Recreated Claude Code's behavior in 280 lines of Python
The magic in AI coding assistants isn't the code -- it's the prompts. I studied the externally observable behavior of Claude Code and recreated it from scratch in Python with the exact same behaviors. It works with any model -- OpenAI, Gemini, Claude. What's surprising: 1. You can keep the core agent really simple, just 280 lines of Python. As long as it supports hooks, custom sub-agents and Model Context Protocol (MCP), then all the rest of the coding-assistant-specific behavior and tools can be factored out into a separate MCP server. 2. The magic is in the prompts (1200 lines of…
Recreated Claude Code's behavior in 280 lines of Python launched on September 4, 2025 with 5 votes and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
A mini AI agent CLI, similar to Claude Code and Gemini CLI - ljw1004/mini_agent
This is a minimal coding assistant with the same behavior as Claude Code. Minimal: just 280 loc for the agent, 400 loc for tools, 1200 lop for prompts. Intuitively it "runs an interactive coding agent": $ python3 -m venv venv $ source venv/bin/activate $ pip install -r requirements.txt $ export GEMINI_API_KEY=redacted $ ./mini_agent.py --model gemini/gemini-2.5-pro [MODEL: gemini/gemini-2.5-pro + gemini/gemini-2.5-flash] [IMPLICIT --mcp builtin] [TRANSCRIPT: /Users/ljw1004/.claude/projects/default/2025-09-01.jsonl] > Please analyze the files in my current directory and tell me what they do. >> <system-reminder># CLAUDE.md (project instructions) ...</system-reminder> >> <system-reminder>Your…from github.com
In the maker’s words, at launch
The magic in AI coding assistants isn't the code -- it's the prompts. I studied the externally observable behavior of Claude Code and recreated it from scratch in Python with the exact same behaviors. It works with any model -- OpenAI, Gemini, Claude. What's surprising: 1. You can keep the core agent really simple…
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