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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is a reverse-engineered / decompiled version of Anthropic's official Claude Code CLI tool. The goal is to restore core functionality while trimming secondary capabilities. Many modules are stubbed or feature-flagged off. The codebase has ~1341 tsc errors from decompilation (mostly unknown/never/{} types) — these do not block Bun runtime execution.

Commands

# Install dependencies
bun install

# Dev mode (direct execution via Bun)
bun run dev
# equivalent to: bun run src/entrypoints/cli.tsx

# Pipe mode
echo "say hello" | bun run src/entrypoints/cli.tsx -p

# Build (outputs dist/cli.js, ~25MB)
bun run build

No test runner is configured. No linter is configured.

Architecture

Runtime & Build

  • Runtime: Bun (not Node.js). All imports, builds, and execution use Bun APIs.
  • Build: bun build src/entrypoints/cli.tsx --outdir dist --target bun — single-file bundle.
  • Module system: ESM ("type": "module"), TSX with react-jsx transform.
  • Monorepo: Bun workspaces — internal packages live in packages/ resolved via workspace:*.

Entry & Bootstrap

  1. src/entrypoints/cli.tsx — True entrypoint. Injects runtime polyfills at the top:
    • feature() always returns false (all feature flags disabled, skipping unimplemented branches).
    • globalThis.MACRO — simulates build-time macro injection (VERSION, BUILD_TIME, etc.).
    • BUILD_TARGET, BUILD_ENV, INTERFACE_TYPE globals.
  2. src/main.tsx — Commander.js CLI definition. Parses args, initializes services (auth, analytics, policy), then launches the REPL or runs in pipe mode.
  3. src/entrypoints/init.ts — One-time initialization (telemetry, config, trust dialog).

Core Loop

  • src/query.ts — The main API query function. Sends messages to Claude API, handles streaming responses, processes tool calls, and manages the conversation turn loop.
  • src/QueryEngine.ts — Higher-level orchestrator wrapping query(). Manages conversation state, compaction, file history snapshots, attribution, and turn-level bookkeeping. Used by the REPL screen.
  • src/screens/REPL.tsx — The interactive REPL screen (React/Ink component). Handles user input, message display, tool permission prompts, and keyboard shortcuts.

API Layer

  • src/services/api/claude.ts — Core API client. Builds request params (system prompt, messages, tools, betas), calls the Anthropic SDK streaming endpoint, and processes BetaRawMessageStreamEvent events.
  • Supports multiple providers: Anthropic direct, AWS Bedrock, Google Vertex, Azure.
  • Provider selection in src/utils/model/providers.ts.

Tool System

  • src/Tool.ts — Tool interface definition (Tool type) and utilities (findToolByName, toolMatchesName).
  • src/tools.ts — Tool registry. Assembles the tool list; some tools are conditionally loaded via feature() flags or process.env.USER_TYPE.
  • src/tools/<ToolName>/ — Each tool in its own directory (e.g., BashTool, FileEditTool, GrepTool, AgentTool).
  • Tools define: name, description, inputSchema (JSON Schema), call() (execution), and optionally a React component for rendering results.

UI Layer (Ink)

  • src/ink.ts — Ink render wrapper with ThemeProvider injection.
  • src/ink/ — Custom Ink framework (forked/internal): custom reconciler, hooks (useInput, useTerminalSize, useSearchHighlight), virtual list rendering.
  • src/components/ — React components rendered in terminal via Ink. Key ones:
    • App.tsx — Root provider (AppState, Stats, FpsMetrics).
    • Messages.tsx / MessageRow.tsx — Conversation message rendering.
    • PromptInput/ — User input handling.
    • permissions/ — Tool permission approval UI.
  • Components use React Compiler runtime (react/compiler-runtime) — decompiled output has _c() memoization calls throughout.

State Management

  • src/state/AppState.tsx — Central app state type and context provider. Contains messages, tools, permissions, MCP connections, etc.
  • src/state/store.ts — Zustand-style store for AppState.
  • src/bootstrap/state.ts — Module-level singletons for session-global state (session ID, CWD, project root, token counts).

Context & System Prompt

  • src/context.ts — Builds system/user context for the API call (git status, date, CLAUDE.md contents, memory files).
  • src/utils/claudemd.ts — Discovers and loads CLAUDE.md files from project hierarchy.

Feature Flag System

All feature('FLAG_NAME') calls come from bun:bundle (a build-time API). In this decompiled version, feature() is polyfilled to always return false in cli.tsx. This means all Anthropic-internal features (COORDINATOR_MODE, KAIROS, PROACTIVE, etc.) are disabled.

Stubbed/Deleted Modules

Module Status
Computer Use (@ant/*) Stub packages in packages/@ant/
*-napi packages (audio, image, url, modifiers) Stubs in packages/ (except color-diff-napi which is fully implemented)
Analytics / GrowthBook / Sentry Empty implementations
Magic Docs / Voice Mode / LSP Server Removed
Plugins / Marketplace Removed
MCP OAuth Simplified

Key Type Files

  • src/types/global.d.ts — Declares MACRO, BUILD_TARGET, BUILD_ENV and internal Anthropic-only identifiers.
  • src/types/internal-modules.d.ts — Type declarations for bun:bundle, bun:ffi, @anthropic-ai/mcpb.
  • src/types/message.ts — Message type hierarchy (UserMessage, AssistantMessage, SystemMessage, etc.).
  • src/types/permissions.ts — Permission mode and result types.

Working with This Codebase

  • Don't try to fix all tsc errors — they're from decompilation and don't affect runtime.
  • feature() is always false — any code behind a feature flag is dead code in this build.
  • React Compiler output — Components have decompiled memoization boilerplate (const $ = _c(N)). This is normal.
  • bun:bundle import — In src/main.tsx and other files, import { feature } from 'bun:bundle' works at build time. At dev-time, the polyfill in cli.tsx provides it.
  • src/ path alias — tsconfig maps src/* to ./src/*. Imports like import { ... } from 'src/utils/...' are valid.