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Agent skill

Shopify Checkout Extensions

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Build Checkout UI Extensions to customize Shopify checkout with sandboxed React-like components.

MITAuto-check passedFrontend & Design

Install Shopify Checkout Extensions

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill shopify-checkout-extensions -a claude-code

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

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace shopify-checkout-extensions --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/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/shopify-checkout-extensions .claude/skills/shopify-checkout-extensions && 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
shopify-checkout-extensions
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
301 words
Files
4 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Build Checkout UI Extensions to customize Shopify checkout with sandboxed React-like components.

  • Works in 4 steps: Configure the Extension → Build with UI Components → Read Checkout Data with Hooks → …
  • Replacing checkout.liquid (deprecated Aug 2025)
  • SKILL.md covers Overview, Prerequisites, Instructions and Output, plus 3 more sections
  • Calls shopify

What it does

Shopify Checkout Extensions is an agent skill from jeremylongshore/tons-of-skills-marketplace. Build Checkout UI Extensions to customize Shopify checkout with sandboxed React-like components. Use when replacing checkout.liquid (deprecated Aug 2025), adding custom fields to checkout, displaying banners, or reading checkout state with hooks. Trigger with phrases like "shopify checkout extension", "shopify checkout ui", "checkout customization shopify", "checkout.liquid migration", "shopify checkout components".

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/bundle-optimization.md`, `references/extension-targets.md` and `references/ui-components.md`). Compatibility notes: Designed for Claude Code

It sits in Frontend & Design. It works with Shopify and React. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Replacing checkout.liquid (deprecated Aug 2025)
  • Adding custom fields to checkout
  • Displaying banners
  • Reading checkout state with hooks

Example prompts

  • “shopify checkout extension”
  • “shopify checkout ui”
  • “checkout customization shopify”
  • “/shopify-checkout-extensions”

Requirements

  • Node.js
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Write, Edit, Bash(npm:*), Grep

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Configure the Extension
  2. Build with UI Components
  3. Read Checkout Data with Hooks
  4. Bundle Size Strategies

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. 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
    • Write
    • Edit
    • Bash(npm:*)
    • Grep

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • shopify

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

  • Network

    Links to these hosts (documentation or services it may open):

    • shopify.dev

    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.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Shopify Checkout Extensions loads about 1.2k tokens when it runs, and up to ~4.1k if it reads all its reference files. Until then it costs about 112 tokens; SKILL.md has 301 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~112
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.1k

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 passed

The automated check found no risky patterns in SKILL.md.

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 jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 301 words, ~1,221 tokens.

Download SKILL.mdSave it as .claude/skills/shopify-checkout-extensions/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
shopify-checkout-extensions
description
Build Checkout UI Extensions to customize Shopify checkout with sandboxed React-like components. Use when replacing checkout.liquid (deprecated Aug 2025), adding custom fields to checkout, displaying banners, or reading checkout state with hooks. Trigger with phrases like "shopify checkout extension", "shopify checkout ui", "checkout customization shopify", "checkout.liquid migration", "shopify checkout components".
allowed-tools
Read, Write, Edit, Bash(npm:*), Grep
compatibility
Designed for Claude Code
version
2.7.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
saas, ecommerce, shopify

Shopify Checkout UI Extensions

Overview

Checkout UI Extensions replace checkout.liquid (deprecated August 2025) with sandboxed, React-like components at specific checkout targets. They run in isolation with no DOM access and a strict 64KB bundle limit, using Shopify's component library for consistent, accessible UIs.

Prerequisites

  • Shopify CLI 3.x+ and a Shopify Partners app
  • Node.js 18+, @shopify/ui-extensions-react package
  • Development store with checkout extensibility enabled

Instructions

Step 1: Configure the Extension
toml
# extensions/checkout-banner/shopify.extension.toml
api_version = "2025-01"
type = "ui_extension"

[[extensions.targeting]]
module = "./src/Checkout.tsx"
target = "purchase.checkout.block.render"

[extensions.capabilities]
api_access = true
network_access = false
Step 2: Build with UI Components
tsx
import {
  reactExtension, Banner, BlockStack, Text, useSettings,
} from "@shopify/ui-extensions-react/checkout";

export default reactExtension("purchase.checkout.block.render", () => <CheckoutBanner />);

function CheckoutBanner() {
  const { banner_text } = useSettings();
  return (
    <BlockStack spacing="tight">
      <Banner status="info">{banner_text || "Free shipping over $50!"}</Banner>
    </BlockStack>
  );
}
Step 3: Read Checkout Data with Hooks
tsx
import {
  useApplyMetafieldsChange, useTotalAmount, useShippingAddress, TextField,
} from "@shopify/ui-extensions-react/checkout";

function DeliveryNote() {
  const applyMetafieldsChange = useApplyMetafieldsChange();
  return (
    <TextField
      label="Delivery instructions"
      onChange={(value) => applyMetafieldsChange({
        type: "updateMetafield",
        namespace: "custom", key: "delivery_note",
        valueType: "string", value,
      })}
    />
  );
}
Step 4: Bundle Size Strategies
bash
shopify app build --verbose  # Check output size
# Import only what you use — each component adds ~1-3KB
# Avoid lodash, date-fns, zod — use native JS
# Split into multiple extensions if approaching 64KB

See extension-targets.md for all targets, ui-components.md for components, and bundle-optimization.md for size strategies.

