# Install the "Linux VPS & Server Hardening" skill

You are installing an AgenticMarket skill into this workspace. Follow these steps exactly.

## 1. Detect your environment and choose the destination file
- Andromity: `.andromity/skills/linux-server-hardening/SKILL.md` (or user scope `~/.andromity/skills/linux-server-hardening/SKILL.md`)
- Antigravity / Gemini CLI: `.agent/skills/linux-server-hardening/SKILL.md`
- Cursor: `.cursor/rules/linux-server-hardening.mdc`
- Claude Code: append to `CLAUDE.md` (or `.claude/skills/linux-server-hardening.md`)
- Windsurf: append to `.windsurfrules`
- Cline / Roo Code: `.clinerules/linux-server-hardening.md`
- GitHub Copilot: append to `.github/copilot-instructions.md`
- ChatGPT / web only: paste the content into Custom Instructions
- Any other agent: save to `.agent/skills/linux-server-hardening/SKILL.md`

## 2. Create the destination file
- Preserve every existing file and configuration entry.
- Create parent folders as needed.
- Never overwrite unrelated content.

## 3. Write exactly this content

```markdown
---
name: linux-server-hardening
description: "Harden Ubuntu/Debian cloud servers with SSH key authentication, UFW firewall, fail2ban, and unattended upgrades."
author: community
license: mit
version: 1.0.0
---
# Linux Server Hardening

Production server security baseline:
1. Disable SSH password authentication and root login: `PasswordAuthentication no`, `PermitRootLogin no`.
2. Configure UFW firewall allowing only ports 22, 80, and 443.
3. Install and configure `fail2ban` to block brute-force attempts.
4. Enable automatic security updates with `unattended-upgrades`.
```

## 4. Verify
- Confirm the file exists and is readable.
- Report the destination path and confirm the "Linux VPS & Server Hardening" skill is installed and active.

Skill metadata:
- Slug: linux-server-hardening
- Category: security
- License: mit
- Source: AgenticMarket