openai-codex-app-server (OpenAI Codex App Server Examples)

These examples evaluate Codex through the experimental codex app-server protocol.

Setup

Install and sign in to Codex:

npm i -g @openai/codex
codex

You can also use an API key:

export OPENAI_API_KEY=your_api_key_here

Run

From this repository:

npm run local -- eval -c examples/openai-codex-app-server/promptfooconfig.yaml --no-cache

With an .env file:

npm run local -- eval -c examples/openai-codex-app-server/promptfooconfig.yaml --env-file .env --no-cache

If you initialized this example separately:

npx promptfoo@latest init --example openai-codex-app-server
cd openai-codex-app-server
npx promptfoo@latest eval -c promptfooconfig.yaml --no-cache

Included Configs

• promptfooconfig.yaml - Read-only structured repo summary.
• approval-policy/promptfooconfig.yaml - Demonstrates deterministic approval request handling.
• review-diff/promptfooconfig.yaml - Uses Codex app-server to review the current git diff.
• skills/promptfooconfig.yaml - Demonstrates explicit skill input items.

The skills config expects CODEX_SKILL_CREATOR_PATH to point at a local skill-creator/SKILL.md file.

Notes

The provider starts its own codex app-server process. It does not attach to an already-running Codex Desktop app process.

The default examples use:

• sandbox_mode: read-only
• approval_policy: never
• skip_git_repo_check: true
• thread_cleanup: unsubscribe

See OpenAI Codex App Server Provider Documentation for full configuration details.