Option B is the right call because it gives the platform team levers to tune behavior without rewriting the entire agent loop. A plugin registry with uniform invocation keeps tools addable without rewriting core agent logic. Hardcoded tool branches become unmaintainable fast. The runtime should therefore be built around a tool boundary where every API has declared inputs, declared outputs, validation, retry behavior, and instrumentation. The selected option specifically B states "Using a plugin-based system with uniform tool registration and invocation", which matches the operational requirement rather than a superficial wording match. The alternatives would look simpler in a prototype, but relying on the model to infer API behavior invites fabricated endpoints, malformed arguments, and brittle production behavior. Within the NVIDIA stack, NVIDIA's agent tooling favors explicit function specifications and observable execution paths instead of free-form API narration in the prompt. The answer is therefore about engineered control planes, not simply model capability. Schema validation, typed return objects, and trace IDs also make post-incident debugging realistic when a third-party dependency changes behavior.