ai-penetration-defense

ai-penetration-defense is an agent for Claude Code from ChrisRoyse/610ClaudeSubagents. It costs 37 tokens per session (3,176 once invoked), scanned B, original, no licence file.

A security assistant for AI systems that looks for attacks such as prompt injection, jailbreaking, and other weaknesses specific to language models.

In plain words
What is it for?
Use it to detect and block attacks aimed at AI agents and language models, including attacks hidden in the meaning of user input.
Why use it?
It helps protect AI applications from instructions designed to bypass their safeguards or change their behaviour.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it to detect and block attacks aimed at AI agents and language models, including attacks hidden in the meaning of user input.

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Install with agentmods
npx agentmods add agents/chrisroyse/610claudesubagents/ai-penetration-defense
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.

Clone the repo
git clone --depth 1 https://github.com/ChrisRoyse/610ClaudeSubagents

Made for: Claude Code.

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 ai-penetration-defense

README.md
[![agentmods](https://agentmods.dev/badge/agents/chrisroyse/610claudesubagents/ai-penetration-defense/github.svg)](https://agentmods.dev/agents/chrisroyse/610claudesubagents/ai-penetration-defense)
Your own site
<a href="https://agentmods.dev/agents/chrisroyse/610claudesubagents/ai-penetration-defense"><img src="https://agentmods.dev/badge/agents/chrisroyse/610claudesubagents/ai-penetration-defense/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 ai-penetration-defense

Your own site · 80×15
<a href="https://agentmods.dev/agents/chrisroyse/610claudesubagents/ai-penetration-defense"><img src="https://agentmods.dev/badge/agents/chrisroyse/610claudesubagents/ai-penetration-defense.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,176 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00037 $0.03176
Opus 5 $0.00018 $0.01588
Sonnet 5 $0.00007 $0.00635
Haiku 4.5 $0.00004 $0.00318

Measured 11d ago against content hash ca8323e98c38, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade B, and why

ai-penetration-defense scanned grade B 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 11d 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.

- **Direct Prompt Injection**: Commands attempting to override system instructions

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

agents/ai-penetration-defense.md · 289 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. 11d ago First seen · 289 lines · 37 tokens per session scan B ca8323e98c38

Subscribe to this mod's changes

ai-penetration-defense is an agent published in the GitHub repository ChrisRoyse/610ClaudeSubagents (115 stars, last pushed 1y ago), with no licence file. It adds 37 tokens to every session and 3,176 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (instruction-override phrasing). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.