Artefact

A visualization tool: one concept → one self-contained HTML file → opened in the user's browser.

Produce the file

1. Resolve the temp directory: $TMPDIR, falling back to /tmp (%TEMP% on Windows).
2. Write a single HTML file to <tmpdir>/<concept-slug>-<timestamp>.html — a fresh file per run, nothing lands in the repo.
3. Open it for the user: xdg-open <path> on Linux, open <path> on macOS, start <path> on Windows. On WSL, use explorer.exe "$(wslpath -w <path>)".
4. Tell the user the absolute path, so they can reopen or share it.

Done when: the file is written, opened (or the open command failed and you said so), and the path is in your reply.

Scaffold