AI Engineering/Phase 14/Lesson 17

Claude Agent SDK: Subagents and Session Store

The Claude Agent SDK is the library form of the Claude Code harness. Built-in tools, subagents for context isolation, hooks, W3C trace propagation, session store parity. Claude Managed Agents is the hosted alternative for long-running async work.

Learn + Build 1.3 hr Python (stdlib)

Prerequisites: Phase 14 · 01 (Agent Loop), Phase 14 · 10 (Skill Libraries)

#Learning Objectives

Explain the difference between the Anthropic Client SDK (raw API) and the Claude Agent SDK (harness shape).
Describe subagents — parallelization and context isolation — and when to reach for them.
Name the Python SDK's session store surface (append, load, list_sessions, delete, list_subkeys) and the role of --session-mirror.
Implement a stdlib harness with built-in tools, subagent spawning with isolated context, lifecycle hooks, and a session store.

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The text and code of this lesson are based on AI Engineering from Scratch by Rohit Ghumare, MIT licensed.