Codex (OpenAI)

Codex is OpenAI's autonomous software engineering agent available to ChatGPT Plus users. It supports MCP servers via a TOML configuration file.

Setup#

Add to ~/.codex/config.toml:

[mcp_servers.lingo]
command = "npx"
args = ["mcp-remote", "https://mcp.lingo.dev/main"]

No API key is needed.

Usage#

Prompt Codex:

Set up i18n

Or specify locales upfront:

Set up i18n with the following locales: en, es, and pt-BR. The default locale is "en".

Codex calls the i18n_checklist tool and follows the guided steps - analyzing your project, fetching framework docs, and implementing locale routing, translations, and a language switcher.

Next Steps#