kronan-mcp
MCP server for the Krónan grocery store API. Claude can browse products, manage shopping notes, handle checkout, and track orders from Krónan's Snjallverslun (smart store) in Iceland.
Tools
25 tools over the Model Context Protocol:
| Category | Tools |
|---|---|
| Products | search_products, get_product, get_category_products, list_categories |
| Checkout | get_checkout, add_checkout_lines |
| Orders | list_orders, get_order, delete_order_lines, set_order_substitution, lower_order_quantity |
| Shopping notes | get_shopping_note, add_shopping_note_line, change_shopping_note_line, reorder_shopping_note_lines, delete_shopping_note_line, set_line_completion, clear_shopping_note, check_store_order_eligibility, apply_store_product_order, list_archived_lines, delete_archived_line |
| Product lists | list_product_lists, create_product_list, get_product_list, update_product_list, delete_product_list, clear_product_list, sort_product_list, update_product_list_item |
| Purchase stats | list_purchase_stats, set_purchase_stat_ignored |
| Account | get_me |
Install
npm install -g kronan-mcp
Or run directly with npx (no install needed):
npx kronan-mcp
Getting a token
Tokens are created in the Krónan Snjallverslun user settings. You need an account with Audkenni (Iceland's electronic ID) login. Go to your user or customer group settings page and create an access token. Tokens are prefixed with act_.
Usage with Claude Code
Add to your project's .claude/settings.local.json or global ~/.claude/settings.json:
{
"mcpServers": {
"kronan": {
"command": "npx",
"args": ["kronan-mcp"],
"env": {
"KRONAN_ACCESS_TOKEN": "act_your_token_here"
}
}
}
}
Then ask Claude things like:
- "Search for milk on Krónan"
- "What's in my shopping note?"
- "Add 2x of SKU 02500188 to my checkout"
- "Show my recent orders"
Architecture
src/
├── client.ts HTTP client wrapping all Krónan API endpoints
├── index.ts MCP server registering tools via @modelcontextprotocol/sdk
└── types.ts TypeScript interfaces matching the OpenAPI schema
Auth is Authorization: AccessToken <token> on every request. Rate limit is 200 requests per 200 seconds per user. The client detects 429 responses and tells the caller to wait.
All prices are integers in ISK (no decimals). 230 means 230 kr.
Errors go through a typed KronanApiError with status codes. The token is scrubbed from error messages so it doesn't leak to the LLM. Auth failures and rate limits get their own user-facing messages.
set_order_substitution and set_line_completion use read-then-toggle patterns. They're not idempotent. Don't retry on timeout without checking current state first.
API reference
Full OpenAPI schema at openapi-schema.yaml.
Development
npm install && npm run build # Build from source
npm run dev # Watch mode (recompiles on change)
npm test # Run tests
npm run test:watch # Watch mode tests
Tests
31 tests on the HTTP client: constructor validation, error paths (429, timeouts, JSON parse failures), token scrubbing, toggle method validation, eligibility endpoint edge cases.
npm test