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Kokoro is a local TTS engine that runs entirely on your machine. No API key or internet connection required. Ideal for offline voice synthesis, privacy-sensitive applications, or prototyping.
Vision Agents uses Stream Video for real-time WebRTC transport by default. External WebRTC transports are supported as well. Most AI providers offer free tiers to get started.

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Installation

uv add "vision-agents[kokoro]"

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Quick Start

from vision_agents.core import Agent, User
from vision_agents.plugins import kokoro, gemini, deepgram, getstream

agent = Agent(
    edge=getstream.Edge(),
    agent_user=User(name="Assistant", id="agent"),
    instructions="You are a helpful assistant.",
    llm=gemini.LLM("gemini-3-flash-preview"),
    stt=deepgram.STT(),
    tts=kokoro.TTS(),
)
Kokoro runs locally. No API key or internet connection is required.

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Parameters

NameTypeDefaultDescription
voicestr"af_heart"Voice preset
lang_codestr"a"Language code ("a" = American English)
speedfloat1.0Playback speed (e.g., 0.9 slower, 1.2 faster)
devicestrNoneDevice ("cuda", "cpu", or auto-detect)

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Next Steps

Build a Voice Agent

Get started with voice

Build a Video Agent

Add video processing