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Introduction to subagents

Introduction to subagents teaches how Claude Code delegates work to isolated assistants that run in their own context window and return only a summary, keeping your main conversation focused.

Open at Anthropic ↗Common questions

Who it suits

  • Claude Code users with long sessions where the main context fills up.
  • Anyone who wants code review or documentation handled by a delegated assistant.

What it covers

  • How subagents work: a separate context window, how inputs flow in and how summaries come back.
  • Creating custom subagents with the /agents command, for jobs such as code review and documentation.
  • Designing reliable subagents with structured output, obstacle reporting and limited tool access.
  • When subagents help most, and common anti-patterns.

Common questions about Introduction to subagents

What is a subagent?
An isolated assistant that does its work separately and returns just the information you need, per Anthropic’s course description.
How long is it?
Anthropic lists 4 lessons.
Why use one?
Anthropic says subagents keep your main context window clean and your conversations focused.

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Where this comes from

Written from Anthropic’s own pages, read on 2026-10-13. Content, prices and availability change, so the provider’s page is the source. We are not affiliated with Anthropic and this is not an endorsement.