Amber Agent: open-source Claude Code replacement with only 4 npm deps, runs in browser
thomas41546 · reddit · 2026-09-16
A developer open-sourced Amber Agent, a lightweight Claude Code replacement built by clean-room reverse engineering Claude Code via proxies, then slimming the system prompts and tooling into a fast, token-efficient coding agent that runs in the browser.
Key points:
- Only 4 npm dependencies (diff, markdown-it, smol-toml, yaml), no React
- Supports OpenAI Codex, OpenAI and Anthropic APIs, with per-subagent model customization
- Compatible with Claude Code plugins (/plugins)
- Fully transparent execution: live thinking blocks and inspectable tool calls
The author uses it daily; his hardest test was transpiling a DOS assembly game to C++ then TypeScript, running natively in the browser — results comparable to Codex with nearly identical token consumption. Repo: github.com/tpolasek/amber.
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