- Any session operation that hits 404/410 (or finds no open tab) reconciles
tabs; if none survive it re-injects the account cookies (BR-2), opens a new
tab under the same userId/sessionKey, returns to the recorded URL (site home
otherwise), marks old tabs lost and retries the operation once. Failure
returns 503 browser_reconnect_failed with the reason, with a 10s backoff.
- Restart detection: umt plugin GET /umt/instance (fallback /health fields);
a changed instance id marks every open session needsReconnect.
- POST /browser/sessions/{id}/reconnect (idempotent); session view exposes
needsReconnect and reconnect {status, trigger, at, reason, humanNotice}.
- Controller and lease are kept; reconnecting during takeover asks the human
to double-check the reloaded page.
- Web: screenshot and desktop modes show "reconnecting", auto-reconnect once,
pause polling, offer a reconnect button with the reason on failure; desktop
mode rebuilds the Selkies connection after a reconnect.
- Mock camofox restart(), tests, smoke step and runbook section 10.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
