A quick tour of using Model Only tools

There are seven geoprocessing tools that support advanced behavior in ModelBuilder. These tools are not for use from the tool dialog box or in scripting.

Model Only Tool	Description
Calculate Value	Calculate Value tool returns a value based on a specified Python expression.
Collect Values	The Collect Values tool is designed to collect output values of an iterator, or to convert a list of multivalues into a single input. The output of Collect Values can be used as input to tools like Merge, Append, Mosaic, and Cell Statistics.
Get Field Value	The Get Field Value tool gets the value of the first row of a table for the specified field.
Merge Branch	The Merge Branch tool merges two or more logical branches into a single output.
Parse Path	The Parse Path tool parses the input into its file, path, name, or extension. The output can be used as in-line variables in the output name of other tools.
Select Data	The Select Data tool selects data in a parent data element such as a folder, geodatabase, feature dataset, or coverage.
Stop	For the set of input values, iteration will stop if all the input values meet the specified conditon of either True or False. It is functionally similar to While iterator but is useful to stop a model if there is one While iterator in a model and no additional iterators can be added.

See examples of using Model Only tools in ModelBuilder.

Below is a list of Model Only tools and their inputs and outputs.

Model Only tool	Input	Output
Calculate Value	Expression, Code	Value
Collect Values	Any value	Single output multivalue
Get Field Value	Table	Value
Merge Branch	Any value	Value
Parse Path	Any value	String
Select Data	Data element, composite layer	String
Stop	Any value	Boolean