Infrastructure
Claude Agent SDK
The Agent SDK is a toolkit developers use to build your own AI helper on the same underlying machinery that runs Claude Code. What it hands them is the working loop, meaning think, use a tool, check the result, try again, which is the slow and fiddly part to build from scratch. Your developer still supplies the specific tools it can reach and the rules it has to follow.
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Member lesson
The definition and sources are public. The complete practical lesson is for members.