True while a probe is in flight.
Whether the credential works, or null before anything has been probed.
Why the last probe failed, as the probe itself described it, or null when there is nothing more specific to say than "invalid". Kept so a rate limit or a provider outage is not reported as a bad credential.
Models this credential can actually reach, from the provider's models API (or the local Ollama server). Replaces the curated suggestion list.
What the settings dialog knows about an LLM credential.