---
title: "Temporal knowledge graph · agent building block · Agent Fieldbook"
url: https://agentfieldbook.org/design/building_blocks/temporal-kg/
description: "Facts are nodes; relationships are edges carrying valid_from / invalid_at metadata: a time-aware model of the world the agent can query for \"what is true now vs then\"."
section: "Design · Building Blocks · Ontology"
source: Agent Fieldbook — generated from the published page
---

# Temporal knowledge graph

Facts are nodes; relationships are edges carrying valid_from / invalid_at metadata: a time-aware model of the world the agent can query for "what is true now vs then".

## How it works

## At a glance

| Field | Value |
| --- | --- |
| Kind | Ontology· Knowledge graph |
| Example | Zep / Graphiti |

## Basis

- [getzep.com](https://www.getzep.com)