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.
npx skills add SecurityTalent/bugskill-ai --skill web-fingerprintinggit clone --depth 1 https://github.com/SecurityTalent/bugskill-aiWrote 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.
[](https://agentmods.dev/skills/securitytalent/bugskill-ai/web-fingerprinting)<a href="https://agentmods.dev/skills/securitytalent/bugskill-ai/web-fingerprinting"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/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.
<a href="https://agentmods.dev/skills/securitytalent/bugskill-ai/web-fingerprinting"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/web-fingerprinting.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00117 | $0.01682 |
| Opus 5.5 | $0.00047 | $0.00673 |
| Sonnet 5.5 | $0.00023 | $0.00336 |
| Haiku 4.5 | $0.00012 | $0.00168 |
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 20d 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. How it starts
The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Fingerprinting and Information Gathering
What Is Broken and Why
Web applications leak technology stack details through HTTP response headers, HTML comments, cookie names, error messages, and static file paths. Search engines and archives may index sensitive configuration files, credentials, and internal network diagrams. Collectively this intelligence narrows an attacker's target surface dramatically before any active exploitation begins, enabling precise selection of known CVEs for the identified stack.
Key Signals
Server:header reveals product and version (e.g.,Apache/2.4.41,nginx/1.17.3)X-Powered-By:orX-Generator:headers expose backend language/framework- Framework-specific cookies:
CAKEPHP,laravel_session,wp-settings,fe_typo_user - HTML
<meta name="generator">tags (WordPress, Joomla, Drupal) - Accessible paths:
/wp-admin/,/wp-content/,/wp-includes/ - HTML comments embedding SQL queries, credentials, or internal IPs
- JS files with hardcoded API keys, DB connection strings, AWS credentials
.mapsource map files exposing full source trees and internal file pathsrobots.txtDisallow entries revealing hidden paths- Error responses leaking stack traces, framework names, file paths
__VIEWSTATEin forms = ASP.NET;<!-- ZK= ZK framework;.cfm= ColdFusion
Methodology
- Passive recon: Run Google dorks against the target domain using
site:,inurl:,filetype:,intitle:,intext:operators. Check Internet Archive Wayback Machine and Shodan. - Banner grabbing: Send raw HTTP/HTTPS requests and record
Server:,X-Powered-By:,ETag, header ordering, and error page footers. - Malformed request probing: Send invalid HTTP version strings to trigger version-revealing error pages.
- Cookie analysis: Capture
Set-Cookieheaders across all application sections; match names against known framework signatures. - HTML/JS source review: Spider the application, download all
.jsfiles, search for credentials patterns, internal hostnames, API endpoints. - Source map detection: Append
.mapto discovered JS filenames; if 200 OK, parsesourcesarray for internal paths. - Entry point mapping: Use intercepting proxy to record all GET/POST parameters, hidden fields, custom headers, and WebSocket frames.
- Dirbusting: Request framework-specific paths identified in step 4; compare HTTP response codes to confirm technology.
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.
- 20d ago First seen · 144 lines · 117 tokens per session scan C 8ac3cca7e0e1
web-fingerprinting is a skill published in the GitHub repository SecurityTalent/bugskill-ai (13 stars, last pushed 21d ago), licensed MIT. 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 2026-09-27.
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