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Claude Agent SDK
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TaglineAnthropic's SDK for building your own agents on Claude.Anthropic's CLI agent. Opus-powered, operates on your repo directly.Run LLMs locally. One-line install, GUI optional.AI search done right. Cited answers, not chat theater.
CategoryAgentsCodingDev PlatformResearch
PricingAPI usage + SDK is freePart of Claude Pro/Max/Team plansFree + open sourceFree + $20/mo Pro
Best forDevelopers building custom agents for their own company/product.Developers who want an agent, not autocomplete. Large refactors, tests, docs.Devs wanting offline/local LLMs for privacy or experimentation.Replacing Google for any question where you want a cited answer in seconds.
Strengths
  • Production-grade agent primitives
  • Built on Claude (best reasoning)
  • Full control — build exactly what you need
  • Runs locally, edits your actual files
  • Strong on large codebases with 1M context
  • Great at multi-step tasks
  • Run Llama, Mistral, Qwen, etc. on your laptop
  • Simple CLI + API
  • Hardware-aware (picks the right quant)
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
Weaknesses
  • Developer-only
  • You build the UI
  • Terminal-based — learning curve
  • Can't be used without Claude subscription
  • Needs beefy laptop for larger models
  • Speed way behind cloud APIs
  • Not a general chatbot
  • Answers can be shallow on complex topics
Kai's verdictS-tier for builders. The right primitives. What Kai is built on under the hood.S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.S-tier for local inference. If you care about privacy or want to tinker, install this today.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.
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