Shopify Polaris Checkout Extensions

Name: Shopify Polaris Checkout Extensions
Author: shopify

shopify/shopify-ai-toolkit

Build Shopify checkout UI extensions with correct Polaris APIs and pinned Admin, Storefront GraphQL, Partner, Customer, and Payments Apps API versions.

Overview

Shopify Polaris Checkout Extensions is an agent skill for the Build phase that helps solo builders implement Shopify checkout extensions against the correct Polaris and versioned Shopify APIs.

Install

npx skills add https://github.com/shopify/shopify-ai-toolkit --skill shopify-polaris-checkout-extensions

What is this skill?

Documents multiple Shopify API families: admin, storefront-graphql, partner, customer, payments-apps
Tracks unstable, release-candidate (2026-07), and latest stable (2026-04) version lines for extension work
Targets Polaris-aligned checkout extension patterns for Shopify app developers
Helps avoid shipping against deprecated API calendar versions
Fits Shopify AI Toolkit skills for agent-assisted extension scaffolding
5 named Shopify API families in the version matrix (admin, storefront-graphql, partner, customer, payments-apps)

Compatible agents: Claude Code, Cursor, Codex, any compatible agent

Adoption & trust: 4.7k installs on skills.sh; 373 GitHub stars; 2/3 security scanners passed (skills.sh audits).

What problem does it solve?

You are coding a Shopify checkout extension but are unsure which API version bundle to target across admin, storefront, partner, customer, and payments surfaces.

Who is it for?

Indie Shopify app developers adding checkout UI extensions on Polaris with agent assistance while pinning API versions for store submission.

Skip if: Non-Shopify storefronts, theme-only Liquid tweaks with no checkout extensibility, or merchants who only need generic ecommerce marketing copy.

When should I use this skill?

Implementing or updating Shopify checkout extensions and need Polaris plus correct API version references.

What do I get? / Deliverables

Your agent generates or refines extension work aligned to Shopify’s documented API version lines and checkout extension constraints instead of hallucinated endpoints.

Version-aligned extension configuration guidance
Checkout UI extension implementation snippets
API surface checklist per Shopify product line

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Journey fit

Primary fit

BuildIntegrations & version control

Checkout extensions are product engineering work that happens while you integrate with Shopify’s commerce platform, not while you are still validating the idea abstractly. Integrations matches third-party platform extension development, GraphQL API surfaces, and checkout customization against Shopify’s versioned APIs.

How it compares

Skill package for Shopify platform integration—not a generic headless commerce MCP or a marketing SEO playbook.

Common Questions / FAQ

Who is shopify-polaris-checkout-extensions for?

Solo builders and small teams building Shopify apps or checkout extensions who want their coding agent to respect Shopify API versioning and Polaris extension patterns.

When should I use shopify-polaris-checkout-extensions?

Use it during Build integrations when you scaffold, debug, or upgrade checkout extension code tied to Admin, Storefront GraphQL, Partner, Customer, or Payments Apps APIs.

Is shopify-polaris-checkout-extensions safe to install?

Treat it like any third-party Shopify toolkit skill: confirm license and source, scope agent network and secret access, and review the Security Audits panel on this Prism page before production stores.

SKILL.md

READMESKILL.md - Shopify Polaris Checkout Extensions

{
  "admin": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "storefront-graphql": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "partner": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "customer": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "payments-apps": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "polaris-app-home": [],
  "polaris-admin-extensions": [
    {
      "name": "2026-04",
      "releaseCandidate": true
    },
    {
      "name": "2026-01",
      "latestVersion": true
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "polaris-checkout-extensions": [
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "polaris-customer-account-extensions": [
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "pos-ui": [
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "hydrogen": [
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "storefront-web-components": [],
  "functions_cart_checkout_validation": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "functions_cart_transform": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "functions_delivery_customization": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "functions_discount": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {

What is this skill?

Documents multiple Shopify API families: admin, storefront-graphql, partner, customer, payments-apps

Tracks unstable, release-candidate (2026-07), and latest stable (2026-04) version lines for extension work

Targets Polaris-aligned checkout extension patterns for Shopify app developers

Helps avoid shipping against deprecated API calendar versions

Fits Shopify AI Toolkit skills for agent-assisted extension scaffolding

5 named Shopify API families in the version matrix (admin, storefront-graphql, partner, customer, payments-apps)

Compatible agents: Claude Code, Cursor, Codex, any compatible agent

Adoption & trust: 4.7k installs on skills.sh; 373 GitHub stars; 2/3 security scanners passed (skills.sh audits).

What do I get? / Deliverables

Your agent generates or refines extension work aligned to Shopify’s documented API version lines and checkout extension constraints instead of hallucinated endpoints.

Version-aligned extension configuration guidance

Checkout UI extension implementation snippets

API surface checklist per Shopify product line

Journey fit

Primary fit

BuildIntegrations & version control

SKILL.md

READMESKILL.md - Shopify Polaris Checkout Extensions

{
  "admin": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "storefront-graphql": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "partner": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "customer": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "payments-apps": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "polaris-app-home": [],
  "polaris-admin-extensions": [
    {
      "name": "2026-04",
      "releaseCandidate": true
    },
    {
      "name": "2026-01",
      "latestVersion": true
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "polaris-checkout-extensions": [
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "polaris-customer-account-extensions": [
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "pos-ui": [
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "hydrogen": [
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "storefront-web-components": [],
  "functions_cart_checkout_validation": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "functions_cart_transform": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "functions_delivery_customization": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {
      "name": "2026-04",
      "latestVersion": true
    },
    {
      "name": "2026-01"
    },
    {
      "name": "2025-10"
    },
    {
      "name": "2025-07"
    }
  ],
  "functions_discount": [
    {
      "name": "unstable"
    },
    {
      "name": "2026-07",
      "releaseCandidate": true
    },
    {

Overview

Install

What is this skill?

What problem does it solve?

Who is it for?

When should I use this skill?

What do I get? / Deliverables

Recommended Skills

Journey fit

Who is shopify-polaris-checkout-extensions for?

When should I use shopify-polaris-checkout-extensions?

Is shopify-polaris-checkout-extensions safe to install?

SKILL.md

This week for builders

Overview

Install

What is this skill?

What problem does it solve?

Who is it for?

When should I use this skill?

What do I get? / Deliverables

Recommended Skills

Journey fit

Who is shopify-polaris-checkout-extensions for?

When should I use shopify-polaris-checkout-extensions?

Is shopify-polaris-checkout-extensions safe to install?

SKILL.md