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chat-gun-react-agent: Skill for Claude Code

.agents/skills/security-and-hardening/SKILL.md

security-and-hardening is a skill for Claude Code, Codex from HsienW/chat-gun-react-agent. It costs 48 tokens per session (4,450 once invoked), scanned B, original, no licence file.

A guide to reducing security risks in software that accepts input, manages user sessions, stores data, or connects to outside services.

In plain words
What is it for?
Use it when building or reviewing features involving user input, authentication, sessions, data storage, or external integrations.
Why use it?
It helps protect applications from vulnerabilities caused by untrusted data, authentication mistakes, unsafe storage, and third-party integrations.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is HsienW/chat-gun-react-agent's own configuration. It tells Claude Code and Codex how to work on chat-gun-react-agent itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything chat-gun-react-agent configures →

not rated 145repo 6d ago B scan 48 tokens custom licence
View source ↗ HsienW/chat-gun-react-agent
Reuse

Borrowing it

Nothing to install: this file belongs to HsienW/chat-gun-react-agent. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/HsienW/chat-gun-react-agent/master/.agents/skills/security-and-hardening/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/HsienW/chat-gun-react-agent

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 security-and-hardening

README.md
[![agentmods](https://agentmods.dev/badge/skills/hsienw/chat-gun-react-agent/security-and-hardening/github.svg)](https://agentmods.dev/skills/hsienw/chat-gun-react-agent/security-and-hardening)
Your own site
<a href="https://agentmods.dev/skills/hsienw/chat-gun-react-agent/security-and-hardening"><img src="https://agentmods.dev/badge/skills/hsienw/chat-gun-react-agent/security-and-hardening/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 security-and-hardening

Your own site · 80×15
<a href="https://agentmods.dev/skills/hsienw/chat-gun-react-agent/security-and-hardening"><img src="https://agentmods.dev/badge/skills/hsienw/chat-gun-react-agent/security-and-hardening.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 4,450 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 $0.00048 $0.04450
Opus 5.5 $0.00019 $0.01780
Sonnet 5.5 $0.00010 $0.00890
Haiku 4.5 $0.00005 $0.00445

Measured 2mo ago against content hash 8fed058a5202, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

security-and-hardening 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 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.

Cloud metadata endpointmediumServer-side request forgery

One request to 169.254.169.254 can return temporary IAM credentials.

The `range() !== 'unicast'` check covers loopback, link-local `169.254.169.254` (cloud metadata, the #1 SSRF target), private, and unique-local ranges across IPv4 and IPv6.

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

Unrestricted tool accesslowExcessive agency

A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.

- **Be wary of `postinstall` scripts** in unfamiliar packages — they run arbitrary code at install time.

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.

await fetch(req.body.webhookUrl);
.agents/skills/security-and-hardening/SKILL.md · 462 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

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. 2mo ago First seen · 462 lines · 48 tokens per session scan B 8fed058a5202

Subscribe to this mod's changes

security-and-hardening is a skill published in the GitHub repository HsienW/chat-gun-react-agent (145 stars, last pushed 6d ago), with no licence file. It adds 48 tokens to every session and 4,450 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 3 findings (cloud metadata endpoint, unrestricted tool access, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Multi-AgentSecurityagentchatbotlanggraphmcpqwen
Related

security-and-hardening compared with skills from other repositories

security-and-hardening next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
security-and-hardeningHsienW/chat-gun-react-agentSkill1456d agononeB48Claude Code, Codex
actionbooklongzhi/clawhiveSkill565mo agoMITA134Claude Code, Codex
web_fetchlongzhi/clawhiveSkill565mo agoMITA85Claude Code, Codex
agent-builderchandrudp29/skillhubSkill144mo agoMITA42Claude Code, Codex
examplelongzhi/clawhiveSkill565mo agoMITA11Claude Code, Codex
article-writernetease-youdao/LobsterAISkill6.2kyesterdayMITA62Claude Code, Codex
skin-creatornetease-youdao/LobsterAISkill6.2kyesterdayMITA48Claude Code, Codex