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Developer explains AI tool calling using just 40 lines of plain JavaScript

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A developer has published a concise tutorial demonstrating how AI tool calling works using only 40 lines of vanilla JavaScript, with no external libraries required. The lesson, dated September 15, 2026, is part of a series hosted on the Buttercup platform. Tool calling is a key AI capability that allows language models to invoke external functions or APIs to complete tasks. The tutorial aims to demystify the concept by breaking it down into minimal, readable code. The post was shared on Hacker News, where it attracted early attention from the developer community.

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