Ruby Has No Official Claude Agent SDK — Here Are Three Workarounds

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Anthropic offers an official Ruby client SDK via the anthropic gem, but no Ruby equivalent of its Claude Agent SDK — the full agent loop harness available for Python and TypeScript. The confusion stems partly from naming, as Anthropic previously called it the Claude Code SDK, and partly from tutorials that treat the client and agent SDKs as the same product. Ruby developers can manually build an agent loop using the existing anthropic gem, which handles tool calls and multi-turn conversations with a configurable turn cap to prevent runaway billing. Alternatively, the gem's built-in tool_runner utility automates the loop for simpler use cases where mid-turn human approval is not needed. A community gem, claude-agent-sdk-ruby, mirrors the Python SDK's interface but works by shelling out to the claude CLI, introducing Node.js and CLI dependencies into any Ruby environment that uses it.

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