How do Mods enable richer and more powerful UI interfaces, while still being secure? 

Here are two JSON snippets from the Farcaster Frame Mod

Building Larry, FOSS via @frames, @framesfun /open-frames to help decentralized social win. a16z CSX23. farcasterchannels.com farcaster.id

we're building a secure JSON based language for expressing richer interfaces beyond an image with four buttons, in a way that makes it super easy for anyone to integrate into their app. 

Play full games, transact, ...

docs.modprotocol.org - the frames mod will be merged and docs update later today. feel free to DC me

Co-Founder 

Contact: https://alice.chain.box

So is there a full hello world tutorial? I want to learn this anyways, might as well do it with mod