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When using a non-built-in provider with the `--provider` option, users are prompted: ``` Set the environment variable <provider>_API_KEY and re-run this command. You can create a <provider>_API_KEY in the <provider> dashboard. ``` However, many users are confused because, even after correctly setting `<provider>_API_KEY`, authentication may still fail unless `OPENAI_API_KEY` is _also_ present in the environment. This is not intuitive and leads to ambiguity about which API key is actually required and used as a fallback, especially when using custom or third-party (non-listed) providers. Furthermore, the original README/documentation did not mention the requirement to set `<provider>_BASE_URL` for non-built-in providers, which is necessary for proper client behavior. This omission made the configuration process more difficult for users trying to integrate with custom endpoints.