1. A system for providing a constraint manager user interface in an electronic design automation tool, comprising: a template instance generator to create a template instance of a template type in response to user selection of a template type, wherein the template type specifies a set of constraints and the template instance references the template type; wherein the template instance comprises association between the set of constraints and one or more different design objects and between the constraints and one or more constraint parameter values for the constraints; a design object selector to receive selection of a one or more design objects; a design object mapping component to associate the design object with the template instance; a template instance display component to display a template instance tree comprising a template instance node that represents the template instance and that comprises association between the constraints of the set of constraints and the selected one or more design objects and between constraints and constraint parameter values for the constraints; wherein the template instance display includes a parameter user interface for user input of one or more template instance parameter values for the template instance created using the template instance generator.