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Agent skill

Pp Ucp

by mvanhorn in mvanhorn/printing-press-library

A Go CLI for Google's Universal Commerce Protocol — talk to UCP merchants over REST or MCP Trigger phrases: use ucp, run ucp, check this UCP store, search UCP merchant, add to my UCP cart, prep a…

Apache-2.0Auto-check: notes

Install Pp Ucp

skills CLI
$ npx skills add mvanhorn/printing-press-library --skill pp-ucp -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mvanhorn/printing-press-library pp-ucp --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mvanhorn/printing-press-library.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cli-skills/pp-ucp .claude/skills/pp-ucp && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
pp-ucp
GitHub stars
2.1k
Token cost
~2.4k tokens
SKILL.md length
1,009 words
Files
1
Skills in repo
506
Repo updated
First seen
Licence
Apache-2.0

At a glance

A Go CLI for Google's Universal Commerce Protocol — talk to UCP merchants over REST or MCP Trigger phrases: use ucp, run ucp, check this UCP store, search UCP merchant, add to my UCP cart, prep a…

  • Works in 3 steps: Install via the Printing Press… → Verify: ucp-pp-cli --version → Ensure the reported install directory is…
  • Phrases: use ucp
  • SKILL.md covers Prerequisites: Install the CLI, Real-Merchant Compatibility, When to Use This CLI and Unique Capabilities, plus 11 more sections
  • Calls go, claude and npx

What it does

Pp Ucp is an agent skill from mvanhorn/printing-press-library. A Go CLI for Google's Universal Commerce Protocol — talk to UCP merchants over REST or MCP Trigger phrases: use ucp, run ucp, check this UCP store, search UCP merchant, add to my UCP cart, prep a UCP checkout.

Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Model Context Protocol. The repository describes itself as: Official library of CLIs generated by the CLI Printing Press. Endorsed, tested, and community-contributed. The licence is Apache-2.0.

When your agent uses it

  • Phrases: use ucp
  • Check this UCP store
  • Search UCP merchant
  • Add to my UCP cart

Example prompts

  • “/pp-ucp”

Requirements

  • Node.js
  • Pre-approved tools (allowed-tools): Read, Bash

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Install via the Printing Press installer. It defaults binaries to $HOME/.local/bin on macOS/Linux and…
  2. Verify: ucp-pp-cli --version
  3. Ensure the reported install directory is on $PATH for the agent/runtime that will invoke this skill.

What it can do on your machine

Read from SKILL.md and the folder at commit 76de244. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Bash

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • go
    • claude
    • npx

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Pp Ucp loads about 2.4k tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 1,009 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~57
When it runs · the whole SKILL.md, loaded when a task matches
~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mvanhorn/printing-press-library at commit 76de244, republished under its Apache-2.0 licence (© mvanhorn). 1,009 words, ~2,373 tokens.

Download SKILL.mdSave it as .claude/skills/pp-ucp/SKILL.md (or your agent's skills folder).
name
pp-ucp
description
A Go CLI for Google's Universal Commerce Protocol — talk to UCP merchants over REST or MCP Trigger phrases: `use ucp`, `run ucp`, `check this UCP store`, `search UCP merchant`, `add to my UCP cart`, `prep a UCP checkout`.
allowed-tools
Read, Bash
author
david
license
Apache-2.0
argument-hint
<command> [args] | install cli|mcp
<!-- GENERATED FILE — DO NOT EDIT.
     This file is a verbatim mirror of library/commerce/ucp/SKILL.md,
     regenerated post-merge by tools/generate-skills/. Hand-edits here are
     silently overwritten on the next regen. Edit the library/ source instead.
     See the repository agent guide, section "Generated artifacts: registry.json, cli-skills/". -->

UCP — Printing Press CLI

Prerequisites: Install the CLI

This skill drives the ucp-pp-cli binary. You must verify the CLI is installed before invoking any command from this skill. If it is missing, install it first:

  1. Install via the Printing Press installer. It defaults binaries to $HOME/.local/bin on macOS/Linux and %LOCALAPPDATA%\Programs\PrintingPress\bin on Windows:
    bash
    npx -y @mvanhorn/printing-press-library install ucp --cli-only
  2. Verify: ucp-pp-cli --version
  3. Ensure the reported install directory is on $PATH for the agent/runtime that will invoke this skill.

If the npx install fails (no Node, offline, etc.), fall back to a direct Go install (requires Go 1.26.6 or newer):

bash
go install github.com/mvanhorn/printing-press-library/library/commerce/ucp/cmd/ucp-pp-cli@latest

If --version reports "command not found" after install, the runtime cannot see the binary directory on $PATH. Do not proceed with skill commands until verification succeeds.

