> ## Documentation Index > Fetch the complete documentation index at: https://docs.cartesia.ai/llms.txt > Use this file to discover all available pages before exploring further. # Introduction > Create and run realtime voice agents with Cartesia. Cartesia Managed Agents combine [Ink-2](/build-with-cartesia/stt/latest), an LLM you choose, and [Sonic-3.6](/build-with-cartesia/tts-models/latest) in a realtime voice agent. Your agent handles turn-taking and interruptions, streams audio, and can use tools during a conversation. Create and test an agent in the [Playground](https://play.cartesia.ai/agents), or manage the same agents through the [API](/api-reference/agents/create). Connect it to your application over WebSocket or give it a phone number. Agent configuration page in the Playground showing instructions, welcome message, voice, and LLM settings ## Explore Set instructions, language, voice, and audio behavior. Choose an LLM and generation settings. Add built-in actions, webhooks, and client functions. Inspect configuration history and restore an earlier version. Stream audio from an application or connect a phone number. Measure call quality with built-in and custom metrics.