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-creationgit 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-creation)<a href="https://agentmods.dev/skills/majiayu000/claude-skill-registry/agent-creation"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-creation/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-creation"><img src="https://agentmods.dev/badge/skills/majiayu000/claude-skill-registry/agent-creation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 7 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Memory Poisoning · line 121 Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
- medium Agent Snooping · line 244 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 245 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 246 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 247 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 248 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 249 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00077 | $0.02989 |
| Opus 5 | $0.00039 | $0.01494 |
| Sonnet 5 | $0.00015 | $0.00598 |
| Haiku 4.5 | $0.00008 | $0.00299 |
Grade A, and why
agent-creation 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 — 319 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Creation Skill
Overview
Provides actionable instructions for creating standards-compliant agent definitions using templates. Agents are defined in markdown files (AGENTS.md) with YAML frontmatter specifying metadata and a clear, readable structure. This skill enforces context gathering before agent creation to ensure robust and well-defined agents.
Objective
Enable agents and users to generate agent definitions that strictly follow the required structure and conventions using the provided template. Ensure sufficient context is gathered through clarifying questions before proceeding with agent creation. Validate each agent against the JSON schema and provide a compliance checklist to ensure all requirements are met.
When to Use
Use this skill when:
- Creating a new agent definition from scratch
- Setting up project-specific agents
- Documenting agent workflows and responsibilities
- Defining agent context and skill requirements
Don't use this skill for:
- Creating individual skills (use skill-creation instead)
- Creating context prompts (use prompt-creation instead)
- Modifying existing agents without full context
References
Instructions
Step 1: Gather Context (CRITICAL - DO NOT SKIP)
Before creating an agent definition, you MUST ask clarifying questions when context is missing. Do not proceed until you have sufficient information.
Required context to gather:
- What is the primary purpose of this agent?
- What type of input will the agent receive? (e.g., files, text, objects, user queries)
- What is the expected output format? (e.g., markdown, JSON, text, files)
- Which skills does the agent need to accomplish its tasks?
- Are there any specific workflows, policies, or constraints the agent must follow?
- Who is the target audience for this agent? (e.g., developers, end-users, AI assistants)
- What technologies, frameworks, or tools will the agent interact with?
- What is the project context where this agent will operate?
- Are there any tone or communication style requirements? (e.g., formal, casual, technical)
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 · 319 lines · 77 tokens per session scan A 419cbb891d87
agent-creation is a skill published in the GitHub repository majiayu000/claude-skill-registry (606 stars, last pushed today), licensed MIT. It adds 77 tokens to every session and 2,989 once invoked, about $0.0004 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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