5 Free Repos to Add to Your Claude Code Setup Before You Build

Here are five free repos to add to your Claude Code setup before you build anything else.

Karpathy Skills is one file that makes Claude Code ask before it guesses and stop building what you didn't ask for. Anthropic's skills repo adds the Word, Excel, PowerPoint and PDF skills Claude itself uses. Ruflo splits a big job across a swarm of agents. T3 Code runs Claude Code, Codex and your other agents in one free app. And Claude Code Game Studios is a 49-agent game studio template whose hand-offs you can copy into any project.

Between them, they have over 570,000 stars on GitHub.

Below is the install line for each one, the first thing to try, and what each repo fixes.

How do you install each repo?

Each one installs in a few lines. The /plugin commands run inside a Claude Code session, and the rest run in your terminal.

1. Karpathy Skills

Run these inside Claude Code to install it as a plugin for all your projects:

/plugin marketplace add multica-ai/andrej-karpathy-skills
/plugin install andrej-karpathy-skills@karpathy-skills

Want it in one project only? On a Mac or Linux, run this in the project's folder:

curl -o CLAUDE.md https://raw.githubusercontent.com/multica-ai/andrej-karpathy-skills/main/CLAUDE.md

That replaces any CLAUDE.md already there, so if your project has one, paste the file's contents at the end of it instead.

Try first: start your next build as normal. With the file in place, Claude Code should ask its questions before it writes code, not after a mistake, and your diffs should only show what you asked for.

2. Anthropic's skills

Two commands inside Claude Code. The second installs the Word, Excel, PowerPoint and PDF skills:

/plugin marketplace add anthropics/skills
/plugin install document-skills@anthropic-agent-skills

For the example skills too, including one that helps you write your own, run /plugin install example-skills@anthropic-agent-skills.

Try first: you use a skill by just asking for the job.

Turn this table into a real Excel file: [paste your table]

3. Ruflo

Ruflo's plugins need Claude Code 2.1.287 or later, so check yours with claude --version first. Then, inside Claude Code:

/plugin marketplace add ruvnet/ruflo
/plugin install ruflo-core@ruflo
/plugin install ruflo-swarm@ruflo
/reload-plugins

Core sets up Ruflo's tools, and swarm adds the agent teams. For the full version, with its hooks and every agent, run npx ruflo@latest init wizard in your project's terminal instead. That one adds its own folders and a CLAUDE.md to your project.

Try first: Ruflo's own guide starts with a read-only review before you let a swarm change any files.

Use Ruflo to review this project. Split the review into three separate tasks, keep it read-only, and bring me the findings with file references.

4. T3 Code

T3 Code drives the agents already on your computer, so install Claude Code and sign in first with claude auth login. Then download the desktop app from t3.codes, or install it from your terminal.

On Windows:

winget install T3Tools.T3Code

On a Mac:

brew install --cask t3-code

Try first: open a Git project, start a new thread, and Shift-click a Claude model and a Codex model in the model picker. T3 Code sends the same prompt to both, each in its own thread and worktree, so you can compare the answers. You'll need Codex set up too.

5. Claude Code Game Studios

It needs Git, Claude Code, Python 3 and Bash. On Windows, Bash comes with Git for Windows.

git clone https://github.com/Donchitos/Claude-Code-Game-Studios.git my-game
cd my-game
claude

Try first: type /start. Then open the .claude/agents folder and read how the work moves down the team, from directors to leads to specialists.

What does each repo fix?

Karpathy Skills: Claude Code asks before it guesses

Karpathy Skills is a single CLAUDE.md file written by Jiayuan (forrestchang) and built from Andrej Karpathy's notes on where AI coding goes wrong. It now lives under multica-ai and has over 228,000 stars on GitHub.

Four rules do the work: think before coding, keep it simple, change only what you were asked to, and set a clear test for success, then loop until it passes. Its README says the rules trade speed for caution, so they matter most on bigger changes.

Anthropic's skills: real Word, Excel, PowerPoint and PDF files

This is Anthropic's official public skills repo, with over 186,000 stars. It holds the document skills behind Claude's own file features, plus example skills and a template for writing your own.

It's free to use, but the Word, Excel, PowerPoint and PDF skills are source-available, not open source. Anthropic shares the repo for demonstration and learning, so test the skills on your own files before you rely on them.

Ruflo: one big job, split across a swarm of agents

Ruflo, formerly Claude Flow, is a free, MIT-licensed harness from Reuven Cohen (rUv), with over 80,000 stars. Instead of one long chat grinding through a big job, it coordinates a swarm of agents, from Claude Code to Codex, with a memory they share.

It's a big framework, so start with the two plugins and add more when you need them. Its own guide is clear that more agents aren't automatically cheaper, so give a swarm one job with a clear finish line.

T3 Code: every coding agent you pay for, in one app

T3 Code is a free, MIT-licensed app from Theo's team, with over 43,000 stars. It controls the agents already set up on your computer, including Claude Code, Codex, Cursor and OpenCode, from one desktop, web or phone app, so you stop juggling terminal tabs.

There's nothing to pay T3 Code, but it runs on your own Claude or Codex plan. Its FAQ says Claude used through T3 Code can drain your five-hour limit faster than Claude Code on its own, and its README calls the project very early, so expect bugs.

Claude Code Game Studios: 49 agents whose hand-offs you can copy

Claude Code Game Studios is a free, MIT-licensed template with over 34,000 stars. It's built for games, with set-ups for Godot, Unity and Unreal, and it turns one Claude Code session into a studio of 49 agents.

The agents sit in three tiers, from directors down to department leads and specialists, QA included. Work moves down the tiers, and nothing gets written without your sign-off. Each agent is a plain markdown file, so you can copy the pattern into any project, game or not.

For five more free repos that make Claude Code plan and review its own work, see our GitHub repos for Claude Code. To find the jobs costing your team the most time, take the free AI bottleneck test, or read our insights on AI implementation.