Vbj1808/retrieval-lens

Overview

Vbj1808/retrieval-lens is an MCP server that audits RAG retrieval. It logs the chunks the model saw before any answer was generated. This provides transparency into which retrieved documents influenced the response.

Best for

Best for
Developers debugging and auditing RAG retrieval pipelines

Use cases

• Debugging RAG pipelines to see which chunks were used
• Auditing model citations in generated answers
• Verifying retrieval accuracy in production systems

How to use

Install

npx retrieval-lens

Tools exposed

• retrieval_observe
• retrieval_query
• retrieval_diff
• retrieval_stats

Tested with

Claude Code

Notes

Vbj1808/retrieval-lens is an MCP server that audits RAG retrieval. It logs the chunks the model saw before any answer was generated. This provides transparency into which retrieved documents influenced the response.

1 stars on GitHub. Last updated 2026-06-08. Licensed MIT.

Use cases

• Debugging RAG pipelines to see which chunks were used
• Auditing model citations in generated answers
• Verifying retrieval accuracy in production systems

Pros

• Provides direct visibility into retrieved chunks
• Lightweight MCP server integration
• Open source and easy to inspect

Cons

• Low adoption and limited community support
• Only logs chunks without evaluating relevance
• Requires manual inspection of logs for insights

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.