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How to Build an AI Agent from Scratch (It's Just a While Loop)

A developer has published a walkthrough for building an AI agent from scratch in TypeScript using only a model API and a while loop, covering tool calling, parallel tool calls, and a bug that no existing framework can fix. The writeup argues that the core agent loop is simpler than the surrounding tooling suggests.

by read1 min views2 publishedOct 4, 2026
How to Build an AI Agent from Scratch (It's Just a While Loop)
Image: Dev.to

Build an AI agent from scratch in TypeScript with only a model API and a loop. Covers tool calling, parallel tool calls, and a bug no framework can fix.

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source & further reading
dev.to — original article My git changelog listed a feature and its own revert in the same release — commit history isn't release contents I Integrated 20+ AI Models. The Hard Part Wasn't the AI. Mastering AI Video Camera Motion: How to Direct Start & End Keyframes for Cinematic Shots
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