TheBetterBuy MCP server

• Registry nameuk.co.thebetterbuy/product-comparisonverified in the MCP registry

The registry name sits under thebetterbuy.co.uk. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-21
• Tools4
• Server calls itselfthebetterbuy-catalog
• Server version1.0.0
• Protocol version2025-06-18

On 2026-10-21 the server answered initialize and tools/list without a sign-in. First answer in 457 ms.

• Its tools do compare one product's price across several UK retailers, but not track daily price changes on products.
• Checked on 5 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
• What an agent can do with it1 of 2 use cases
• Answeredmeasuring5 of the 7 daily checks it takes to print a share
• Median first answer466 ms
• Space in an agent's context≈ 655 tokensthe definitions of all its tools (4), which an agent carries on every turn
• Tool definitionsB · 83 of 100
• Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once

• Not saying whether it only reads or can destroy: 4 of 4

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• search_catalog

  Search TheBetterBuy product catalog. Returns a slimmed list of products (title, slug, brand, price, image, number of offers) plus a total count. Use list_categories to discover valid category values. Sorting is only supported by price.

• get_product

  Fetch a single full product by slug (preferred) or GTIN, including all retailer offers (sources). Provide exactly one of slug or gtin.

• get_offers

  Return the retailer offers (price, link, shipping/returns info) for a product identified by slug or GTIN, plus affiliate-link fallbacks. Provide exactly one of slug or gtin.

• list_categories

  List the available product categories with their filter tag, human-readable name, and product count. Use the returned 'category' value as the category filter in search_catalog.