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Yappman Data Supermarket Price Snapshots

io.github.yappmaniac/grocery-price-snapshotsyappmaniacstreamable-httpv0.1.0Scanned

Read-only supermarket price snapshots (UK basket, AU index). Compilation CC BY 4.0. Not live.

4 tools: 4 only read.

Tools: 0 delete, 0 irreversible, 0 write, 4 read.
  • Reads private data · 0
  • Reads text others write · 0
  • Can send data out · 0
  • No findings

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Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

4 tools

Only reads 4Show 4 read-only tools
  • about_the_dataReturns the licence (CC BY 4.0) and credit form, what is not served, the store setting, the published index weeks and the basket date range with its short and missing days.No findings

    Why it is in this group

    • The description's first verb is "return": a word for reading.
    Description, as the server wrote it
    Returns the licence (CC BY 4.0) and credit form, what is not served, the store setting, the published index weeks and the basket date range with its short and missing days. Use it before citing or relying on the other tools.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_shelf_price_indexReturns one published week of the free UK or Australian online shelf-price index (CC BY 4.0): index levels, week-on-week change and matched-product counts by retailer and product c…No findings

    Why it is in this group

    • The name "get_shelf_price_index" says "get": a word for reading.
    Description, as the server wrote it
    Returns one published week of the free UK or Australian online shelf-price index (CC BY 4.0): index levels, week-on-week change and matched-product counts by retailer and product class. Use it for "how did posted grocery shelf prices move this week". Not a CPI, not prices paid, no product names. Omit vintage for the latest week; call list_index_vintages for the others.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_index_vintagesReturns the published weeks (vintages) of the free UK or Australian online shelf-price index, newest first, with publication time, revision and base week.No findings

    Why it is in this group

    • The name "list_index_vintages" says "list": a word for reading.
    Description, as the server wrote it
    Returns the published weeks (vintages) of the free UK or Australian online shelf-price index, newest first, with publication time, revision and base week. Use it before get_shelf_price_index to pick a week. Not for prices.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • lookup_basket_pricesReturns posted shelf prices from the free UK daily 212-item basket (CC BY 4.0) for up to 20 barcodes (EAN) or retailer product ids, up to one row per retailer for one day: price, w…No findings

    Why it is in this group

    • The name "lookup_basket_prices" says "lookup": a word for reading.
    Description, as the server wrote it
    Returns posted shelf prices from the free UK daily 212-item basket (CC BY 4.0) for up to 20 barcodes (EAN) or retailer product ids, up to one row per retailer for one day: price, was-price, loyalty price, unit price, pack size and stock. Use it for "what did this barcode cost at Tesco, Sainsbury's, Asda or Aldi on a day". Static snapshot days, not live. Not for searching by product name, and only the 212 basket products are covered.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http grocery-price-snapshots https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp
claude mcp add --transport http grocery-price-snapshots https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__grocery-price-snapshots__get_shelf_price_index",
      "mcp__grocery-price-snapshots__list_index_vintages",
      "mcp__grocery-price-snapshots__lookup_basket_prices",
      "mcp__grocery-price-snapshots__about_the_data"
    ],
    "ask": [],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as grocery-price-snapshots. Review it before you use it.

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.yappmaniac/grocery-price-snapshots/verify?hash=c85ce82be26492536d6d08e96ac2bf86e8b602084da444b002e49cb91c690f47" | jq -e '.changed == false'

Pinned hash c85ce82be264, from Oct 23, 2026, 18:19 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.yappmaniac/grocery-price-snapshots/changes.xml

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Badge

anlyon.dev badge for io.github.yappmaniac/grocery-price-snapshots
[![anlyon.dev](https://anlyon.dev/badge/io.github.yappmaniac/grocery-price-snapshots.svg)](https://anlyon.dev/servers/io.github.yappmaniac/grocery-price-snapshots)

Source: MCP Registry. Synced Oct 23, 2026, 19:18 UTC.