I haven't seen any docs that make it easy to transition from "here's a usage example" to "use this functionality in your project".
I've seen "add foolib==1.2 to your clipboard" for easy installation, but could we do the same for code samples?
miniblog.
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https://extensions.gnome.org/extension/779/clipboard-indicator/ is a clipboard manager with a nice touch: you can see the current value in the UI!
Occasionally I think I've copied something when I haven't (or vice versa), so making the state visible seems really helpful.
The Shelf is a NeXTSTEP alternative to a clipboard, but more flexible and powerful: https://en.wikipedia.org/wiki/Shelf_(computing)
You can put a source file and destination directory on the shelf, enabling a cut-and-paste style operation. You can still refer back to them afterwards!
I've noticed that data small enough to fit in your clipboard rarely gets saved to an individual file.
You get collections of data, but it would be odd to save a single URL to a file.
The clipboard less persistent, but it's incredibly convenient.