sast-xss

sast-xss is a skill for Claude Code, Codex from capture0x/YeepForge. It costs 99 tokens per session (7,607 once invoked), scanned A, original, no licence file.

A code-security check for finding Cross-Site Scripting (XSS), where untrusted input is inserted into web pages or scripts in unsafe ways.

In plain words
What is it for?
Use it to inspect HTML, JavaScript, and browser DOM code for possible XSS vulnerabilities. It requires an existing sast/architecture.md file produced by sast-analysis.
Why use it?
It helps locate data paths that could let an attacker run code in another user's browser. It groups the investigation into discovery, verification, and a final summary.

Skill for Claude CodeCodex

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

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/capture0x/yeepforge/sast-xss
Any agent
npx skills add capture0x/YeepForge --skill sast-xss
Clone the repo
git clone --depth 1 https://github.com/capture0x/YeepForge

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 sast-xss

README.md
[![agentmods](https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-xss.svg)](https://agentmods.dev/skills/capture0x/yeepforge/sast-xss)
Your own site
<a href="https://agentmods.dev/skills/capture0x/yeepforge/sast-xss"><img src="https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-xss.svg" alt="Measured on agentmods" height="20"></a>
Per session 99 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,607 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. 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 5.1 $0.00099 $0.07607
Opus 5 $0.00049 $0.03803
Sonnet 5 $0.00020 $0.01521
Haiku 4.5 $0.00010 $0.00761

Measured 5d ago against content hash 30015f60a044, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

sast-xss scanned grade A with 2 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 5d 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.

Unrestricted tool accesslowExcessive agency

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

XSS occurs when user-supplied input is incorporated into a web page's HTML, JavaScript, or DOM without proper escaping or sanitization. This allows attackers to inject and execute arbitrary scripts in victims' browsers,

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.

> [curl command or browser payload to confirm the finding.
modules/sast_skills/sast-xss/SKILL.md · 622 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. 5d ago First seen · 622 lines · 99 tokens per session scan A 30015f60a044

Subscribe to this mod's changes

sast-xss is a skill published in the GitHub repository capture0x/YeepForge (1 stars, last pushed 12d ago), with no licence file. It adds 99 tokens to every session and 7,607 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 2 findings (unrestricted tool access, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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