HarnessesFramework

Claude Agent SDK

SDK that exposes Claude Code's agent loop and tools for building your own agents.

Maker
Anthropic
Kind
framework
Interface
SDK
Open source
Open source · Licence: MIT · GitHub
GitHub stars
8,293 (GitHub API, 2026-10-17)
Models
Anthropic Claude models
Pricing
—
MCP support
Yes
Subagents
Yes
Headless / scripted mode
—
Sandboxing
—
Note
Stars are for the Python SDK only. Usage is billed at Claude API rates (not listed here).
Official site
https://github.com/anthropics/claude-agent-sdk-python
Sources
api.github.com/repos/anthropics/claude-agent-sdk-python · code.claude.com/docs/en/agent-sdk/mcp · code.claude.com/docs/en/agent-sdk/subagents (docs checked 2026-10-17)
Other frameworks
OpenAI Agents SDK, smolagents, Mastra, LangGraph

Every value comes from the official site or docs, or from the GitHub API, on the date shown. A blank (—) means the value isn't stated or wasn't verified. It never means 'no'. Pricing is copied from official pages and changes often. No affiliate links.