# Ctx checkpoint: Hermes Agent plugin

> Memory provider that archives the direct user/assistant transcript into a ctx knowledge store before every compaction, deterministically and with no LLM in the path, and hands the resulting block IDs to the compaction…

Canonical: https://hermeswatcher.com/plugins/ctx_checkpoint  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/ctx_checkpoint  
Last updated in catalog: 2026-10-25

Memory provider that archives the direct user/assistant transcript into a ctx knowledge store before every compaction, deterministically and with no LLM in the path, and hands the resulting block IDs to the compaction summary so the exact wording stays recoverable. Best-effort on any supported Hermes; with compression.checkpoint_required on Hermes 0.21.1+ it uses the fail-closed pre-compress checkpoint contract (#94639) and blocks compaction until the checkpoint is durable.

## Good to know before installing

The turns about to be compacted (tool results and system prompts excluded, secrets redacted twice) are written through Hermes' MCP dispatch to the ctx server you configure in mcp_servers; the plugin holds no credentials, makes no other network calls and has no telemetry; it imports the core modules agent.redact, tools.registry and hermes_cli.config.

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 ctx_checkpoint
```

2. Said no? Turn it on later:

```bash
hermes plugins enable ctx_checkpoint
```

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: GottZ (Community)
- Needs: No API keys declared
- Requires Hermes: `>=0.20.4`
- Version: 0.4.4
- In the catalog since: 2026-10-25

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/ctx_checkpoint)
- [Source code](https://github.com/GottZ/ctx/blob/root/integrations/hermes/README.md)
- [All plugins](https://hermeswatcher.com/plugins.md)

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