The 8 Best Claude Code Skills for Building AI Apps

Ranked by quality, maintenance and a safety scan of every file · Updated September 2026

Skills for LLM features: prompts, RAG, embeddings and agent SDKs. We compared 8 Claude Code Skills for Building AI Apps that pass our quality bar, 100% of which came up clean on our safety scan; these are the top 8, no more than three from any one repository.

1
add-karpathy-llm-wiki
by nanocoai
Add a persistent wiki knowledge base to a NanoClaw group. Based on Karpathy's LLM Wiki pattern. Triggers on "add wiki", "wiki", "knowledge base", "llm wiki", "karpathy wiki".
Quality 93/100Safety scan clean★ 30,846Updated 4 days ago
Why it is here: updated 4 days ago; clean safety scan; 30,846 GitHub stars.
```
npx skills add nanocoai/nanoclaw --skill add-karpathy-llm-wiki
```
2
ai-seo
by coreyhaines31
When the user wants to optimize content for AI search engines, get cited by LLMs, or appear in AI-generated answers. Also use when the user mentions 'AI SEO,' 'AEO,' 'GEO,' 'LLMO,' 'answer engine optimization,' 'generative engine optimization,' 'LLM optimization,' 'AI Overviews,' 'optimize for ChatG…
Quality 98/100Safety scan clean★ 51,376Updated 24 days ago
Why it is here: highest quality score in this list; updated 24 days ago; clean safety scan.
```
npx skills add coreyhaines31/marketingskills --skill ai-seo
```
3
nano-banana-pro-prompts-recommend-skill
by YouMind-OpenLab
AI skill for OpenClaw & Claude Code — recommend from 10000+ Nano Banana Pro (Gemini) image prompts. Smart search by use case, content remix, sample images.
Quality 92/100Safety scan clean★ 1,863Updated today
Why it is here: updated in the last day; clean safety scan; 1,863 GitHub stars.
```
npx skills add YouMind-OpenLab/nano-banana-pro-prompts-recommend-skill
```
4
kermt-finetune
by NVIDIA
Finetune a pretrained KERMT encoder on a labeled CSV. Validate the checkpoint and data, prepare features, and run containerized training. Use a local checkpoint or optionally download a pinned Hugging Face model bundle using HF_TOKEN if configured.
Quality 92/100Not yet scanned★ 3,421Updated 5 days ago
Why it is here: updated 5 days ago; 3,421 GitHub stars.
```
npx skills add NVIDIA/skills --skill kermt-finetune
```
5
llm-council-skill
by gcpdev
A skill to claude code that enables brainstorming with other LLMs (ChatGPT, Gemini) before presenting the implementation plan to the user
Quality 81/100Safety scan clean★ 454Updated 2026-01-08
Why it is here: clean safety scan.
```
npx skills add gcpdev/llm-council-skill
```
6
llm-wiki-plugin
by praneybehl
Andrej Karpathy's LLM Wiki pattern as a skill & Claude Code plugin — turn accumulated sources into a self-maintaining, scalable markdown knowledge base.
Quality 89/100Safety scan clean★ 114Updated 16 days ago
Why it is here: updated 16 days ago; clean safety scan.
```
npx skills add praneybehl/llm-wiki-plugin
```
7
orangeo-ai-visibility-skill
by OranAi-Ltd
Open-source GEO / AEO skill for AI visibility readiness: check robots.txt, llms.txt, schema, citation signals, competitor gaps, and buyer prompts
Quality 80/100Safety scan clean★ 138Updated 2026-06-09
Why it is here: clean safety scan.
```
npx skills add OranAi-Ltd/orangeo-ai-visibility-skill
```
8
llm-wiki
by 6eanut
Claude Code skill for building persistent, interlinked knowledge bases from source documents. Knowledge is compiled once and kept current — never re-derived per query. Based on Karpathy's LLM Wiki pattern.
Quality 81/100Safety scan clean★ 47Updated 2026-05-13
Why it is here: clean safety scan.
```
npx skills add 6eanut/llm-wiki
```

Side by side

#	Name	Quality	Safety	Stars	Updated
1	add-karpathy-llm-wiki	93	Clean	30,846	4 days ago
2	ai-seo	98	Clean	51,376	24 days ago
3	nano-banana-pro-prompts-recommend-skill	92	Clean	1,863	today
4	kermt-finetune	92	Pending	3,421	5 days ago
5	llm-council-skill	81	Clean	454	2026-01-08
6	llm-wiki-plugin	89	Clean	114	16 days ago
7	orangeo-ai-visibility-skill	80	Clean	138	2026-06-09
8	llm-wiki	81	Clean	47	2026-05-13

How we rank

Only skills we have read make the list: the file itself was fetched, it has a real description, it scores at least 55 of 100 on quality, its source still exists, its repository has at least 20 GitHub stars, and our safety scan found nothing high-risk. The order then follows adoption (GitHub stars, on a log scale), how squarely it fits this topic, and its quality score (how substantial and well structured the file is and how recently it changed), moved up for a clean safety scan and for real installs through the SkillAgent MCP server, and down for safety notes. At most three come from any one repository, and tools sold on evading bot detection are never listed. We do not rank by install counts reported by a command-line tool: they are easy to inflate, and our research found repositories with no stars claiming hundreds of thousands of installs. The list is recomputed on every visit.

Questions

What is the best Claude Code Skill for Building AI Apps?

add-karpathy-llm-wiki by nanocoai ranks first: updated 4 days ago, clean safety scan, 30,846 GitHub stars. The full ranking above lists 8 alternatives with their trade-offs.

How do I install one?

Each entry shows a one-line command. `npx skills add` installs a skill for Claude Code, Cursor, Codex, Gemini CLI and other agents that read skill files.

Are these safe to install?

Every file is scanned for instructions that work against you: hidden text, data sent to outside servers, disabled approval prompts, leaked keys. Skills with a warning are never listed here, and 100% of the 8 we compared for this guide came up clean. Read a skill before installing it all the same: it runs with your permissions.