Kokoro

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.

Installation

uv add "vision-agents[kokoro]"

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.

Parameters

Name	Type	Default	Description
voice	str	"af_heart"	Voice preset
lang_code	str	"a"	Language code ("a" = American English)
speed	float	1.0	Playback speed (e.g., 0.9 slower, 1.2 faster)
device	str	None	Device ("cuda", "cpu", or auto-detect)

Next Steps

Build a Voice Agent

Get started with voice

Build a Video Agent

Add video processing