I've read Bitcoin Core 24 brings a miniscript visual programmer. Had a look, didn't find it.
Is that true?
How to check it out?
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No, there is no such feature included in Bitcoin Core.
What is included in Bitcoin Core v24.0rc1 is the ability to use miniscript in imported output script descriptors, with the restriction that it is watch only (signing support will likely be for 25.0).
There are other tools out there, developed independently, that let you design scripts using miniscript-based tooling. Including: