BoardSurfers: Getting Started with SKILL in Allegro X: Testing SKILL Scripts

23 Sep 2026 • 5 minute read

SKILL programming is one of the most powerful ways to extend and automate workflows in Allegro X PCB Editor. Whether you are experimenting with a new automation idea, testing a utility, or validating a newly developed script, knowing how to quickly load and run SKILL files can significantly improve your productivity.

In many environments, SKILL scripts are automatically loaded using the allegro.ilinit file. However, during development, debugging, or testing, manually loading SKILL scripts provides greater flexibility and faster iteration.

This blog focuses on how to run SKILL files without using the allegro.ilinit file, giving you flexible and immediate control over your scripting workflow. You will learn several methods, such as loading SKILL files, extending the SKILL search path, and identifying the command to run a SKILL script in the PCB Editor.

Why Load SKILL Scripts Manually?

Manual loading is particularly useful when:

Testing a newly developed SKILL script.
Validating script behavior before adding it to your initialization file.
Working with temporary or session-based utilities.
Debugging and refining automation scripts.

This approach lets you experiment quickly without modifying your standard environment.

Method 1: Load a SKILL File from the Working Directory

The simplest approach is to place the SKILL file in the same directory as your board file.

Copy the SKILL file into your working directory.
The following image shows an example directory containing a sample board and a SKILL file 251_Constraint_Flow.brd and nopinnets.il.
Launch Allegro X PCB Editor.
Load the SKILL file.
Enter the skill load("nopinnets.il") command in the Command window.

If the script loads successfully, the command line displays t as the final entry.

Method 2: Load a SKILL File Using a Full Path

If the SKILL file is stored outside the working directory, specify its complete path directly.

skill load("C:/work/skill/nopinnets.il")

This method is especially useful for centralized SKILL repositories and shared utility locations.

Method 3: Add a Custom SKILL Path

If you frequently use SKILL files from the same directory, you can add that location to the SKILL search path using the setSkillPath command. This command appends the specified directory to the existing SKILL path. Once added, SKILL files in that directory can be loaded without entering the full path each time.

For example, if you save your SKILL files in C:/work/skill directory, you can use the following command:

setSkillPath(buildString(append1(getSkillPath() "C:/work/skill")))

This approach is ideal when repeatedly testing or developing multiple SKILL utilities.

How to Identify the Command Used by a SKILL File

After loading a SKILL file, you need to know which command to enter in the PCB Editor command window to execute the utility.

A simple way to identify the command is to open the SKILL file in an ASCII text editor and review the developer comments.

Developers often include:

Single-line comments using semicolon (;)
Block comments using /* */

Another useful technique is to locate the axlCmdRegister function, which registers the command name associated with a SKILL script.
For example:

nopinnets is the command entered in PCB Editor.
ashNetsWithNoPins is the SKILL function being executed.

Conclusion

Manually loading SKILL scripts in Allegro X PCB Editor gives you a fast and flexible way to test, debug, and validate automation scripts without modifying your standard startup configuration. Once a script is fully tested, you can add it to the allegro.ilinit file for automatic loading and long-term use.

As you explore further, SKILL becomes a powerful tool that helps you automate repetitive tasks and focus more on design work, making your overall workflow faster and more efficient.

To learn in detail about this course, enroll in the course Allegro X PCB Editor SKILL Programming Language Training on the Cadence ASK portal. Click the Training Bytes link or visit Cadence ASK and search for Free Online Training Bytes (Videos) under the video library.

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If you want structured learning, pair the Training Bytes with Accelerated Learning, where you can test out of what you already know and focus only on areas that need attention—saving even more time.

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