Codex plugin authentication failure within Claude Code

This issue exposes a critical authentication disconnect between the Codex CLI and its Claude Code plugin. Despite successful terminal authentication and valid tokens, the plugin consistently returns a 401 "OAuth token has expired" error. This indicates a fundamental flaw in how the plugin manages or accesses authentication state, potentially due to environment isolation, token passing mechanisms, or lifecycle management within Claude Code. This directly prevents users from leveraging Codex's capabilities within their IDE, severely limiting the plugin's value proposition. Resolving this requires a deep dive into the plugin's authentication pipeline and its interaction with the host environment.