We need to produce a 2-3 sentence plain-text summary, objective, no marketing, no superlatives, no calls to action, natural prose, no bullet points, no headings, no markdown. At most 60 words. Provide only the summary text. We need to summarize skill: "Regel 06: Tooling. Use when working with tooling." It provides guidelines and best practices. So skill does: provides guidelines and best practices for tooling usage. Problem it solves: ensures consistent, correct use of tooling, reduces errors, improves workflow.