Claude Code Dev

OrganizationPopular

Leanmcp

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.

Overview

Publisher	Leanmcp
Repository	`gateway-skills`
Skill name	`claude-code-dev`
Stars	2.1K
Forks	2.1K
Bundled files	14
License	MIT
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
14 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by Leanmcp on GitHub. Read the source before you install it.

Installation

Install the Claude Code Dev AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/Leanmcp/gateway-skills/tree/main/claude-code-skills
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/Leanmcp/gateway-skills.git /tmp/gateway-skills
mkdir -p .claude/skills
cp -r /tmp/gateway-skills/claude-code-skills .claude/skills/claude-code-dev

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Claude Code Dev in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Claude Code Dev on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Claude Code Dev is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

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.

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

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Claude Code Dev AI skill do?

Why use Claude Code Dev on TypingMind?

Because you install it once and use it with any model. Claude Code Dev is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Claude Code Dev in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/Leanmcp/gateway-skills/tree/main/claude-code-skills. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Claude Code Dev?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Claude Code Dev?

As many as you like. As long as a model supports skills, you can use Claude Code Dev with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Claude Code Dev AI skill free?

Yes. It is published on GitHub by Leanmcp under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Claude Code Development Style Guide

Summary

Detailed Guides (Resource Files)

Bundled files

Frequently asked questions

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