# Modernisation Engine: Hermes Agent plugin

> Controlled migration engine: maps an existing codebase, turns the behaviour that must survive into reviewable contracts, prepares a separate candidate and records old/new evidence before any production change.

Canonical: https://hermeswatcher.com/plugins/modernisation-engine  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/modernisation-engine  
Last updated in catalog: 2026-10-24

Controlled migration engine: maps an existing codebase, turns the behaviour that must survive into reviewable contracts, prepares a separate candidate and records old/new evidence before any production change.

## Good to know before installing

27 tools plus a `hermes modernise` CLI and `/modernise` slash command; `assess`, `plan`, `record` and `recipe` read source trees and files at absolute paths the agent supplies (refusing symlinks, `.env`, `auth.json`, `credentials.json` and SSH keys) and never import or run repository code; `recipe` creates a new directory at an agent-chosen absolute path holding a copy of the source with fixed metadata edits; job records live under the plugin's data directory; only after you set `operator_config` and sign a one-use Ed25519 owner grant do `run`, `cancel` and `recover` invoke the local `docker` CLI, outside Hermes's command-approval prompt, to run, inspect and remove rootless, network-disabled, read-only, resource-limited containers from digest-pinned images you allow-list (never pulled); no network calls, no telemetry, no self-updater.

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 modernisation-engine
```

2. Said no? Turn it on later:

```bash
hermes plugins enable modernisation-engine
```

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: Coding & developer tools
- Maintained by: Sahil-SS9 (Community)
- Needs: No API keys declared
- Adds tools: `modernise_status`, `modernise_assess`, `modernise_inventory`, `modernise_plan`, `modernise_record`, `modernise_protocol`, `modernise_response_protocol`, `modernise_schema`, `modernise_contract`, `modernise_prepare`, `modernise_attempts`, `modernise_review_request`, `modernise_review`, `modernise_rule_review_request`, `modernise_rule_review`, `modernise_rule_reviews`, `modernise_proposal`, `modernise_build`, `modernise_run`, `modernise_resume`, `modernise_control_request`, `modernise_cancel`, `modernise_recover`, `modernise_recover_build`
- Requires Hermes: `>=0.21.4`
- Version: 0.0.1
- In the catalog since: 2026-10-24

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/modernisation-engine)
- [Source code](https://github.com/Sahil-SS9/modernisation-engine)
- [All plugins](https://hermeswatcher.com/plugins.md)

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