Claude Code Source Recovery

In March 2026, Anthropic accidentally shipped a 57MB source map with the full TypeScript source of claude-code 2.1.88, and someone extracted all 700,000 lines before it got yanked. This skill helps you navigate that recovered codebase. It's genuinely useful if you want to see how a production CLI implements MCP protocol bindings, manages stdio transports to external servers, or renders complex terminal UIs with Ink and React hooks. The command loading system is especially interesting because it merges built-in commands, dynamically loaded skills, plugins, and MCP-exposed tools into a single dispatch layer. You can still grab the original package from Tencent's npm mirror cache if you want to poke around the bundled artifacts yourself.

skills.sh installs: 648
GitHub stars: 61
last updated: Jul 14, 2026

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Install

$ npx -y skills add aradotso/trending-skills --skill claude-code-source-recovery --agent claude-code

Installs into .claude/skills of the current project.

Files

Claude Code 2.1.88 Source Recovery

Skill by ara.so — Daily 2026 Skills collection.

What This Project Is

This repository contains the recovered TypeScript source code of @anthropic-ai/claude-code version 2.1.88. On 2026-03-31, Anthropic accidentally published a cli.js.map (57MB) source map to npm that contained the full sourcesContent of the bundled CLI. After extraction and reconstruction, the result is ~700,000 lines of TypeScript source code organized into a readable directory structure.

The project is useful for:

Studying production CLI architecture patterns (Ink/React in terminal)
Understanding how MCP (Model Context Protocol) is implemented in a real CLI
Learning how Claude Code manages sessions, commands, authentication, and tool execution

Repository Structure

SKILL.md on GitHub

Details

Repository: github.com/aradotso/trending-skills
First seen: May 16, 2026