saleor-core
Saleor backend internals and behavior reference. Covers discount precedence, order-level discount allocation across lines (two-pass calculation, what the API does and doesn't expose, gift-line shape gotchas), stock availability modes (legacy vs direct, 3.23+), Dashboard UI rules, webhook trigger conditions, denormalized field semantics, and migration footguns. Use when working with Saleor discounts or stock availability, building Dashboard UI, building price-explanation tooling, or debugging backend behavior.
How do I install this agent skill?
npx skills add https://github.com/saleor/agent-skills --skill saleor-coreIs this agent skill safe to install?
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This skill is a documentation and reference guide for Saleor's backend discount logic. It contains static technical rules and code snippets for developer reference and does not perform any network operations, file modifications, or code execution.
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Risk: LOW · No issues
What does this agent skill do?
Saleor Core
Backend behavior reference derived from the Saleor core source code. Covers internal mechanics that aren't fully documented in the public API reference — discount precedence, stock availability modes, denormalized fields, and known Dashboard gotchas.
When to Apply
- Building or debugging discount/promotion UI in the Dashboard
- Investigating why a voucher or promotion isn't applying
- Understanding order-level vs line-level discount precedence
- Working with
OrderDiscount/OrderLineDiscountobjects - Debugging
unit_discount_valueonOrderLine - Deciding whether discounts stack or suppress each other
- Building price-explanation / waterfall tooling on confirmed orders
- Reconstructing how an order-level discount distributed across lines
- Handling free-gift order lines (
OrderLine.isGift = true) - Working on stock availability, shipping zones, warehouses, or
Shop.useLegacyShippingZoneStockAvailability - Debugging why
PRODUCT_VARIANT_*_IN_CHANNELwebhooks aren't firing - Building diagnostic / "doctor" tooling that explains availability problems
- Auditing Dashboard copy that uses "available" / "in stock" / "purchasable"
Rule Categories
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Discounts | CRITICAL | discount- |
| 2 | Stock | CRITICAL | stock- |
Quick Reference
1. Discounts (CRITICAL)
discount-precedence— Full precedence hierarchy, stacking rules, manual vs voucher vs promotion interactions, denormalized field semantics, known Dashboard bugorder-discount-allocation— Two-pass calculation of order-level discounts (Pass A collapses records into a single subtotal_discount; Pass B distributes proportionally across lines with last-line absorbing rounding), what the API exposes (per-line totals, per-record-at-order amounts) and what it doesn't (per-record-per-line decomposition), gift-line shape gotcha (ORDER_PROMOTIONonOrderLine.discounts[]whenisGift = true), reconstruction guidance for consumers
2. Stock (CRITICAL)
stock-availability-modes—Shop.useLegacyShippingZoneStockAvailability(3.23+), purchasability vs shippability, server queryset dispatch, mode-conditional webhooks, Dashboard UI / copy / severity rules, migration footguns, test fixtures
How to Use
Read individual rule files for detailed explanations and source-level evidence:
rules/discount-precedence.md
rules/order-discount-allocation.md
rules/stock-availability-modes.md
Each rule file contains:
- Precedence hierarchy or computation rules
- Source code references from
saleor/with function names and file paths - Anti-patterns and known bugs
How can the creator link this skill?
Add the canonical catalog link to the repository README so users can inspect current installs and available audits. The publishing guide covers the complete discovery path.
<a href="https://skillzs.dev/skills/saleor/agent-skills/saleor-core">View saleor-core on skillZs</a>