# Yappman Data Supermarket Price Snapshots (remote · yappman-grocery-mcp.blue-bar-ca29.workers.dev)

Read-only UK/AU supermarket price index and UK basket snapshots. CC BY 4.0. Not live prices.

- Trust score: 72/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `yappman-grocery-mcp.blue-bar-ca29.workers.dev`: 72/100 (this document), [markdown](https://verifymcp.io/servers/yappmaniac-grocery-price-snapshots/yappman-grocery-mcp.md), [page](https://verifymcp.io/servers/yappmaniac-grocery-price-snapshots/yappman-grocery-mcp)

## Channel facts

- Endpoint: `https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.5`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1013 tokens (~202/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 43/100
  - Stability observed for 13 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Yappman Data Supermarket Price Snapshots MCP server?

Yappman Data Supermarket Price Snapshots is a hosted endpoint at https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

```json
{
  "mcpServers": {
    "yappmaniac-grocery-price-snapshots": {
      "url": "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "yappmaniac-grocery-price-snapshots": {
      "type": "http",
      "url": "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.yappmaniac-grocery-price-snapshots]
url = "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "yappmaniac-grocery-price-snapshots": {
      "type": "remote",
      "url": "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add yappmaniac-grocery-price-snapshots --url 'https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  yappmaniac-grocery-price-snapshots:
    url: "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "yappmaniac-grocery-price-snapshots": {
      "Transport": "http",
      "Url": "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add yappmaniac-grocery-price-snapshots -t streamable-http -u 'https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "yappmaniac-grocery-price-snapshots": {
      "type": "http",
      "url": "https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-04 (score 71, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “about_the_data” rewrote its description, which is the text the model reads
- [security] Tool “get_shelf_price_index” rewrote its description, which is the text the model reads
- [security] Tool “list_basket_products” rewrote its description, which is the text the model reads
- [security] Tool “list_index_vintages” rewrote its description, which is the text the model reads
- [security] Tool “lookup_basket_prices” rewrote its description, which is the text the model reads

### 2026-11-03 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 67, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “lookup_basket_prices” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 743 → 1000
- [functional improvement] MCP protocol: fail → pass
- [functional] MCP protocol version: 2025-06-18 → 2025-11-25
- [functional] Server version: 0.2.4 → 0.2.5
- [functional] Server version: 0.2.3 → 0.2.4
- [functional] Server version: 0.2.1 → 0.2.3
- [functional] New tool “list_basket_products”

### 2026-10-26 (score 66, +1)

- [security] Tool “lookup_basket_prices” rewrote its description, which is the text the model reads
- [functional] Server version: 0.1.0 → 0.2.1

## MCP tools (5)

### `get_shelf_price_index` (~231 tokens)

Shelf-price index for one week

Returns one published week of the UK or Australian online shelf-price index: index levels, week-on-week change and matched-product counts by retailer and product class. It measures posted online shelf prices, not prices paid; not a CPI or a government statistic. Index levels are not price levels and do not show which retailer is cheaper. No product names. matched and matchedShare show how many products each row rests on. Omit vintage for the latest week; list_index_vintages gives the others.

Input parameters:

- `class` (string): Only rows for this product class id, e.g. "dairy-eggs".
- `market` (string, required): uk or au. Example: "uk".
- `recordType` (string): Only rows of this kind, e.g. "headline". Omit for all rows.
- `retailer` (string): Only rows for this retailer id, e.g. "tesco" (UK) or "aldi_au" (AU).
- `vintage` (string): ISO week, e.g. "2026-W42". Omit for the latest published week.

Output parameters:

- `base` (string)
- `credit` (string)
- `market` (string)
- `notCpi` (boolean)
- `publishedAt` (string)
- `revision` (integer)
- `rows` (array)
- `title` (string)
- `vintage` (string)

### `list_index_vintages` (~78 tokens)

Published weeks of the shelf-price index

