I wonder whether this is right, though. As far as I gather Zeus uses c-lightning-rest to communicate with CLN. And as far as I can see, the keysend there does not support descriptions.
I'll need to check deeper whether Zeus actually uses something else for sending keysends on CLN. But at first glance it doesn't look like it.

tsjk

Or at least look at its source code. Good hint.

You could use Zeus LN connected to your CLN to send keysend with message.

DarthCoin

lightning

I'd like to keysend with description - to send a message to another node.
It seems like while core lightning can decode keysends with a description field, it cannot straightforwardly send one.
So, my question is: Can I somehow hack around this by putting a keysend with description invoice together manually? A bash script for that would be awesome. The next best thing would be a plugin.