Claude Agent SDK
S tierAnthropic's SDK for building your own agents on Claude.
Kai's verdict
S-tier for builders. The right primitives. What Kai is built on under the hood.
Strengths
- Production-grade agent primitives
- Built on Claude (best reasoning)
- Full control — build exactly what you need
Weaknesses
- Developer-only
- You build the UI
Best for
Developers building custom agents for their own company/product.
Pricing
API usage + SDK is free