ReAct
ReAct means Reason and Act. An agent acts, reads the result, and uses that fact for its next step. It is not React.
Another example
An agent tests a deployment idea, reads health output, updates the idea, checks one file, and stops before writing.
Main parts
- 01User intent and context
- 02Model or tool decision
- 03Grounded result and fallback
Use it when
Use it for multi-step work where each result changes the next choice.
Do not use it when
Do not expose private reasoning or let loops run without bounds. One-step tasks do not need it.
Name used in code
reason/plan → action → observation → update Before you ship
Check the model and prompt versions, source data, versioned evaluation set, and measures. Verify links to evidence, tool permissions, privacy, common failures, decline-to-answer and fallback behavior, human review, monitoring, cost, speed, and rollback.
Outcome: Use or evaluate ReAct to make AI behavior measurable and tied to evidence. User context: An agent tests a deployment idea, reads health output, updates the idea, checks one file, and stops before writing. AI method or concept: ReAct. Why it fits: Use it for multi-step work where each result changes the next choice. Do not use it when: Do not expose private reasoning or let loops run without bounds. One-step tasks do not need it. AI requirements: Define the input and source evidence. Set model and tool permissions. Use versioned evaluation data and measures. Define failure, decline-to-answer, privacy, speed, and cost limits. Operational safeguards: Keep a clear trace and hide sensitive log data. Show users a safe fallback. Mark steps that need human review. Define how to roll back the model or prompt. Acceptance criteria: Record baseline and target measures on a versioned evaluation set. Test edge cases and hostile inputs. Verify fallback, monitoring, permissions, and rollback. Evidence and limits (evidence boundary): No single official standard controls the whole term. Its meaning may change across teams, platforms, or frameworks. Unknowns to confirm: Target task, model and version, evaluation owner, source data, risk limit, tool permissions, and production fallback.
Check this request
Review the current use of ReAct. Definition: ReAct means Reason and Act. An agent acts, reads the result, and uses that fact for its next step. It is not React. Release checks: Check the model and prompt versions, source data, versioned evaluation set, and measures. Verify links to evidence, tool permissions, privacy, common failures, decline-to-answer and fallback behavior, human review, monitoring, cost, speed, and rollback. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.