How to persistently set the 'Response to' using gpel-menu or gptel-send for a specific buffer?

[DrChr]

I have a buffer that contains a table of data and I'd like to query an LLM about separate regions (lines) of the data.
I'd like the results show up elsewhere, e.g. in another buffer or the echo area.

Concrete example: The buffer is a table of books I'm interested in, listing title and author. I want the LLM to tell me a little about the selected the book, to decide if i want to read it.

I have managed to use gptel-menu to set an appropriate system message, with scope = buffer.
This system message persists between using gptel-send, so that works fine.

However, I can't figure out how to persist the setting for 'Response to'.
It seems to reset after each gptel-send :-(

Is this a bug, or me not understanding how to properly use the transient-menu?

[DrChr]

Note: A workaround is to define a macro that does:
M-x gptel-menu
e
RET

[DrChr]

Perhaps a bug:

When I try to have the response sent to a buffer, books-output, I get the error:
progn: Args out of range: 885, #<marker at 3 in books-output>

I'll report that as an issue.
Update: Bug report: #1018

[DrChr]

Seems like a case or RTFM according to this:
https://github.com/karthink/gptel?tab=readme-ov-file#i-want-the-transient-menu-options-to-be-saved-so-i-only-need-to-set-them-once

I'll test it out and update here once I've verified it works.

Update: The link above doesn't seem to work, look for a FAQ entry with the heading:
I want the transient menu options to be saved so I only need to set them once

Update 2: it works

[DrChr]

The discoverability for how to save the settings for >Response to are quite poor IMHO.
The screenshot below illustrates what I see, and I don't notice anything that helps me figure out that I can use C-x C-s to save the settings.

The second screenshot in the FAQ entry, shown below, illustrates a transient-menu where the section on 'Value commands' do list 'C-x C-s'. However, I don't see this in my Emacs.

[karthink]

The discoverability for how to save the settings for >Response to are quite
poor IMHO.

This setting is governed by Transient, you can set the variable transient-show-common-commands if you want to change the default.