This script will display the full ability list when you check AB <ability>, with the abilities you don't have shown in red.

Example here.

It will also display abilities for seafaring specialisations and the rank they're gained at, but only if you have at least one point in that specialisation. Check AB for the script to get your current ranks.

Seafaring example here.

When skills/abilities are changed, you'll need to either update the ability list variables manually or download an updated version of the script here (I'll usually have it updated within a day or two of any changes). If you want to update it yourself, the variables are in ABLists|AbilityLists, and the format is pretty obvious. Just copy and paste the new/changed ability from HELP <skill>, or rearrange the items in the list if the ability order is changed.

For class-specific abilities in shared skills, the abilities you don't have access to will simply show up as any other ability you don't have. For example, a priest with trans devotion will see Fervour and Damnation listed in red when checking AB DEVOTION. I haven't decided yet how I want to handle this, but for now you can simply delete the abilities from the variable if it bothers you.

Because AB lists don't follow a standardised format, the script may not work for all of them. It's only been tested with Blademaster, Jester, Priest, Serpent, Monk, Runewarden, and General skills. It should work fine with most other skills, but there are most likely a few exceptions. If you find any problems, let me know, either on the forums or through an IG message.