Function discover 

pub fn discover(
    list: &EndpointList,
    model: Option<&str>,
    timeout: Duration,
) -> DiscoveryResult

Probe every OpenAI-compatible endpoint in list for its served models and fold the results into a DiscoveryResult. model is the configured model id and is always unioned in, because it is dialable whether or not any endpoint answered the probe. Every failure mode is silent: a probe that 404s, cannot connect, or returns non-JSON contributes no models and leaves discovery false. It is never fatal and never counts as a failover-class error, so a probe must not be able to trip an endpoint’s circuit breaker.

Must not be called on the hot path or at startup — only when the served agentd://intelligence or live agentd://capabilities surface is actually read. It probes every endpoint on every call, so the caller must cache the result rather than re-running it per read.