stock-velocity-report

Purpose

Calculates two critical replenishment metrics for every stocked SKU:

• Days of Supply (DoS): how many days of stock remain at current sales velocity
• Sell-Through Rate: percentage of stock sold vs. total received in the period

Read-only — no mutations.

Prerequisites

• Authenticated Shopify CLI session: shopify store auth --store <domain> --scopes read_products,read_orders,read_inventory
• API scopes: read_products, read_orders, read_inventory

Parameters

Parameter	Type	Required	Default	Description
store	string	yes	—	Store domain (e.g., mystore.myshopify.com)
days_back	integer	no	30	Sales window for velocity calculation
dos_alert_threshold	integer	no	14	Flag SKUs with fewer than this many days of supply
vendor_filter	string	no	—	Optional vendor to scope report
format	string	no	human	Output format: human or json

Safety

ℹ️ Read-only skill — no mutations are executed. Safe to run at any time.

Workflow Steps

1. OPERATION: productVariants — query Inputs: first: 250, select sku, inventoryQuantity, inventoryItem { id }, pagination cursor Expected output: All variants with on-hand quantities; paginate until hasNextPage: false

2. OPERATION: orders — query Inputs: query: "created_at:>='<NOW - days_back days>'", first: 250, select lineItems { variant { id }, quantity }, pagination cursor Expected output: Units sold per variant in the window

3. OPERATION: inventoryItems — query Inputs: Batch by inventory item IDs for stocked variants Expected output: Cost and tracked status per item

4. Calculate per SKU:

   • daily_velocity = units_sold / days_back
   • days_of_supply = on_hand / daily_velocity (∞ if velocity = 0)
   • sell_through_rate = units_sold / (units_sold + on_hand) × 100

GraphQL Operations

# productVariants:query — validated against api_version 2025-01
query VariantsForVelocity($query: String, $after: String) {
  productVariants(first: 250, after: $after, query: $query) {
    edges {
      node {
        id
        sku
        inventoryQuantity
        product {
          id
          title
          vendor
        }
        inventoryItem {
          id
        }
      }
    }
    pageInfo {
      hasNextPage
      endCursor
    }
  }
}

# orders:query — validated against api_version 2025-01
query SalesVelocityData($query: String!, $after: String) {
  orders(first: 250, after: $after, query: $query) {
    edges {
      node {
        lineItems(first: 50) {
          edges {
            node {
              quantity
              variant {
                id
                sku
              }
            }
          }
        }
      }
    }
    pageInfo {
      hasNextPage
      endCursor
    }
  }
}

# inventoryItems:query — validated against api_version 2025-01
query InventoryItemDetails($ids: [ID!]!) {
  nodes(ids: $ids) {
    ... on InventoryItem {
      id
      sku
      unitCost {
        amount
        currencyCode
      }
      tracked
    }
  }
}

Session Tracking

Claude MUST emit the following output at each stage. This is mandatory.

On start, emit:

╔══════════════════════════════════════════════╗
║  SKILL: Stock Velocity Report                ║
║  Store: <store domain>                       ║
║  Started: <YYYY-MM-DD HH:MM UTC>             ║
╚══════════════════════════════════════════════╝

After each step, emit:

[N/TOTAL] <QUERY|MUTATION>  <OperationName>
          → Params: <brief summary of key inputs>
          → Result: <count or outcome>

On completion, emit:

For format: human (default):

══════════════════════════════════════════════
STOCK VELOCITY REPORT  (<days_back>-day window)
  SKUs analyzed:              <n>
  Critical (< <threshold> DoS): <n>
  Healthy (≥ <threshold> DoS):  <n>
  Zero velocity (no sales):   <n>

  Critical SKUs:
    "<product>"  SKU: <sku>  DoS: <n>d  Velocity: <n>/day
  Output: velocity_<date>.csv
══════════════════════════════════════════════

For format: json, emit:

{
  "skill": "stock-velocity-report",
  "store": "<domain>",
  "period_days": 30,
  "dos_alert_threshold": 14,
  "skus_analyzed": 0,
  "critical_count": 0,
  "healthy_count": 0,
  "zero_velocity_count": 0,
  "output_file": "velocity_<date>.csv"
}

Output Format

CSV file velocity_<YYYY-MM-DD>.csv with columns: variant_id, sku, product_title, vendor, on_hand, units_sold, daily_velocity, days_of_supply, sell_through_pct, alert

Error Handling

Error	Cause	Recovery
THROTTLED	API rate limit exceeded	Wait 2 seconds, retry up to 3 times
Zero velocity for all SKUs	No orders in window	Flag all stocked SKUs as "no sales"; check date window
Variant without inventory item	Bundle or virtual product	Skip inventory data, calculate velocity from orders only

Best Practices

• days_back: 30 works well for fast movers; use days_back: 90 for slower-moving or seasonal products.
• SKUs with DoS < 14 and active marketing campaigns are highest priority for reorder — cross-reference with your supplier lead times.
• Zero-velocity SKUs are candidates for the dead-stock-identifier workflow — if they've had no sales for 90+ days with stock on hand, consider markdown or discontinuation.
• Run weekly during peak season to catch fast-depleting SKUs before they go out of stock.