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Building AI agents with Claude — Anthropic's engineering notes

Notes from Anthropic's official Claude talks on building real agents — straight from their engineers. Quotes are verbatim; sign in to read the full transcripts.

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Pick the right primitive: tool, skill, or subagent

We want to make sure that we're using the right agentic primitives at the right time. So when do you use a tool, when do you use a skill, and when do you use a subagent?

Tool, skill, or subagent? Decomposing an agent that outgrew its prompt · Claude (Anthropic)

Agents degrade as they outgrow their prompt

Your system prompt had grown to become several hundred lines long. You have dozens of tools and subagents… and because of the complexity, you've started to see regressions in the areas that your agent was previously accelerating in.

Tool, skill, or subagent? Decomposing an agent that outgrew its prompt · Claude (Anthropic)

Don't just bolt on capabilities — modernize the architecture

We've essentially bolted capabilities onto our agent over time without modernizing our architecture. This complexity has started to cause some problems.

Tool, skill, or subagent? Decomposing an agent that outgrew its prompt · Claude (Anthropic)

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FAQ

When should you use a tool vs. a skill vs. a subagent?

Anthropic's engineers frame it as choosing the right agentic primitive for the job — tools for actions, skills for reusable on-demand instructions, and subagents for isolated context — rather than piling everything into one orchestrator.

Why do AI agents get worse over time?

Because capabilities get bolted on without modernizing the architecture: the system prompt balloons, tools and subagents multiply, and the agent starts to regress where it used to excel.

Where can I read these Anthropic agent talks?

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