## ----provider_wraps, cache=FALSE, eval=FALSE----------------------------------
#  ollama <- llm_provider_ollama()
#  
#  # Example: add a "short answer" mode (provider-level post prompt wrap)
#  ollama$add_prompt_wrap(
#    provider_prompt_wrap(
#      modify_fn = \(txt) paste0(
#        txt,
#        "\n\nPlease answer concisely (< 2 sentences)."
#      )
#    ),
#    position = "post"
#  )
#  
#  # Use as usual: wraps are applied automatically
#  "What's a vignette in R?" |> send_prompt(ollama)