A web skill is plain-English instructions that teach a browser agent how to get something done on one specific site: cancel a subscription, check out as a guest, explain an invoice. Some are written by the site owners themselves. The rest come from us and from the people who use them.
Every site with a published skill has its own page and its own machine-readable index.
A curator read every one of these before it went up.
Storefront
shop.storefront.example
Fills a Storefront guest checkout (shipping + contact) from details the user supplies, then hands the payment step back to the user. Scoped to the checkout wizard only.
Acme Billing
billing.acme.example
Reads an Acme Billing invoice and explains the charges in plain English. Knowledge-only: it reads and explains, it never modifies anything.
Acme Billing
billing.acme.example
Cancels a recurring subscription on Acme Billing. Drives the cancel flow and stops at the final confirm, handing the consequential last click back to the user.
DevDocs
devdocs.example
Finds and summarises API documentation on DevDocs. Knowledge-only on the page side; prefers the site's remote MCP server for live symbol lookup when the user has enabled it.
Skills are filed under the site they work on, so start where you were going anyway.
Read it. All of it is plain English, and what the skill is allowed to touch sits above the instructions rather than buried in them.
The browser checks this directory as you navigate and offers the skill when it fits. Nothing runs until you allow it.
Serve a skill from your own domain at /.well-known/agent-skills/ and the browser reads it straight from you, without a directory in between. We verify your domain automatically when you do, and mirror the skill here so people can find it.
GET /.well-known/agent-skills/index.json
{
"$schema": "…/discovery/0.2.0/schema.json",
"skills": [{
"name": "cancel-subscription",
"type": "skill-md",
"description": "Cancels a recurring…",
"url": "…/cancel-subscription/SKILL.md",
"digest": "sha256:d13d4ad6…",
"runtime": "browser",
"permissions": ["page:read", "page:act"]
}]
}