Open Supermarkets

What it does

When your agent uses it

• Comparing grocery prices across several supermarkets
• Building a shopping basket from a list of items
• Finding and booking a delivery slot
• Checking nutrition and allergens for a product
• Reviewing past grocery orders or favourites

Example prompts

• “Compare the price of semi-skimmed milk at Tesco and Sainsbury's.”
• “Add the items on my shopping list to my Sainsbury's basket.”
• “Show the available delivery slots for this week.”
• “Run a dry-run checkout of my current basket.”

Requirements

• Node.js 18 or newer and TypeScript
• Playwright with Chromium, for providers that need browser login
• An account with each supermarket you want to use
• Compatibility (from SKILL.md): Node.js 18+, TypeScript. Playwright only for browser-auth providers. Delivery areas vary by retailer.
• Pre-approved tools (allowed-tools): Bash({baseDir}/node:*), Bash(supermarket:*), Bash(npm:run:supermarket:*)

What it can do on your machine

Read from SKILL.md and the folder at commit aff6880. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash({baseDir}/node:*)
  • Bash(supermarket:*)
  • Bash(npm:run:supermarket:*)

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 1 file in scripts/, which the agent can run.

  Shell commands in SKILL.md call:

  • npm
  • npx
  • node

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npm and npx, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Node.js 18+, TypeScript. Playwright only for browser-auth providers. Delivery areas vary by retailer.

  From compatibility in the SKILL.md frontmatter.

Context cost

Open Supermarkets loads about 1.4k tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 290 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~74

When it runs · the whole SKILL.md, loaded when a task matches

~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from abracadabra50/open-supermarkets at commit aff6880, republished under its MIT licence (© abracadabra50). 290 words, ~1,354 tokens.

name

open-supermarkets

description

Grocery automation across ten retailers in seven countries — UK, Netherlands, Belgium, Spain, Hungary, the US and Canada. Search, compare, basket, delivery slots and checkout, plus Open Food Facts nutrition and allergen enrichment. Available as CLI, MCP server, or agent skill.

allowed-tools

Bash({baseDir}/node:*), Bash(supermarket:*), Bash(npm:run:supermarket:*)

compatibility

Node.js 18+, TypeScript. Playwright only for browser-auth providers. Delivery areas vary by retailer.

license

MIT

metadata.author

zish

metadata.version

3.0.0

metadata.repository

https://github.com/abracadabra50/open-supermarkets

metadata.tags

groceries, supermarket, sainsburys, ocado, tesco, tesco-hu, hungary, albert-heijn, mercadona, kroger, instacart, uk, netherlands, belgium, spain, usa…

cd {baseDir}
npm install
npx playwright install chromium

# Search any supermarket
npm run groc -- --provider sainsburys search "milk"
npm run groc -- --provider tesco search "milk"
npm run groc -- --provider ocado search "milk"

# Compare across all stores
npm run groc compare "organic eggs" --json

# Provider is a flag - all commands work the same way
npm run groc -- --provider <store> basket
npm run groc -- --provider <store> add <id> --qty 2
npm run groc -- --provider <store> slots
npm run groc -- --provider <store> checkout --dry-run

# Start MCP server (stdio transport)
npx tsx src/mcp-server.ts
# Or after build:
node dist/mcp-server.js

{
  "mcpServers": {
    "uk-grocery": {
      "command": "node",
      "args": ["/path/to/uk-grocery-cli/dist/mcp-server.js"]
    }
  }
}

# Search ingredients across stores
npm run groc compare "chicken breast" --json
npm run groc compare "basmati rice" --json

# Add to cheapest provider
npm run groc -- --provider tesco add PRODUCT_ID --qty 1
npm run groc -- --provider tesco basket --json
npm run groc -- --provider tesco checkout --dry-run

npm run groc -- --provider tesco staples --add
npm run groc -- --provider tesco basket --json
npm run groc -- --provider tesco checkout --dry-run

npm run groc compare "organic milk" --json
# Returns results from all providers with prices

© abracadabra50, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 90 other files (scripts) in the repository root of abracadabra50/open-supermarkets.

• SKILL.md
• .dockerignore
• .github/ISSUE_TEMPLATE/bug-report.yml
• .github/ISSUE_TEMPLATE/provider-request.yml
• .github/PULL_REQUEST_TEMPLATE.md
• .github/workflows/ci.yml
• .gitignore
• AGENTS.md
• API-REFERENCE.md
• CONTRIBUTING.md
• Dockerfile
• LICENSE
• README.md
• SECURITY.md
• docs/API.md
• docs/SMART-SHOPPING.md
• docs/providers
• … and 74 more

Open the folder on GitHubat commit aff6880

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in abracadabra50/open-supermarkets, which our catalogue first saw on October 7, 2026.

• NeverSight/learn-skills.devdata/skills-md/abracadabra50/open-supermarkets/open-supermarkets