ucp-cart SKILL.md skillA
ucp-cart from orcaqubits/agentic-commerce-skills-plugins is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add orcaqubits/agentic-commerce-skills-plugins/ucp-cart@git:20260914.08f85a3Pins git:20260914.08f85a3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- orcaqubits/agentic-commerce-skills-plugins
- Path
skills/ucp-cart/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260914.08f85a3, committed Sep 14, 2026
- Size
- 3,944 bytes
- Repository stars
- 40
- License
- MIT
Implement the UCP Cart capability (`dev.ucp.shopping.cart`) — a lightweight CRUD surface for collecting line items before purchase intent exists, and its conversion into a Checkout session. Use when building pre-checkout item collection, shareable carts, or cart-recovery flows over REST, MCP, or Embedded bindings.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# UCP Cart Capability ## Before writing code **Fetch live spec**: Web-search `site:ucp.dev specification shopping cart` and fetch the page for the exact Cart schema, operation names, and binding details. Also fetch `https://ucp.dev/latest/schemas/shopping/cart.json` for the authoritative JSON Schema. Field names and required-ness change between spec versions — never write the schema from memory. ## Conceptual Architecture ### Why Cart is separate from Checkout Checkout carries payment handler configuration, buyer commitment, and a status lifecycle. That is overhead a buyer does not need while still browsing. Cart is the lightweight half: collect items, get estimated totals, share a link — with **no payment configuration and no status machine**. The canonical progression is: ``` cart session → checkout session → order ``` Cart handles *exploration*. Checkout enforces *commitment*. ### Operations | Operation | Purpose | |-----------|---------| | Create Cart | Initialize a session with line items and optional buyer / context data | | Get Cart | Read current state; returns `not_found` once expired or cancelled | …
Read the whole file at its exact version.
How to install
mdr add orcaqubits/agentic-commerce-skills-plugins/ucp-cart@sha256:d24539a4a399038eThe line at the top of this page pins the label git:20260914.08f85a3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_bwuljo5yiivjlz7z)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 14, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3944 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
orcaqubits/agentic-commerce-skills-plugins · 40 stars · license MIT · pushed 2026-09-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bwuljo5yiivjlz7z GET https://markdownregistry.com/api/v1/resolve?ref=orcaqubits/agentic-commerce-skills-plugins/ucp-cart GET https://markdownregistry.com/api/v1/blob/d24539a4a399038ebe35bf62cf739ebbdccfb6bde5b3e2a0d2980eeeb7689348
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.