Plugin install fails on Windows with corrupted error message

Summary:
When running /plugin install codex@openai-codex on Windows with Node.js v20.10.5, the installation fails and outputs corrupted or unreadable error data instead of a normal error message.

Environment:

OS: Windows
Node.js version: v20.10.5

Steps to reproduce:

Open terminal on Windows.
Run /plugin install codex@openai-codex.
Observe the installation fails with a binary or corrupted error message (example output provided below).

Expected behavior:
The plugin should install successfully or display a clear, readable error message if it fails.

Actual behavior:
The command fails and outputs binary/corrupted data instead of a human-readable error message.

Example error output:

H�l]�#�U,�;... (binary/unreadable data)

Additional notes:

User was unable to provide more readable output.
This issue blocks installation and prevents further setup/use.

H�l]�#�U,�;... (binary/unreadable data)

H�l]�#�U,�;... (binary/unreadable data)

Arabic_Book_Master_Template.docx

Codex plugin for Claude Code

Use Codex from inside Claude Code for code reviews or to delegate tasks to Codex.

This plugin is for Claude Code users who want an easy way to start using Codex from the workflow
they already have.

What You Get

/codex:review for a normal read-only Codex review
/codex:adversarial-review for a steerable challenge review
/codex:rescue, /codex:status, /codex:result, and /codex:cancel to delegate work and manage background jobs

Requirements

ChatGPT subscription (incl. Free) or OpenAI API key.
- Usage will contribute to your Codex usage limits. Learn more.
Node.js 18.18 or later

Install

Add the marketplace in Claude Code:

/plugin marketplace add openai/codex-plugin-cc

Install the plugin:

/plugin install codex@openai-codex

Reload plugins:

/reload-plugins

Then run:

/codex:setup

/codex:setup will tell you whether Codex is ready. If Codex is missing and npm is available, it can offer to install Codex for you.

If you prefer to install Codex yourself, use:

npm install -g @openai/codex

If Codex is installed but not logged in yet, run:

!codex login

After install, you should see:

the slash commands listed below
the codex:codex-rescue subagent in /agents

One simple first run is:

/codex:review --background
/codex:status
/codex:result

Usage

`/codex:review`

Runs a normal Codex review on your current work. It gives you the same quality of code review as running /review inside Codex directly.

Note

Code review especially for multi-file changes might take a while. It's generally recommended to run it in the background.

Use it when you want:

a review of your current uncommitted changes
a review of your branch compared to a base branch like main

Use --base <ref> for branch review. It also supports --wait and --background. It is not steerable and does not take custom focus text. Use /codex:adversarial-review when you want to challenge a specific decision or risk area.

Examples:

/codex:review
/codex:review --base main
/codex:review --background

This command is read-only and will not perform any changes. When run in the background you can use /codex:status to check on the progress and /codex:cancel to cancel the ongoing task.

`/codex:adversarial-review`

Runs a steerable review that questions the chosen implementation and design.

It can be used to pressure-test assumptions, tradeoffs, failure modes, and whether a different approach would have been safer or simpler.

It uses the same review target selection as /codex:review, including --base <ref> for branch review.
It also supports --wait and --background. Unlike /codex:review, it can take extra focus text after the flags.

Use it when you want:

a review before shipping that challenges the direction, not just the code details
review focused on design choices, tradeoffs, hidden assumptions, and alternative approaches
pressure-testing around specific risk areas like auth, data loss, rollback, race conditions, or reliability

Examples:

/codex:adversarial-review
/codex:adversarial-review --base main challenge whether this was the right caching and retry design
/codex:adversarial-review --background look for race conditions and question the chosen approach

This command is read-only. It does not fix code.

`/codex:rescue`

Hands a task to Codex through the codex:codex-rescue subagent.

Use it when you want Codex to:

investigate a bug
try a fix
continue a previous Codex task
take a faster or cheaper pass with a smaller model

Note

Depending on the task and the model you choose these tasks might take a long time and it's generally recommended to force the task to be in the background or move the agent to the background.

It supports --background, --wait, --resume, and --fresh. If you omit --resume and --fresh, the plugin can offer to continue the latest rescue thread for this repo.

Examples:

/codex:rescue investigate why the tests started failing
/codex:rescue fix the failing test with the smallest safe patch
/codex:rescue --resume apply the top fix from the last run
/codex:rescue --model gpt-5.4-mini --effort medium investigate the flaky integration test
/codex:rescue --model spark fix the issue quickly
/codex:rescue --background investigate the regression

You can also just ask for a task to be delegated to Codex:

Ask Codex to redesign the database connection to be more resilient.

Notes:

if you do not pass --model or --effort, Codex chooses its own defaults.
if you say spark, the plugin maps that to gpt-5.3-codex-spark
follow-up rescue requests can continue the latest Codex task in the repo

`/codex:status`

Shows running and recent Codex jobs for the current repository.

Examples:

/codex:status
/codex:status task-abc123

Use it to:

check progress on background work
see the latest completed job
confirm whether a task is still running

`/codex:result`

Shows the final stored Codex output for a finished job.
When available, it also includes the Codex session ID so you can reopen that run directly in Codex with codex resume <session-id>.

Examples:

/codex:result
/codex:result task-abc123

`/codex:cancel`

Cancels an active background Codex job.