Lists the published weeks (vintages) of the UK or Australian online shelf-price index, newest first, with publication time, revision and base week. Returns no index values and no prices. Use it to choose a week for get_shelf_price_index.

Input parameters:

- `market` (string, required): uk or au. Example: "au".

Output parameters:

- `market` (string)
- `vintages` (array)

### `lookup_basket_prices` (~268 tokens)

Daily basket prices by barcode or product id

Returns shelf-price snapshot values from the UK daily 212-item basket for up to 20 barcodes (EAN) or retailer product ids, one day, up to one row per retailer: price, was-price, loyalty price, unit price, pack size and stock, as posted. Loyalty prices appear in the basket rows only, not in the index values. Static snapshot days, not live, not a price comparison, not a statement of which retailer is cheaper. No name search. Aldi has no barcodes: use product ids. Wider data: see about_the_data.

Input parameters:

- `date` (string): Day, e.g. "2026-10-08". Omit for the latest day loaded.
- `eans` (array): Barcodes, 8, 12, 13 or 14 digits, e.g. ["5000157024671"]. Give eans, products or both.
- `products` (array): Retailer product ids, e.g. [{"retailer": "tesco", "retailerProductId": "254656543"}].
- `retailers` (array): Only these retailers, e.g. ["tesco", "asda"]. Omit for all four. The basket holds no barcodes for Aldi: use products for Aldi.

Output parameters:

- `credit` (string)
- `date` (string)
- `notFound` (object)
- `rows` (array)

### `list_basket_products` (~178 tokens)

Product identifiers in the daily basket

Returns the identifiers of the products in the UK daily 212-item basket for one day, sorted, with paging: retailer, retailer product id and barcodes (`ean`, empty where the basket holds none, as for Aldi). No names, brands or prices. Use it to find what lookup_basket_prices can look up.

Input parameters:

- `date` (string): Day, e.g. "2026-10-08". Omit for the latest day loaded.
- `limit` (integer): Products per page, 1 to 100. Omit for 100.
- `offset` (integer): Products to skip, from 0. Use nextOffset from the previous page. Example: 100.
- `retailers` (array): Only these retailers, e.g. ["tesco", "asda"]. Omit for all four.

Output parameters:

- `credit` (string)
- `date` (string)
- `nextOffset` (integer|null)
- `offset` (integer)
- `products` (array)
- `total` (integer)

### `about_the_data` (~71 tokens)

Licence, coverage and limits of the data

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. The licence covers our compilation only, not retailer content. Call it before citing or relying on the other tools.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/yappmaniac-grocery-price-snapshots/yappman-grocery-mcp#diagnostics

## Score history

- 2026-11-05: 72
- 2026-11-04: 71
- 2026-11-03: 71
- 2026-11-02: 70
- 2026-11-01: 70
- 2026-10-31: 69
- 2026-10-30: 69
- 2026-10-29: 68
- 2026-10-28: 68
- 2026-10-27: 67
- 2026-10-26: 66
- 2026-10-25: 65
- 2026-10-24: 65
- 2026-10-23: 64

## Common questions

### What is the Yappman Data Supermarket Price Snapshots MCP server?

Yappman Data Supermarket Price Snapshots is an MCP server listed in the public MCP registry as io.github.yappmaniac/grocery-price-snapshots. Read-only UK/AU supermarket price index and UK basket snapshots. CC BY 4.0. Not live prices. This page covers its hosted endpoint (https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp).

### Is the Yappman Data Supermarket Price Snapshots MCP server safe to use?

Yappman Data Supermarket Price Snapshots scores 72 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Yappman Data Supermarket Price Snapshots MCP server expose?

Yappman Data Supermarket Price Snapshots exposes 5 tools: get_shelf_price_index, list_index_vintages, lookup_basket_prices, list_basket_products, about_the_data. Their descriptions and schemas cost roughly 826 tokens of context every time the server is loaded.

### Does the Yappman Data Supermarket Price Snapshots MCP server require authentication?

No. We connected to Yappman Data Supermarket Price Snapshots without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Yappman Data Supermarket Price Snapshots MCP server still maintained?

Yappman Data Supermarket Price Snapshots is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://yappman-grocery-mcp.blue-bar-ca29.workers.dev/mcp
- Website: https://data.yappman.com/
- Changelog RSS feed: https://verifymcp.io/servers/yappmaniac-grocery-price-snapshots/yappman-grocery-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/yappmaniac-grocery-price-snapshots/yappman-grocery-mcp.json
- HTML version of this page: https://verifymcp.io/servers/yappmaniac-grocery-price-snapshots/yappman-grocery-mcp