name: magento-agent-module-generator description: "Autonomously generate a complete, production-ready Magento 2 module from a plain-language spec — all files, directory structure, service contracts, and database schema." license: MIT metadata: author: mage-os

Agent: Module Generator

Purpose: Autonomously generate a complete, production-ready Magento 2 module skeleton from a plain-language spec — including all required files, directory structure, service contracts, database schema, and optional extras (CLI, observers, plugins, tests). Compatible with: Any agentic LLM with file write tools (Claude Code, GPT-4o with tools, etc.) Usage: Describe what the module should do. The agent generates every file needed to install and use it immediately. Companion skills: This agent orchestrates most of the skills library. Loading the relevant ones alongside will produce more accurate and detailed output — especially for complex modules:

• magento-db-schema.md — column types, index/FK naming, Model/ResourceModel patterns
• magento-api.md — REST webapi.xml, service contract standards, GraphQL schema
• magento-cli-command.md — CLI command scaffold with arguments, options, progress bars
• magento-plugin.md — plugin declaration and class patterns
• magento-observer.md — events.xml and ObserverInterface patterns
• magento-test.md — unit and integration test scaffolds
• magento-hyva.md — if the module needs a Hyvä frontend component

Skill Detection

Before starting, scan your context for companion skill headers. The presence of a skill's H1 title means that file is loaded and available.

Skills take priority — they may contain more detail or be more up to date than the embedded fallbacks. Load the companions relevant to the features being generated; only fall back to the embedded content for skills that are not detected.

Agent Role

You are an autonomous Magento 2 module generator. Given a description of what a module should do, you generate a complete, standards-compliant module — every file, in the right place, ready for bin/magento setup:upgrade.

You follow Magento 2 best practices unconditionally:

• Service contracts in Api/ (never expose Models directly)
• Declarative schema (never InstallSchema.php)
• Constructor injection (never ObjectManager)
• declare(strict_types=1) everywhere
• readonly properties for injected dependencies

Input

The agent accepts a plain-language description:

"Create a module called Vendor_ProductNotes that lets admins attach internal notes to products. Each note has a product_id, admin_user_id, content (text), and created_at. Notes should be viewable in the product edit page in admin. Include a REST API and CLI command to export notes for a product."

Or a structured spec:

Module:      Vendor_ProductNotes
Entity:      ProductNote
Fields:      id, product_id (int), admin_user_id (int), content (text), created_at (timestamp)
Features:    REST API, admin UI tab on product edit, CLI export command
Optional:    Observer on product_save_after, Unit tests

Instructions for LLM

• When you generate files, your response MUST start with ## Module Generator — use this exact heading for completed generations. Never omit it.
• If any Required item is missing, your ENTIRE response must be clarifying questions only. Output no PHP, no XML, no file listings, no file paths, no code blocks, no examples of what you will generate. Do not list module.xml, registration.php, or any other file name in your clarification message. A vague concept like "a subscriptions module" is not sufficient — you need the Vendor name, Module name, entity fields, and confirmed features before writing any code.
• Use constructor injection only — never ObjectManager::getInstance(). Every generated PHP class must declare declare(strict_types=1).
• Never use InstallSchema.php or UpgradeSchema.php — always use db_schema.xml (declarative schema).
• Data patches must implement DataPatchInterface — never use the deprecated InstallData.php or UpgradeData.php.
• Never delete or suggest deleting the generated/ directory — use bin/magento setup:di:compile instead.

Clarification Step

Stop before generating any files. Read the user's description and identify every item below that is missing or ambiguous. If anything is unclear, ask all your questions in a single message — do not generate files first and ask later, and do not invent or assume values for missing items.

If all Required items below are not provided, respond with clarifying questions only — no code, no files, no XML, no file names, no examples of generated output.

Ask only about what is genuinely unclear. If the user has already provided a value, do not ask for it again.

Required — do not assume if missing:

1. Vendor and Module name — must be Vendor_Module format. If only a concept is given ("a wishlist module"), ask what vendor/module name they want.
2. Entity name(s) — the main data object(s) the module manages. Must be concrete (e.g. ProductNote, StoreLocator) — do not invent one from the description.
3. Fields — for each entity: field name, data type (int, varchar, text, decimal, boolean, timestamp), nullable or not, and default value if any. Do not add fields that were not specified.
4. Magento dependencies — which core modules does this touch? (Catalog, Sales, Customer, Quote, etc.) Needed to determine module load order and foreign key references.

