skill-verify

skill-verify is a skill for Claude Code from redhat-community-ai-tools/harness-eval. It costs 48 tokens per session (348 once invoked), scanned C, original, Apache-2.0.

A safety and quality check for an agent skill or setup before you install it. It scans the files and gives a SAFE, CAUTION, or UNSAFE result with its findings.

In plain words
What is it for?
Use it to check a downloaded folder or a skill copied from a repository before installation.
Why use it?
It helps you spot security and quality problems before untrusted code or instructions become part of your agent setup.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the harness-eval plugin — 5 skills, 6 commands shipped together

Good fit Use it to check a downloaded folder or a skill copied from a repository before installation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/redhat-community-ai-tools/harness-eval/skill-verify
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 redhat-community-ai-tools/harness-eval --skill skill-verify
Clone the repo
git clone --depth 1 https://github.com/redhat-community-ai-tools/harness-eval

Made for: Claude Code.

Or install harness-eval, the plugin that ships this one along with the rest of its 5 skills, 6 commands.

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 skill-verify

README.md
[![agentmods](https://agentmods.dev/badge/skills/redhat-community-ai-tools/harness-eval/skill-verify/github.svg)](https://agentmods.dev/skills/redhat-community-ai-tools/harness-eval/skill-verify)
Your own site
<a href="https://agentmods.dev/skills/redhat-community-ai-tools/harness-eval/skill-verify"><img src="https://agentmods.dev/badge/skills/redhat-community-ai-tools/harness-eval/skill-verify/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.

agentmods 80×15 button for skill-verify

Your own site · 80×15
<a href="https://agentmods.dev/skills/redhat-community-ai-tools/harness-eval/skill-verify"><img src="https://agentmods.dev/badge/skills/redhat-community-ai-tools/harness-eval/skill-verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 348 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 $0.00048 $0.00348
Opus 5 $0.00024 $0.00174
Sonnet 5 $0.00010 $0.00070
Haiku 4.5 $0.00005 $0.00035

Measured 9d ago against content hash 1c9fc7bf92e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade C, and why

skill-verify scanned grade C with 1 finding 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- evaluator-ignore: content/allowed-tools-auto-approve -->
skills/skill-verify/SKILL.md · 48 lines

What it actually says

Skill Verify

Vet a skill or setup for security and quality issues before installing.

Hard Rules

  1. Run the CLI command. Do not skip the scan.
  2. Report the verdict clearly. SAFE, CAUTION, or UNSAFE.
  3. Show all findings with fix suggestions.

Step 1: Get the Path

Ask the user for the path to the skill or setup directory to verify. If they provide a URL, clone it first:

git clone --depth 1 <url> /tmp/skill-to-verify

Step 2: Run the Scan

uvx --from harness-eval harness-eval skill-verify <path> --format json

If uvx is not available, fall back to pip install harness-eval and use harness-eval directly.

Read the JSON output.

Step 3: Present the Results

Report the verdict prominently: SAFE, CAUTION, or UNSAFE.

List all findings with their severity, rule, message, and fix suggestion.

If UNSAFE, tell the user not to install without addressing the findings. If CAUTION, tell the user to review the warnings before installing. If SAFE, tell the user it's safe to install.

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. 9d ago First seen · 48 lines · 48 tokens per session scan C 1c9fc7bf92e8

Subscribe to this mod's changes

skill-verify is a skill published in the GitHub repository redhat-community-ai-tools/harness-eval (27 stars, last pushed 2d ago), licensed Apache-2.0. It adds 48 tokens to every session and 348 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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