# Relationship Between Claude Code Skills and Cursor Rules: A Complete Guide

> Explore the relationship between Claude Code skills and Cursor rules. Understand how these mirrored configurations enforce identical behavioral guidelines for developers.

- Repository: [multica-ai/andrej-karpathy-skills](https://github.com/multica-ai/andrej-karpathy-skills)
- Tags: deep-dive
- Published: 2026-04-19

---

**Claude Code skills and Cursor rules are mirrored configurations that enforce the same behavioral guidelines—Claude uses [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) packaged as a plugin, while Cursor uses `.cursor/rules/karpathy-guidelines.mdc` with `alwaysApply: true`.**

The `multica-ai/andrej-karpathy-skills` repository distributes Andrej Karpathy’s four coding principles in dual formats to ensure seamless integration across AI-assisted development environments. Understanding the relationship between Claude Code skills and Cursor rules helps teams maintain consistent code quality standards regardless of their preferred editor.

## How the Two Formats Mirror Each Other

Both implementations encode identical behavioral constraints derived from Karpathy’s methodology: **Think Before Coding**, **Simplicity First**, **Surgical Changes**, and **Goal-Driven Execution**. The repository maintains strict parity between the two files to prevent environment-specific drift.

### Claude Code Implementation

Claude Code consumes the guidelines through [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md), which serves as the master document for the `forrestchang/andrej-karpathy-skills` plugin. When installed via the marketplace, the plugin exposes the skill under the identifier `karpathy-guidelines`, making the principles available during code generation, review, and refactoring sessions.

Source location: [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) (repository root)

### Cursor Implementation

Cursor implements the same constraints through `.cursor/rules/karpathy-guidelines.mdc`, located in the repository’s `.cursor/rules/` directory. The file includes the `alwaysApply: true` directive, ensuring the rules activate automatically when the repository opens in Cursor without requiring manual configuration.

Source location: `.cursor/rules/karpathy-guidelines.mdc`

## Installation and Configuration

### Installing the Claude Code Skill

Add the plugin from within Claude Code to enable the guidelines across your sessions:

```markdown
/plugin marketplace add forrestchang/andrej-karpathy-skills
/plugin install andrej-karpathy-skills@karpathy-skills

```

Once installed, the skill `karpathy-guidelines` becomes available for every Claude Code interaction, enforcing the four principles during AI-assisted coding.

### Enabling Cursor Rules (Zero Configuration)

Opening the repository in Cursor automatically activates the rules:

1. Clone or open the repository folder in Cursor.
2. Navigate to **Settings → Rules** to verify that `karpathy-guidelines` appears with the status *always applied*.

To apply these rules to a different project, copy the rule file manually:

```bash
mkdir -p .cursor/rules
cp path/to/karpathy-guidelines.mdc .cursor/rules/

```

## Synchronization Strategy

The repository requires manual synchronization between [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) and `.cursor/rules/karpathy-guidelines.mdc` whenever the four principles undergo modification. The [`README.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/README.md) and [`CURSOR.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CURSOR.md) files explicitly instruct contributors to maintain parity between these artifacts.

### Manual Sync Workflow

After editing the principles in [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md), propagate changes to the Cursor rule:

```bash

# Overwrite the Cursor rule with the updated Claude guidelines

cp CLAUDE.md .cursor/rules/karpathy-guidelines.mdc

```

### Automated Synchronization Script

Create a bash script to ensure consistency before committing:

```bash
#!/usr/bin/env bash

# sync-guidelines.sh – maintain parity between Claude and Cursor formats

cp CLAUDE.md .cursor/rules/karpathy-guidelines.mdc
echo "Synchronized karpathy-guidelines to Cursor rules"

```

Execute this script prior to each commit to prevent environment-specific drift.

## Key Differences in Usage

While the underlying principles remain identical, the interaction models differ:

- **Claude Code**: Skills are **explicitly invoked** during conversations. The `karpathy-guidelines` skill surfaces contextually when Claude generates or reviews code, but users can reference it explicitly for specific guidance.

- **Cursor**: Rules are **implicitly enforced** during editing. The `.mdc` file operates continuously in the background, constraining AI-generated suggestions without requiring explicit user prompts.

## Summary

- The `multica-ai/andrej-karpathy-skills` repository provides identical coding principles in two formats: [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) for Claude Code and `.cursor/rules/karpathy-guidelines.mdc` for Cursor.
- Claude Code implements these as a marketplace plugin skill (`karpathy-guidelines`) that users can invoke during sessions.
- Cursor implements these as always-on rules that apply automatically when the repository opens.
- Contributors must synchronize changes between [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) and the Cursor rule file to maintain consistency across environments.

## Frequently Asked Questions

### What is the difference between a Claude Code skill and a Cursor rule?

A **Claude Code skill** is a packaged plugin installed via the marketplace that exposes specific guidelines or capabilities during conversational AI sessions. A **Cursor rule** is a file-based configuration stored in `.cursor/rules/` that automatically constrains AI behavior during editing without requiring explicit user invocation. Both achieve the same behavioral outcome but differ in activation mechanisms.

### How do I install the karpathy-guidelines in my development environment?

For **Claude Code**, run `/plugin marketplace add forrestchang/andrej-karpathy-skills` and `/plugin install andrej-karpathy-skills@karpathy-skills` within your Claude Code session. For **Cursor**, simply open the repository containing `.cursor/rules/karpathy-guidelines.mdc`; the rule applies automatically due to the `alwaysApply: true` directive.

### Why does the repository maintain two separate files for the same guidelines?

The repository maintains [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) and `.cursor/rules/karpathy-guidelines.mdc` as **mirrored artifacts** because Claude Code and Cursor consume configuration through incompatible formats. Claude Code requires markdown-based skill definitions installable via its plugin marketplace, while Cursor requires `.mdc` rule files stored in a specific directory structure. Maintaining both ensures the Karpathy coding principles work out-of-the-box regardless of which AI editor a developer chooses.

### What happens if I only update one file and not the other?

If you update [`CLAUDE.md`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/CLAUDE.md) without synchronizing `.cursor/rules/karpathy-guidelines.mdc`, **Claude Code users will see updated principles while Cursor users will continue following outdated guidelines**. This creates environment-specific drift where the same repository enforces different coding standards depending on the AI editor used. The repository documentation explicitly warns against this and recommends using the [`sync-guidelines.sh`](https://github.com/multica-ai/andrej-karpathy-skills/blob/main/sync-guidelines.sh) script or manual `cp` command to maintain parity.