Build a valid Claude skill (SKILL.md plus an upload-ready zip) by answering six plain-English questions. For people who paste the same instructions into an AI every week and bounced off the skill file format.

$7 once, yours to keep. Runs offline in your browser: no account, no AI key, no subscription.

Also part of the AI Builder Kit: Plainspoken, Blueprint, Skillsmith, Handoff and Promptbook together for $29 instead of $37.

Teach your AI a job once.

A skill is a small file that tells an AI how you want a job done: your weekly report, your brand voice, your meeting notes. Once it is installed the AI picks it up by itself whenever the job comes up. No more pasting the same instructions into every chat.

The catch is the format. It has a header with rules about names and lengths, and if the description is vague the skill never loads. Skillsmith handles all of that.

What it does

• Six plain-English questions: name, what and when, steps, rules, output format, example
• Writes a correctly formatted SKILL.md live as you type, with the header done properly
• Checker and 0 to 100 score: valid name, description length, third-person wording, enough trigger phrases, steps, rules, format, example, file length
• Download an upload-ready .zip (folder plus SKILL.md), the bare SKILL.md, or copy the text
• Five complete starter skills: weekly report, brand voice, meeting notes, email reply, spreadsheet cleanup
• Library of everything you have built, reopen and edit any time
• Install guide for Claude, for coding agents that read skills folders, and for ChatGPT, Gemini and others as pasted instructions
• A testing routine: three ways to ask, so you know it fires when it should and stays quiet when it should not
• Backup and restore

Who it's for

Anyone who retypes the same instructions to an AI every week, and anyone who has heard skills are powerful and bounced off the file format.

What you get

• Skillsmith (one .html file, runs in your browser, offline)
• A 2-page quick-start guide

Good to know

• Works with the AI you already use: ChatGPT, Claude, Gemini and the rest. There is no AI inside the app, so no API key, no credits and no monthly fee.
• One file. No install, no account, no subscription, no internet needed after download.
• Your data stays on your computer. Export a backup any time; import it on another machine.
• Built for a computer screen: Windows or Mac, in Chrome, Edge, Safari or Firefox.
• Instant download.

Need a custom app built for your business? I build native iOS apps and web tools from prototype to launch. Services and pricing · LinkedIn

Who made this

Matt Busel, AI Engineer @ Tensorust. I built 21 iOS apps from a Windows PC, a Steam game, and an AI agent team that runs my outreach in public, failures included.

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8 iOS apps live on the App Store (21 uploaded from Windows)

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5.4K LinkedIn followers

321+ newsletter subscribers

517 GitHub stars

Live things I built

• O'BLOCK on Steam (out Oct 20)
• Chain: Habit Tracker
• Ironbook: Workout Log
• Live receipts: what the agents did today
• Code on GitHub