Planet Math (GitHub repo)
Trigger: !planetmath
Try it
Kagi would openhttps://github.com/search?l=TeX&q=org:planetmath+np+complete&type=Topics
Run @planetmath in Kagi for Kagi's own results from github.com only
URL pattern: https://github.com/search?l=TeX&q=org:planetmath+query&type=Topics
Searches github.com, filed under Academic (math/cs).