# Agent Hint: Hermes Agent plugin

> Give the inference engine behind each request a standard, machine-readable view of the agent session that produced it.

Canonical: https://hermeswatcher.com/plugins/agent-hint  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/agent-hint  
Last updated in catalog: 2026-10-16

Give the inference engine behind each request a standard, machine-readable view of the agent session that produced it. Injects an X-Agent-Hint header (base64url JSON: session identity and call index, lifecycle state, soft priority, a cache-pinning hint, optional measured statistics) on main LLM requests, and can emit session lifecycle events out of band as local ndjson or as POSTs to a URL you configure. Request bodies are never modified, and nothing is added or sent until the plugin is enabled. Lets a scheduler pin a session to the instance already holding its KV cache, or rank a user-blocked session above background work, without teaching the engine anything about the client.

## Good to know before installing

When enabled, every main LLM request carries an X-Agent-Hint header (base64url JSON with the session id, call index, lifecycle state, priority and cache hints) to whatever provider is configured, not only hint-aware engines; with status_sink: http the same session events and usage/latency statistics are POSTed to the status_url you set, and ndjson writes them under $HERMES_HOME.

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 agent-hint
```

2. Said no? Turn it on later:

```bash
hermes plugins enable agent-hint
```

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: AI models & providers
- Maintained by: dachaimahogany (Community)
- Needs: No API keys declared
- Requires Hermes: `>=0.21.6`
- Version: 0.5.1
- In the catalog since: 2026-10-16

## Links

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

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