Fingerprinting Server Software

Q: What is a Claude Code skill and how does the Fingerprinting Server Software skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Fingerprinting Server Software is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: web-security · Last updated: 2026-06-01

type:audit type:generator

Identify the server software, framework, and component versions a target is running from its HTTP response signatures — Server header, X-Powered-By, Via, X-AspNet-Version, X-Runtime, X-Drupal-Cache, X-Generator, Set-Cookie name patterns, error-page artwork, HTTP method behavior signatures. Use when: penetration test reconnaissance phase, post-deploy audit of fingerprintable exposure, or before reporting "no obvious version disclosure" to an auditor. Threshold: any version string in a response header (e.g., Server header with nginx/1.18.0, X-Powered-By with PHP/7.4.21, X-Generator with Drupal 9), or any framework-default Set-Cookie name (PHPSESSID, JSESSIONID, connect.sid, _csrf_token). Trigger with: "fingerprint server", "version disclosure", "tech-stack identification", "what's this site running".

About this skill (catalog notes)

Fingerprinting Server Software includes a dedicated installation section; worked examples; 6 code blocks for direct copy-paste. The SKILL.md runs to about 800 words, in the catalog's typical mid-range.

Source: tonsofskills.com
License: MIT
Original author: Jeremy Longshore <[email protected]>
Indexed lastmod: 2026-06-01
Catalog position: Security · web-security
Indexed related skills: 10

How Fingerprinting Server Software fits the catalog

Fingerprinting Server Software sits in the Security category under the web-security sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

What this skill does

Fingerprinting Server Software is a community-contributed Claude Code skill in the web-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/fingerprinting-server-software/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when: penetration test reconnaissance phase, post-deploy audit of fingerprintable exposure, or before reporting "no obvious version disclosure" to an auditor. Threshold: any version string in a response header (e.

Who uses this skill

The Fingerprinting Server Software Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 92,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/fingerprinting-server-software
curl -L https://claudskills.com/skills/fingerprinting-server-software/SKILL.md \
  -o ~/.claude/skills/fingerprinting-server-software/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/fingerprinting-server-software/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/fingerprinting-server-software/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\fingerprinting-server-software\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Fingerprinting Server Software Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/fingerprinting-server-software/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Fingerprinting Server Software skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Fingerprinting Server Software skill?

Use Fingerprinting Server Software when your Claude Code task falls under the Security category — specifically in the web security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Fingerprinting Server Software" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Fingerprinting Server Software skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Fingerprinting Server Software is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/HEAD/plugins/security/penetration-tester/skills/fingerprinting-server-software/SKILL.md
License: MIT
Author: Jeremy Longshore <[email protected]>
Website: https://tonsofskills.com

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

Jeremy Longshore <[email protected]>. (2026). Fingerprinting Server Software [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/fingerprinting-server-software/

BibTeX

@misc{fingerprinting-server-software-2026,
  author    = {Jeremy Longshore <[email protected]>},
  title     = {Fingerprinting Server Software [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/fingerprinting-server-software/}
}

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Badge

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