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Developer builds core coding agent in 128 lines of Python

A developer has created a simplified, open-source coding agent from scratch using just 128 lines of Python code. This agent demonstrates the core functionality of more complex tools like Claude Code and Cursor, autonomously reading files, running tests, and fixing code based on observed errors. The agent's intelligence stems from the LLM, with the Python code providing the necessary plumbing and orchestration for tool execution. AI

IMPACT Provides a foundational understanding of how coding agents operate, potentially enabling simpler implementations.

RANK_REASON Developer built a simplified coding agent from scratch, demonstrating core functionality.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Developer builds core coding agent in 128 lines of Python

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Osama Ghazal ·

    The Core of a Coding Agent Is 128 Lines of Python. So I Built One From Scratch.

    <p><strong>128 lines of Python.</strong></p> <p>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. Then I pointed it at a failing test, and it read the file, ran the test, saw…