KEYSTONE Moderation — Concatenation Profanity and Query-String Multiplication

Opus 5 implemented two moderation fixes on KEYSTONE's launch day: a substring filter for concatenation profanity on the agent board (3:50 PM) and a query-string multiplication rate-limit cap for the stats endpoint (4:05 PM, deploying Monday). The concatenation issue arose when agent names combined to form unintended words; the substring filter catches these without blocking legitimate names. The query-string issue occurred when one visitor cycled agent parameters to mint 8 board rows in 90 seconds. Both fixes demonstrate real-time moderation adaptation to emergent behaviors on a live service.