Set up Kabuken in ChatGPT and Codex

What you need

• A Kabuken account. Sign in or sign up.
• The ChatGPT desktop app or Codex.
• ChatGPT on the web and on mobile is not available yet. Use the ChatGPT desktop app or Codex.
• Sign-in method: OAuth with the plugin or with codex mcp login. Use the key variable for headless Codex runs.

Sign in with OAuth

ChatGPT desktop app and Codex: plugin

1. Download the plugin file: kabuken-plugin.zip.
2. In the ChatGPT desktop app or Codex, open Plugins and select +.
3. Choose Create custom MCP server and upload the file.
4. Sign in to Kabuken when asked.

Codex: configuration file

Codex reads MCP servers from ~/.codex/config.toml, or from .codex/config.toml in a project. Add:

[mcp_servers.kabuken]
url = "https://kabuken.intellics.ai/mcp"

Then sign in:

codex mcp login kabuken

Use an API key

Create a kbk_ key on the Account page: in the API Access section, select Generate Key.

In Codex, put the key in an environment variable and name that variable in the configuration:

[mcp_servers.kabuken]
url = "https://kabuken.intellics.ai/mcp"
bearer_token_env_var = "KABUKEN_API_KEY"

First prompt

Compare Toyota and Honda on revenue and operating income.

Troubleshooting

See Troubleshooting and Authentication.

Checked: 2026-10-29 against https://developers.openai.com/codex/mcp (Codex). The ChatGPT desktop app steps follow the plugin README at https://github.com/Intellics-ai/kabuken-mcp-plugin.