Injection Spotter

Q: What is a Claude Code skill and how does the Injection Spotter 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. Injection Spotter 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: security-misc · Last updated: 2026-07-23

Spot prompt-injection in untrusted content before an agent acts on it — the anatomy of injected instructions across the channels attackers use (email, web, files, tool outputs, documents), the tell-list, and the safe-handling response. Use when asked is this content trying to hijack my agent, check this page or email or file for prompt injection, spot the injection, or why did my agent go off-task. Produces the injection verdict with quoted tells, the channel-specific patterns, and the safe-handling protocol.

Security BStatic scan: minor findingsHow grading works ›

From the source SKILL.md

Prompt injection is the SQL injection of the agent era: untrusted content — an email body, a web page, a file, a tool's output, a document — carries instructions aimed not at the human but at the agent reading it, hijacking it into exfiltrating data, taking unauthorized actions, or abandoning its task. This skill reads suspect content the way a security reviewer does: against the anatomy of injection (the imperative aimed at the AI, the authority claim, the instruction to ignore prior rules, the request to act or reveal), quotes the tells from the content itself, and prescribes the safe…

What this skill does

Injection Spotter is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/injection-spotter/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when asked is this content trying to hijack my agent, check this page or email or file for prompt injection, spot the injection, or why did my agent go off-task. Produces the injection verdict with quoted tells, the channel-specific patterns, and the safe-handling protocol.

Who uses this skill

The Injection Spotter 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 174,000+ 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/injection-spotter
curl -L https://claudskills.com/skills/injection-spotter/SKILL.md \
  -o ~/.claude/skills/injection-spotter/SKILL.md

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

Skills live at ~/.claude/skills/injection-spotter/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\injection-spotter\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 Injection Spotter Claude Code skill?

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

What does the Injection Spotter 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 Injection Spotter skill?

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

What is a Claude Code skill and how does the Injection Spotter 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. Injection Spotter 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/mohitagw15856/pm-claude-skills/blob/HEAD/exports/openclaw/injection-spotter/SKILL.md
License: MIT
Author: mohitagw15856
Website: https://mohitagw15856.github.io/pm-claude-skills/

Cite this skill

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

APA

mohitagw15856. (2026). Injection Spotter [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/injection-spotter/

BibTeX

@misc{injection-spotter-2026,
  author    = {mohitagw15856},
  title     = {Injection Spotter [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/injection-spotter/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/injection-spotter.svg)](https://claudskills.com/skills/injection-spotter/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade B · scanned 2026-08-02 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (prompt-injection), including a critical-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

⚠ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: B](https://img.shields.io/badge/Security-B-558b2f)](https://claudskills.com/skills/injection-spotter/#security)

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Browse all Security skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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