128 lines of Python. That's the entire core of a coding agent — the loop that powers tools like Claude Code and Cursor. I didn't believe it either, so I built one from scratch.

Source: [Dev.to](https://dev.to/osama_ghazal_96/the-core-of-a-coding-agent-is-128-lines-of-python-so-i-built-one-from-scratch-1og9)

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