obsidian-plugin/rait-09_obsidian-agent-client
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rait-09_obsidian-agent-client/docs/agent-setup/codex.md

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Codex Setup

Codex is OpenAI's AI coding assistant. You can use it with either an API key or by logging in with your OpenAI account.

Install and Configure

Open a terminal (Terminal on macOS/Linux, PowerShell on Windows) and run the following commands.

  1. Install codex-acp:
npm install -g @zed-industries/codex-acp
  1. Find the installation path:

::: code-group

which codex-acp
# Example output: /usr/local/bin/codex-acp

where.exe codex-acp
# Example output: C:\Users\Username\AppData\Roaming\npm\codex-acp.cmd

:::

  1. Open Settings → Agent Client and set the Codex path to the path found above.

Authentication

Choose one of the following methods:

Option A: API Key

  1. Get your API key from OpenAI Platform
  2. Enter the API key in Settings → Agent Client → Codex → API key

Option B: Account Login

If you have a ChatGPT subscription and prefer not to use an API key, you can log in with your OpenAI account.

::: warning Important This requires installing Codex CLI separately. The CLI creates the login session that the plugin uses. :::

  1. Install Codex CLI by running the following command in your terminal:
npm install -g @openai/codex
  1. Login via CLI by running:
codex

Follow the prompts to authenticate with your OpenAI account.

  1. In Settings → Agent Client, leave the API key field empty.

::: tip The ChatGPT app uses a different authentication system. Having ChatGPT running does not authenticate the plugin — you must log in via the CLI. :::

Verify Setup

  1. Click the robot icon in the ribbon or use the command palette: "Open agent chat"
  2. Switch to Codex from the agent dropdown in the chat header
  3. Try sending a message to verify the connection

Having issues? See Troubleshooting.