WSTG Data Validation Testing

WSTG Data Validation Testing is a skill for Claude Code, Codex from 0xwi11iam/Suijin. It costs 30 tokens per session (394 once invoked), scanned A, original, AGPL-3.0.

A security testing guide for finding injection flaws and cross-site scripting. Cross-site scripting runs unwanted browser code, while injection sends unintended commands or queries to a server or database.

In plain words
What is it for?
Use it to test for reflected, stored, and DOM-based cross-site scripting, SQL and LDAP injection, ORM and command injection, and format-string problems.
Why use it?
It helps reveal whether user input can alter database queries, directory searches, operating-system commands, or page content. Finding these flaws can prevent attackers from accessing data or running code.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it to test for reflected, stored, and DOM-based cross-site scripting, SQL and LDAP injection, ORM and command injection, and format-string problems.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/0xwi11iam/suijin/wstg-data-validation
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 0xwi11iam/Suijin --skill wstg-data-validation
Clone the repo
git clone --depth 1 https://github.com/0xwi11iam/Suijin

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 WSTG Data Validation Testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/0xwi11iam/suijin/wstg-data-validation/github.svg)](https://agentmods.dev/skills/0xwi11iam/suijin/wstg-data-validation)
Your own site
<a href="https://agentmods.dev/skills/0xwi11iam/suijin/wstg-data-validation"><img src="https://agentmods.dev/badge/skills/0xwi11iam/suijin/wstg-data-validation/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 WSTG Data Validation Testing

Your own site · 80×15
<a href="https://agentmods.dev/skills/0xwi11iam/suijin/wstg-data-validation"><img src="https://agentmods.dev/badge/skills/0xwi11iam/suijin/wstg-data-validation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 394 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 $0.00030 $0.00394
Opus 5.5 $0.00012 $0.00158
Sonnet 5.5 $0.00006 $0.00079
Haiku 4.5 $0.00003 $0.00039

Measured 9d ago against content hash f55b8aa3173f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

WSTG Data Validation Testing 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 9d 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.

suijin/server/agent/lib/skills/wstg-data-validation/SKILL.md · 43 lines

The source is not reproduced here

Licensed AGPL-3.0

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

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. 9d ago First seen · 43 lines · 30 tokens per session scan A f55b8aa3173f

Subscribe to this mod's changes

WSTG Data Validation Testing is a skill published in the GitHub repository 0xwi11iam/Suijin (20 stars, last pushed today), licensed AGPL-3.0. It adds 30 tokens to every session and 394 once invoked, about $0.0001 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 2026-10-19.

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