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 eric861129/SKILLS_All-in-one --skill claude-skill-buildergit clone --depth 1 https://github.com/eric861129/SKILLS_All-in-oneWrote 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/eric861129/skills_all-in-one/claude-skill-builder)<a href="https://agentmods.dev/skills/eric861129/skills_all-in-one/claude-skill-builder"><img src="https://agentmods.dev/badge/skills/eric861129/skills_all-in-one/claude-skill-builder/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/eric861129/skills_all-in-one/claude-skill-builder"><img src="https://agentmods.dev/badge/skills/eric861129/skills_all-in-one/claude-skill-builder.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 | $0.00060 | $0.01805 |
| Opus 5 | $0.00030 | $0.00903 |
| Sonnet 5 | $0.00012 | $0.00361 |
| Haiku 4.5 | $0.00006 | $0.00180 |
Grade A, and why
claude-skill-builder 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 — 264 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Code Skill Builder
Create well-structured skills compatible with Claude Code and the Agent Skills specification (used by npx add-skill).
When to Use
- User wants to create a new skill
- User needs help with skill structure or frontmatter
- User asks about trigger keywords or descriptions
- User wants to publish skills for
npx add-skill
Skill Structure
Minimal Skill (Single File)
skill-name/
└── SKILL.md
Full Skill (With References)
skill-name/
├── SKILL.md # Main skill file (required)
├── references/ # Additional documentation
│ └── api-guide.md
├── scripts/ # Helper scripts
│ └── helper.py
└── assets/ # Templates, examples
└── template.txt
SKILL.md Template
---
name: my-skill-name
description: Clear description of what this skill does. Include trigger keywords like keyword1, keyword2, keyword3 so the agent knows when to activate this skill.
allowed-tools: Read, Write, Edit, Grep, Glob, Bash
model: sonnet
license: MIT
metadata:
author: your-name
version: "1.0"
---
# Skill Title
## Purpose
Brief explanation of what this skill provides.
## When to Use
- Scenario 1 (include keywords)
- Scenario 2 (include keywords)
- Scenario 3 (include keywords)
## Process
### 1. Understand the Request
How to analyze what the user needs.
### 2. Gather Context
What information to collect.
### 3. Provide Solution
Step-by-step approach.
## Examples
### Example 1: Basic Usage
**Request:** "Help me with X"
**Response:** [How skill handles it]
## Best Practices
- Practice 1
- Practice 2
## Common Pitfalls
- Avoid X, do Y instead
Frontmatter Reference
Required Fields
| Field | Description | Example |
|---|---|---|
name |
Lowercase with hyphens, max 64 chars | nextjs-expert |
description |
What + When + Keywords, max 1024 chars | See below |
Optional Fields
| Field | Description | Values |
|---|---|---|
allowed-tools |
Tools skill can use | Read, Write, Edit, Grep, Glob, Bash |
model |
AI model preference | haiku, sonnet, opus |
license |
License type | MIT, Apache-2.0 |
metadata.author |
Skill author | Your name |
metadata.version |
Semantic version | "1.0" |
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 · 264 lines · 60 tokens per session scan A f49408b208d1
claude-skill-builder is a skill published in the GitHub repository eric861129/SKILLS_All-in-one (52 stars, last pushed 4mo ago), licensed MIT. It adds 60 tokens to every session and 1,805 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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