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Fish Audio provides speech-to-text with automatic language detection. Buffers audio per participant (minimum 1 second) before sending to the API for accurate transcription.
Vision Agents requires a Stream account for real-time transport. Most providers offer free tiers to get started.
Fish Audio also provides high-quality text-to-speech with prosody control and voice cloning. You can use both in the same agent.

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Installation

uv add "vision-agents[fish]"

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Quick Start

from vision_agents.core import Agent, User
from vision_agents.plugins import fish, gemini, 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=fish.STT(),
    tts=fish.TTS(),
)
Set FISH_API_KEY in your environment or pass api_key directly.

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Parameters

stt = fish.STT(language="en")  # Or None for auto-detection
NameTypeDefaultDescription
languagestrNoneLanguage code ("en", "zh", etc.) or None for auto-detect
api_keystrNoneAPI key (defaults to FISH_API_KEY env var)

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Next Steps

Fish Audio TTS

Text-to-speech with prosody control

Build a Voice Agent

Get started with voice