Real-Merchant Compatibility

v0.1 supports two interaction patterns:

CommandReal merchants (e.g. checkout.coffeecircle.com)Bundled mock (mock serve)
check <domain>✅ Any merchant publishing /.well-known/ucp✅
search / cart / checkout prep⚠️ Requires REST transport — most public merchants are MCP-only (deferred to v0.2)✅ Full end-to-end flow

Known real merchants: checkout.coffeecircle.com (Shopify-hosted, MCP-only). v0.2 adds MCP transport client to unlock real-merchant transactions.

When to Use This CLI

Use ucp-pp-cli when an agent needs to interact with UCP merchants directly: probe a manifest, build a multi-merchant cart, run a search across known UCP-supporting stores, or prep a checkout draft for an AP2 mandate. It is the natural local pair to an AP2 CLI for the search-and-buy half of an agentic shopping flow. Skip it when you only need ChatGPT-side checkout (use an ACP-flavored tool) or when you only need merchant-side validation (use awesomeucp/ucp-doctor).

Unique Capabilities

These capabilities aren't available in any other tool for this API.

Cross-merchant discovery

  • check — Fetch /.well-known/ucp for any domain and return a graded report covering schema validity, advertised transports, and capability coverage — works against any merchant publishing a UCP manifest, including MCP-only Shopify-hosted stores.

    Lets an agent screen a domain for UCP viability without standing up an SDK or hand-rolling manifest parsing.

    bash
    ucp-pp-cli check checkout.coffeecircle.com --json
Reachability mitigation

  • mock serve — Spawn a UCP-compliant reference merchant locally (pure-Go, no external runtime) so ucp check, search, cart, and checkout prep flows work end-to-end without a third-party UCP merchant or extra language toolchains.

    Lets an agent verify its UCP integration without coordinating with a live merchant or waiting for Google AI Mode approval.

    bash
    ucp-pp-cli mock serve --port 8080

Command Reference

checkout — Operations on checkout

  • ucp-pp-cli checkout — POST /checkout
Finding the right command

When you know what you want to do but not which command does it, ask the CLI directly:

bash
ucp-pp-cli which "<capability in your own words>"

which resolves a natural-language capability query to the best matching command from this CLI's curated feature index. Exit code 0 means at least one match; exit code 2 means no confident match — fall back to --help or use a narrower query.

Recipes

Boot a UCP test environment from scratch
bash
ucp-pp-cli mock serve --port 8080

Start the bundled pure-Go reference merchant; then run check 127.0.0.1:8080 from another shell.

End-to-end search-to-checkout against the mock merchant
bash
ucp-pp-cli search "coffee" --merchant 127.0.0.1:8080 --json

Fan out a query, normalize results, and pipe the first product into cart add then checkout prep.

Validate a real public UCP merchant manifest
bash
ucp-pp-cli check checkout.coffeecircle.com --json

Probe a Shopify-hosted UCP merchant. Returns a graded report even though the merchant advertises MCP-only transport (REST-only commands won't transact against it in v0.1).

Auth Setup

UCP has no global API key. Each merchant declares its own auth shape; the CLI identifies itself via the UCP-Agent: profile="<url>" header and signs requests with a per-agent ECDSA-P256 key. Run ucp profile init once to generate your profile. For account-linked flows, ucp auth link <merchant> walks an OAuth 2.0 flow per merchant (v1: print-mode — agent pastes the redirect URL back).

Run ucp-pp-cli doctor to verify setup.

Show full SKILL.md (440 more words)Show less

Agent Mode

Add --agent to any command. Expands to: --json --compact --no-input --no-color --yes.

  • Pipeable — JSON on stdout, errors on stderr

  • Filterable — --select keeps a subset of fields. Dotted paths descend into nested structures; arrays traverse element-wise. Critical for keeping context small on verbose APIs:

    bash
    ucp-pp-cli checkout --agent --select id,name,status

  • Previewable — --dry-run shows the request without sending

  • Non-interactive — never prompts, every input is a flag

  • Explicit retries — use --idempotent only when an already-existing create should count as success

Agent Feedback

When you (or the agent) notice something off about this CLI, record it:

ucp-pp-cli feedback "the --since flag is inclusive but docs say exclusive"
ucp-pp-cli feedback --stdin < notes.txt
ucp-pp-cli feedback list --json --limit 10

Entries are stored locally at ~/.ucp-pp-cli/feedback.jsonl. They are never POSTed unless UCP_FEEDBACK_ENDPOINT is set AND either --send is passed or UCP_FEEDBACK_AUTO_SEND=true. Default behavior is local-only.

Write what surprised you, not a bug report. Short, specific, one line: that is the part that compounds.

