Which component is responsible for planning and sequencing tool calls in the agent loop?

• A. The User interface.
• B. The Tools registry.
• C. The Agent loop/Executor.
• D. A Data lake.

Answer: (C)

Planning and sequencing tool calls happens inside the agent loop, often realized as the executor. This part of the system is responsible for deciding what to do next, choosing which tool to invoke, and ordering those calls based on the current state and results from prior steps. It keeps the agent’s reasoning in motion by generating a plan, dispatching the appropriate tool calls, and then incorporating the responses to update the plan and move toward an answer.

The user interface is just the surface for input and output—it doesn’t decide which tools to call. The Tools registry is a catalog of what tools exist and how to use them, which the loop can consult, but it’s the loop that actually orchestrates when and in what order tool calls occur. A Data lake is a storage resource and has no role in planning or sequencing the agent’s actions.

So, the component that handles planning and sequencing within the agent's operation is the agent loop (executor), which orchestrates the tool-call workflow step by step.