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

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---
title: "Tools: Concepts"
description: "Tool selection strategy, safety boundaries, and reliability rules for agentic execution."
icon: "wrench"
mode: "wide"
---
## When to use tools
- Agents need external data or side effects.
- Deterministic systems must be integrated into agent workflows.
## Tool safety rules
- define clear input schemas
- validate outputs before downstream use
- isolate privileged tools behind policy checks
## Canonical links
- Reference: [/en/ai/tools/reference](/en/ai/tools/reference)
- Patterns: [/en/ai/tools/patterns](/en/ai/tools/patterns)
- Troubleshooting: [/en/ai/tools/troubleshooting](/en/ai/tools/troubleshooting)
- Examples: [/en/ai/tools/examples](/en/ai/tools/examples)
- Existing docs: [/en/concepts/tools](/en/concepts/tools)