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-creator-ggprompts-my-gg-pluginsgit 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-creator-ggprompts-my-gg-plugins)<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/agent-creator-ggprompts-my-gg-plugins"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-creator-ggprompts-my-gg-plugins/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-creator-ggprompts-my-gg-plugins"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-creator-ggprompts-my-gg-plugins.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00053 | $0.01795 |
| Opus 5 | $0.00026 | $0.00898 |
| Sonnet 5 | $0.00011 | $0.00359 |
| Haiku 4.5 | $0.00005 | $0.00179 |
Grade A, and why
agent-creator 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 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.
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 — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Creator
This skill provides guidance for creating effective Claude Code agents.
About Agents
Agents are Markdown files with YAML frontmatter that configure Claude Code with specialized behavior. They can be used in two ways:
- Main Agent (
claude --agent name) - Starts Claude Code as this persona - Subagent (Task tool) - Spawns a focused worker that reports back
Unlike skills (which inject knowledge into context), agents fundamentally change who Claude is for that session - the system prompt, available tools, and even the model.
When to Create an Agent
| Use Case | Create Agent? | Alternative |
|---|---|---|
| Specialized persona with restricted tools | Yes | - |
| Domain expert needing specific MCPs/skills | Yes | - |
| Cost optimization (haiku for simple tasks) | Yes | - |
| Orchestrator that delegates to sub-agents | Yes | - |
| Adding domain knowledge to context | No | Create a skill |
| One-off task instructions | No | Direct prompting |
| Reusable scripts/assets | No | Create a skill |
Agent vs Skill Decision
- Agent: Changes who Claude is (persona, tools, model)
- Skill: Changes what Claude knows (knowledge, procedures, scripts)
Agents can load skills. Skills cannot become agents.
Agent Anatomy
File Location
Agents are stored as .md files in:
~/.claude/agents/- User-level (global, all projects).claude/agents/- Project-level (repo-specific, higher precedence)
Required Structure
---
name: agent-name
description: "When to use this agent. Be specific about triggers."
---
System prompt content goes here.
All Configuration Options
| Field | Required | Type | Description |
|---|---|---|---|
name |
Yes | string | Unique ID (lowercase, hyphens only) |
description |
Yes | string | When/why to invoke this agent |
tools |
No | list | Restrict to specific tools only |
model |
No | string | haiku, sonnet, opus, or omit to inherit |
permissionMode |
No | string | default, acceptEdits, plan, bypassPermissions |
skills |
No | list | Auto-load specific skills |
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 · 227 lines · 53 tokens per session scan A 778f3b850e8a
agent-creator is a skill published in the GitHub repository majiayu000/claude-skill-registry (606 stars, last pushed today), licensed MIT. It adds 53 tokens to every session and 1,795 once invoked, about $0.0003 per session on Opus 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 2026-09-03.
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