# Search a supplied text corpus

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

Rank supplied documents with fixed-parameter lexical BM25 and exact original UTF-16 token spans. Scores are binary64 logarithm approximations ordered at 12 decimal places, with exact ID ties. No embeddings, persistent index, web search or semantic relevance guarantee.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Rank my supplied documents by lexical BM25
- Retrieve matching passages from caller-supplied text with exact token offsets

## Outside this profile
- Web search, semantic/vector search, linguistic segmentation, relevance certification or verifying whether a passage supports a claim
- Network calls, external actions, supplied-evidence authenticity or factual correctness certification

Proposed nominal USD 0.005 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/corpus-bm25-search.json)
- [Input schema](/reference/schemas/corpus-bm25-search.input.json)
- [Output schema](/reference/schemas/corpus-bm25-search.output.json)
- [Fixed example](/reference/examples/corpus-bm25-search.json)
- [Complete HTML reference](/discover/tools/corpus-bm25-search)