Early adopters of the package will note two changes made shortly before the release of the package to CRAN:
The configuration options .gander_fn and .gander_args have been
transitioned to one option, .gander_chat. That option takes an ellmer Chat, e.g.
options(.gander_chat = ellmer::chat_claude()).
If you've configured an ellmer model using the previous options, you'll get
an error that automatically translates to the new code you need to use.
There is no longer a default ellmer model. Early in the development
of gander, if you had an ANTHROPIC_API_KEY set up, the addin would
"just work." While this was convenient for Claude users, it means that the
package spends money on the users behalf without any explicit opt-in.