Build agents with Claude
Anthropic's official SDK for agentic systems: the engine behind Claude Code, with tools, hooks and subagents.
Anthropic's SDK extracted from Claude Code: a production-hardened agent loop with file operations, code execution, subagents, hooks and MCP built in. The fastest way to build Claude-powered agents that behave like Claude Code behaves.
Who it's for
Developers building agents on Claude who want tool use, MCP and sub-agents handled out of the box.
Official links
Keep exploring
Concepts in the glossary
1 in catalog
Claude Agent SDK is written in
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Claude Agent SDK features
1 in catalog