Give the agent the changelog, not its memory
Models invent TYPO3 APIs with great confidence. My fix is context, not a better prompt: feed the real changelog entries, demand a citation per change, and reject answers without one.
Writing a Claude Code skill for your TYPO3 coding rules
Stop repeating your TYPO3 conventions in every prompt. A SKILL.md with a description that triggers, short rules and reference files that load only when needed.