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Rabbit Code CLI Cover

Rabbit Code CLI

We hacked Claude Code open-source, debugged it from scratch, and made it actually work.
_{macOS / Linux / Windows (WSL)}

The Story · Quick Start · What's Different · Features · License

The Story

Claude Code is arguably the best AI coding CLI in the world. But it's closed-source.

Then claude-code-best did the insane work of decompiling the entire thing — 43 tools, 100+ commands, 5000-line REPL, multi-provider API, MCP protocol, plugin system — all reverse-engineered from the compiled bundle.

We took that, and actually made it run.

It wasn't easy. The decompiled code was riddled with landmines:

API 500 errors — The prompt-caching-scope-2026-01-05 beta header sends cache_control.scope:"global" on system prompts. The server rejects this from non-official builds. We had to disable all experimental betas.
Empty streaming responses — Opus returns 200 headers but zero events, triggering a non-streaming fallback that sends thinking: {"type":"adaptive"} — which non-streaming doesn't support. We patched adjustParamsForNonStreaming to convert adaptive thinking to budget-based.
USER_TYPE: undefined — A build-time constant that was never set, causing User-Agent: (undefined, cli). We inject "external" at runtime.
Gates is not defined — A feature-flagged component referenced but never imported. Even wrapped in false ? ... : [], the assignment still evaluated and crashed.
Version mismatch — Attribution header checked cc_version, rejecting anything that didn't match the official release.

Every one of these was a dead end until we added file-based debug logging (/tmp/rabbit-code-debug.log) to capture the exact HTTP request/response cycle — because the TUI swallows all stderr output.

The moment it finally worked, we literally said "wow".

Now you can run the full Claude Code experience — with your own API key, your own OAuth, your own branding — completely open.

Quick Start

The fastest way to use Rabbit Code CLI is via npx:

npx rabbit-code-cli
# or shorthand
npx rabbit

Global Install

You can also install it globally via npm, pnpm, or bun:

# Using npm
npm install -g rabbit-code-cli

# Using pnpm
pnpm add -g rabbit-code-cli

# Using bun
bun add -g rabbit-code-cli

Usage

Once installed, you can start the CLI using either:

rabbit
# or
rabbit-code-cli

From Source

cd rabbit-code-cli
pnpm install
pnpm run build
bun run dev

That's it. You should see the RABBIT-CODE ASCII art logo and be ready to code.

Requires Node.js >= 18 (to run) and Bun >= 1.3.11 (to build from source), and an Anthropic API key or Claude Pro subscription.

What's Different

	Official Claude Code	Rabbit Code CLI
Source code	Closed	Open
Branding	Anthropic	Yours (or ours)
API compatibility	Official only	Any Anthropic-compatible endpoint
Experimental betas	All enabled	Stable subset only
Feature flags	Server-controlled	All `false` (clean, no dead code paths)
Customization	None	Full source access — hack everything

Key patches we made

fix: disable experimental betas (prompt-caching-scope, redact-thinking, context-management)
fix: set USER_TYPE="external" for correct User-Agent
fix: convert adaptive thinking → budget-based for non-streaming fallback
fix: remove Gates component reference crash
fix: match version for attribution header compatibility

Features

Everything from Claude Code, minus the feature-flagged internal stuff:

Interactive REPL — Rich Ink-based terminal UI, streaming responses, vim mode
Multi-provider — Anthropic Direct, AWS Bedrock, Google Vertex, Azure Foundry
43 Tools — File ops, bash, web search/fetch, glob/grep, agents, MCP, LSP
100+ Commands — /model, /compact, /doctor, /resume, /mcp, /plugin...
MCP Protocol — Full client with stdio, SSE, HTTP transports
Plugins & Skills — Extensible with custom commands and automation
Smart Context — Auto git status, CLAUDE.md, memory files, reactive compaction
Permissions — Granular plan/auto/manual tool permission modes
Hooks — Pre/post tool use hooks for custom workflows
Sessions — Resume, export, memory across conversations

Architecture

rabbit-code-cli/
├── src/
│   ├── entrypoints/cli.tsx    # Bootstrap + runtime polyfills
│   ├── screens/REPL.tsx       # 5000+ line interactive UI
│   ├── services/api/          # Multi-provider API (4 providers)
│   ├── services/mcp/          # MCP client (24 files, 12000+ lines)
│   ├── tools/                 # 43 tool implementations
│   ├── commands/              # 100+ slash commands
│   └── components/            # 146 Ink UI components
├── packages/                  # Internal workspace packages
├── build.ts                   # Code-splitting build (→ ~450 chunks)
└── rabbit-code-cli            # Launcher script

Contributing

Found a bug? Want to add a feature? PRs welcome.

This project exists because someone was crazy enough to decompile Claude Code, and we were crazy enough to debug it. If that resonates with you — star the repo, fork it, make it yours.

License

Apache-2.0