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security-best-practices

security-best-practices is a skill for Claude Code from lklimek/claudius. It costs 50 tokens per session (5,425 once invoked), scanned A, original, GPL-3.0.

A secure-coding guide for software involving authentication, cryptography, user input, secrets, or API endpoints. It provides practices based on OWASP, a widely used source of web-application security guidance.

In plain words
What is it for?
Use it when planning, writing, or reviewing code that handles logins, encryption, user-submitted data, credentials, secrets, or APIs.
Why use it?
It helps prevent common security mistakes that can expose accounts, sensitive data, or system access.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter.

Part of the claudius plugin — 30 skills, 8 agents, 2 hooks shipped together

not rated 1repo 6d ago A scan 50 tokens GPL-3.0

Good fit Use it when planning, writing, or reviewing code that handles logins, encryption, user-submitted data, credentials, secrets, or APIs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lklimek/claudius/security-best-practices
View source ↗ lklimek/claudius
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 lklimek/claudius --skill security-best-practices
Clone the repo
git clone --depth 1 https://github.com/lklimek/claudius

Made for: Claude Code.

Or install claudius, the plugin that ships this one along with the rest of its 30 skills, 8 agents, 2 hooks.

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-best-practices

README.md
[![agentmods](https://agentmods.dev/badge/skills/lklimek/claudius/security-best-practices.svg)](https://agentmods.dev/skills/lklimek/claudius/security-best-practices)
Your own site
<a href="https://agentmods.dev/skills/lklimek/claudius/security-best-practices"><img src="https://agentmods.dev/badge/skills/lklimek/claudius/security-best-practices.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,425 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 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 $0.00050 $0.05425
Opus 5 $0.00025 $0.02712
Sonnet 5 $0.00010 $0.01085
Haiku 4.5 $0.00005 $0.00543

Measured 6d ago against content hash adfb49f4426b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

security-best-practices scanned grade A with 0 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 6d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/security-best-practices/SKILL.md · 211 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago First seen · 211 lines · 50 tokens per session scan A adfb49f4426b

Subscribe to this mod's changes

security-best-practices is a skill published in the GitHub repository lklimek/claudius (1 stars, last pushed 6d ago), licensed GPL-3.0. It adds 50 tokens to every session and 5,425 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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