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web-fingerprinting

web-fingerprinting is a skill for Claude Code from securityfortech/hacking-skills. It costs 117 tokens per session (1,682 once invoked), scanned C, original, no licence file.

A guide to identifying the web server, software framework, application entry points, and related files used by a website. It uses clues such as HTTP headers, cookies, page metadata, robots.txt, source maps, and JavaScript.

In plain words
What is it for?
Use it during website reconnaissance to identify server versions, frameworks, application paths, source maps, and possible secrets in client-side code.
Why use it?
It helps reveal what technologies and exposed entry points may need closer security review.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the web plugin — 28 skills shipped together

not rated 21repo +1 7mo ago C scan 117 tokens no licence

Good fit Use it during website reconnaissance to identify server versions, frameworks, application paths, source maps, and possible secrets in client-side code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/securityfortech/hacking-skills/web-fingerprinting
View source ↗ securityfortech/hacking-skills
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 securityfortech/hacking-skills --skill web-fingerprinting
Clone the repo
git clone --depth 1 https://github.com/securityfortech/hacking-skills

Made for: Claude Code.

Or install web, the plugin that ships this one along with the rest of its 28 skills.

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 web-fingerprinting

README.md
[![agentmods](https://agentmods.dev/badge/skills/securityfortech/hacking-skills/web-fingerprinting/github.svg)](https://agentmods.dev/skills/securityfortech/hacking-skills/web-fingerprinting)
Your own site
<a href="https://agentmods.dev/skills/securityfortech/hacking-skills/web-fingerprinting"><img src="https://agentmods.dev/badge/skills/securityfortech/hacking-skills/web-fingerprinting/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 web-fingerprinting

Your own site · 80×15
<a href="https://agentmods.dev/skills/securityfortech/hacking-skills/web-fingerprinting"><img src="https://agentmods.dev/badge/skills/securityfortech/hacking-skills/web-fingerprinting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 117 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,682 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 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 $0.00117 $0.01682
Opus 5.5 $0.00047 $0.00673
Sonnet 5.5 $0.00023 $0.00336
Haiku 4.5 $0.00012 $0.00168

Measured 2mo ago against content hash 8ac3cca7e0e1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

web-fingerprinting scanned grade C 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 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -s http://TARGET/static/app.js.map | python3 -m json.tool | grep sources

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

compatibility: Designed for Claude Code. Requires curl, nikto, nmap, or Burp Suite.
skills/web/recon/web-fingerprinting/SKILL.md · 144 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 2mo ago First seen · 144 lines · 117 tokens per session scan C 8ac3cca7e0e1

Subscribe to this mod's changes

web-fingerprinting is a skill published in the GitHub repository securityfortech/hacking-skills (21 stars, last pushed 7mo ago), with no licence file. It adds 117 tokens to every session and 1,682 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Security
Related

web-fingerprinting compared with skills from other repositories

web-fingerprinting next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
web-fingerprintingsecurityfortech/hacking-skillsSkill217mo agononeC117Claude Code
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code