Shell completion

Add the line for your shell to its startup file:

# bash: ~/.bashrc
eval "$(source-coop completions bash)"

# zsh: ~/.zshrc, after compinit
eval "$(source-coop completions zsh)"

# fish: ~/.config/fish/config.fish
source-coop completions fish | source

# elvish: ~/.config/elvish/rc.elv
eval (source-coop completions elvish | slurp)

# PowerShell: $PROFILE
source-coop completions powershell | Out-String | Invoke-Expression

TAB then completes commands, flags, flag values and record names:

source-coop product view my-org/<TAB> shows the products of my-org. Before the /, it shows the accounts that you are a member of.
source-coop service-account view my<TAB> shows full service account IDs, such as my-org--nightly-sync. It does not complete the ID of a new service account for create.

Shell completion: TAB lists products and service accounts from the API

How completion works:

It always matches the installed version. On each TAB, the script runs source-coop with SOURCE_COOP_COMPLETE set.
Names come from the API, as you. Completion uses your session's access token (or SOURCE_TOKEN) and never renews it. When the token has expired, only public products complete. The next command that you run renews it.
It reads the environment only. It uses SOURCE_API_URL and SOURCE_PROXY_URL. It ignores --api-url and --proxy-url on the command line.
It waits 2 seconds for the API. After that, it shows no names, and bash shows file names.
On macOS, the keychain can ask for your password. TAB waits up to one minute for you. Select Always Allow so that it does not ask again until you install a new build.