---
title: "Reciprocal Rank Fusion (RRF) · agent retrieval pattern · Agent Fieldbook"
url: https://agentfieldbook.org/memory/retrieval/rrf-fusion/
description: "Merge channel results by a weighted score based on each result's rank; fact-key matches weighted highest, raw messages lowest; ties broken by recency."
section: "Memory · Retrieval"
source: Agent Fieldbook — generated from the published page
---

# Reciprocal Rank Fusion (RRF)

Merge channel results by a weighted score based on each result's rank; fact-key matches weighted highest, raw messages lowest; ties broken by recency.

Verified against [blog.cloudflare.com](https://blog.cloudflare.com/introducing-agent-memory/)

- [blog.cloudflare.com](https://blog.cloudflare.com/introducing-agent-memory/)

## How it works

## At a glance

| Field | Value |
| --- | --- |
| Stage | Retrieval |
| Phase | Read |
| Used by | Cloudflare Agent Memory |

## Trade-off

Per-channel weights are a tuning surface; bad weights drown the strongest signal.

## Basis

## Verified against

- [https://blog.cloudflare.com/introducing-agent-memory/](https://blog.cloudflare.com/introducing-agent-memory/)

The corpus does not rewrite vendor documentation. Where copy is quoted verbatim it is marked as such and attributed to its source.