Today's build was the Skill Builder from the community: install it, then use it to create your first custom skill through its Q&A. I did that, but I ended up doing more, same as always. I've known that Claude Code already had its own skill-creator, written for a different setup. So instead of installing the community Skill Builder as-is, I made Claude compare the two and fold the best of the older one into the skill-builder skill: with the "concise is key" rule. The provided skill-builder in the AIS Community had the mechanics right, the old one had the design thinking. Now it has both pros. Then I tested it, and the test earned its keep. I had it audit another skill, and I caught the Skill Builder quietly breaking its own instructions. It documents the $ARGUMENTS placeholder, but when you run a skill with an argument, the system replaces every $ARGUMENTS in the file with your argument text. So a skill that teaches about $ARGUMENTS sabotages itself the moment you pass it one. The fix was to move the placeholder examples into the reference file, which the system doesn't touch. Re-ran it, came out clean. That gotcha only hits skills that are about skills, but it was a good reminder to test with the real input before you trust the thing. The lesson I keep landing on in this challenge: each day should end as a permanent capability, not just a pile of files. So today didn't just end with Skill Builder installed. The skill I built this time has the ability to write posts in my voice, checks its own attachments for anything private using a separate sub-agent, and saves them ready to paste. This post was first drafter using the said skill. Files attached: the Skill Builder itself, SKILL.md and reference.md--already checked so there's nothing private inside. Drop them into .claude/skills/skill-builder/ in your workspace, tell Claude Code you added a skill, and run it. That's the setup. Thanks to Nate for the building blocks. If you're adding your own twist to these, I'd love to see it so please do share them!