
Voice agents, demystified: STT+TTS and 4 demo agents you can talk to in the browser + build yours with RAG and Tools
I added voice to AgentSwarms! You can create voice agents using a few clicks and talk to it in the browser — and you can try 4 demo voice agents right now, no setup, just tap the mic. Here's how it works and why it turned out to be less "new" than I expected.
The surprise building this: a voice agent is basically the chat agent you already know, with a voice on top. Same system prompt, same tools, same RAG, memory, and guardrails. Under the hood it's a simple loop — your mic gets transcribed to text (OpenAI GPT-4o-mini-transcribe), your agent replies exactly like it would in chat, and that reply gets spoken back (OpenAI GPT-4o-mini-TTS). The agent's brain doesn't change at all. You've just added ears and a voice.
Which is the whole point: everything you've already learned building chat agents carries straight over. If your agent can pull an answer from a knowledge base, call a tool, or respect a guardrail in text, it does all of that out loud too — because it's the exact same engine with audio on the two ends, not a separate stripped-down "voice mode."
**What I shipped**
* **New Voice Agent** in the builder: pick a voice (11 of them), a greeting, and your STT/TTS models. That's the whole setup.
* Every spoken reply runs the same pipeline as a chat agent — tools, knowledge base, memory, and guardrails all apply.
* A **Voice Playground**: tap the mic, talk, and hear the reply back, with the transcript on screen so you can read along.
**Talk to it (free, in the browser)** — 4 demos, tap the mic:
* **Aria** — customer support triage
* **Nova** — B2B discovery caller
* **Kai** — Spanish conversation tutor
* **Echo** — daily standup coach
Open one, talk to it, and fork it into your own workspace if you like it.
* Voice Playground → [https://agentswarms.fyi/voice-playground\](https://agentswarms.fyi/voice-playground)
* Build your own (New Voice Agent) → [https://agentswarms.fyi/agents\](https://agentswarms.fyi/agents)
* Docs → [https://agentswarms.fyi/docs/voice\](https://agentswarms.fyi/docs/voice)
*Disclosure: AgentSwarms school of Agentic AI for both no-code people and developers— a learn-by-building platform. The demos are free. Happy to answer anything about the setup in the comments.*
