You need to allow in Security & Privacy on the General tab. Note that Periphery doesn't currently work with Xcode 11, though if you're feeling adventurous there's an Xcode 11 branch: https://github.com/peripheryapp/periphery/tree/xcode11

Is there any way to avoid having to approve it? Can you sign it with Developer ID or build it on the user’s machine or something to that effect? The current behavior is pretty user-hostile and hard to figure out how to proceed. (I ended up doing xattr -d com.apple.quarantine /usr/local/bin/periphery because I’m old-school like that 😁.)

Oh absolutely there's room for improvement here, I've just had very little time to devote to Periphery recently.

A more GUI approach is to find the executable:

which periphery

open that directory and Ctrl-Click (or right click) the executable and select Open. This will show you a warning prompt with an Open option which would whitelist it for future execution.

Since it may be symlinked (e.g. if installed via Homebrew) one quick way to open the finder into that directory is to run:

open $(dirname $(realpath $(which periphery)))

Give access to terminal to access unverified apps

Give access to terminal to access unverified apps

Terrible idea because it allows access for ALL unsigned apps which is not what I want. I'd prefer Zev's way by using xattr -d com.apple.quarantine /usr/local/bin/periphery on that particular binary.

Maybe I'm getting old too… 🤔😃