MDKeyChunker: What Does One LLM Call per Chunk Buy for Markdown Retrieval?

Excerpt

arXiv:2603.23533v3 Announce Type: replace-cross Abstract: Markdown carries structure a parser reads for free: headers, section paths, and block boundaries. Many RAG pipelines also spend LLM calls per chunk on generated metadata. We ask what one LLM call per chunk buys over that free structure. MDKeyChunker splits Markdown into header-led chunks without splitting any block; makes one LLM call per chunk for a title, summary, keywords, entities, questions, and a subtopic key, showing the model the