Claude Code Skills pattern adopted cross-platform — OpenAI implements in ChatGPT and Codex¶
Insight: OpenAI has adopted Anthropic's Skills mechanism in both ChatGPT's Code Interpreter and Codex CLI, with a /home/oai/skills folder mirroring Anthropic's approach. Skills — folders containing Markdown instructions with optional scripts — are becoming a cross-platform pattern for making AI tools more capable. The approach works because any LLM tool with filesystem access can use them, making implementation trivially easy for other platforms.
Detail: OpenAI's initial skills cover spreadsheets, docx, and PDFs. Their PDF approach converts to per-page PNGs using vision models to preserve layout information. This convergence validates Skills as an emerging standard for context engineering, not just an Anthropic-specific feature.