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 Tyler-R-Kendrick/agent-skills --skill agent-skillsgit clone --depth 1 https://github.com/Tyler-R-Kendrick/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/skills/tyler-r-kendrick/agent-skills/agent-skills)<a href="https://agentmods.dev/skills/tyler-r-kendrick/agent-skills/agent-skills"><img src="https://agentmods.dev/badge/skills/tyler-r-kendrick/agent-skills/agent-skills/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/tyler-r-kendrick/agent-skills/agent-skills"><img src="https://agentmods.dev/badge/skills/tyler-r-kendrick/agent-skills/agent-skills.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 | $0.00085 | $0.00930 |
| Opus 5 | $0.00043 | $0.00465 |
| Sonnet 5 | $0.00017 | $0.00186 |
| Haiku 4.5 | $0.00009 | $0.00093 |
Grade A, and why
agent-skills 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 12d 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 — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Skills
Overview
Agent Skills is an open standard from Anthropic for packaging reusable capabilities that AI agents can discover and load dynamically. A skill is a directory containing a SKILL.md file with YAML frontmatter metadata and Markdown instructions. Adopted by Claude, VS Code Copilot, OpenAI Codex, Cursor, and 25+ platforms.
Skill Structure
my-skill/
SKILL.md # Required — metadata + instructions
scripts/ # Optional — executable scripts
references/ # Optional — reference documents
assets/ # Optional — supporting files
SKILL.md Format
---
name: my-skill
description: "Use when working with My Framework to follow best practices."
license: MIT
metadata:
displayName: "My Skill"
category: frameworks
author: your-name
compatibility:
- claude
- copilot
allowed-tools:
- Bash
- Read
- Edit
---
# My Skill
## Overview
Instructions for the agent when this skill is activated...
## Best Practices
- Concrete guidance the agent should follow
- Code examples demonstrating correct usage
Required Frontmatter
| Field | Type | Rules |
|---|---|---|
name |
string | Must match directory name. Lowercase, hyphens, digits only. Max 64 chars. |
description |
string | What the skill does and when to trigger it. |
Optional Frontmatter
| Field | Type | Description |
|---|---|---|
license |
string | SPDX identifier (e.g., MIT, Apache-2.0) |
metadata |
object | Arbitrary key-value pairs (category, author, tags) |
compatibility |
list | Target platforms |
allowed-tools |
list | Tools the skill may use |
Description Best Practices
The description field is critical for discovery — agents use it to decide when to activate the skill:
- Start with a trigger phrase: "Use when working with X…"
- Be specific: "Use when configuring ASP.NET Core middleware" not "Web development skill"
- Keep it under 200 characters
Content Guidelines
- Keep the main SKILL.md under 500 lines (~5000 tokens)
- Use concrete code examples, not abstract descriptions
- Include "do this, not that" guidance
- Structure with clear headings for scanability
What ships with it
7 files 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.
- 12d ago First seen · 122 lines · 85 tokens per session scan A 3e727822c3f8
agent-skills is a skill published in the GitHub repository Tyler-R-Kendrick/agent-skills (11 stars, last pushed 3mo ago), licensed MIT. It adds 85 tokens to every session and 930 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 2026-08-31.
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