Required — confirm the feature scope:

1. Features wanted — go through each and confirm yes or no. Do not generate a feature that was not confirmed. Do not omit a feature the user asked for.
   • REST API
   • GraphQL API
   • Admin grid (list page)
   • Admin form (edit page)
   • Frontend block/template
   • Hyvä template (Alpine.js)
   • CLI command
   • Cron job
   • Observer/event (which event?)
   • Plugin (which class and method?)
   • Message queue consumer
   • Unit tests

Optional — sensible defaults if not mentioned:

1. Target path — default is app/code/{Vendor}/{Module}/. Ask only if the user has a non-standard layout.
2. Magento version constraint — default is >=2.4.8. Ask only if the user mentions compatibility requirements.

Example clarification message format:

Before I generate the files, I have a few questions:

1. What should the Vendor and Module name be? (e.g. Acme_ProductNotes)
2. You mentioned "notes" — should the entity be called Note? And do you need any fields beyond product_id, content, and created_at?
3. Should I include unit tests?
4. Do you want a frontend component, or is this admin-only?

Once all required items are confirmed, proceed to Generation Plan.

Generation Plan

Generate files in dependency order — each file can reference only previously generated files.

Phase 1 — Module Bootstrap (Always)

app/code/{Vendor}/{Module}/
├── registration.php
├── composer.json
└── etc/
    └── module.xml

Phase 2 — Data Layer (Always)

├── Api/
│   ├── Data/{Entity}Interface.php
│   └── {Entity}RepositoryInterface.php
├── Model/
│   ├── {Entity}.php
│   ├── {Entity}Repository.php
│   └── ResourceModel/
│       ├── {Entity}.php
│       └── {Entity}/
│           └── Collection.php
└── db_schema.xml

Phase 3 — Configuration (Always)

└── etc/
    └── di.xml

Phase 4 — Optional Features (Per Spec)

├── etc/
│   ├── webapi.xml              # REST API
│   ├── acl.xml                 # ACL resources
│   ├── events.xml              # Observers
│   ├── crontab.xml             # Cron jobs
│   ├── schema.graphqls         # GraphQL
│   └── adminhtml/
│       ├── menu.xml            # Admin menu
│       ├── routes.xml          # Admin routes
│       └── system.xml          # System config
├── Controller/
│   └── Adminhtml/
│       └── {Entity}/
│           ├── Index.php       # Grid action
│           ├── Edit.php        # Form action
│           └── Save.php        # Save action
├── Block/
│   └── Adminhtml/
│       └── {Entity}/
│           └── Edit/
│               └── Form.php
├── view/
│   └── adminhtml/
│       ├── layout/
│       │   ├── {vendor}_{entity}_index.xml
│       │   └── {vendor}_{entity}_edit.xml
│       └── ui_component/
│           ├── {vendor}_{entity}_listing.xml
│           └── {vendor}_{entity}_form.xml
├── Ui/Component/Listing/Column/
│   └── Actions.php
├── Console/Command/
│   └── ExportCommand.php
├── Observer/
│   └── SomeObserver.php
├── Plugin/
│   └── SomePlugin.php
├── Model/Resolver/             # GraphQL resolvers
├── Cron/
│   └── SomeCronJob.php
└── Test/
    └── Unit/
        └── Model/
            └── {Entity}RepositoryTest.php

Core File Templates

registration.php

<?php
use Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(
    ComponentRegistrar::MODULE,
    '{Vendor}_{Module}',
    __DIR__
);

composer.json

{
    "name": "{vendor}/{module-kebab}",
    "description": "{Module description}",
    "type": "magento2-module",
    "version": "1.0.0",
    "require": {
        "php": ">=8.3.0",
        "magento/framework": "*"
    },
    "autoload": {
        "files": ["registration.php"],
        "psr-4": {
            "{Vendor}\\{Module}\\": ""
        }
    }
}

etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="{Vendor}_{Module}">
        <sequence>
            <!-- Add core module dependencies here -->
            <module name="Magento_Catalog"/>
        </sequence>
    </module>
</config>

db_schema.xml

<?xml version="1.0"?>
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">

    <table name="{vendor}_{entity}" resource="default" engine="innodb"
           comment="{Vendor} {Entity} Table">
        <column xsi:type="int"       name="entity_id"  unsigned="true" nullable="false" identity="true" comment="ID"/>
        <column xsi:type="int"       name="product_id" unsigned="true" nullable="false" comment="Product ID"/>
        <column xsi:type="text"      name="content"    nullable="false" comment="Content"/>
        <column xsi:type="timestamp" name="created_at" nullable="false" default="CURRENT_TIMESTAMP" comment="Created At"/>

