# Gbrain Retrieval Reflex: Hermes Agent plugin

> pre_llm_call hook plugin, enabled with `hermes plugins enable`: injects ambient context from a GBrain instance before each turn (volunteer_context, then a hybrid-query fallback).

Canonical: https://hermeswatcher.com/plugins/gbrain-retrieval-reflex  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/gbrain-retrieval-reflex  
Last updated in catalog: 2026-10-02

pre_llm_call hook plugin, enabled with `hermes plugins enable`: injects ambient context from a GBrain instance before each turn (volunteer_context, then a hybrid-query fallback). Not a `memory.provider`. Silent no-op when GBrain is unreachable or no token is set.

## Good to know before installing

Before each non-trivial turn the last six user and assistant messages (truncated) and the current message are sent with a GBRAIN_TOKEN bearer token to GBRAIN_MCP_URL (default http://127.0.0.1:3131/mcp), and returned brain-page text is injected into the turn.

From the plugin's catalog listing.

## 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 gbrain-retrieval-reflex
```

2. Said no? Turn it on later:

```bash
hermes plugins enable gbrain-retrieval-reflex
```

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: aean0x (Community)
- Needs: No API keys declared
- Version: 0.6.1
- In the catalog since: 2026-10-02

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/gbrain-retrieval-reflex)
- [Source code](https://github.com/aean0x/hermes-gbrain-retrieval-reflex#readme)
- [All plugins](https://hermeswatcher.com/plugins.md)

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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