---
title: "Supersession (version chains) · agent retrieval pattern · Agent Fieldbook"
url: https://agentfieldbook.org/memory/retrieval/supersession/
description: "A new memory with the same key supersedes the old via a forward-pointer version chain rather than deleting it; superseded vectors are pruned in parallel with new upserts."
section: "Memory · Retrieval"
source: Agent Fieldbook — generated from the published page
---

# Supersession (version chains)

A new memory with the same key supersedes the old via a forward-pointer version chain rather than deleting it; superseded vectors are pruned in parallel with new upserts.

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 | Harvest |
| Phase | Write |
| Used by | Cloudflare Agent Memory· Mem0 |

## Trade-off

Version chains grow unbounded without compaction; stale pointers if pruning lags.

## 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.