ReAct Basics: Let Tool Feedback Guide the Next Step

After acting, examine the feedback

ReAct combines reasoning and action: choose the next operation, call a tool, then adjust subsequent actions according to the result. What matters is not having many steps, but using new evidence at each step.

A successful search is not a solved problem

When looking for documentation, you can narrow the keywords if the first search finds nothing. After finding a candidate document, you still need to check its title and contents. A successful search does not by itself mean the problem has been solved.

Tools return evidence, not conclusions that are automatically true.

Set boundaries for the loop

Before connecting to real services, examine three design questions:

• How will invalid parameters be reported?
• When should the loop stop if it keeps receiving the same results?
• How will unresolved issues be explained when the step limit is reached?

These questions affect not only efficiency, but also whether a failure can produce honest, understandable feedback.

Practice with mock tools

You can rehearse with fixed, simulated tool responses before connecting to real services. Try three cases—“no results,” “repeated content,” and “relevant material found”—and record whether each case calls for continuing or stopping.

This article is a conceptual learning example and reports no execution results.