agentmods.dev

medusajs-developer

medusajs-developer is a skill for Claude Code from greedychipmunk/agent-skills. It costs 50 tokens per session (3,644 once invoked), scanned A, original, MIT.

A development guide for MedusaJS version 2.15 and newer, an e-commerce framework for building online shops. It covers custom modules, database models, API routes, workflows, scheduled jobs, and external integrations.

In plain words
What is it for?
Use it to build custom commerce modules, data models and migrations, API endpoints, workflows, scheduled jobs, authentication, and integrations with Medusa's built-in services.
Why use it?
It gives agents project-specific direction for extending MedusaJS while fitting its module, route, authentication, and commerce architecture.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

not rated 24repo 17d ago A scan SkillSpector: warn 50 tokens original MIT

Good fit Use it to build custom commerce modules, data models and migrations, API endpoints, workflows, scheduled jobs, authentication, and integrations with Medusa's built-in services.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/greedychipmunk/agent-skills/medusajs-developer
View source ↗ greedychipmunk/agent-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add greedychipmunk/agent-skills --skill medusajs-developer
Clone the repo
git clone --depth 1 https://github.com/greedychipmunk/agent-skills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for medusajs-developer

README.md
[![agentmods](https://agentmods.dev/badge/skills/greedychipmunk/agent-skills/medusajs-developer/github.svg)](https://agentmods.dev/skills/greedychipmunk/agent-skills/medusajs-developer)
Your own site
<a href="https://agentmods.dev/skills/greedychipmunk/agent-skills/medusajs-developer"><img src="https://agentmods.dev/badge/skills/greedychipmunk/agent-skills/medusajs-developer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for medusajs-developer

Your own site · 80×15
<a href="https://agentmods.dev/skills/greedychipmunk/agent-skills/medusajs-developer"><img src="https://agentmods.dev/badge/skills/greedychipmunk/agent-skills/medusajs-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,644 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 3 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Tool Misuse · line 476
    Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
    Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
  • medium MCP Rug Pull · line 95
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 544
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00050 $0.03644
Opus 5.5 $0.00020 $0.01458
Sonnet 5.5 $0.00010 $0.00729
Haiku 4.5 $0.00005 $0.00364

Measured 2mo ago against content hash f141076d0aa4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

medusajs-developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 21 executable files (scripts/build-production.sh, scripts/create-api-route.sh, scripts/create-module.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

medusajs-developer/SKILL.md · 584 lines

How it starts

The opening of the file, as written. The whole thing — 584 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MedusaJS Developer Agent Skill

An expert agent specializing in MedusaJS v2.15+ development, focusing on building scalable e-commerce solutions with custom modules, API integrations, and third-party plugins.

Core Capabilities

1. Custom Module Development

  • Data Models: Create and manage data models using MedusaJS DML
  • Module Services: Implement service layers with automatic CRUD operations
  • Module Configuration: Set up proper module structure and exports
  • Database Migrations: Generate and manage database schema changes

2. API Route Development

  • Custom Endpoints: Create REST API routes in src/api/[route-name]/route.ts
  • HTTP Methods: Implement GET, POST, PUT, DELETE handlers
  • Request/Response Handling: Manage MedusaRequest and MedusaResponse objects
  • Authentication: Integrate with MedusaJS auth systems

3. Commerce Module Integration

  • 18 Built-in Modules: Work with API Key, Auth, Cart, Customer, Order, Payment, Product, Pricing, Promotion, Tax, and more
  • Module Links: Create relationships between different modules
  • Custom Fields: Extend existing modules with additional data fields
  • Module Composition: Combine multiple modules for complex workflows

4. Workflow & Automation

  • Scheduled Jobs: Create recurring tasks with cron expressions
  • Event Handling: Implement subscribers for asynchronous operations
  • Business Logic: Orchestrate complex commerce workflows
  • Background Processing: Handle long-running operations efficiently

5. Third-Party Integrations

  • Payment Providers: Integrate custom payment gateways
  • External APIs: Connect with shipping, tax, and inventory services
  • Webhooks: Handle incoming webhooks from external systems
  • Data Synchronization: Sync data with external platforms

Medusa v2.15+ Updates

Auth & Security

  • Medusa v2.15+ includes built-in MFA primitives for auth flows.
  • Prefer module-managed TOTP, SMS, and recovery code challenges instead of rolling your own OTP storage.
  • Wire MFA into the Auth module by treating it as part of sign-in, enrollment, challenge, verify, and recovery flows.

Read the full file on GitHub · 584 lines

Files

What ships with it

29 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 584 lines · 50 tokens per session scan A f141076d0aa4

Subscribe to this mod's changes

medusajs-developer is a skill published in the GitHub repository greedychipmunk/agent-skills (24 stars, last pushed 17d ago), licensed MIT. It adds 50 tokens to every session and 3,644 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Backend and APIsE-commerce
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