fastmcp/docs/python-sdk/fastmcp-server-transforms-search-bm25.mdx
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---
title: bm25
sidebarTitle: bm25
---
# `fastmcp.server.transforms.search.bm25`
BM25-based search transform.
## Classes
### `BM25SearchTransform` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/server/transforms/search/bm25.py#L88" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
Search transform using BM25 Okapi relevance ranking.
Maintains an in-memory index that is lazily rebuilt when the tool
catalog changes (detected via a hash of tool names).