AI engineering glossary · Prompt context engineering
What is reAct prompting?
ReAct prompting (also called Reason and Act): A pattern in which the model alternates between written reasoning ('Thought'), an action such as a search or tool call ('Action'), and the result it gets back ('Observation'), repeating until it can answer. It is the basis of many agent loops.
ReAct prompting: an example
Thought: I need today's USD-INR rate. Action: search('USD to INR'). Observation: 83.2. Thought: now compute.
Related terms
More Prompt context engineering terms
- Reasoning effort
- Recency bias in prompts
- Refine summarisation
- Reflexion
- Repetition penalty
- Rephrase and Respond
- Role prompting
- Rolling summary
Where you learn it
ReAct prompting is part of the AI Engineering Program, which teaches it with notes, a hands-on lab and an exam. The first lesson is free.