# Mem Os: Hermes Agent plugin

> Local-first persistent memory: store durable facts once and recall them in any session.

Canonical: https://hermeswatcher.com/plugins/mem-os  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/mem-os  
Last updated in catalog: 2026-09-19

Local-first persistent memory: store durable facts once and recall them in any session. Portable Agent Plugins v1 package (mcp.json + skills/): the @mem-os/sdk MCP server (pinned 1.6.26) over npx stdio, plus the mem-os-memory skill covering when to store and when to recall. All data stays in a local SQLite database under the user home directory; no cloud, no telemetry, no API keys. Server cwd is ${PLUGIN_DATA} so nothing is written into the install tree. Needs Node.js and npm on PATH.

## How to install

1. Install it. Hermes asks for any API keys it needs, then asks whether to turn it on.

```bash
hermes plugins install mem-os
```

2. Said no? Turn it on later:

```bash
hermes plugins enable mem-os
```

3. Restart Hermes so it loads the plugin.

Some plugins also need a sign-in or settings: see the official page. Memory plugins ask whether to become your memory provider instead. Steps follow the official plugins guide: https://hermes-agent.nousresearch.com/docs/user-guide/features/plugins

## Facts

- Category: Memory & notes
- Maintained by: Markgatcha (Community)
- Needs: No API keys declared
- In the catalog since: 2026-09-19

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/mem-os)
- [Source code](https://github.com/Markgatcha/memos#readme)
- [All plugins](https://hermeswatcher.com/plugins.md)

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