# Persistent memory: retain compact working knowledge

> Retain stable preferences and environment facts across sessions while keeping detailed evidence in durable project records.

Canonical: https://hermeswatcher.com/tools/memory  
Kind: Capability · Research & knowledge work  
Last reviewed: Oct 19, 2026  
Basis: Explained from the official Hermes Agent docs and repository (Nous Research). Steps follow the linked official sources.

## What it is for

Hermes documents bounded memory files for agent notes and user preferences, plus session search. These support continuity, but they are not an unlimited archive or a substitute for source material. A useful division is to store compact, reusable facts in memory and keep decisions, reports, and original evidence in project files. This makes a future session more efficient without forcing every detail into the initial prompt.

## What you need

- A clearly identified Hermes profile and access to its memory and session data.
- A policy for what should persist, what is sensitive, and which source record remains authoritative.

## Setting it up

1. Start with a small set of stable facts and preferences. Ask the agent to preserve their source or project location when useful.
2. Keep changing status in dated project notes. Correct obsolete memory when an environment or decision changes, and confirm which profile owns the update.

## How to check it works

- Open a new session and ask a concrete continuity question whose answer can be checked against the project record.
- Inspect the stored state when a remembered fact appears stale; the documentation describes a session-start memory snapshot.

## Limits

- Memory is bounded and can become outdated. A remembered claim still needs verification when consequences matter.
- Do not run independent writers against the same Hermes home. Separate profiles help prevent accidental mixing of personal notes and state.

## Related workflows

- [Carry project knowledge into the next session](https://hermeswatcher.com/workflows/project-knowledge.md)
- [Know whether an automation actually worked](https://hermeswatcher.com/workflows/reliable-recurring-automation.md)

## Sources

- [Official persistent memory](https://hermes-agent.nousresearch.com/docs/user-guide/features/memory)

---

HermesWatcher is an independent guide. It is not affiliated with or endorsed by Nous Research. The [official Hermes Agent documentation](https://hermes-agent.nousresearch.com/docs) and [repository](https://github.com/NousResearch/hermes-agent) from Nous Research are the authority; each page here lists the official sources it was written from. If this site and the official docs disagree, trust the official docs. Index for agents: https://hermeswatcher.com/llms.txt