# Hydradb: Hermes Agent plugin

> Long-term memory for Hermes, backed by HydraDB.

Canonical: https://hermeswatcher.com/plugins/hydradb  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/hydradb  
Last updated in catalog: 2026-10-20

Long-term memory for Hermes, backed by HydraDB. Relevant context is recalled before each turn, and completed turns are saved in the background.

## Good to know before installing

When selected as the memory provider, each turn's user message (as the recall query) and every completed user/assistant turn are sent over HTTPS to the HydraDB API (api.hydradb.com, or HYDRADB_BASE_URL) under HYDRADB_API_KEY.

From the plugin's catalog listing.

## How to install

1. Install it. Hermes asks for any API keys it needs (this one needs `HYDRADB_API_KEY`, `HYDRADB_DATABASE`), then asks whether to turn it on.

```bash
hermes plugins install hydradb
```

2. Said no? Turn it on later:

```bash
hermes plugins enable hydradb
```

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: hydra-db (Community)
- Needs: `HYDRADB_API_KEY`, `HYDRADB_DATABASE` (API keys)
- Works on: linux, macos, windows
- Requires Hermes: `>=0.21.5`
- Version: 1.0.1
- In the catalog since: 2026-10-06, updated 2026-10-20

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/hydradb)
- [Source code](https://github.com/hydra-db/hydradb-hermes-plugin#readme)
- [All plugins](https://hermeswatcher.com/plugins.md)

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