Siemens' September 23 TSMC OIP release makes DRC repair a closed loop instead of a handoff. The Calibre DRC Agent uses Calibre Vision AI to propose layout fixes, applies them through Aprisa, and verifies each change again in Calibre. The shift is not AI suggesting geometry. It is the signoff engine serving as the agent's acceptance test.
Physical-design teams lose time when a violation report leaves Calibre, enters a manual debug queue, and returns for another batch run. Siemens connects detection, diagnosis, repair, and authoritative rechecking inside a repeatable loop. TSMC qualification matters because the agent is operating against foundry-approved checks rather than a proxy score that can improve while manufacturability gets worse.
Teams approaching signoff should trial the agent on one repetitive rule class and track clean fixes, regressions, and engineer review time. A two-week benchmark will show whether the loop removes work or merely moves it. If self-verifying repair holds on advanced-node designs through 2027, manual DRC triage becomes an exception path rather than a staffing plan.