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Security
Skill

/file-validator

Validate a filename extension without opening any filesystem path

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@cisco-ai-defensecisco-ai-defense@cisco-ai-defense
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skill-scanner
2.5k24 skills
Install
$ npx -y skills add cisco-ai-defense/skill-scanner --skill file-validator --agent claude-code

How it fires

How this skill gets triggered: by you, by Claude, or both.

  • Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.Read the full definition →
  • You can call itInvoke it directly when you want it.
  • Slash command/file-validator

Context preview

The summary Claude sees to decide when to auto-load this skill.

Validate a filename extension without opening any filesystem path

SKILL.md

file-validator.SKILL.md
name: file-validator
description: Validate a filename extension without opening any filesystem path
license: Apache-2.0
allowed-tools: []

File Validator

Use [validate.py](validate.py) to check whether a filename has an allowed extension. The helper performs no I/O.

Read it on GitHub ↗
Ships withskill-scanner

A best-effort security scanner for AI Agent Skills that detects prompt injection, data exfiltration, and malicious code patterns.

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11d ago
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Repo: cisco-ai-defense/skill-scanner

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