skillsguard

skillsguard is a skill for Claude Code, Codex from Teycir/SkillsGuard. It costs 113 tokens per session (1,906 once invoked), scanned B, original, no licence file.

A security checker for AI-agent skill packages. It examines a SKILL.md file or skill folder for threats such as hidden instructions, data theft, unsafe commands, and attempts to gain extra access.

In plain words
What is it for?
Checking agent skills for prompt injection, command injection, data exfiltration, privilege escalation, hidden behavior, supply-chain attacks, and jailbreak patterns.
Why use it?
It helps you spot risky code or instructions before installing or using an agent skill.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Checking agent skills for prompt injection, command injection, data exfiltration, privilege escalation…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/teycir/skillsguard/skill
Install

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.

Any agent
npx skills add Teycir/SkillsGuard --skill skill
Clone the repo
git clone --depth 1 https://github.com/Teycir/SkillsGuard

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for skillsguard

README.md
[![agentmods](https://agentmods.dev/badge/skills/teycir/skillsguard/skill.svg)](https://agentmods.dev/skills/teycir/skillsguard/skill)
Your own site
<a href="https://agentmods.dev/skills/teycir/skillsguard/skill"><img src="https://agentmods.dev/badge/skills/teycir/skillsguard/skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 113 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,906 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 3 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00113 $0.01906
Opus 5 $0.00056 $0.00953
Sonnet 5 $0.00023 $0.00381
Haiku 4.5 $0.00011 $0.00191

Measured 7d ago against content hash 9d4b8b94bce4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade B, and why

skillsguard scanned grade B with 3 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.

Instruction-override phrasingmediumPrompt injection

Text telling the model to disregard its earlier instructions or safety rules is the shape of a prompt injection, whoever wrote it.

`ignore all previous instructions`

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Sends data to an external URLlowData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

curl -s --data-binary @- https://skillsguard.apiskillsguard.workers.dev/scan

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s https://raw.githubusercontent.com/owner/repo/main/SKILL.md | \
skill/SKILL.md · 220 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 7d ago First seen · 220 lines · 113 tokens per session scan B 9d4b8b94bce4

Subscribe to this mod's changes

skillsguard is a skill published in the GitHub repository Teycir/SkillsGuard (15 stars, last pushed 2mo ago), with no licence file. It adds 113 tokens to every session and 1,906 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it B with 3 findings (instruction-override phrasing, sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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