react-security

A security guide for React front ends, including React applications built with Next.js. It covers protecting login systems, user-submitted data, browser security rules, and server-side React features.

In plain words
What is it for?
It is for writing or reviewing security-sensitive React code, setting up authentication and content-security rules, handling user input, and hardening React or Next.js applications.
Why use it?
It helps developers find and prevent common web security problems while building or reviewing React applications.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/mamamou/ai-coding-skills/react-security
Any agent
npx skills add mamamou/ai-coding-skills --skill react-security
Clone the repo
git clone --depth 1 https://github.com/mamamou/ai-coding-skills

Made for: Claude Code, Codex.

Per session 184 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,523 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00184 $0.05523
Opus 5 $0.00092 $0.02762
Sonnet 5 $0.00037 $0.01105
Haiku 4.5 $0.00018 $0.00552

Measured 3d ago against content hash 92c2891b9b2f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

react-security scanned grade A 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 3d 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.

Makes network callslowCapability

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

axios.defaults.xsrfCookieName = "csrftoken";
skills/react-security/SKILL.md · 710 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. 3d ago First seen · 710 lines · 184 tokens per session scan A 92c2891b9b2f

Subscribe to this mod's changes

react-security is a skill published in the GitHub repository mamamou/ai-coding-skills (16 stars, last pushed 2mo ago), with no licence file. It adds 184 tokens to every session and 5,523 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 1 finding (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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