Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/shopify/ucp-cli/ucpnpx skills add Shopify/ucp-cli --skill ucpgit clone --depth 1 https://github.com/Shopify/ucp-cliWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00090 | $0.07542 |
| Opus 5 | $0.00045 | $0.03771 |
| Sonnet 5 | $0.00018 | $0.01508 |
| Haiku 4.5 | $0.00009 | $0.00754 |
Grade B, and why
ucp scanned grade B with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
export UCP_ON_ESCALATION='curl -sX POST -H "Content-Type: application/json" --data @- "$WEBHOOK_URL"' Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
export UCP_ON_ESCALATION='curl -sX POST -H "Content-Type: application/json" --data @- "$WEBHOOK_URL"' How it starts
The opening of the file, as written. The whole thing — 349 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ucp
When a buyer expresses commercial intent — wanting to find, buy, or track products — this is your toolkit. You can search across thousands of merchants via a bundled global catalog, build carts and complete checkouts against any UCP-supporting merchant, and follow up on orders. For merchants that don't support direct transactions, hand off gracefully to the merchant's own flow.
Setup: Run
ucp profile init --name agentat the start of any session. It's idempotent — re-running with an existing profile no-ops (created: false, exit 0) — so call it unconditionally rather than checking state first. This creates the local CLI identity required for all UCP operations; it's not a merchant onboarding step or a Catalog API key. Seereferences/SETUP.mdfor installation paths anducp doctor.
How to decide what to do
| Buyer says... | Do this |
|---|---|
| "Find me X", "I need X for Y", "what's a good X under $Z" — no merchant named | ucp catalog search against the global catalog. Each result names its merchant via seller.domain. |
| "Show me this" — buyer pastes a product/variant link or wants a specific product's full PDP/options matrix | ucp catalog get_product <product_id> — single call, returns result.product (singular). Omit --business for global Catalog IDs. |
| "Are these still available?" — refreshing prices/stock/validity for known IDs (saved lists, wish lists, stale carts) | ucp catalog lookup with the IDs (up to 50). To distinguish OOS from delisted, pass filters.available: false — the default filters to in-stock only, so OOS and delisted both look like absence. |
| "Buy this from <merchant>" — buyer names a specific merchant | ucp discover --business <url> first; if it succeeds, transact via --business <url>. If it fails, the merchant doesn't speak UCP — tell the buyer and offer alternatives. |
| "Track my order" | ucp order get <order_id> --business <url> |
Rule of thumb: broad product discovery → global catalog (no --business needed). Business-scoped operations — cart, checkout, order, or catalog scoped to a specific merchant — → pass --business <url>. Reach for one or the other based on the buyer's intent.
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 349 lines · 90 tokens per session scan B 5985056f3fcb
ucp is a skill published in the GitHub repository Shopify/ucp-cli (67 stars, last pushed 10d ago), licensed MIT. It adds 90 tokens to every session and 7,542 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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