Output Delivery

Every command accepts --deliver <sink>. The output goes to the named sink in addition to (or instead of) stdout, so agents can route command results without hand-piping. Three sinks are supported:

SinkEffect
stdoutDefault; write to stdout only
file:<path>Atomically write output to <path> (tmp + rename)
webhook:<url>POST the output body to the URL (application/json or application/x-ndjson when --compact)

Unknown schemes are refused with a structured error naming the supported set. Webhook failures return non-zero and log the URL + HTTP status on stderr.

Named Profiles

A profile is a saved set of flag values, reused across invocations. Use it when a scheduled agent calls the same command every run with the same configuration - HeyGen's "Beacon" pattern.

ucp-pp-cli profile save briefing --json
ucp-pp-cli --profile briefing checkout
ucp-pp-cli profile list --json
ucp-pp-cli profile show briefing
ucp-pp-cli profile delete briefing --yes

Explicit flags always win over profile values; profile values win over defaults. agent-context lists all available profiles under available_profiles so introspecting agents discover them at runtime.

Exit Codes

CodeMeaning
0Success
2Usage error (wrong arguments)
3Resource not found
4Authentication required
5API error (upstream issue)
7Rate limited (wait and retry)
10Config error

Argument Parsing

Parse $ARGUMENTS:

  1. Empty, help, or --help → show ucp-pp-cli --help output
  2. Starts with install → ends with mcp → MCP installation; otherwise → see Prerequisites above
  3. Anything else → Direct Use (execute as CLI command with --agent)

MCP Server Installation

  1. Install the MCP server:
    bash
    go install github.com/mvanhorn/printing-press-library/library/commerce/ucp/cmd/ucp-pp-mcp@latest
  2. Register with Claude Code:
    bash
    claude mcp add ucp-pp-mcp -- ucp-pp-mcp
  3. Verify: claude mcp list

Direct Use

  1. Check if installed: which ucp-pp-cli If not found, offer to install (see Prerequisites at the top of this skill).
  2. Match the user query to the best command from the Unique Capabilities and Command Reference above.
  3. Execute with the --agent flag:
    bash
    ucp-pp-cli <command> [subcommand] [args] --agent
  4. If ambiguous, drill into subcommand help: ucp-pp-cli <command> --help.

© mvanhorn, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in cli-skills/pp-ucp of mvanhorn/printing-press-library.

Open the folder on GitHubat commit 76de244

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Works with

Questions about Pp Ucp

What does Pp Ucp do?

A Go CLI for Google's Universal Commerce Protocol — talk to UCP merchants over REST or MCP Trigger phrases: use ucp, run ucp, check this UCP store, search UCP merchant, add to my UCP cart, prep a…. Pp Ucp is an agent skill from mvanhorn/printing-press-library. A Go CLI for Google's Universal Commerce Protocol — talk to UCP merchants over REST or MCP Trigger phrases: use ucp, run ucp, check this UCP store, search UCP merchant, add to my UCP cart, prep a UCP checkout.

When should I use Pp Ucp?

Pp Ucp fits situations like: phrases: use ucp; check this UCP store; search UCP merchant; add to my UCP cart.

How do I install Pp Ucp in Claude Code?

Run `npx skills add mvanhorn/printing-press-library --skill pp-ucp -a claude-code`. Or copy the skill folder (cli-skills/pp-ucp in mvanhorn/printing-press-library) into .claude/skills/pp-ucp in your project. Claude Code loads it when a task matches its description.

How do I install Pp Ucp in Codex?

Run `npx skills add mvanhorn/printing-press-library --skill pp-ucp -a codex`. Or copy the skill folder (cli-skills/pp-ucp in mvanhorn/printing-press-library) into .agents/skills/pp-ucp in your project. Codex loads it when a task matches its description.

Can I use Pp Ucp in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mvanhorn/printing-press-library --skill pp-ucp -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/pp-ucp, .gemini/skills/pp-ucp, .github/skills/pp-ucp and .opencode/skills/pp-ucp in your project.

What does Pp Ucp need to run?

Going by SKILL.md and its folder, Pp Ucp needs the command-line tools its instructions call (go, claude and npx). Our summary lists: Node.js. Its frontmatter pre-approves these tools: Read, Bash.

Does Pp Ucp access the network?

SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Pp Ucp safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Pp Ucp use?

Pp Ucp is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Pp Ucp use?

About 2.4k tokens (SKILL.md is roughly 9.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Pp Ucp?

Skills that share tags, products or a category with Pp Ucp: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Pp Ucp?

mvanhorn (a GitHub user) maintains it in mvanhorn/printing-press-library, which has 2,056 GitHub stars. The repository holds 506 skills in this directory. The repository was last updated on October 9, 2026.

Source: mvanhorn/printing-press-library on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.