Extension SDK Updates: Purpose-Built Apps GA, fetch3, and More
· 4 min read
The first half of 2026 brought several meaningful updates to the Extension SDK: Purpose-Built Apps moved from early access to general availability, a new fetch3 API replaced fetch2 as the recommended way to make external requests, and the XM Solution plugin type gained support for a new Overview resource. Here's a rundown of what changed and what it means for your extensions.