Open-source MCP server for comparing products and asking the buyer before purchase.
Make your shopping agent compare, explain, and ask before buying.
NorthCinder is an open-source MCP server that helps an AI agent compare products against your brief. It returns a ranked shortlist with reasons, reports which stores it could and could not search, and requires a separate approval before checkout. Seller payment and affiliate data never improve a result's position.
NorthCinder is software you run. It works on your computer alongside the AI app you already use. The repository owner does not operate a NorthCinder service. There is no NorthCinder account, hosted control plane, or telemetry service.
You need Node.js 20 or later and an AI app that supports MCP.
The initializer walks you through local setup and prints the MCP configuration for your AI app. After you connect it, try a specific brief:
Find black wool running shoes under $130. Compare price, delivery, fit, and merchant trust. Tell me why the winner ranked first and which options were ruled out.
- the offers that matched the required criteria; - the score and machine-readable reasons for each recommendation; - rejected offers and the requirement each one missed; - merchant-trust evidence and missing evidence; - a store-by-store coverage report; and - sponsorship and source labels that remain attached to every offer.
Concern NorthCinder's rule Evidence --- --- --- Ranking Buyer criteria determine the order. Seller payment is not an input. Ranking specification and ranking source Sponsored offers Labeled sponsored offers remain below every organic result. Neutrality audit Coverage Unavailable and u
From the project README.
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