The ChatGPT Codex desktop app keeps a 1.7 GB runtime cache holding Python, Node.js, git, Poppler and LibreOffice

Sources: primary, discussion
Summary: Simon Willison's note reports that the ChatGPT Codex desktop application keeps a runtime cache of about 1.7 GB under ~/.cache, holding Python, Node.js, git, Poppler and LibreOffice. He reports the binaries sit beside skill files that tell the agent how to find and run them.
Why it matters: The local execution surface of a coding agent includes a full office suite and two language runtimes that the user never installed and did not choose.
Follow-up: Track whether OpenAI documents the bundled runtime set or makes it removable.