TL;DR: Pieces doesn’t work without it!
Pieces OS is the background service that enables Pieces to work locally and handles communications with any integrations.
This means that without Pieces OS, Pieces for Developers will not be able to save your snippets or interact with any of your plugins.
Pieces OS also enables you to sync Pieces to the cloud so that you can access your data anywhere, and enables our other cloud-enabled features, like link sharing.
So, you should definitely download and install Pieces OS! Head over to https://code.pieces.app/install to get started.