bt-snoop is a standalone tool that monitors Bluetooth packets sent to & received by the local controller. It makes this data available through the fuchsia.bluetooth.snoop.Snoop capability.
There are two main ways to include the bt-snoop package in your build.
If complete Bluetooth functionality is required, include it via the core Bluetooth group. Also include the snoop core shard.
If only bt-snoop is required, include the package in your build. For example, if using fx set, add: --with //src/connectivity/bluetooth/tools/bt-snoop. Also include the snoop eager core shard so that the component starts on boot.