Hmm, that's strange. From my CLI:
rado@SRX03> request snmp ?
Possible completions:
spoof-trap Generate artificial SNMP notification
{primary:node0}
rado@SRX03> request snmp utility-mib
^
syntax error, expecting <command>.
{primary:node0}
rado@SRX03> show version
node0:
--------------------------------------------------------------------------
Hostname: SRX03
Model: srx3600
JUNOS Software Release [11.4R7.5]