The plan-and-execute pattern is an agent-architecture design in which a dedicated planner component produces a structured task plan that an executor component then realises step by step using tools. Formalising the strategy as a reusable pattern lets agent frameworks separate high-level reasoning from low-level tool invocation, enabling re-planning and observability. It is widely implemented through function-calling pipelines in LLM agent frameworks.
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- As a design pattern it standardises the split between a planner that emits an ordered, often typed plan and an executor that invokes tools per step, feeding results back for monitoring and conditional re-planning. Agent frameworks codify this as composable nodes or graphs, using structured function-calling to bind plan steps to concrete tool calls, which improves traceability and recovery on multi-step tasks.