iRules Debugging Tools ?

Welcome cxcal. I don't think so, personally I usually use log statements to debug rules. For example:

log "Running.  Client: " + client_addr + " Host: " + http_host + " URI: " + http_uri
if (http_host == "daleiscool") {
   log "Client " + client_addr + " sent to spool"
   use pool spool
}
else {
   log "Client " + client_addr + " request discarded"
   discard
}

Then after I hit it, I look over in /var/log/bigip and see logs like this

Oct 24 18:01:13 464-1 kernel: RULE test_rule - Running. Client: 192.168.0.69 Host: dalearecool URI: /gtmtracker/report.rb

Oct 24 18:01:13 464-1 kernel: RULE test_rule - Client 192.168.0.69 request discarded

Or this

Oct 24 18:00:59 464-1 kernel: RULE test_rule - Running. Client: 192.168.0.69 Host: daleiscool URI: /gtmtracker/report.rb

Oct 24 18:00:59 464-1 kernel: RULE test_rule - Client 192.168.0.69 sent to spool

- Dale