A `default` scan runs without -L, so the shim answers it from the inherited HERDR_SESSION_NAME; a create's reconcile --once labelled that server's panes `default`, and since create adopts only a row of its own server (1e25cf2f F2), parallel creates in one folder were refused (test_tier4_e2e scenario 4). The skill-blocks data follows create_session.sh's SystemExit line. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff