netresearch

TYPO3 Project Upgrade Skill — Development skill for Claude Code

Development community intermediate

TYPO3 project instance upgrades across major LTS versions.

How to install TYPO3 Project Upgrade Skill

This entry records only its repository, not the path inside it, so there is no exact command to give. Open netresearch/typo3-project-upgrade-skill and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What TYPO3 Project Upgrade Skill does

Claude Code skill for upgrading deployed TYPO3 project instances across major LTS versions.

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README

TYPO3 Project Upgrade Skill

Claude Code skill for upgrading deployed TYPO3 project instances across major LTS versions.

Scope

This skill covers **project-level** upgrades — the deployed website, its configuration, templates, infrastructure, and database. For upgrading extension **code** to new TYPO3 APIs, use [typo3-extension-upgrade](https://github.com/netresearch/typo3-extension-upgrade-skill).

What It Covers

sys_template → Site Sets: Migrating TypoScript constants/config to TYPO3 v13+ site set YAML files
SCSS Variable Injection: Using Bootstrap Package's ScssParser to override BS5 variables without CSS hacks
Bootstrap 4 → 5 Migration: color-contrast, link-decoration, frame custom properties, navbar changes
Bootstrap Package v12→v16: Navigation split link/button, dropdown-hover removal, position:sticky, known bugs
Infrastructure: ImageMagick in Docker, GFX configuration, processed file regeneration
Database Cleanup: sys_template deletion, FlexForm updates, stale record cleanup
Review Methodology: Structural comparison via curl, difference categorization, visual verification

Installation

Claude Code (marketplace)

claude mcp add typo3-project-upgrade -- npx @anthropic-ai/claude-code-marketplace typo3-project-upgrade

Manual

Copy `skills/typo3-project-upgrade/SKILL.md` to your Claude Code skills directory.

Assessment Checkpoints

This skill includes `checkpoints.yaml` for the [extension-assessment](https://github.com/netresearch/extension-assessment-skill) framework. Run against a TYPO3 project to verify upgrade completeness:

9 mechanical checks: Site set existence, sys_template cleanup, ImageMagick, GFX config, SCSS usage
4 LLM reviews: Site set completeness, BS4→BS5 migration, navigation, infrastructure