set ctcp-mode 0
Set here how the ctcp module should answer ctcps. There are 3 possible operating modes:
0 Normal behavior is used.
1 The bot ignores all ctcps, except for CHAT and PING requests by users with the +o flag.
2 Normal behavior is used, however the bot will not answer more than X ctcps in Y seconds (defined by 'set flood-ctcp').
There are also several variables to help make your bot less noticeable. They are: ctcp-version, ctcp-finger, and ctcp-userinfo. You can use set to set them to values you'd like.
In addition to YooHoo's suggestions, you might also choose to not load the ctcp-module at all, and thus disable any native ctcp-support. However, setting ctcp-mode to 1 should be sufficient for most users...