retrieval-lens MCP server

retrieval-lens is a small helper that records what your AI's search step found each time it looks something up. It is made for people building or testing AI assistants that answer questions from your own documents. If you have ever wondered why the AI gave a wrong answer, this helps you see what it actually read first.

What this MCP server does

You ask your AI to look something up in your documents. The AI uses this helper to write down what it found: the pieces of text, their scores, where they came from, and their order. Later, you can ask the AI to show you exactly what it saw before it answered a certain question. You can also ask it to compare two searches and point out what changed between them. Everything is saved in a small file on your own computer.

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What you can do with it

• Save a record of every search your AI does
• Look back at what your AI read before a specific answer
• Compare two searches to see what changed
• See average scores and which sources come up most
• Track how your searches change over time
• Keep all of this on your own machine, with no signup

Try asking your AI

• “Show me what you found when I asked about the refund policy yesterday”
• “Compare the search from before the update with the one after it”
• “Which sources come up most often in my support bot searches”
• “What was the average score of the chunks you retrieved last week”

What it gives back to you

You get back lists and short summaries in the chat. For example, it can show the pieces of text your AI read, their scores, and where they came from. When you compare two runs, it tells you what appeared, what disappeared, and which scores moved. The stats view gives you simple numbers like top sources and score ranges.

Before you start

Who it's for

People building or testing AI assistants that answer questions from their own documents, especially developers and support teams.