Shopify Dev Mcp

Shopify Dev MCP

Routes MCP tool calls for Shopify surfaces. Standard lookups, not deep reasoning.

⚠️ Skip if a bundled skill applies

The 7 official Shopify skills ship local validators (scripts/search_docs.mjs, scripts/validate.mjs) that are faster than the MCP and don't require a server round-trip:

| Surface | Use this skill instead | |---|---| | Admin GraphQL | shopify-admin | | App Home ` markup | shopify-polaris-app-home | | Admin Action/Block extensions | shopify-polaris-admin-extensions | | Modern checkout markup | shopify-polaris-checkout-extensions | | Customer Account UI | shopify-polaris-customer-account-extensions | | App Store pre-submission review | shopify-app-store-review | | shopify.app.toml / CLI workflows | shopify-use-shopify-cli` |

Use shopify-dev-mcp ONLY when:

• The surface isn't in the table above (storefront-graphql, customer, partner, payments-apps, functions, hydrogen, liquid, custom-data).
• You're cross-referencing schemas across two surfaces in one conversation.
• The bundled script for an installed skill is unavailable or erroring.

⚠️ NOT for legacy post-purchase

The MCP does NOT index @shopify/post-purchase-ui-extensions-react. validate_component_codeblocks rejects every legacy post-purchase component by design — the validator's polaris-checkout-extensions enum value covers MODERN @shopify/ui-extensions `` web components only.

For the legacy SDK: use the post-purchase-ui-extension skill and validate with tsc --noEmit.

Instructions

1 — Initialize

Call learn_shopify_api with the target api surface. Consult the [API Surfaces](#api-surfaces) appendix below to confirm the correct api value. Extract the returned conversationId — pass it to every subsequent call.

2 — Route

Determine which tool answers the question: doc search, schema introspection, extension targets, or full page fetch. Consult the [Tools Reference](#tools-reference) below for parameters and gotchas.

3 — Use

Call the appropriate tool(s). If switching API surfaces mid-conversation, call learn_shopify_api again with the existing conversationId and the new api.

4 — Validate

Before committing any generated code:

• ` component markup → validatecomponentcodeblocks` (mandatory)
• GraphQL queries/mutations → validate_graphql_codeblocks (mandatory)
• Liquid/theme files → validate_theme (mandatory)

5 — Fix and re-validate

If validation fails, fix errors and re-validate. Increment revision on the same artifactId to track iterations. If validation fails twice on the same artifact, stop and surface the error to the user.

---

API Surfaces

All 15 valid values for the api param on learn_shopify_api:

| api value | Description | |---|---| | admin | Admin GraphQL API (orders, products, metafields) | | admin-execution | Admin API execution surface (Shopify-internal — present in the learn_shopify_api enum but NOT in the GraphQL validator enum) | | storefront-graphql | Storefront API (custom storefronts, cart ops) | | partner | Partner API (dashboard data, apps, referrals) | | customer | Customer Account API (orders, payment methods, addresses) | | payments-apps | Payments Apps API (payment provider integrations) | | functions | Shopify Functions (discounts, delivery, cart transforms) | | polaris-app-home | App Home UI (` web components in admin iframe) | | polaris-admin-extensions | Admin action/block extensions | | polaris-checkout-extensions | Modern checkout web-component extensions (@shopify/ui-extensions, ). Does NOT cover @shopify/post-purchase-ui-extensions-react. | | polaris-customer-account-extensions | Customer account page extensions | | pos-ui | Point of sale UI extensions | | hydrogen | Hydrogen framework | | liquid | Liquid templates | | custom-data` | Metafields and metaobjects |

> Note: validate_component_codeblocks accepts one additional value — storefront-web-components — that is NOT valid for learn_shopify_api. See the validator's section below.

