ReAct and planner-executor remain two of the most useful agent patterns
goyalshaliniuk · x · 2026-07-29
Two common agent architectures
The post compares two widely used patterns:
- ReAct (Reason + Act): think → act → observe → think → repeat
- Planner-Executor: a planning agent breaks tasks down, then an executor agent carries them out
It argues that:
- ReAct works well for research agents, coding assistants, tool use, and autonomous workflows
- Planner-Executor improves reliability in complex, multi-step enterprise tasks by separating planning from execution
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