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yourvpndead-vpn-detection — Claude Code skill: how to install

Android security skill explaining how unprivileged apps detect active VPNs and open localhost SOCKS5 proxies without root.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add reason-machines/trending-skills --skill yourvpndead-vpn-detection -a claude-code
Open on GitHub

What yourvpndead-vpn-detection does

The skill provides Kotlin and Jetpack Compose patterns to audit network security on Android devices. It checks Android network capability flags, inspects system proxy properties, and evaluates MTU sizes below 1500 bytes to flag active tunnels.

Probing involves parsing /proc/net/tcp entries and running parallel TCP connection checks against localhost ports. Root access is not needed. These checks pinpoint exposed proxies from clients like v2rayNG or sing-box, which leak outbound gateway IPs.

The Android manifest must include INTERNET, ACCESS_NETWORK_STATE, and QUERY_ALL_PACKAGES. SELinux blocks procfs on newer Android builds.

What it helps with

  • detect active VPN tunnels via NetworkCapabilities and MTU checks
  • scan localhost for unauthenticated SOCKS5 proxies without root
  • fingerprint proxy clients like v2rayNG from open ports
  • retrieve external exit server details via exposed local APIs

Example prompts for the agent

  • Show Kotlin code to check for active VPNs using Android NetworkCapabilities
  • Write a coroutine-based port scanner for localhost SOCKS5 ports on Android
  • How can an Android app inspect MTU anomalies to flag tunnel interfaces?

How to install yourvpndead-vpn-detection

1Skills CLI (Vercel)

npx skills add reason-machines/trending-skills --skill yourvpndead-vpn-detection -a claude-code

2Manually: put the files in place

~/.claude/skills/yourvpndead-vpn-detection/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/yourvpndead-vpn-detection/

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about yourvpndead-vpn-detection

How to install yourvpndead-vpn-detection in Claude Code?

Run npx skills add reason-machines/trending-skills --skill yourvpndead-vpn-detection -a claude-code. The file is placed at ~/.claude/skills/yourvpndead-vpn-detection/SKILL.md.

Does this detection method require root access?

No, the inspection runs within a standard Android app context by opening localhost TCP sockets and querying network interfaces.

What Android permissions are needed for the scanner?

The app requires android.permission.INTERNET, android.permission.ACCESS_NETWORK_STATE, and android.permission.QUERY_ALL_PACKAGES.

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