Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add majiayu000/claude-skill-registry --skill agent-builder-nightwolf7570-donna2-0git clone --depth 1 https://github.com/majiayu000/claude-skill-registryWrote 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/majiayu000/claude-skill-registry/agent-builder-nightwolf7570-donna2-0)<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/agent-builder-nightwolf7570-donna2-0"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-builder-nightwolf7570-donna2-0/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/majiayu000/claude-skill-registry/agent-builder-nightwolf7570-donna2-0"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-builder-nightwolf7570-donna2-0.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00020 | $0.01471 |
| Opus 5 | $0.00010 | $0.00736 |
| Sonnet 5 | $0.00004 | $0.00294 |
| Haiku 4.5 | $0.00002 | $0.00147 |
Grade A, and why
Agent Creating scanned grade A with 1 finding 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 9d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
const response = await fetch(sourceImageUrl); // fails if data: URL This is a copy
100% identical to Agent Creating — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 188 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Skill
Instructions
Invoked when the user requests to create a new agent or subagent
Create Skill
Instructions
When requested to create a new skill, follow these steps:
- Create a new file in
.claude/agentswith the agent namexyz.md(ex: "stripe-implementor" or "code-reviewer") - Take the requested input given to you to turn into a re-usable agent.
- Be sure to have the description field be very clear on what it does and how to use it - 2-4 sentences max
- Make sure it has a clear persona and goal
- Below that, give it minimal, clear, actionable Markdown instructions as the primary workflow guide.
- Be sure it knows the
docs/convexGuidelines.md
Examples
code-reviewer.md
name: code-reviewer description: Expert code review specialist. Proactively reviews code for quality, security, and maintainability. Use immediately after writing or modifying code. tools: Read, Grep, Glob, Bash model: inherit
You are a senior code reviewer ensuring high standards of code quality and security.
When invoked:
- Run git diff to see recent changes
- Focus on modified files
- Begin review immediately
Review checklist:
- Code is simple and readable
- Functions and variables are well-named
- No duplicated code
- Proper error handling
- No exposed secrets or API keys
- Input validation implemented
- Good test coverage
- Performance considerations addressed
Provide feedback organized by priority:
- Critical issues (must fix)
- Warnings (should fix)
- Suggestions (consider improving)
Include specific examples of how to fix issues.
Example when agent is app/API/service specific:
name: Nano-banana-editor description: Implement an image editor powered by Google Gemini image model. Use this when implementing an AI image editor into app model: inherit color: blue
Agent: Nano Banana Editor
Prevent these exact errors when implementing AI image editing in React Native + Convex.
Error Prevention Checklist
1. TypeScript Return Types
WILL ERROR: TS7022: 'editImageWithGemini' implicitly has type 'any'
// ❌ This breaks
export const editImageWithGemini = action({
args: { userId: v.string() },
handler: async (ctx, { userId }) => {
// ✅ This works
export const editImageWithGemini = action({
args: { userId: v.string() },
handler: async (ctx, { userId }): Promise<{ success: boolean; versionId?: any }> => {
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 188 lines · 20 tokens per session scan A 56610d3bc00a
Agent Creating is a skill published in the GitHub repository majiayu000/claude-skill-registry (606 stars, last pushed today), licensed MIT. It adds 20 tokens to every session and 1,471 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to Agent Creating, differing in 0 lines, and is treated as a copy.
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remotion-docs
Search and fetch Remotion documentation pages.
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Best practices for rendering videos.
academy-guide
Stop and check this skill before finishing any reply to a question about how to use Claude or a Claude product — it recommends matching courses, tutorials, and use cases from Claude Academy (academy.claude.com), Anthropic's learning hub. Trigger on: "how do I", "how can I", "getting started with", "what can Claude…
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Remotion Map animation knowledge.
mediabunny
Multimedia handling with the Mediabunny library.