Everything doctor checks compares copies already on the machine, deliberately — it runs in a SessionStart hook where latency shows, and its header promises no network I/O. That leaves exactly one case invisible, and #30 walked straight into it: a host whose checkout, marketplace clone and installed plugin all agree reads as clean while all three sit a release behind origin. `--online` closes it with one `git ls-remote`, opt-in, for a scheduled per-host job rather than the session hook. Comparison is by order, not equality, so a host ahead of the newest tag — normal between a release commit and its tag — stays quiet. An unreachable remote is a WARN naming itself, not a staleness FAIL. "I could not check" and "you are behind" are different answers, and collapsing them would make a network blip look like a stale library. The remote URL is never printed: a remote rewritten by url.insteadOf expands into a live token, which is a documented way this fleet has leaked one before. Five fixture cases through a $DOCTOR_LATEST_TAG_CMD seam, including one that asserts the DEFAULT run performs no lookup at all — the promise in the header is now a test, not a comment. Verified live on koala: $ bin/doctor --online FAIL behind: this host has 0.12.1; origin has released 0.13.4 $ bin/doctor skills doctor: clean — 41 skills Closes #38 Bump-Type: minor