TYPO3 Extension Upgrade Skill — Development skill for Claude Code
Systematic extension upgrades to newer LTS versions.
How to install TYPO3 Extension Upgrade Skill
This entry records only its repository, not the path inside it, so there is no
exact command to give. Open netresearch/typo3-extension-upgrade-skill and copy the folder into
~/.claude/skills/, or the file into ~/.claude/agents/.
What TYPO3 Extension Upgrade Skill does
A Claude Code skill for systematically upgrading TYPO3 extensions to newer LTS versions.
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README
TYPO3 Extension Upgrade Skill
A Claude Code skill for systematically upgrading TYPO3 extensions to newer LTS versions.
**Developed by [Netresearch DTT GmbH](https://www.netresearch.de/)**
🔌 Compatibility
This is an **Agent Skill** following the [open standard](https://agentskills.io) originally developed by Anthropic and released for cross-platform use.
**Supported Platforms:**
- ✅ Claude Code (Anthropic)
- ✅ Cursor
- ✅ GitHub Copilot
- ✅ Other skills-compatible AI agents
Skills are portable packages of procedural knowledge that work across any AI agent supporting the Agent Skills specification.
Overview
This skill guides extension developers through upgrading TYPO3 extensions (third-party or custom) to newer TYPO3 LTS versions with modern PHP compatibility. It covers:
- Extension Scanner - Backend module for diagnosing deprecated/removed APIs
- Rector - Automated PHP code migrations
- Fractor - Automated non-PHP file migrations (FlexForms, TypoScript, YAML, Fluid)
- PHPStan - Static analysis
- PHPUnit - Testing framework setup
Scope
This skill is for **extension developers** upgrading extension code. It does NOT cover:
- Upgrading TYPO3 project installations
- TYPO3 core upgrades
- Site/instance migrations
Supported Upgrade Paths
| From | To | Status |
|---|---|---|
| v7 | v8 | Documented |
| v8 | v9 | Documented |
| v9 | v10 | Documented |
| v10 | v11 | Documented |
| v11 | v12 | Documented |
| v12 | v13 | Documented |
| v13 | v14 | Monitoring |
| v12 | v12+v13 (dual) | Documented |
Installation
Marketplace (Recommended)
Add the [Netresearch marketplace](https://github.com/netresearch/claude-code-marketplace) once, then browse and install skills:
# Claude Code
/plugin marketplace add netresearch/claude-code-marketplacenpx ([skills.sh](https://skills.sh))
Install with any [Agent Skills](https://agentskills.io)-compatible agent:
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