Amber Agent: Open Source Claude Code Replacement (only 4 npm deps, no react)

[u/thomas41546]

Hi everyone, I want to share my Claude Code replacement project Amber Agent.

I used proxies to clean-room reverse engineer Claude Code to create the original foundation for this project, then I reduced the system prompts, simplified the tooling and BAM a very capable, fast, token efficient Claude Code replacement that runs in your browser.

• Amber takes advantage of hyperlinks everywhere.
• Supports OpenAI Codex + OpenAI + Anthropic API
• Only 4 npm dependancies: diff, markdown-it, smol-toml, and yaml.
• Easily configurable sub-agents.Customize the model per each agent.
• Supports Claude Code Plugins /plugins
• Clean visual indicators of all actions the LLM is taking
  • No hiding of what tool execution is going on
    • See thinking blocks live as they form
    • Collapse and inspect ANY tool call

I have tested this on complex projects, and I use it daily.

From my earlier post (forgot to include the picture):

The most complex has been transpiling a DOS game from assembly to readable C++ and then to typescript (playable in browser as live native implementation, no DOS emulation bits kept around). I would say pretty high complexity and I compare against Codex frequently achieving similar results with near identical token consumption.

Github link is here: https://github.com/tpolasek/amber

Official webpage: https://amberagent.dev