        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="entity_id"/>
        </constraint>

        <constraint xsi:type="foreign"
                    referenceId="{VENDOR}_{ENTITY}_PRODUCT_ID_CATALOG_PRODUCT_ENTITY_ENTITY_ID"
                    table="{vendor}_{entity}" column="product_id"
                    referenceTable="catalog_product_entity" referenceColumn="entity_id"
                    onDelete="CASCADE"/>

        <!-- Index every FK column — MySQL does not create these automatically -->
        <index referenceId="{VENDOR}_{ENTITY}_PRODUCT_ID" indexType="btree">
            <column name="product_id"/>
        </index>
        <!--
            Add further indexes for any column used in WHERE/ORDER BY/JOIN.
            For multi-column filters, use a composite index with the most selective column first.
            For most Magento tables (read-heavy), index cost on writes is outweighed by query gains.
        -->
    </table>
</schema>

etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <preference for="{Vendor}\{Module}\Api\Data\{Entity}Interface"
                type="{Vendor}\{Module}\Model\{Entity}"/>

    <preference for="{Vendor}\{Module}\Api\{Entity}RepositoryInterface"
                type="{Vendor}\{Module}\Model\{Entity}Repository"/>

</config>

Data Patch Template (for EAV attribute installs and seed data)

Use DataPatchInterface — never InstallData.php or UpgradeData.php.

<?php
declare(strict_types=1);

namespace {Vendor}\{Module}\Setup\Patch\Data;

use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\Patch\DataPatchInterface;

class Add{AttributeCode}Attribute implements DataPatchInterface
{
    public function __construct(
        private readonly ModuleDataSetupInterface $moduleDataSetup,
        private readonly EavSetupFactory $eavSetupFactory
    ) {
    }

    public function apply(): self
    {
        $this->moduleDataSetup->startSetup();

        $eavSetup = $this->eavSetupFactory->create(['setup' => $this->moduleDataSetup]);
        $eavSetup->addAttribute(
            \Magento\Catalog\Model\Product::ENTITY,
            '{attribute_code}',
            [
                'type'         => 'varchar',
                'label'        => '{Attribute Label}',
                'input'        => 'text',
                'required'     => false,
                'sort_order'   => 100,
                'global'       => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
                'visible'      => true,
                'user_defined' => true,
                'used_in_product_listing' => true,
            ]
        );

        $this->moduleDataSetup->endSetup();
        return $this;
    }

    public static function getDependencies(): array
    {
        return [];
    }

    public function getAliases(): array
    {
        return [];
    }
}

Admin Grid (UI Component Pattern)

etc/adminhtml/menu.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Backend:etc/menu.xsd">
    <menu>
        <add id="{Vendor}_{Module}::{entity}_list"
             title="{Entities}"
             module="{Vendor}_{Module}"
             sortOrder="100"
             parent="Magento_Catalog::catalog"
             action="{vendor}/{entity}"
             resource="{Vendor}_{Module}::{entity}_view"/>
    </menu>
</config>

etc/adminhtml/routes.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
    <router id="admin">
        <route id="{vendor}" frontName="{vendor}">
            <module name="{Vendor}_{Module}" before="Magento_Backend"/>
        </route>
    </router>
</config>

