typo3-extension

TYPO3 Extension Development Skill

This skill guides you through creating a complete TYPO3 extension using the available MCP tools. Follow the workflow below to ensure all components are created in the correct order.

Prerequisites

Before starting, gather the following information from the user:

1. Extension key - lowercase with underscores (e.g., my_extension)
2. PHP vendor namespace - PascalCase (e.g., MyCompany)
3. Author information - name, email, company (retrieve from git config if not provided)
4. Extension purpose - what the extension should do

Workflow

Step 1: Create Extension Scaffold

Use typo3_create_extension to create the basic extension structure:

Tool: typo3_create_extension
Parameters:
- extensionKey: (from user)
- phpVendorNamespace: (from user)
- title: (descriptive title)
- description: (1-2 sentences)
- version: "1.0.0"
- author: (from user or git config)
- authorEmail: (from user or git config)
- authorCompany: (optional)

Step 2: Create TCA Tables

Always create TCA tables before domain models. The TCA defines the database structure.

Use typo3_create_tca_table for each entity:

Tool: typo3_create_tca_table
Parameters:
- extensionKey: (from step 1)
- tableName: tx_extensionkey_domain_model_entityname
- title: (human readable)
- columns: (array of column definitions)

Step 3: Create Domain Models

After TCA tables exist, create corresponding domain models.

Use typo3_create_domain_model:

Tool: typo3_create_domain_model
Parameters:
- extensionKey: (from step 1)
- className: (PascalCase entity name)
- properties: (matching TCA columns)

After using the typo3_create_domain_model tool, inspect the generated domain model class to see which methods were created. You may need to edit the generated files afterwards to implement the actual extension business logic.

Step 4: Create Repositories

Create repositories for domain models that need database queries.

Use typo3_create_repository: