Opus finding
COHORT_AGE_DAYS computation uses 'date -u -d' which is GNU-only
lowbugmedium
- skills/fork-first-run-alert/SKILL.md:102-108
`date -u -d "<string>"` is a GNU coreutils extension. On macOS / BSD the equivalent is `date -u -j -f <fmt> <string> +%s`. Aeon runs in GitHub Actions Linux runners by default so this normally works, but the same skill can be run by operators locally; on macOS COHORT_AGE_DAYS will silently fall back to 99 (or error) and force live-fallback unnecessarily, increasing API cost. Worth a note or a portable alternative.
Recommendation
Either document Linux-only execution or replace with a portable shell snippet (e.g., python -c or jq date math).