• OpenAI Codex plugin (#445 by @darkweb19, closes #295): .codex-plugin/plugin.json plus a marketplace at .agents/plugins/marketplace.json. Install with codex plugin marketplace add coreyhaines31/marketingskills, then /plugins, and update with codex plugin marketplace upgrade. It uses the Codex compatibility layout OpenAI's plugin creator scaffolds. scripts/check-versions.mjs now requires the Codex manifest's version to match the repo version so the two can't drift.
• Non-interactive installs (#339 by @SilviaMogas): the README notes that /plugin only works in an interactive Claude Code session, and gives npx skills and the claude plugin marketplace add / claude plugin install CLI commands as alternatives.