stego-triage

stego-triage is a skill for Claude Code, Codex from liuxinye23/CyberStrikeAI. It costs 41 tokens per session (538 once invoked), scanned A, original, Apache-2.0.

A first-pass skill for investigating hidden data in files used in capture-the-flag security puzzles. It checks images, audio, video, PDFs, archives, and containers for metadata, embedded files, appended data, and other unusual clues.

In plain words
What is it for?
Use it to fingerprint suspicious files, inspect metadata and file structure, find nested or appended content, and decide the most likely next investigation step.
Why use it?
It helps narrow down what kind of hidden-data problem a file contains before deeper analysis. This avoids starting with complex techniques when a simple embedded file or visible text is the real clue.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to fingerprint suspicious files, inspect metadata and file structure, find nested or appended content, and decide the most likely next investigation step.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/liuxinye23/cyberstrikeai/stego-triage
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 liuxinye23/CyberStrikeAI --skill stego-triage
Clone the repo
git clone --depth 1 https://github.com/liuxinye23/CyberStrikeAI

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 stego-triage

README.md
[![agentmods](https://agentmods.dev/badge/skills/liuxinye23/cyberstrikeai/stego-triage/github.svg)](https://agentmods.dev/skills/liuxinye23/cyberstrikeai/stego-triage)
Your own site
<a href="https://agentmods.dev/skills/liuxinye23/cyberstrikeai/stego-triage"><img src="https://agentmods.dev/badge/skills/liuxinye23/cyberstrikeai/stego-triage/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 stego-triage

Your own site · 80×15
<a href="https://agentmods.dev/skills/liuxinye23/cyberstrikeai/stego-triage"><img src="https://agentmods.dev/badge/skills/liuxinye23/cyberstrikeai/stego-triage.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 538 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.00538
Opus 5 $0.00020 $0.00269
Sonnet 5 $0.00008 $0.00108
Haiku 4.5 $0.00004 $0.00054

Measured 10d ago against content hash af5d48fb28d5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

stego-triage 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 10d 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/stego-triage/SKILL.md · 79 lines

What it actually says

隐写题首轮分流

何时使用

当题目给出图片、音频、视频、PDF、压缩包,或提示“隐藏信息”“看起来正常但有异常体积/元数据/尾部数据”时使用。

快速流程

  1. 看文件类型、大小、后缀、实际 magic、元数据。
  2. 检查是否存在嵌套文件、尾部附加、异常块、异常颜色或通道。
  3. 判断题目更像“直接藏数据”还是“文件本身就是线索”。

重点检查

元数据

  • 作者、时间、设备、注释、坐标、缩略图、软件名。
  • 异常元数据本身可能就是 flag 入口或下一步提示。

容器结构

  • 图片与压缩格式中是否嵌有第二层文件或多余数据。
  • 有些题目不是复杂隐写,只是拼接、伪装或简单结构篡改。

文本与可见痕迹

  • 文件里是否直接残留路径、口令提示、脚本片段、假 flag。
  • 对音频/图像题先确认有没有更直接的文字或压缩层线索,再决定是否做更深分析。

建议工具

  • exiftool
  • binwalk
  • foremost
  • zsteg
  • strings

输出要求

  • 文件指纹
  • 元数据异常
  • 嵌套/附加对象
  • 最可能的下一步
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. 10d ago First seen · 79 lines · 41 tokens per session scan A af5d48fb28d5

Subscribe to this mod's changes

stego-triage is a skill published in the GitHub repository liuxinye23/CyberStrikeAI (0 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 41 tokens to every session and 538 once invoked, about $0.0002 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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