obsidian-plugin/rait-09_obsidian-agent-client
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rait-09_obsidian-agent-client/docs/agent-setup/codex.md
RAIT-09 660d27710f refactor(agents): rename "Built-in agents" to "Preset agents" 
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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. The default command (codex-acp) works in many cases. If the agent is not found automatically, set the Codex path to the path found above, or click Auto-detect.

Authentication

Choose one of the following methods:

Option A: API Key

  1. Get your API key from OpenAI Platform
  2. Open Settings → Agent Client → Preset agents → Codex → API key
  3. Click the Link... button next to the API key field
  4. In the Select secret dialog:
    • To use an existing secret: select it from the list and click Save
    • To create a new one: click Add secret..., enter an ID (lowercase letters, numbers, and dashes only — e.g., openai-api-key), paste your API key, then click Save

Once linked, the field shows the masked secret value with a Change button to swap secrets.

::: tip Managing secrets API keys are stored in Obsidian's Keychain (Settings → Keychain). You can rename, edit, or delete secrets there at any time. The same secret can be shared across plugins by referencing the same ID. :::

::: info Upgrading from a previous version If you previously stored your OpenAI API key in this plugin (v0.10.x or earlier), it is automatically migrated to Obsidian's Keychain as openai-api-key the first time you load the upgraded plugin. A one-time notification confirms the migration.

If openai-api-key is already in use by another plugin with a different value, your key is preserved under agent-client-openai-api-key instead. You can rename it from Settings → Keychain if you prefer. :::

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 and Codex app use 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 chat view"
  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.