Defining custom adapters and switching models

[petobens]

Suppose I want to switch between gpt-4o and o3-mini models. In my config I then define the following:

local OPENAI_API_KEY = 'cmd:pass show openai/yahoomail/apikey'

codecompanion.setup({
    adapters = {
        openai_gpt_4o = function()
            return adapters.extend('openai', {
                env = { api_key = OPENAI_API_KEY },
                schema = {
                    model = { default = 'gpt-4o' },
                    max_tokens = { default = 2048 },
                    temperature = { default = 0.2 },
                    top_p = { default = 0.1 },
                },
            })
        end,
        openai_o3_mini = function()
            return adapters.extend('openai', {
                env = { api_key = OPENAI_API_KEY },
                schema = {
                    model = { default = 'o3-mini-2025-01-31' },
                },
            })
        end,
    },

As in the GIF I can the open the chat but encounter 3 questions/issues:

1. Run the change_adapter mapping and select the openai_o3_mini adapter by pressing 11. First question here: why does that list show every available adapter rather than those defined in my config? i.e I don't have an API key for anthropic so I would expect not to see the adapter here. Is it possible to display only defined adapters?
2. I understand that I can switch adapters but in this use case I want to switch between models, can that be achieved without prompting first for an adapter and then again for a model?
3. If I use :CodeCompanionChat <tab> I don't see my custom adapters being displayed in the completion and instead every single stock adapter is displayed. As in 1. I would expect only to have my defined/available adapters.

Thanks in advance for any pointers!

[olimorris]

why does that list show every available adapter rather than those defined in my config?

Because it displays all of the adapters in the config.lua file alongside your custom ones

I understand that I can switch adapters but in this use case I want to switch between models, can that be achieved without prompting first for an adapter and then again for a model?

You could create your own Lua function that calls creates a custom chat buffer, passing in the model as part of the adapter table. This isn't documented so you'll need to dig around the source code to work out how to do that (or use the /fetch slash command to make it faster)

I don't see my custom adapters being displayed in the completion and instead every single stock adapter is displayed

Good spot. This shouldn't be the case. A recent refactor removed that functionality. I'll put it back in my next PR.

[petobens]

Because it displays all of the adapters in the config.lua file alongside your custom ones

Is it possible to add an option to only display the custom/defined ones? Also I noticed that there is no picker (telescope, mini, etc) integration for selecting the adapter. Is that something you might add?

you'll need to dig around the source code to work out how to do that (or use the /fetch slash command to make it faster)
Thanks! I'll check that out.

[olimorris]

If you'd like those features, you'll need to PR them yourself.

[petobens]

Roger that. I'll look into it by using as a starting point your PR that fixes custom adapters not being shown in completions. Thanks