| Name | Type | Description |
|---|---|---|
provider* | str | Provider name. |
Return the env var that supplies a provider's endpoint when none is stored.
Answers "what does leaving the /auth base-URL field blank fall back to?"
A blank save clears the plain endpoint env vars (so an inherited gateway
URL can't leak through — see apply_stored_credentials), so the only env
var that still supplies a value afterward is the DEEPAGENTS_CODE_-prefixed
one. The name is returned (not its value) for display next to the field, so
the user sees the knob rather than a long or sensitive URL.
Returns None when that variable holds no value — the endpoint then comes
from a config.toml literal or the provider SDK's own default, neither of
which is a single env var to name here.
