Vapi simulations: test for every type of caller

Vapi Simulations is a native AI-powered testing feature for voice agents that uses configurable AI callers with distinct personalities and realistic scenarios to hold conversations with agents before deployment. Each test produces pass-or-fail results, transcripts, recordings, and structured evaluations, helping teams identify conversational failures and regressions that manual testing or scripted evaluations may miss. Users can create personalities, scenarios, individual simulations, and reusable test suites, while tool mocks enable testing of API errors or timeouts without affecting live systems. Chat mode supports rapid, lower-cost text testing, while voice mode validates the complete audio experience, and API integration allows quality gates to block deployments when test performance declines. The feature is intended to help teams validate launches, prevent regressions, verify compliance guardrails, and test difficult failure conditions such as unavailable appointments or calendar-service failures.

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