Guide · Agent skill
How to use the System Administration Expert agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The sysadmin skill is a set of instructions that makes an AI agent behave like a careful system administration helper for Linux, macOS and Windows. It is aimed at developers and IT staff who look after a small server or workstation, and at people learning administration who want the reasons behind each command. After this guide you will know how to install the skill, how to ask for help in plain language, and which safety limits to keep in mind.
System Administration ExpertRightNow-AI/openfang · Apache-2.0 Download the skill Quick start
- 1Download the ZIP. Get the sysadmin ZIP from the item page on this directory.
- 2Unzip the folder. Extract the archive so that the folder containing SKILL.md is ready to copy.
- 3Place the skill. Copy the folder into ~/.claude/skills/ for personal use or into .claude/skills/ inside a project.
- 4Or upload it in the apps. In the Claude apps, go to Settings → Capabilities → Skills and upload the ZIP.
- 5Describe your problem. Ask in plain language, naming the symptom and your operating system if you know it.
- 6Run diagnostics first. Run the read-only commands the agent suggests and check the output before making any change.
- 7Back up and verify. Back up any config file before editing it, then check service status and logs after the change.
What the sysadmin skill makes the agent do
Agent skills are folders of instructions that an AI agent loads when a task matches them. This one is a single file, SKILL.md, that tells the agent to act as a system administration specialist for servers, services, troubleshooting and maintenance.
Once the skill is active, the agent first identifies your operating system and version, because command syntax differs between distributions and platforms. It then prefers read-only diagnostic commands and explains why each one is useful. The skill only provides instructions and commands in the conversation; the file itself does not run anything on your machine.
- Checks the operating system and version before suggesting commands
- Suggests non-destructive diagnostics before any change
- Explains the reason behind each command
- Gives guidance on service management, logs and basic security hardening
- Warns against risky habits such as chmod 777 and editing sudoers directly
How to install the sysadmin skill
You can install the skill for yourself or for a single project. Download the ZIP from the item page and unzip it. The folder containing SKILL.md goes into one of these locations:
- Personal: ~/.claude/skills/ so it is available in all your projects
- Project: .claude/skills/ inside a specific project folder
- Claude apps: upload the ZIP under Settings → Capabilities → Skills
~/.claude/skills/How to trigger the skill with natural requests
You do not need a special command. Describe the problem in ordinary words and mention your system if you know it. The agent will ask for the operating system if it needs it.
Good requests name the symptom, the machine and what you have already tried. Vague requests get more questions back, which is also fine.
- My Ubuntu server's disk is almost full. What should I check first?
- Nginx failed to start after a reboot. How do I see why?
- My Mac is slow and the fan is loud. Which diagnostics should I run?
- Help me find which services are listening on ports on this Windows PC.
Examples of diagnostics the skill covers
The skill's reference material lists commands for each platform. For a full disk on Linux it points to df -h to see which filesystem is full, du -sh * to see which folders are large, and lsblk to view the disk layout. For a failing service on a systemd machine it points to systemctl list-units --failed and to journalctl -u with a service name and a time window.
Before editing any config file, the skill asks you to back up the file first, using a dated copy such as cp file file.bak.YYYYMMDD.
- Disk: df -h, du -sh *, lsblk (Linux); diskutil list (macOS); Get-Volume (Windows)
- CPU and memory: top, htop, vmstat, free -h (Linux); Activity Monitor or vm_stat (macOS); Get-Process (Windows)
- Logs: journalctl -u service-name --since "1 hour ago", tail -f /var/log/syslog, dmesg
- Network: ss -tlnp or netstat -tlnp, ip addr, ping, traceroute, dig, curl -v
journalctl -u service-name --since "1 hour ago"Security hardening and habits the skill warns about
The skill covers common hardening steps: disabling root SSH login, using key-based authentication, allowing only necessary ports with ufw or iptables/nftables, keeping systems updated, using fail2ban against brute-force attacks, and auditing listening services with ss -tlnp.
It also lists habits to avoid. It warns against chmod -R 777, against editing /etc/sudoers directly (use visudo instead), against kill -9 before trying SIGTERM, against piping untrusted scripts from the internet straight into a shell, and against disabling SELinux or AppArmor to get past a permission problem.
- Use visudo rather than editing /etc/sudoers
- Try SIGTERM before kill -9
- Read scripts before running them
- Investigate SELinux or AppArmor policy instead of disabling it
What you need and what the skill does not do
The skill lists no required tools, does not run scripts and does not use the network. You still need a machine where you can run the commands the agent suggests, and an account with the permissions for any change you make.
The guidance is general. Commands can be wrong for your exact distribution or version, so check them against your system's documentation before running them on anything important.
- Requires: nothing listed
- Runs scripts: no
- Uses network: no
What people use it for
- Finding out why a systemd service failed to start, using journalctl and systemctl status
- Tracking down a full disk on a Linux server with df and du
- Reviewing which ports are open with ss -tlnp before tightening a firewall
- Getting a second opinion on a command before running it on a workstation
- Learning what each diagnostic command shows on Linux, macOS or Windows
Frequently asked questions
How do I install the sysadmin agent skill?
Download the ZIP from the item page and unzip it. Copy the folder containing SKILL.md into ~/.claude/skills/ for personal use or into .claude/skills/ in a project, or upload the ZIP under Settings → Capabilities → Skills in the Claude apps.
Does the sysadmin skill require anything else to be installed?
The skill lists no required dependencies. It is a set of instructions, so you need a machine where you can run the commands the agent suggests and the permissions to make any changes.
Is the sysadmin skill free and what is its licence?
The item is listed under the Apache-2.0 licence. Check the repository's licence file for the full terms before reuse.
Does the skill run commands on my computer?
No. The skill file does not run anything. It provides instructions and commands in the conversation, and you decide whether to run them.
Can the sysadmin skill break my server?
It is designed to suggest read-only diagnostics first and to warn against destructive habits, but its commands can still be wrong for your distribution or version. Test on a non-critical system and keep backups before changing anything live.
How does this compare with just asking a chatbot about Linux?
The skill adds a consistent structure: it checks your OS first, starts with non-destructive commands, explains each one and includes a fixed list of pitfalls to avoid. A general chat may not follow those steps unless you ask for them.
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Our verdict
This skill suits developers and IT staff who manage a small server or workstation and want a careful second opinion on commands, and learners who want explanations alongside them. It is not a substitute for review before production changes, for a security audit, or for non-technical users who would run commands they do not understand on important data.
Download the skill