ClaudSkills / Security / network-security

Prompt Firewall Patterns

Q: What is a Claude Code skill and how does the Prompt Firewall Patterns 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. Prompt Firewall Patterns 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: network-security · Last updated: 2026-06-04

ai:llm

Build cognitive security firewalls against prompt injection, jailbreak attacks, and Unicode homoglyph smuggling. Instruction-data segregation, jailbreak token filtering, LLM-as-a-Judge semantic guard, and system prompt reinforcement.

About this skill (catalog notes)

Prompt Firewall Patterns includes explicit scope boundaries (an explicit 'when not to use' or 'out of scope' section); 5 code blocks for direct copy-paste. The SKILL.md is on the shorter side at about 499 words.

Original author: phamlongh230-lgtm
Indexed lastmod: 2026-06-04
Catalog position: Security · network-security
Indexed related skills: 10

How Prompt Firewall Patterns fits the catalog

Prompt Firewall Patterns sits in the Security category under the network-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.

From the source SKILL.md

Stop attacks that arrive as natural language: prompt injection, jailbreaks, Unicode tricks, and adversarial perturbations.

What this skill does

Prompt Firewall Patterns is a community-contributed Claude Code skill in the network-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/prompt-firewall-patterns/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Prompt Firewall Patterns 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 117,000+ 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/prompt-firewall-patterns
curl -L https://claudskills.com/skills/prompt-firewall-patterns/SKILL.md \
  -o ~/.claude/skills/prompt-firewall-patterns/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/prompt-firewall-patterns/. Claude Code auto-discovers it on next session.

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

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

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 Prompt Firewall Patterns Claude Code skill?

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

What does the Prompt Firewall Patterns 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 Prompt Firewall Patterns skill?

Use Prompt Firewall Patterns when your Claude Code task falls under the Security category — specifically in the network 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 Prompt Firewall Patterns" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Prompt Firewall Patterns 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. Prompt Firewall Patterns 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/phamlongh230-lgtm/yamtam-engine/blob/HEAD/.claude/skills/prompt-firewall-patterns/SKILL.md
Author: phamlongh230-lgtm

Cite this skill

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

APA

phamlongh230-lgtm. (2026). Prompt Firewall Patterns [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/prompt-firewall-patterns/

BibTeX

@misc{prompt-firewall-patterns-2026,
  author    = {phamlongh230-lgtm},
  title     = {Prompt Firewall Patterns [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/prompt-firewall-patterns/}
}

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