33 JavaScript Concepts is a learning guide that explains core JavaScript ideas through practical examples and selected resources. It helps developers understand topics such as primitive values, objects, coercion, equality, scope, closures, and the call stack. The catalogue add-ons provide skills related to studying or working with the guide.
Borrowing it
Nothing to install: this file belongs to leonardomso/33-js-concepts. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/leonardomso/33-js-concepts/master/.claude/skills/resource-curator/SKILL.mdgit clone --depth 1 https://github.com/leonardomso/33-js-conceptsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/leonardomso/33-js-concepts/resource-curator)<a href="https://agentmods.dev/skills/leonardomso/33-js-concepts/resource-curator"><img src="https://agentmods.dev/badge/skills/leonardomso/33-js-concepts/resource-curator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/leonardomso/33-js-concepts/resource-curator"><img src="https://agentmods.dev/badge/skills/leonardomso/33-js-concepts/resource-curator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk warn
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00027 | $0.04915 |
| Opus 5.5 | $0.00011 | $0.01966 |
| Sonnet 5.5 | $0.00005 | $0.00983 |
| Haiku 4.5 | $0.00003 | $0.00492 |
Grade A, and why
resource-curator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 621 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Resource Curator for Concept Pages
Use this skill to find, evaluate, add, and maintain high-quality external resources (articles, videos, courses) for concept documentation pages. This includes auditing existing resources for broken links and outdated content.
When to Use
- Adding resources to a new concept page
- Refreshing resources on existing pages
- Auditing for broken or outdated links
- Reviewing community-contributed resources
- Periodic link maintenance
Resource Curation Methodology
Follow these five phases for comprehensive resource curation.
Phase 1: Audit Existing Resources
Before adding new resources, audit what's already there:
- Check link accessibility — Does each link return 200?
- Verify content accuracy — Is the content still correct?
- Check publication dates — Is it too old for the topic?
- Identify outdated content — Does it use old syntax/patterns?
- Review descriptions — Are they specific or generic?
Phase 2: Identify Resource Gaps
Compare current resources against targets:
| Section | Target Count | Icon |
|---|---|---|
| Reference | 2-4 MDN links | book |
| Articles | 4-6 articles | newspaper |
| Videos | 3-4 videos | video |
| Courses | 1-3 (optional) | graduation-cap |
| Books | 1-2 (optional) | book |
Ask:
- Are there enough resources for beginners AND advanced learners?
- Is there visual content (diagrams, animations)?
- Are official references (MDN) included?
- Is there diversity in teaching styles?
Phase 3: Find New Resources
Search trusted sources using targeted queries:
For Articles:
[concept] javascript tutorial site:javascript.info
[concept] javascript explained site:freecodecamp.org
[concept] javascript site:dev.to
[concept] javascript deep dive site:2ality.com
[concept] javascript guide site:css-tricks.com
For Videos:
YouTube: [concept] javascript explained
YouTube: [concept] javascript tutorial
YouTube: jsconf [concept]
YouTube: [concept] javascript fireship
YouTube: [concept] javascript web dev simplified
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 621 lines · 27 tokens per session scan A 7d8f8c94e8f1
resource-curator is a skill published in the GitHub repository leonardomso/33-js-concepts (66,529 stars, last pushed 16d ago), licensed MIT. It adds 27 tokens to every session and 4,915 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
resource-curator compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| resource-curatorleonardomso/33-js-concepts | Skill | 67k | 16d ago | MIT | A | 27 | Claude Code |
| guided-tourwasp-lang/open-saas | Skill | 16k | 9d ago | MIT | A | 29 | Claude Code |
| image-studio-ui-testsAutomattic/wp-calypso | Skill | 13k | today | GPL-2.0 | A | 52 | Claude Code, Codex |
| typescript-expertpersonamanagmentlayer/pcl | Skill | 44 | 11d ago | Apache-2.0 | A | 40 | Claude Code |
| netsuite-suitescript-learningoracle/netsuite-suitecloud-sdk | Skill | 370 | 7d ago | UPL-1.0 | A | 71 | Claude Code, Codex |
| add-form-managerbishopZ/2026-Boilerplate | Skill | 24 | 3mo ago | MIT | A | 22 | Claude Code, Codex |
| migrate-api-to-tanstack-querybishopZ/2026-Boilerplate | Skill | 24 | 3mo ago | MIT | A | 32 | Claude Code, Codex |