FastStore Data Layer & API Integration

When this skill applies

Use this skill when:

• You need to fetch product data, extend existing queries with additional fields, or integrate third-party APIs.
• You need data beyond what native FastStore components display by default.
• You are creating API extensions in src/graphql/vtex/ or src/graphql/thirdParty/.
• You are adding GraphQL fragments in src/fragments/ to include new fields in predefined queries.
• You are writing server-side resolvers that call VTEX REST APIs or external services.

Do not use this skill for:

• Client-side state management (cart, session, search) — use the faststore-state-management skill.
• Visual theming — use the faststore-theming skill.
• Component replacement or props overriding — use the faststore-overrides skill.

Decision rules