The selected design maps to Implement exponential-backoff retries with a circuit breaker and return a clear message to the user if all retries..., which is the highest-control path for this scenario rather than a prompt-only or single-service shortcut. For tool-using agents, the durable pattern is schema-bound function invocation with timeouts, typed outputs, retry policy, and traceable execution rather than free-form endpoint guessing. The evaluation target is the full agent workflow: planning quality, tool selection, intermediate state, latency, retries, user feedback, and final task completion. Instrumentation must expose where degradation starts so remediation can focus on prompts, tool schemas, retrieval, model parameters, or infrastructure rather than random retuning. The distractors are weaker because they lean on A: Retry requests with a consistent short delay after each failure and notify...; C: Return a standard fallback message on failures to maintain conversation flow and...; D: Schedule retries using a fixed delay for all failure types maintaining predictable..., which compromises traceability, resilience, scalability, or policy enforcement in production. The answer therefore fits NVIDIA's production-agent pattern: modular workflow design, measurable runtime behavior, GPU-aware serving where applicable, and controlled integration with enterprise systems.