<errorConditionFormula>ISBLANK(FirstName)</errorConditionFormula>
<errorMessage>This field is required.</errorMessage>
</validationRules>
Changing "true" to "false" will deactivate the rule. Just check the documentation for specifics.