ReAct, at learning depth

Learn in five minutes

• ReAct interleaves a written reason and an action.
• The paper is Yao and co-authors, 2022.
• The reason is not automatically true. It is text.
• The action still goes through your tool and your cap.
• You can store the reason in the trace so a reviewer can see it.

A reason that says 'the note contains a date' must be checked against the note. The sentence is not the check.

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Visual

Diagram SVGDiagram PNGDiagram HTML

Flow SVGFlow PNGFlow HTML

Reason, then act

1. Write a reason: the card has no due date.
2. Act: call the refuse tool.
3. Check the card.
4. If the reason was wrong, the trace shows the mismatch.

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Quiz

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Ecosystem

ReAct

A pattern that writes a reason and takes an action in turns.

Sisters: Workflows, State machines, Function calling.

The same loop can sit behind chat or a voice turn. The channel does not remove the cap.

MCP is one way to plug tools into that loop. It is the next track.

Config

• Write the goal in one sentence.
• Name the input and the allowed output.
• Save the trace next to the result.

Troubleshooting

• The answer looks fluent and is wrong. Check whether a source passage actually contains the claim.
• The loop never stops. Set a step cap and stop when the tool result repeats.

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