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

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---
title: "Agents: Concepts"
description: "Agent role contracts, task boundaries, and decision criteria for robust agent behavior."
icon: "user"
mode: "wide"
---
## When to use
- You need specialized behavior with explicit role and goal.
- You need tool-enabled execution under constraints.
## When not to use
- Static transformations are enough without model reasoning.
- Task can be solved by deterministic code only.
## Core decisions
| Decision | Choose this when |
|---|---|
| Single agent | Narrow scope, low coordination needs |
| Multi-agent crew | Distinct expertise and review loops needed |
| Tool-enabled agent | Model needs external actions or data |
## Canonical links
- Reference: [/en/ai/agents/reference](/en/ai/agents/reference)
- Patterns: [/en/ai/agents/patterns](/en/ai/agents/patterns)
- Troubleshooting: [/en/ai/agents/troubleshooting](/en/ai/agents/troubleshooting)
- Examples: [/en/ai/agents/examples](/en/ai/agents/examples)
- Existing docs: [/en/concepts/agents](/en/concepts/agents)