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.
git clone --depth 1 https://github.com/2ykwang/agent-skillsWrote 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/commands/2ykwang/agent-skills/add-skill)<a href="https://agentmods.dev/commands/2ykwang/agent-skills/add-skill"><img src="https://agentmods.dev/badge/commands/2ykwang/agent-skills/add-skill.svg" alt="Measured on agentmods" 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 | $0.00015 | $0.00625 |
| Opus 5 | $0.00008 | $0.00313 |
| Sonnet 5 | $0.00003 | $0.00125 |
| Haiku 4.5 | $0.00002 | $0.00063 |
Grade A, and why
add-skill 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 7d 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Skill
Scaffold a new skill named $ARGUMENTS.
Workflow
1. Validate Input
- Check
$ARGUMENTSis kebab-case (^[a-z0-9]+(-[a-z0-9]+)*$). Stop with error if not. - Check
skills/$ARGUMENTS/does not already exist. Stop with error if it does.
2. Create Directory Structure
skills/<name>/
├── SKILL.md
└── README.md
3. Write SKILL.md
---
name: <name>
version: 0.0.1
category: TODO
description: "TODO — one sentence describing what this skill does and when to trigger it."
argument-hint: "<argument>"
---
## Instructions
TODO
4. Ask User
Use AskUserQuestion:
- Category — one of:
development,design-frontend,productivity,integrations,media - Description — one sentence for the skill description
Update SKILL.md frontmatter with the user's answers.
5. Write README.md
Create skills/<name>/README.md with this structure:
# <name>
<description from step 4>
## When to use
- TODO
## Usage
/skill-name
## Installation
### Claude Code
```bash
claude plugin marketplace add 2ykwang/agent-skills
claude plugin install <name>@2ykwang-agent-skills
npx skills
npx skills add 2ykwang/agent-skills --skill <name>
### 6. Generate Plugins
Run `python3 scripts/generate_plugins.py`. This generates:
- `plugins/<name>/` directory with plugin.json, README.md, and copied skills
- Updated `.claude-plugin/marketplace.json`
### 7. Update README.md Skills Table
Find the table between the two `---` separators. Append 3-row block before the closing `---`:
```markdown
| [<name>](skills/<name>) | <description> |
| | `npx skills add 2ykwang/agent-skills --skill <name>` |
| | `claude plugin install <name>@2ykwang-agent-skills` |
8. Validate and Report
Run python3 scripts/validate.py. Show output.
Print summary:
Created skills/<name>/
Next steps:
1. Edit skills/<name>/SKILL.md — replace TODOs
2. Edit skills/<name>/README.md — add "When to use" and "Usage" examples
3. just generate && just validate
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.
- 7d ago First seen · 114 lines · 15 tokens per session scan A 7022736fbe94
add-skill is a command published in the GitHub repository 2ykwang/agent-skills (19 stars, last pushed 1mo ago), licensed MIT. It adds 15 tokens to every session and 625 once invoked, about $0.0001 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 2026-08-30.
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