Cleaning Up Workflow Logic with GitHub Actions' New case Function

Cleaning Up Workflow Logic with GitHub Actions' New case Function We run Open Source Friday , a weekly livestream featuring open source maintainers. When guests book a slot via GitHub issue, a workflow generates their welcome package: a personalized message (written by the Copilot SDK) and a promotional thumbnail. The logic for deciding what to generate? Buried inside a Node script that ran every time, even when there was nothing to generate. GitHub shipped a new case function for Actions on January 29, 2026, and I used it to pull that decision into the workflow file where you can actually see it. What I was dealing with The thumbnail generation step ran every time. Inside the Node.js script, we had a check: if ( ! handle ) { console . log ( ' No GitHub handle available - skipping thumbnail generation ' ); process . exit ( 0 ); } It worked. But the decision logic was hidden inside the script. The step would show as completed (green checkmark) even when it didn't actually generate anyth