Anthropic's API can be used to build an AI agent in plain Python without any orchestration framework, according to a tutorial that walks through the process. The article covers defining tools via schemas, implementing the request-execute-respond loop, capping iterations to prevent runaway tool calls, and adding persistent memory so agents retain context across turns. It notes Claude Sonnet 4.5 will be retired on November 30, 2026, and recommends replacing the model string after that date.
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