Currently, Coder CLI completions can be installed usingcoder completion. Right now this supports all commands and flags, but not any arguments or flag values.

However, we can also supply a customCompletionHandler to thecoder ssh command that will populate the autocomplete suggestions with a list of all agents owned by the currently logged in user.

coder ssh supports lots of formats so these completions will need to decide on just one, such as<agent>.<workspace>.
However,<workspace> aliases should also be added to the list for single-agent workspaces, since most workspaces are single-agent.

e.g.

$ coder ssh<TAB>golang-devreactbackend.testingdb.testing

Related to#14986, where tab completion support forssh coder.<TAB> was removed with the introduction of the wildcard ssh config.