This is a surprisingly complete toolkit for something as specific as Slack GIFs. It gives you validators that actually check the 64KB emoji limit (which is genuinely strict), plus composable primitives like shake, bounce, explode, and morph that you can combine however you want. The primitives are well thought out with things like easing options, arc trajectories, and heartbeat pulses. What's useful is the clear distinction between message GIFs (2MB, more forgiving) and emoji GIFs (64KB, painful), plus specific strategies for hitting that tiny limit like using 32-48 colors and 10-15 frames max. If you've ever tried to manually optimize an animated emoji for Slack, you know how annoying the file size dance gets.
npx skills add https://github.com/composiohq/awesome-claude-skills --skill slack-gif-creator