Examples:

/codex:cancel
/codex:cancel task-abc123

`/codex:setup`

Checks whether Codex is installed and authenticated.
If Codex is missing and npm is available, it can offer to install Codex for you.

You can also use /codex:setup to manage the optional review gate.

Enabling review gate

/codex:setup --enable-review-gate
/codex:setup --disable-review-gate

When the review gate is enabled, the plugin uses a Stop hook to run a targeted Codex review based on Claude's response. If that review finds issues, the stop is blocked so Claude can address them first.

Warning

The review gate can create a long-running Claude/Codex loop and may drain usage limits quickly. Only enable it when you plan to actively monitor the session.

Typical Flows

Review Before Shipping

/codex:review

Hand A Problem To Codex

/codex:rescue investigate why the build is failing in CI

Start Something Long-Running

/codex:adversarial-review --background
/codex:rescue --background investigate the flaky test

Then check in with:

/codex:status
/codex:result

Codex Integration

The Codex plugin wraps the Codex app server. It uses the global codex binary installed in your environment and applies the same configuration.

Common Configurations

If you want to change the default reasoning effort or the default model that gets used by the plugin, you can define that inside your user-level or project-level config.toml. For example to always use gpt-5.4-mini on high for a specific project you can add the following to a .codex/config.toml file at the root of the directory you started Claude in:

model = "gpt-5.4-mini"
model_reasoning_effort = "xhigh"

Your configuration will be picked up based on:

user-level config in ~/.codex/config.toml
project-level overrides in .codex/config.toml
project-level overrides only load when the project is trusted

Check out the Codex docs for more configuration options.

Moving The Work Over To Codex

Delegated tasks and any stop gate run can also be directly resumed inside Codex by running codex resume either with the specific session ID you received from running /codex:result or /codex:status or by selecting it from the list.

This way you can review the Codex work or continue the work there.

FAQ

Do I need a separate Codex account for this plugin?

If you are already signed into Codex on this machine, that account should work immediately here too. This plugin uses your local Codex CLI authentication.

If you only use Claude Code today and have not used Codex yet, you will also need to sign in to Codex with either a ChatGPT account or an API key. Codex is available with your ChatGPT subscription, and codex login supports both ChatGPT and API key sign-in. Run /codex:setup to check whether Codex is ready, and use !codex login if it is not.

Does the plugin use a separate Codex runtime?

No. This plugin delegates through your local Codex CLI and Codex app server on the same machine.

That means:

it uses the same Codex install you would use directly
it uses the same local authentication state
it uses the same repository checkout and machine-local environment

Will it use the same Codex config I already have?

Yes. If you already use Codex, the plugin picks up the same configuration.

Can I keep using my current API key or base URL setup?

Yes. Because the plugin uses your local Codex CLI, your existing sign-in method and config still apply.

If you need to point the built-in OpenAI provider at a different endpoint, set openai_base_url in your Codex config.

docs(ultraplan): handoff §4.4 current limitations + §5 B2 re-verifica…

fix(plugin): close upstream OPEN backlog — openai#59 state migration, o…

Merge pull request #7: close upstream OPEN backlog (openai#59 / opena…

docs(changelog): sync Unreleased with PR #3-#8

I could not reproduce this; it is an install-time error. Could you retry on the fork v1.4.1 (https://github.com/CBEPX/codex-plugin-cc/releases/tag/v1.4.1) with /plugin marketplace add CBEPX/codex-plugin-cc and /plugin install codex@cbepx? If it still fails, please report the exact error text (screenshot or raw bytes if garbled), your OS and console code page, codex --version, and the /codex:status --json output if the plugin loads.

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Plugin install fails on Windows with corrupted error message #113

Codex plugin for Claude Code

What You Get

Requirements

Install

Usage

`/codex:review`

`/codex:adversarial-review`

`/codex:rescue`

`/codex:status`

`/codex:result`

`/codex:cancel`

`/codex:setup`

Enabling review gate

Typical Flows

Review Before Shipping

Hand A Problem To Codex

Start Something Long-Running

Codex Integration

Common Configurations

Moving The Work Over To Codex

FAQ

Do I need a separate Codex account for this plugin?

Does the plugin use a separate Codex runtime?

Will it use the same Codex config I already have?

Can I keep using my current API key or base URL setup?

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Plugin install fails on Windows with corrupted error message #113

Description

Activity

terad-alrowes commented on Apr 2, 2026

terad-alrowes commented on Apr 2, 2026

terad-alrowes commented on Apr 2, 2026

Codex plugin for Claude Code

What You Get

Requirements

Install

Usage

/codex:review

/codex:adversarial-review

/codex:rescue

/codex:status

/codex:result

/codex:cancel

/codex:setup

Enabling review gate

Typical Flows

Review Before Shipping

Hand A Problem To Codex

Start Something Long-Running

Codex Integration

Common Configurations

Moving The Work Over To Codex

FAQ

Do I need a separate Codex account for this plugin?

Does the plugin use a separate Codex runtime?

Will it use the same Codex config I already have?

Can I keep using my current API key or base URL setup?

CBEPX commented on Sep 29, 2026

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

`/codex:review`

`/codex:adversarial-review`

`/codex:rescue`

`/codex:status`

`/codex:result`

`/codex:cancel`

`/codex:setup`