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I built a coding agent from scratch to see what's inside

This story is from 2026-10-04. It is preserved in the archive; the latest stories are on the live feed.

I use coding agents every day, and for a while I couldn't explain what they actually do between my prompt and the edit to my file. So I built one. The answer turned out to be smaller than I expected. Claude Code, Cursor and Codex all run the same loop: send the conversation to a model, run the tool…

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  1. 2026-10-04 22:13 · DEV Community — AI
    I built a coding agent from scratch to see what's inside

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