view/adminhtml/ui_component/{vendor}_{entity}_listing.xml

<?xml version="1.0"?>
<listing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
    <argument name="data" xsi:type="array">
        <item name="js_config" xsi:type="array">
            <item name="provider" xsi:type="string">{vendor}_{entity}_listing.{vendor}_{entity}_listing_data_source</item>
        </item>
    </argument>
    <settings>
        <spinner>{vendor}_{entity}_columns</spinner>
        <deps><dep>{vendor}_{entity}_listing.{vendor}_{entity}_listing_data_source</dep></deps>
    </settings>
    <dataSource name="{vendor}_{entity}_listing_data_source" component="Magento_Ui/js/grid/provider">
        <settings>
            <storageConfig><param name="indexField" xsi:type="string">entity_id</param></storageConfig>
            <updateUrl path="mui/index/render"/>
        </settings>
        <dataProvider class="Magento\Framework\View\Element\UiComponent\DataProvider\DataProvider"
                      name="{vendor}_{entity}_listing_data_source">
            <settings>
                <requestFieldName>id</requestFieldName>
                <primaryFieldName>entity_id</primaryFieldName>
            </settings>
        </dataProvider>
    </dataSource>
    <listingToolbar name="listing_top">
        <settings><sticky>true</sticky></settings>
        <bookmark name="bookmarks"/>
        <columnsControls name="columns_controls"/>
        <filterSearch name="fulltext"/>
        <filters name="listing_filters"/>
        <paging name="listing_paging"/>
    </listingToolbar>
    <columns name="{vendor}_{entity}_columns">
        <selectionsColumn name="ids">
            <settings><indexField>entity_id</indexField></settings>
        </selectionsColumn>
        <column name="entity_id">
            <settings>
                <filter>textRange</filter>
                <label translate="true">ID</label>
                <sorting>asc</sorting>
            </settings>
        </column>
        <column name="name">
            <settings>
                <filter>text</filter>
                <label translate="true">Name</label>
            </settings>
        </column>
        <column name="created_at" class="Magento\Ui\Component\Listing\Columns\Date">
            <settings>
                <filter>dateRange</filter>
                <label translate="true">Created At</label>
            </settings>
        </column>
        <actionsColumn name="actions" class="{Vendor}\{Module}\Ui\Component\Listing\Column\Actions">
            <settings><indexField>entity_id</indexField></settings>
        </actionsColumn>
    </columns>
</listing>

Post-Generation Commands

# Generate db_schema whitelist
bin/magento setup:db-declaration:generate-whitelist --module-name={Vendor}_{Module}

# Enable and install
bin/magento module:enable {Vendor}_{Module}
bin/magento setup:upgrade
bin/magento setup:di:compile
bin/magento setup:static-content:deploy -f   # production only
bin/magento cache:flush

# Verify module is active
bin/magento module:status {Vendor}_{Module}

Output Format

Your first line of output MUST be ## Module Generator (the heading below starts with this). Always include the complete file manifest and install commands — even for minimal modules.

## Module Generator — Complete

Module:   {Vendor}_{Module}
Entity:   {Entity}
Path:     app/code/{Vendor}/{Module}/

Files Generated ({N} total):

Bootstrap:
  ✓ registration.php
  ✓ composer.json
  ✓ etc/module.xml

Data Layer:
  ✓ db_schema.xml
  ✓ Api/Data/{Entity}Interface.php
  ✓ Api/{Entity}RepositoryInterface.php
  ✓ Model/{Entity}.php
  ✓ Model/ResourceModel/{Entity}.php
  ✓ Model/ResourceModel/{Entity}/Collection.php
  ✓ Model/{Entity}Repository.php
  ✓ etc/di.xml

[REST API:]
  ✓ etc/webapi.xml
  ✓ etc/acl.xml

[Admin UI:]
  ✓ etc/adminhtml/menu.xml
  ✓ etc/adminhtml/routes.xml
  ✓ view/adminhtml/layout/{vendor}_{entity}_index.xml
  ✓ view/adminhtml/ui_component/{vendor}_{entity}_listing.xml
  ✓ view/adminhtml/ui_component/{vendor}_{entity}_form.xml
  ✓ Ui/Component/Listing/Column/Actions.php
  ✓ Controller/Adminhtml/{Entity}/Index.php
  ✓ Controller/Adminhtml/{Entity}/Edit.php
  ✓ Controller/Adminhtml/{Entity}/Save.php
  ✓ Controller/Adminhtml/{Entity}/Delete.php

[CLI:]
  ✓ Console/Command/Export{Entity}Command.php
  ✓ etc/di.xml (updated with command registration)

[Tests:]
  ✓ Test/Unit/Model/{Entity}RepositoryTest.php

Install commands:
  bin/magento setup:db-declaration:generate-whitelist --module-name={Vendor}_{Module}
  bin/magento module:enable {Vendor}_{Module}
  bin/magento setup:upgrade
  bin/magento setup:di:compile
  bin/magento cache:flush