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 yiftahb/agsync --skill agent-skillsgit clone --depth 1 https://github.com/yiftahb/agsyncWrote 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/yiftahb/agsync/agent-skills)<a href="https://agentmods.dev/skills/yiftahb/agsync/agent-skills"><img src="https://agentmods.dev/badge/skills/yiftahb/agsync/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/yiftahb/agsync/agent-skills"><img src="https://agentmods.dev/badge/skills/yiftahb/agsync/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 | $0.00045 | $0.00830 |
| Opus 5.5 | $0.00018 | $0.00332 |
| Sonnet 5.5 | $0.00009 | $0.00166 |
| Haiku 4.5 | $0.00005 | $0.00083 |
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 2mo 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 — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Skills Standard
You are an expert in the Agent Skills open standard, the portable format for extending AI agents with specialized capabilities.
What Is a Skill?
A skill is a directory containing a SKILL.md file plus optional supporting files. Skills package domain-specific knowledge and workflows that agents can use to perform tasks. Skills are portable across any agent that supports the standard.
Directory Structure
skill-name/
├── SKILL.md # Required: metadata + instructions
├── scripts/ # Optional: executable code
├── references/ # Optional: documentation loaded on demand
├── assets/ # Optional: templates, images, data files
└── ... # Any additional files
SKILL.md Format
The file must contain YAML frontmatter followed by Markdown content:
---
name: skill-name
description: What this skill does and when to use it.
---
# Skill Name
Detailed instructions for the agent.
## When to Use
- Specific triggers and use cases
## Instructions
- Step-by-step guidance
Frontmatter Fields
| Field | Required | Constraints |
|---|---|---|
| name | Yes | Max 64 chars. Lowercase letters, numbers, hyphens only. Must match parent directory name. |
| description | Yes | Max 1024 chars. Describes what the skill does AND when to use it. |
| license | No | License name or reference to bundled license file. |
| compatibility | No | Max 500 chars. Environment requirements. |
| metadata | No | Arbitrary key-value mapping. |
Name Field Rules
- 1-64 characters
- Only lowercase alphanumeric and hyphens
- No leading, trailing, or consecutive hyphens
- Must match the parent directory name
Description Best Practices
- Describe both WHAT the skill does and WHEN to use it
- Include specific keywords that help agents identify relevant tasks
Progressive Disclosure
Skills are loaded in stages for context efficiency:
- Metadata (~100 tokens):
nameanddescriptionloaded at startup - Instructions (< 5000 tokens recommended): Full SKILL.md body loaded when activated
- Resources (as needed): Supporting files loaded only when required
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.
- 2mo ago First seen · 115 lines · 45 tokens per session scan A b81d99437330
agent-skills is a skill published in the GitHub repository yiftahb/agsync (10 stars, last pushed 1mo ago), licensed MIT. It adds 45 tokens to every session and 830 once invoked, about $0.0002 per session on Opus 5.5. 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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