Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/imoonkey/openweb/costconpx skills add imoonkey/openweb --skill costcogit clone --depth 1 https://github.com/imoonkey/openwebWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.01199 |
| Opus 5 | $0.00000 | $0.00600 |
| Sonnet 5 | $0.00000 | $0.00240 |
| Haiku 4.5 | $0.00000 | $0.00120 |
Grade A, and why
costco scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Costco
Overview
E-commerce warehouse club. Product search, detail, reviews, warehouse locator, delivery options, cart management, and product comparison.
Workflows
Find and evaluate a product
searchProducts(query)→ product listings withitemNumbergetProductDetail(itemNumber)→ price, description, attributes, ratinggetProductReviews(productId)→ review summary, rating distribution, recommendation %
Compare products before buying
searchProducts(query)→ find candidates →itemNumberscompareProducts(itemNumbers)→ side-by-side price, brand, rating, attributesgetDeliveryOptions(itemNumber)→ shipping/pickup availability per product
Check warehouse availability
findWarehouses(latitude, longitude)→ nearby warehouses withwarehouseIdgetWarehouseDetails(warehouseId)→ full hours, services, amenitiescheckWarehouseStock(itemNumber, warehouseNumber)→ in-store vs online-only, price
Browse and discover
searchSuggestions(query)→ autocomplete completions to refine searchbrowseCategory(category)→ products by department with available filters
Cart management (requires login)
searchProducts(query)→itemNumberaddToCart(itemNumber, quantity)→orderItemIdupdateCartQuantity(orderItemId, quantity)→ update quantityremoveFromCart(orderItemId)→ remove item
Operations
| Operation | Intent | Key Input | Key Output | Notes |
|---|---|---|---|---|
| searchProducts | search by keyword | query | itemNumber, title, brands, pills | entry point, paginated (pageSize, offset) |
| searchSuggestions | autocomplete | query | term, type | entry point |
| getProductDetail | product details | itemNumber ← searchProducts | price, rating, attributes, buyable | price=0 means "see in cart" |
| getMultipleProducts | batch product lookup | itemNumbers ← searchProducts | price, brand, rating per item | |
| compareProducts | side-by-side comparison | itemNumbers ← searchProducts (2+) | price, brand, rating, attributes | |
| getProductReviews | review summary | productId ← searchProducts | totalReviews, averageRating, distribution | navigates page (BV widget) |
| getDeliveryOptions | shipping/pickup check | itemNumber ← searchProducts | options[].type, available, membershipRequired | types: shipping, business_delivery, warehouse_pickup |
| browseCategory | browse by department | category | products, availableFilters | entry point, paginated |
| findWarehouses | nearby warehouses | latitude, longitude | warehouseId, name, address, hours, services | entry point |
| getWarehouseDetails | full warehouse info | warehouseId ← findWarehouses | hours, services[].name/hours, has* booleans | |
| checkWarehouseStock | in-store availability | itemNumber ← searchProducts, warehouseNumber ← findWarehouses | inWarehouse, onlineOnly, price | |
| addToCart | add to cart | itemNumber ← searchProducts | orderItemId | write, requires login. Navigates to PDP; scrapes JWT + SKU |
| removeFromCart | remove from cart | orderItemId ← addToCart | success | write, requires login. Navigates to /CheckoutCartView |
| updateCartQuantity | change cart qty | orderItemId ← addToCart, quantity | success | write, requires login. Navigates to /CheckoutCartView |
What ships with it
19 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- adapters/costco-api.ts 39 KB runs code
- DOC.md 11 KB
- examples/addToCart.example.json 229 B
- examples/browseCategory.example.json 206 B
- examples/checkWarehouseStock.example.json 237 B
- examples/compareProducts.example.json 224 B
- examples/findWarehouses.example.json 193 B
- examples/getDeliveryOptions.example.json 230 B
- examples/getMultipleProducts.example.json 214 B
- examples/getProductDetail.example.json 208 B
- examples/getProductReviews.example.json 170 B
- examples/getWarehouseDetails.example.json 206 B
- examples/removeFromCart.example.json 240 B
- examples/searchProducts.example.json 198 B
- examples/searchSuggestions.example.json 201 B
- examples/updateCartQuantity.example.json 259 B
- manifest.json 1.1 KB
- openapi.yaml 35 KB
- PROGRESS.md 11 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 88 lines · 0 tokens per session scan A 102ba4d6c5d8
costco is a skill published in the GitHub repository imoonkey/openweb (58 stars, last pushed 2mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,199 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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