# Codex Theme: Hermes Agent plugin

> Codex × ChatGPT inspired theme for the Hermes Desktop chat: dual light/dark palettes that follow the system appearance, graphite-on-paper typography with a 1.625 root line height (measured from ZCode's chat body) and…

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

Codex × ChatGPT inspired theme for the Hermes Desktop chat: dual light/dark palettes that follow the system appearance, graphite-on-paper typography with a 1.625 root line height (measured from ZCode's chat body) and content-spacing presets (1.5/1.625/1.75), the OpenAI radius scale (inline 4px / rows 8px / controls 10px / cards 12px / composer 20px), hairline borders instead of shadows, and an 880px reading column with 768/880/992px presets. Settings → Plugins → Codex Theme offers appearance mode, reading width, content spacing, text & code font presets, user/assistant chat bubble colors and a bilingual (EN/中文) UI as native controls; the theme paints theme-level tokens only and never writes user-configurable settings such as --chat-text-scale. v1.2.0 is a compliance release — the composer-drag and input-focus-guard features of the v1.1 line were removed because they patched prototypes and captured global events, which catalog rule 8 forbids.

## Good to know before installing

No network calls, no telemetry, no credentials; registers only through the Desktop plugin SDK (THEMES_AREA, PALETTE_AREA, ctx.registerSettingsPage, ctx.i18n), switches the active theme to Codex once on first install, and keeps its preferences in plugin-scoped ctx.storage.

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 codex-theme
```

2. Said no? Turn it on later:

```bash
hermes plugins enable codex-theme
```

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: Hermes Desktop add-ons
- Maintained by: hey-yx (Community)
- Needs: No API keys declared
- Requires Hermes: `>=0.22.0`
- Version: 1.2.0
- In the catalog since: 2026-10-24, updated 2026-10-25

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/codex-theme)
- [Source code](https://github.com/hey-yx/hermes-codex-theme)
- [All plugins](https://hermeswatcher.com/plugins.md)

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