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claude-code

claude-code-dev

How to develop, modify, and extend the Claude Code codebase following its established programming style, patterns, and conventions. Use this skill whenever working on the claude-code source — adding tools, commands, utils, components, types, hooks, services, or fixing bugs. Also use when the user asks about claude-code architecture, coding standards, file organization, or wants to understand how the codebase works. This skill ensures all contributions match the existing codebase style exactly.

install
source · Clone the upstream repo
git clone https://github.com/chatgptprojects/clear-code
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/chatgptprojects/clear-code "$T" && mkdir -p ~/.claude/skills && cp -r "$T/claude-code-skills" ~/.claude/skills/chatgptprojects-clear-code-claude-code-dev && rm -rf "$T"
manifest: claude-code-skills/SKILL.md
source content

Claude Code Development Style Guide

This skill captures the programming style, patterns, and conventions used in the Claude Code codebase (

@anthropic-ai/claude-code
). Each topic below links to a dedicated deep-dive document with comprehensive examples and rules extracted from the actual source.

Summary

Claude Code is an ESM TypeScript Node.js CLI application using Ink (React for terminals) for its UI, esbuild for transpilation, and Bun internally for feature flags and dead code elimination. Key stack: TypeScript, Zod v4, lodash-es, React/Ink, esbuild.

Detailed Guides (Resource Files)

Each topic below is covered in depth in its own resource file within this skill's directory. Read the relevant file before working on that area of the codebase.

#TopicFileSummary
01Project Overview
01-project-overview.md
Tech stack, build system, runtime environment, key dependencies
02Directory Structure
02-directory-structure.md
Full 
src/
layout, file organization patterns, where things go
03Import Conventions
03-import-conventions.md
.js
extensions, 
import type
, lodash cherry-picks, feature flags, cycle breaking
04Naming Conventions
04-naming-conventions.md
camelCase/PascalCase/UPPER_SNAKE rules, file naming, safety names
05TypeScript Patterns
05-typescript-patterns.md
Branded types, discriminated unions, 
as const
, 
satisfies
, Zod schemas, generics
06Commenting Style
06-commenting-style.md
JSDoc, why-not-what philosophy, PR references, section headers, lint suppression
07Error Handling
07-error-handling.md
Custom error classes, utility functions, graceful degradation, catch conventions
08Function Patterns
08-function-patterns.md
buildTool()
factory, memoize, async generators, guard clauses, fire-and-forget
09Tool Architecture
09-tool-architecture.md
Tool directory structure, 
buildTool()
API, schemas, permissions, UI rendering
10Command Architecture
10-command-architecture.md
Command types, index.ts pattern, lazy loading, registration
11State Management
11-state-management.md
Module-level state, getter/setter, AppState threading, cleanup registry
12Testing Conventions
12-testing-conventions.md
Reset helpers, NODE_ENV guards, test-only exports, deterministic sorting
13Formatting Rules
13-formatting-rules.md
No semicolons, single quotes, trailing commas, indentation, expression style
14Quick References
14-quick-references.md
Step-by-step checklists for adding tools, commands, utils, and types