# Codex Truly: Hermes Agent plugin

> Gives ChatGPT/Codex-subscription models the context window the backend actually accepts instead of the one its catalog advertises.

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

Gives ChatGPT/Codex-subscription models the context window the backend actually accepts instead of the one its catalog advertises. Measured live on 2026-10-14: gpt-6.1-sol advertises 500K, caps at 872K and accepts 919,956 input tokens, while the -900k opt-in variant had silently stopped working because Hermes only raises a legacy 272K advertisement. The plugin reads the live catalog, writes one scoped model_overrides.<provider>.<model_id>.context_window entry per model (a documented step of context resolution, so no core patch), and ships a probe that bisects the API for the true ceiling because the refusal is a late SSE event, not an HTTP error. It also selects core's Codex-backed image provider so image_generate runs on the subscription with no OPENAI_API_KEY.

## Good to know before installing

Uses the profile's Codex sign-in through Hermes's credentialed_provider_request (requires_auth: [openai-codex]); the plugin never reads auth.json and never holds a token, and network calls go only to chatgpt.com. Its only writes are scoped model_overrides entries and image_gen.provider (only when unset), through Hermes's atomic config writers; revert removes exactly what it wrote. No telemetry, no background processes, no shell commands, no self-updater. probe spends subscription quota (refused requests are free, accepted ones bill) and is never run automatically. Disclosure — uses the profile's Codex sign-in only through Hermes's credentialed_provider_request (requires_auth: openai-codex) and calls chatgpt.com only; its CLI and the model-callable codex_truly tool write scoped model_overrides context_window entries and image_gen.provider (only when unset) to config.yaml with no approval prompt, and `probe` sends large padding requests that spend subscription quota.

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-truly
```

2. Said no? Turn it on later:

```bash
hermes plugins enable codex-truly
```

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: kyssta-exe (Community)
- Needs: No API keys declared
- Adds tools: `codex_truly`
- Requires Hermes: `>=0.21.7`
- Version: 1.0.0
- In the catalog since: 2026-10-16

## Links

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

---

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