Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/dragnoir/Shopify-agent-skillsnpx agentmods add skills/dragnoir/shopify-agent-skills/shopify-functionsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dragnoir/shopify-agent-skills/shopify-functions)<a href="https://agentmods.dev/skills/dragnoir/shopify-agent-skills/shopify-functions"><img src="https://agentmods.dev/badge/skills/dragnoir/shopify-agent-skills/shopify-functions/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dragnoir/shopify-agent-skills/shopify-functions"><img src="https://agentmods.dev/badge/skills/dragnoir/shopify-agent-skills/shopify-functions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00050 | $0.02987 |
| Opus 5 | $0.00025 | $0.01494 |
| Sonnet 5 | $0.00010 | $0.00597 |
| Haiku 4.5 | $0.00005 | $0.00299 |
Grade A, and why
shopify-functions scanned grade A with 0 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 11d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 532 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Shopify Functions
When to use this skill
Use this skill when:
- Creating custom discount logic
- Customizing delivery options
- Implementing payment method rules
- Validating cart or checkout
- Building order routing logic
- Extending Shopify's backend behavior
What are Shopify Functions?
Functions are serverless WebAssembly modules that extend Shopify's backend logic. They:
- Run on Shopify's infrastructure
- Execute in milliseconds
- Scale automatically
- Are upgrade-safe
Function Types
| API | Purpose |
|---|---|
| Discounts | Product, order, and shipping discounts |
| Delivery Customization | Rename, reorder, hide shipping options |
| Payment Customization | Filter, reorder payment methods |
| Cart & Checkout Validation | Block checkout with errors |
| Order Routing | Control fulfillment locations |
| Cart Transform | Modify cart contents |
Getting Started
1. Create a Function
# In an existing app
shopify app generate extension
# Select from function types:
# - Delivery customization
# - Product discount
# - Order discount
# - Cart & Checkout Validation
# - etc.
2. Choose a Language
Rust (Recommended) - Best performance, handles large carts
JavaScript - Easier to learn, good for simpler logic
3. Function Structure
extensions/
└── my-discount/
├── src/
│ └── run.rs (or run.js)
├── input.graphql
├── shopify.extension.toml
└── Cargo.toml (for Rust)
Function Anatomy
Configuration (shopify.extension.toml)
api_version = "2025-01"
[[extensions]]
name = "Volume Discount"
handle = "volume-discount"
type = "function"
[[extensions.targeting]]
target = "purchase.product-discount.run"
input_query = "src/run.graphql"
export = "run"
[extensions.build]
command = "cargo wasi build --release"
path = "target/wasm32-wasi/release/volume-discount.wasm"
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.
- 11d ago First seen · 532 lines · 50 tokens per session scan A 1ca764da594e
shopify-functions is a skill published in the GitHub repository dragnoir/Shopify-agent-skills (48 stars, last pushed 7mo ago), licensed MIT. It adds 50 tokens to every session and 2,987 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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