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crewAI/docs/en/ai/flows/patterns.mdx
2026-02-19 11:26:06 -08:00

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---
title: "Flows: Patterns"
description: "Production flow patterns: triage routing, flowstate chat history, and human-in-the-loop checkpoints."
icon: "diagram-project"
mode: "wide"
---
## Recommended patterns
1. Triage router flow
- Inputs: normalized request payload
- Output: deterministic route label + action
- Reference: [/en/concepts/flows](/en/concepts/flows)
2. Flowstate chat history
- Inputs: `session_id`, `last_user_message`
- Output: assistant reply + compact context state
- Reference: [/en/learn/flowstate-chat-history](/en/learn/flowstate-chat-history)
3. Human feedback gates
- Inputs: generated artifact + reviewer feedback
- Output: approved/rejected/revision path
- Reference: [/en/learn/human-feedback-in-flows](/en/learn/human-feedback-in-flows)
## Pattern requirements
- declare explicit input schema
- define expected output shape
- list failure modes and retries