---
id: "anthropic-building-effective-agents"
title: "Building Effective AI Agents"
creator: "Anthropic"
creator_url: "https://www.anthropic.com/engineering/building-effective-agents"
url: "https://www.anthropic.com/engineering/building-effective-agents"
level: "intermediate"
level_max: null
category: "agents"
subcategory: "agent-design-patterns"
region: "West"
license: "closed"
license_scope: "linked-resource"
models: ["any"]
source_date: "2024-12-19"
date_added: "2026-10-18"
---

[Agents and harnesses](/agents/index.md)

# Building Effective AI Agents

by [Anthropic](https://www.anthropic.com/engineering/building-effective-agents)

[Read the original →](https://www.anthropic.com/engineering/building-effective-agents)

Workflows vs agents and the core patterns; argues to start simple. Readable without code.

Anthropic contrasts predefined workflows with systems that choose their next steps. This is a useful first read for deciding whether a simple arrangement is enough before adding autonomous behavior.

Level: [Intermediate](/levels/index.md#intermediate)
Models: any
Category: [Agents and harnesses](/agents/index.md)
Tags: [design-patterns](/tags/design-patterns/index.md)
Source date: 2024-12-19
Added: 2026-10-18
Last verified: 2026-10-18
Status: ok
Prerequisites: Assumes LLM calls and tools; workflow architecture is Intermediate in the supplied rubric.
Subcategory: [agent design patterns](/agents/agent-design-patterns/index.md)
Region: West
Original language: en
Access: free
Resource reuse: closed: No general open-reuse grant established from the inspected page. Closed is the conservative index bucket, not a legal finding; the resource is publicly readable. [Facet definitions](/about/index.md#facets)

Summary in our own words. Rights remain with the original creator. [Credit and correction policy](/about/index.md#credit-policy).

[Plain-text Markdown copy](/agents/agent-design-patterns/anthropic-building-effective-agents/index.md)