These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.02 s (backtrack: 0/20).

[ebuild  N     ] dev-libs/cJSON-1.7.19::gentoo  USE="-test" 348 KiB
[ebuild  N     ] net-libs/mbedtls-3.6.5:3/16.21.7::gentoo  USE="threads -doc -programs -static-libs -test" CPU_FLAGS_X86="sse2" 5242 KiB
[ebuild  N     ] net-libs/librist-0.2.11::gentoo  USE="-test -tools" 2687 KiB

Total: 3 packages (3 new), Size of downloads: 8276 KiB