A checklist of common software security protections. It focuses on unsafe input, authentication, access control, secrets, dependencies, and sensitive data.

Use it to check for SQL injection, cross-site scripting, CSRF, hardcoded secrets, insecure dependencies, missing validation, leaked errors, and authorization gaps.

It helps prevent attackers from injecting code or queries, accessing protected features, stealing secrets, or viewing private information.

security — Skill for Claude Code and Codex by AgriciDaniel

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 AgriciDaniel/claude-code-essentials-vs-code --skill security

Clone the repo

git clone --depth 1 https://github.com/AgriciDaniel/claude-code-essentials-vs-code

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/agricidaniel/claude-code-essentials-vs-code/security/github.svg)](https://agentmods.dev/skills/agricidaniel/claude-code-essentials-vs-code/security)

Your own site

<a href="https://agentmods.dev/skills/agricidaniel/claude-code-essentials-vs-code/security"><img src="https://agentmods.dev/badge/skills/agricidaniel/claude-code-essentials-vs-code/security/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/agricidaniel/claude-code-essentials-vs-code/security"><img src="https://agentmods.dev/badge/skills/agricidaniel/claude-code-essentials-vs-code/security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 5 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 148 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 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.

Model	Per session	Once invoked
Fable 5.1	$0.00005	$0.00148
Opus 5.5	$0.00002	$0.00059
Sonnet 5.5	$0.00001	$0.00030
Haiku 4.5	$0.00001	$0.00015

Measured 2mo ago against content hash 9ef10dd9d626, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

security 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 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.

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.

templates/skills/security/SKILL.md · 17 lines

What it actually says

Always check for and prevent:

SQL injection - use parameterized queries only
XSS - escape all user input in HTML output
CSRF - use tokens for state-changing requests
Hardcoded secrets - use environment variables
Insecure dependencies - use the project's existing dependency-audit tool; report missing tooling instead of installing it automatically
Missing input validation - validate all user inputs
Improper error exposure - don't leak stack traces
Missing authentication - verify auth on all protected routes
Broken access control - check authorization for every action
Sensitive data exposure - encrypt at rest and in transit

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.

2mo ago Changed 9ef10dd9d626
2mo ago First seen · 17 lines · 5 tokens per session scan A b8b34bed101c

Subscribe to this mod's changes

security is a skill published in the GitHub repository AgriciDaniel/claude-code-essentials-vs-code (66 stars, last pushed 2mo ago), licensed MIT. It adds 5 tokens to every session and 148 once invoked, about $0.0000 per session on Opus 5.5. 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 2026-08-30.

Claude Code Security ai claude-code-skill developer-tools open-source

security next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
securityAgriciDaniel/claude-code-essentials-vs-code	Skill	66	2mo ago	MIT	A	5	Claude Code, Codex
wiki-ingestAgriciDaniel/claude-obsidian	Skill	16k	14d ago	MIT	A	88	Claude Code
autoresearchAgriciDaniel/claude-obsidian	Skill	16k	14d ago	MIT	A	80	Claude Code
obsidian-basesAgriciDaniel/claude-obsidian	Skill	16k	14d ago	MIT	A	75	Claude Code
saveAgriciDaniel/claude-obsidian	Skill	16k	14d ago	MIT	A	80	Claude Code
wiki-retrieveAgriciDaniel/claude-obsidian	Skill	16k	14d ago	MIT	A	81	Claude Code
wikiAgriciDaniel/claude-obsidian	Skill	16k	14d ago	MIT	A	84	Claude Code