Tools Reference

> Tool availability varies by MCP server build. Some installations register only a subset (typically: learn_shopify_api, search_docs_chunks, validate_component_codeblocks, validate_graphql_codeblocks, validate_theme). If a tool below is not callable in your environment, fall back to search_docs_chunks.

learn_shopify_api

Purpose: Load API overview and get a conversationId. Must be called before all other tools.

| Param | Type | Required | Notes | |---|---|---|---| | api | enum (15 values above) | Yes | Target surface | | model | string | No (always provide) | Telemetry. Schema marks not-required, but the description says "ALWAYS provide". Pass the current model name; pass 'none' if unknown. | | conversationId | string (UUID) | No | Pass existing ID when switching surfaces mid-conversation. Omit on first call — a new ID is generated and returned. |

Returns: conversationId (UUID) — required by every subsequent tool call.

Gotchas:

• Call again (with same conversationId) when switching API surfaces. This loads new context without losing conversation state.
• The response includes a component/API index for the surface — use it to guide subsequent search_docs_chunks queries.

---

search_docs_chunks

Purpose: Semantic search over shopify.dev documentation. Returns relevant doc chunks with URLs.

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | prompt | string | Yes | Natural language search query | | api_name | string | No | Filter results to a specific API surface (use the same value as api in learn_shopify_api) | | max_num_results | number | No | Limit result count. Omit on first call; use when trimming for context-window constraints. |

Gotchas:

• Prefer this over fetch_full_docs for targeted lookups.
• For storefront-graphql, this is the only reliable doc tool — introspect_graphql_schema and fetch_full_docs are restricted.

---

fetch_full_docs

Purpose: Fetch complete documentation pages by path. Use when you need full property/slot/event details from a page found via search_docs_chunks.

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | paths | string[] | Yes | Doc paths relative to site root, e.g. ["/docs/api/app-home"] |

Gotchas:

• The learn_shopify_api response labels fetch_full_docs as DEPRECATED for some surfaces, but where present the tool still works. Prefer search_docs_chunks; fall back to fetch_full_docs for complete property/slot/event docs.
• For storefront-graphql, this tool is restricted — use search_docs_chunks instead.
• May not be registered in all MCP server builds.

---

validate_component_codeblocks

Purpose: Validate `` web component markup against Shopify's schema. Catches hallucinated components, props, and prop values.

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | api | enum | Yes | One of: polaris-app-home, polaris-admin-extensions, polaris-checkout-extensions, polaris-customer-account-extensions, pos-ui, hydrogen, storefront-web-components (7 values) | | code | array of { content: string, artifactId?: string, revision?: number } | Yes | Code blocks. content is required per item. Param key is code (not codeblocks). | | extensionTarget | string | No* | Required for extension surfaces: polaris-admin-extensions, polaris-checkout-extensions, polaris-customer-account-extensions, pos-ui. Determines which components/APIs are available. Where learn_extension_target_types is registered, use it to discover valid targets. |

Input format: Wrap code in a function — JS logic outside return, components inside return:

const Example = () => {
  const [value, setValue] = useState('');

  return (
    
      
        
      
    
  );
};

Raw HTML also works, but the function wrapper is recommended.

Gotchas:

• The param is code (array), not codeblocks — opposite naming from validate_graphql_codeblocks.
• Mandatory after generating ANY `` markup — never skip, even for small snippets.
• For polaris-checkout-extensions, pass the specific extensionTarget (e.g. purchase.checkout.block.render) to get accurate validation.
• The validator does not type App Bridge web components (`, ) as JSX intrinsic elements — they will fail validation in TSX even though they're real components. Use raw HTML, the App Bridge React wrappers (, `), or a JSX type augmentation.

---

GraphQL API enum

IMPORTANT — this enum differs from learn_shopify_api.

validate_graphql_codeblocks and introspect_graphql_schema share an expanded 18-value enum where functions splits into 13 specific subtypes. admin-execution is NOT in this enum — even though it's valid for learn_shopify_api.

| Value | Description | |---|---| | admin | Admin GraphQL API | | storefront-graphql | Storefront API | | partner | Partner API | | customer | Customer Account API | | payments-apps | Payments Apps API | | functions_cart_checkout_validation | Cart and Checkout Validation Function inputs | | functions_cart_transform | Cart Transform Function inputs | | functions_delivery_customization | Delivery Customization Function inputs | | functions_discount | Discount Function inputs | | functions_discounts_allocator | Discounts Allocator Function inputs | | functions_fulfillment_constraints | Fulfillment Constraints Function inputs | | functions_local_pickup_delivery_option_generator | Local Pickup Delivery Option Generator inputs | | functions_order_discounts | Order Discounts Function inputs | | functions_order_routing_location_rule | Order Routing Location Rule inputs | | functions_payment_customization | Payment Customization Function inputs | | functions_pickup_point_delivery_option_generator | Pickup Point Delivery Option Generator inputs | | functions_product_discounts | Product Discounts Function inputs | | functions_shipping_discounts | Shipping Discounts Function inputs |

---

validate_graphql_codeblocks

Purpose: Validate GraphQL queries/mutations against the Shopify schema. Catches hallucinated fields and operations.

