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1111| If you're... | Use | Why |
1212| ------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- |
13| Building an agent without implementing the tool loop yourself | **Agent SDK** | A library that runs the agent loop in your own process, in Python or TypeScript. |
13| Building an agent without implementing the tool loop yourself | **Agent SDK** | A Python or TypeScript library that runs the agent loop for you. |
1414| Doing interactive development or running one-off tasks from a terminal | [**Claude Code CLI**](/docs/en/overview) | The terminal interface, built for daily interactive use. |
1515| Calling the API directly and implementing the tool loop yourself | [**Client SDK**](https://platform.claude.com/docs/en/api/client-sdks) | Direct access to the Anthropic API rather than to Claude Code. You implement the tool loop yourself. |
1616| Running long-running or asynchronous agents without managing your own sandbox or session infrastructure | [**Managed Agents**](https://platform.claude.com/docs/en/managed-agents/overview) | Hosted REST API, a separate product from the Agent SDK. Anthropic runs the agent and the sandbox. |