ucp-checkout-a2a SKILL.md skillA
ucp-checkout-a2a 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-checkout-a2a@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-checkout-a2a/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260914.08f85a3, committed Sep 14, 2026
- First version recorded
- May 13, 2026
- Size
- 2,860 bytes
- Repository stars
- 40
- License
- MIT
Implement UCP Checkout over the A2A (Agent-to-Agent) binding — enable autonomous agent-to-agent commerce using Agent Cards and structured message parts. Use when building agent-to-agent commerce flows.
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 Checkout — A2A Binding ## Before writing code **Fetch live spec**: Web-search `site:ucp.dev specification checkout-a2a` and fetch the page for the exact message structure, DataPart keys, and Agent Card format. Also review Google's A2A protocol spec for the underlying transport: https://a2a-protocol.org/latest/specification/ ## Conceptual Architecture ### What is A2A? A2A (Agent-to-Agent) is a protocol for autonomous inter-agent communication. UCP's A2A binding lets a Platform agent talk to a Business agent using structured messages rather than REST calls. ### How It Works 1. **Discovery**: Business publishes an Agent Card at the URL declared in their `/.well-known/ucp` profile under `services.dev.ucp.shopping.a2a.endpoint`. 2. **Communication**: Platform sends messages with checkout data in `DataPart` objects. Business agent responds with checkout state in `DataPart` objects. 3. **Identification**: Platform includes `UCP-Agent` header and `X-A2A-Extensions` header referencing the UCP spec version. ### Key Data Part Keys | Key | Direction | Purpose | |-----|-----------|---------| | `a2a.ucp.checkout` | Both | Checkout session data | …
Read the whole file at its exact version.
How to install
mdr add orcaqubits/agentic-commerce-skills-plugins/ucp-checkout-a2a@sha256:e43906facbfb34d3The 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_deyzpvovgl75raz5)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between May 13, 2026 and Sep 14, 2026, about one every 125 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260914.08f85a3 latest | 2026-09-14 | 08f85a3 | 2,860 B | A | view · diff |
| git:20260513.084ea60 | 2026-05-13 | 084ea60 | 2,779 B | A | view |
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 (2860 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_deyzpvovgl75raz5 GET https://markdownregistry.com/api/v1/resolve?ref=orcaqubits/agentic-commerce-skills-plugins/ucp-checkout-a2a GET https://markdownregistry.com/api/v1/blob/e43906facbfb34d328c420d259cd5e9d26844197a34c33b100efd941e67c45ea
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.