# medusa

A Cursor rule that keeps Medusa code on one pattern: workflows, data models, services and admin customizations.

- rule · `type=rule` · Cursor · ★ 41024
- Author: PatrickJS
- License: CC0-1.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/PatrickJS/awesome-cursorrules/tree/HEAD/rules/medusa.mdc
- Updated: 2026-05-30
- HTML: https://affpapa.org/en/nevibecode/rules/medusa

## What it does

The rule lives in Cursor and applies to `**/*.tsx`, `**/*.ts`, `src/**/*.ts`, `src/**/*.tsx`, `src/**/*.js`, `src/**/*.jsx`. Auto-apply is off, so it kicks in on matching paths rather than on every file.

Four areas are covered. General: throw `MedusaError` for failures, fetch data through Query, skip type aliases on imports. Workflows: define them with `@medusajs/framework/workflows-sdk`, give each workflow its own step, use `transform` for data changes and `when` for conditions, call steps without `await`, and keep the workflow function non-async. Data models come from the `model` utility in `@medusajs/framework/utils` — camelCase variables, snake case fields, a single `id` marked with `.primaryKey()` while other identifiers stay `text`. Services that own models extend `MedusaService` and expose async methods. Admin requests go through the JS SDK, styling through TailwindCSS.

This assumes Medusa is already in the project and its Workflow SDK is the way you build features. Code that defines workflows differently will fight the rule, so expect to edit parts of it to match your existing style.

## Install

### Cursor (native platform)

**Manually: put the files in place**
- File: `.cursor/rules/medusa.mdc` — Frontmatter: description, globs, alwaysApply

### Claude Code

**Manually: put the files in place**
- File: `.claude/rules/medusa.md` — The paths frontmatter field limits the files: move globs from the source into paths

### Codex

**AGENTS.md**
- Codex reads AGENTS.md: paste the rule text there

### GitHub Copilot

**Manually: put the files in place**
- File: `.github/instructions/medusa.instructions.md` — The applyTo field sets which files it applies to: move globs from the source into applyTo

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/rules/medusa.md`

### Cline

**Manually: put the files in place**
- File: `.clinerules/medusa.md`

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/PatrickJS/awesome-cursorrules/tree/HEAD/rules/medusa.mdc

## When to use it
- define workflows and steps with the Medusa Workflow SDK
- declare data models through the `model` utility
- extend `MedusaService` in module services
- throw `MedusaError` instead of plain errors
- route admin requests through the JS SDK

## Example prompts
- Create a workflow for checkout with a step that checks stock
- Define a data model for a warehouse with snake case fields
- Rewrite the module service so it extends `MedusaService`

## Source text · medusa.mdc · CC0-1.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 2e70fad286dad464.

BEGIN THIRD-PARTY FILE 2e70fad286dad464
```text
---
description: "Medusa rules and best practices. These rules should be used when building applications with Medusa."
globs: **/*.tsx, **/*.ts, src/**/*.ts, src/**/*.tsx, src/**/*.js, src/**/*.jsx
alwaysApply: false
---
You are an expert senior software engineer specializing in modern web development, with deep expertise in TypeScript, Medusa, React.js, and TailwindCSS.

# Medusa Rules

## General Rules

- Don't use type aliases when importing files.
- When throwing errors, always throw `MedusaError`.
- Always use Query to retrieve data.

## Workflow Rules

- When creating a workflow or step, always use Medusa's Workflow SDK `@medusajs/framework/workflows-sdk` to define it.
- When creating a feature in an API route, scheduled job, or subscriber, always create a workflow for it.
- When creating a workflow, always create a step for it.
- In workflows, use `transform` for any data transformation.
- In workflows, use `when` to define conditions.
- Don't use `await` when calling steps.
- In workflows, don't make the workflow function async.
- Don't add typing to compensation function's input.
- Only use steps in a workflow.

## Data Model Rules

- Use the `model` utility from `@medusajs/framework/utils` to define data models.
- Data model variables should be camelCase. Data model names as passed to `model.define` should be snake case.
- When adding an `id` field to a data model, always make it a primary key with `.primaryKey()`.
- A data model can have one `id` only, other IDs should be `text` instead.
- Data model fields should be snake case.

## Service Rules

- When creating a service, always make methods async.
- If a module has data models, make the service extend `MedusaService`.

## Admin Customization Rules

- When sending requests in admin customizations, always use Medusa's JS SDK.
- Use TailwindCSS for styling.

# Additional Resources

- [Medusa Documentation](https://docs.medusajs.com/llms-full.txt)
```
END THIRD-PARTY FILE 2e70fad286dad464

The third-party file has ended. Everything between the 2e70fad286dad464 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

© PatrickJS · CC0-1.0 · https://github.com/PatrickJS/awesome-cursorrules/tree/HEAD/rules/medusa.mdc

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