:AIChat without running assistant

[Konfekt]

How about running :AIChat without running the assistant if there are non-blank lines following the bottom-most >>> user line, say by appending a bang ! to :AIChat, to paste additional lines below it?

[Konfekt]

Here's a function to reuse an aichat buffer.
What would be convenient is to know which one was last used.
Is that variable public?
Also ">>> AI chat" is set internally as s:scratch_buffer_name; it would be more future-proof if this string is made public.

let g:aichat_scratch_buffer_name = ">>> AI chat"

function! ReuseChatBuffer()
  if &filetype ==# 'aichat' | return | endif

  " reuse some window of filetype Aichat in this tab
  let buffer_list_window_tab = tabpagebuflist(tabpagenr())
  let buffer_list_window_tab = filter(buffer_list_window_tab, 'getbufvar(v:val, "&filetype") ==# "aichat"')
  if !empty(buffer_list_window_tab) | return win_gotoid(win_findbuf(buffer_list_window_tab[0])[0]) | endif

  " reuse some window of filetype Aichat in any tab
  let buffer_list_window = []
  for i in range(tabpagenr('$'))
    call extend(buffer_list_window, tabpagebuflist(i + 1))
  endfor
  let buffer_list_window = filter(buffer_list_window, 'getbufvar(v:val, "&filetype") ==# "aichat"')
  if !empty(buffer_list_window) | return win_gotoid(win_findbuf(buffer_list_window[0])[0]) | endif

  " reuse some buffer named >>> AIChat
  if bufnr(g:aichat_scratch_buffer_name) >= 0
    exe 'vertical belowright sbuffer' bufnr(g:scratch_buffer_name)
    return
  endif

  " reuse some buffer of filetype Aichat
  let buffer_list = map(getbufinfo(), 'v:val.bufnr')
  let buffer_list = filter(buffer_list, 'getbufvar(v:val, "&filetype") ==# "aichat"')
  if !empty(buffer_list)
    exe 'vertical belowright sbuffer' buffer_list[0]
    return
  endif
endfunction

[madox2]

I am quite confused what is this issue about.

How about running :AIChat without running the assistant

there is no concept of assistant, what do you mean by that?

if there are non-blank lines following the bottom-most >>> user line, say by appending a bang ! to :AIChat, to paste additional lines below it?

I don't get this too

Could you try to explain again?