Output

  • Checkout UI extension rendering at the configured target point
  • Custom data collection via metafield writes from checkout
  • Merchant-configurable settings via the extension editor
  • Sandboxed execution with no impact on checkout performance

Error Handling

ErrorCauseSolution
EXTENSION_LOAD_FAILEDBundle exceeds 64KB or invalid codeTree-shake deps; check size with --verbose
Sandbox violationDOM access, fetch, or window usageUse only Shopify components and hooks
CHECKOUT_COMPLETION_BLOCKEDExtension error with block_progressAdd try/catch; test all edge cases
Target not renderingWrong target or not enabledVerify target in TOML; check admin placement

Examples

Adding a Custom Field to Checkout

Collect delivery instructions or gift messages by rendering a text input at a specific checkout target and saving the value as a cart metafield.

See Extension Targets for all available targets and placement options.

Building a Reusable Checkout Banner

Create a merchant-configurable promotional banner using Shopify's UI component library with proper accessibility.

See UI Components for available components and their key props.

Optimizing Extension Bundle Size

Your checkout extension is approaching the 64KB limit. Apply tree-shaking, dependency auditing, and extension splitting strategies.

See Bundle Optimization for size measurement and reduction techniques.

Resources

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

Files

SKILL.md and 3 other files (references) in skills/.curated/shopify-checkout-extensions of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/bundle-optimization.md
  • references/extension-targets.md
  • references/ui-components.md

Open the folder on GitHubat commit cfae287

Compare with similar skills

Shopify Checkout Extensions next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Shopify Checkout Extensions compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Shopify Checkout Extensions this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: PassMIT
Shopify ExpertJeffallan/claude-skills12k—~1.8kAutomated safety check: PassMIT
Web Artifacts Builderanthropics/skills180k40 repos~769Automated safety check: PassApache-2.0
React Doctormakeplane/plane61k12 repos~657Automated safety check: PassAGPL-3.0
React Router Developmentremix-run/react-router57k1 repos~1.5kAutomated safety check: PassMIT
React UI State PatternsChrisWiles/claude-code-showcase6.1k8 repos~1.6kAutomated safety check: PassNone

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Works with

Categories

Questions about Shopify Checkout Extensions

What does Shopify Checkout Extensions do?

Build Checkout UI Extensions to customize Shopify checkout with sandboxed React-like components. Shopify Checkout Extensions is an agent skill from jeremylongshore/tons-of-skills-marketplace. Build Checkout UI Extensions to customize Shopify checkout with sandboxed React-like components.

When should I use Shopify Checkout Extensions?

Shopify Checkout Extensions fits situations like: replacing checkout.liquid (deprecated Aug 2025); adding custom fields to checkout; displaying banners; reading checkout state with hooks.

How do I install Shopify Checkout Extensions in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill shopify-checkout-extensions -a claude-code`. Or copy the skill folder (skills/.curated/shopify-checkout-extensions in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/shopify-checkout-extensions in your project. Claude Code loads it when a task matches its description.

How do I install Shopify Checkout Extensions in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill shopify-checkout-extensions -a codex`. Or copy the skill folder (skills/.curated/shopify-checkout-extensions in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/shopify-checkout-extensions in your project. Codex loads it when a task matches its description.

Can I use Shopify Checkout Extensions 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 jeremylongshore/tons-of-skills-marketplace --skill shopify-checkout-extensions -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/shopify-checkout-extensions, .gemini/skills/shopify-checkout-extensions, .github/skills/shopify-checkout-extensions and .opencode/skills/shopify-checkout-extensions in your project.

What does Shopify Checkout Extensions need to run?

Going by SKILL.md and its folder, Shopify Checkout Extensions needs the command-line tools its instructions call (shopify). Our summary lists: Node.js. Its frontmatter pre-approves these tools: Read, Write, Edit, Bash(npm:*), Grep. Compatibility (from SKILL.md): Designed for Claude Code.

Does Shopify Checkout Extensions access the network?

SKILL.md names 1 domain. As links in the text: shopify.dev. This is read from the text; nothing was executed.

Is Shopify Checkout Extensions safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Shopify Checkout Extensions use?

Shopify Checkout Extensions is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Shopify Checkout Extensions use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.9k tokens, read only when the agent opens those files.

What are the alternatives to Shopify Checkout Extensions?

Skills that share tags, products or a category with Shopify Checkout Extensions: Shopify Expert (Jeffallan/claude-skills, 12k stars), Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 61k stars) and React Router Development (remix-run/react-router, 57k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Shopify Checkout Extensions?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.