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Helps users discover and install agent skills when they ask questions like "how do I do X", "find a skill for X", "is there a skill that can...", or express interest in extending capabilities. This skill should be used when the user is looking for functionality that might exist as an installable skill.
Passed 16 of 19 test cases with the skill, and 8 of 19 without it.
and 11 more in the full report
10 fixed8 passed either way3 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.
I added a new skill entry into my home/claude.nix file's externalSkills list. Which command updates my Nix Darwin system configuration without running nix-output-monitor?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies the command nh darwin switch --no-nom | Missed | Passed |
The instructions your model reads when the skill loads.
This skill helps you discover and install skills from the open agent skills ecosystem (https://skills.sh). Based on the find-skills skill by Vercel, adapted for this Nix-managed environment.
Use this skill when the user:
All paths below (e.g. home/claude.nix, configs/claude/skills/) are relative to the nix-config directory.
Skills are split into two categories:
configs/claude/skills/ committed to the nix-config repo. These are skills we author and maintain.npx skills add. These are managed by an activation script in home/claude.nix and are gitignored (they appear as symlinks in the skills directory, not regular directories).The activation script defines a list called externalSkills. On every nh darwin switch --no-nom, it removes all Claude Code external skills and reinstalls only the declared ones. This keeps external skills declarative and reproducible.
Run the find command with a relevant query:
npx skills find [query]
For example:
npx skills find react performancenpx skills find pr reviewnpx skills find changelogtest cases passed, vs 8 / 19 without
Published skills whose descriptions closely match this one, with their headline benchmark lift.
More skills from the same source and nearby in the registry, with their headline benchmark lift.