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | codeblocks | array of { content: string, artifactId?: string, revision?: number } | Yes | Each content is raw GraphQL (no markdown backticks). Param key is codeblocks (not code). | | api | enum | No | Defaults to admin. See [GraphQL API enum](#graphql-api-enum). |

Gotchas:

• The param is codeblocks (array), not code — opposite naming from validate_component_codeblocks.
• Content must be raw GraphQL, not wrapped in markdown code fences.
• For Functions, use the specific functions_* subtype from the [GraphQL API enum](#graphql-api-enum), not functions.

---

introspect_graphql_schema

Purpose: Explore GraphQL schema — find fields, types, queries, mutations, and required scopes.

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | query | string | Yes | Simple search term (e.g. product, discountProduct, capture). One concept at a time. | | api | enum | No | Defaults to admin. Same expanded enum as validate_graphql_codeblocks — see [GraphQL API enum](#graphql-api-enum). | | filter | string[] | No | Filter results: all (default), types, queries, mutations. Pass as array, e.g. ["queries", "mutations"]. |

Fallback strategy (confirmed accurate):

1. Start with the most specific term from the request.
2. If no results, try broader terms or individual words (e.g. captureSession → try capture).
3. For list operations, try all, list, or the plural object name.
4. For mutations, try the action verb: create, update, delete.

Gotchas:

• Uses the same expanded api enum as validate_graphql_codeblocks — functions splits into 13 subtypes.
• For storefront-graphql, this tool is restricted — use search_docs_chunks instead.
• May not be registered in all MCP server builds.

---

learn_extension_target_types

Purpose: Get type declarations for components and APIs available within a specific extension target.

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | api | enum | Yes | The surface | | extension_target | string | Yes | The specific extension target (e.g. purchase.checkout.block.render) |

Supported surfaces:

• polaris-admin-extensions
• polaris-checkout-extensions
• polaris-customer-account-extensions
• pos-ui

Not supported:

• polaris-app-home — not an extension surface.

May not be registered in all MCP server builds. When unavailable, look up valid extension targets via search_docs_chunks instead.

---

validate_theme

Purpose: Validate Liquid and theme files (JSON locales, config, templates, JS, CSS, SVG).

| Param | Type | Required | Notes | |---|---|---|---| | conversationId | string | Yes | From learn_shopify_api | | absoluteThemePath | string | Yes | Absolute path to theme directory | | filesCreatedOrUpdated | array of { path: string, artifactId?: string, revision?: number } | Yes | path is relative to the theme root |

Validation Reference

Required params per surface for validate_component_codeblocks

| Surface | api | extensionTarget required? | |---|---|---| | polaris-app-home | polaris-app-home | No | | polaris-admin-extensions | polaris-admin-extensions | Yes | | polaris-checkout-extensions | polaris-checkout-extensions | Yes | | polaris-customer-account-extensions | polaris-customer-account-extensions | Yes | | pos-ui | pos-ui | Yes | | hydrogen | hydrogen | No | | storefront-web-components | storefront-web-components | No |

Artifact tracking

Both validate_component_codeblocks and validate_graphql_codeblocks support iterative tracking:

• artifactId — Stable ID for the code artifact. Omit on first validation (the tool generates one). Reuse the returned ID on subsequent validations of the same artifact.
• revision — Starts at 1. Increment on each re-validation of the same artifactId. Tracks validation retries vs. new validations.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: preetamnath
• Source: preetamnath/agent-skills
• License: MIT
• Homepage: https://www.preetamnath.com/blog/agent-skills

Install and usage instructions live in the source repository linked above.