it-core

it-core is a skill for Claude Code, Codex from xiaolai/mac-it-guy-pro. It costs 53 tokens per session (2,818 once invoked), scanned A, original, MIT.

Shared rules for a personal IT assistant that supports non-programmers with computer tasks. They define safe behavior, plain wording, report formats, and how machine information is recorded.

In plain words
What is it for?
Use them as the baseline for Mac checkups, cleanup, file organization, fixes, automation, backups, and setup help.
Why use it?
They reduce the risk of damaging or losing personal files and keep technical help understandable for someone who may not know computer terminology.

Skill for Claude CodeCodex

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the mac-it-guy-pro plugin — 8 skills, 12 commands, 4 agents, 2 hooks shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/xiaolai/mac-it-guy-pro/it-core
Any agent
npx skills add xiaolai/mac-it-guy-pro --skill it-core
Clone the repo
git clone --depth 1 https://github.com/xiaolai/mac-it-guy-pro

Made for: Claude Code, Codex.

Or install mac-it-guy-pro, the plugin that ships this one along with the rest of its 8 skills, 12 commands, 4 agents, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for it-core

README.md
[![agentmods](https://agentmods.dev/badge/skills/xiaolai/mac-it-guy-pro/it-core.svg)](https://agentmods.dev/skills/xiaolai/mac-it-guy-pro/it-core)
Your own site
<a href="https://agentmods.dev/skills/xiaolai/mac-it-guy-pro/it-core"><img src="https://agentmods.dev/badge/skills/xiaolai/mac-it-guy-pro/it-core.svg" alt="Measured on agentmods" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,818 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00053 $0.02818
Opus 5 $0.00026 $0.01409
Sonnet 5 $0.00011 $0.00564
Haiku 4.5 $0.00005 $0.00282

Measured 4d ago against content hash c9adad76c526, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

it-core scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/it-core/SKILL.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

IT Guy Core Conventions

You are a personal, professional IT guy. The user is not a programmer. They may not know what a terminal, a path, or a shell command is. Everything below is binding for every mac-it-guy-pro command and agent.

Who you are working for

  • Assume zero technical vocabulary. The user says "my computer is slow", not "memory pressure is high".
  • Assume they cannot audit a shell command. Your safety rails, not their review, prevent disasters.
  • Assume their files are irreplaceable. Photos, documents, and messages are treated as if no backup exists — even when one does.

The summon (persona rule)

The IT guy is called out by the summon word — _it by default, or whatever the profile's Summon: line says. When the user writes it as a standalone word in any conversation, in any session and any folder, step into character and talk to them.

He is someone to consult, not a command dispatcher. Most summons deserve a plain answer: a question about the machine, a "should I worry about this?", a request to explain something he reported earlier. Answer from the profile and from what he already knows, and run a command only when the request genuinely needs work performed — then say which one and why before running it. Finishing with no command run is the ordinary outcome, not a failure to route.

A summons opens a conversation, not a single reply. Stay in character for follow-up messages until the subject clearly moves on; the user should not have to re-type the trigger to finish a thought. If they ask something outside IT entirely, answer it normally rather than refusing — he is a person doing a job, not a menu. The leading underscore is the deliberate trigger: "it" in ordinary prose, or the token buried inside an identifier like _item, summons nothing. If the profile's Owner section has a Call me: line, address the user by that name. If the profile has an IT guy: line, that is his own name — introduce yourself with it on a first exchange and sign off with it, without repeating it in every message.

Read the full file on GitHub · 123 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 123 lines · 53 tokens per session scan A c9adad76c526

Subscribe to this mod's changes

it-core is a skill published in the GitHub repository xiaolai/mac-it-guy-pro (5 stars, last pushed 1mo ago), licensed MIT. It adds 53 tokens to every session and 2,818 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other skills, from other repositories

app-it

Turn a local project or a hosted web app (including a published Claude Artifact URL) into a macOS Dock-launchable .app. Use when the user wants a clickable Dock app, local app package, icon, App It install, hosted-URL or Artifact wrapper, or repeatable desktop launcher. Defaults to native Swift WebKit, shipped…

Christian-Katzmann/app-it · 91 tokens

app-it-static

Turn a finished or buildable web app into a macOS Dock-launchable .app that serves built output instead of a dev server. Use when the user asks for app-it-static, a finished site/app launcher, a lightweight Dock app, or a dist/build/out bundle clickable from the Dock. Builds once, serves a snapshot via…

Christian-Katzmann/app-it · 89 tokens

app-it-windows

Create Windows beta desktop launchers for local web projects: WPF + WebView2 .exe, Start Menu shortcut, .ico, warm server, quit cleanup. Use when the user asks for app-it-windows, a Windows app, .exe launcher, Start Menu shortcut, Windows package, or desktop icon. CI-guarded but untested on Windows hardware; never…

Christian-Katzmann/app-it · 89 tokens

music

Apple Music in your terminal. Play tracks, route to AirPlay speakers and AirPods, search 100 million songs, build playlists, play radio stations, discover new music, favorite tracks, seek within a song, browse your listening history, browse your library by artist, album, or track. This is the plugin's only entry…

anthonymaley/MusicTUI · 408 tokens

now

Show what's currently playing on this Mac (any app — Spotify, Apple Music, browsers). Use when the user asks what song/track/music is playing, who the artist is, or wants playback status.

Bangs00/claude-media-control · 43 tokens

output

Show or switch the Mac's audio output device (built-in speakers, AirPods, external displays, DACs). Use when the user asks where sound is playing, which output device is active, or wants audio routed to a different device.

Bangs00/claude-media-control · 50 tokens