supermemory/packages/cartesia-sdk-python

Supermemory Cartesia SDK

Memory-enhanced voice agents with Supermemory and Cartesia Line.

Installation

pip install supermemory-cartesia

Quick Start

import os
from line.llm_agent import LlmAgent, LlmConfig
from line.voice_agent_app import VoiceAgentApp
from supermemory_cartesia import SupermemoryCartesiaAgent

async def get_agent(env, call_request):
    # Extract container_tag from call metadata (typically user ID)
    container_tag = call_request.metadata.get("user_id", "default-user")

    # Create base LLM agent
    base_agent = LlmAgent(
        model="gemini/gemini-2.5-flash-preview-09-2025",
        config=LlmConfig(
            system_prompt="You are a helpful voice assistant with memory.",
            introduction="Hello! Great to talk with you again!"
        )
    )

    # Wrap with Supermemory
    memory_agent = SupermemoryCartesiaAgent(
        agent=base_agent,
        api_key=os.getenv("SUPERMEMORY_API_KEY"),
        container_tag=container_tag,
        custom_id=call_request.call_id,
    )

    return memory_agent

# Create voice agent app
app = VoiceAgentApp(get_agent=get_agent)

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8000)

Configuration

Parameters

Parameter	Type	Required	Description
agent	LlmAgent	Yes	The Cartesia Line agent to wrap
container_tag	str	Yes	Primary container tag for memory scoping (e.g., user ID)
custom_id	str	Yes	Custom ID for grouping conversation messages into a single document
add_memory	Literal	No	Memory persistence mode: "always" (default) or "never"
container_tags	List[str]	No	Additional container tags for organization (e.g., ["org", "prod"])
api_key	str	No	Supermemory API key (or set SUPERMEMORY_API_KEY env var)
config	MemoryConfig	No	Advanced configuration
base_url	str	No	Custom API endpoint

Advanced Configuration

from supermemory_cartesia import SupermemoryCartesiaAgent

memory_agent = SupermemoryCartesiaAgent(
    agent=base_agent,
    container_tag="user-123",
    custom_id="conversation-456",
    add_memory="always",           # "always" (default) or "never"
    container_tags=["org-acme", "prod"],  # Optional: additional tags
    config=SupermemoryCartesiaAgent.MemoryConfig(
        search_limit=10,           # Max memories to retrieve
        search_threshold=0.1,      # Similarity threshold
        mode="full",               # "profile", "query", or "full"
        system_prompt="Based on previous conversations, I recall:\n\n",
    ),
)

# Read-only mode - retrieve memories but don't save new ones
read_only_agent = SupermemoryCartesiaAgent(
    agent=base_agent,
    container_tag="user-123",
    custom_id="conversation-456",
    add_memory="never",  # Only retrieve, don't save
)

Memory Modes

Mode	Static Profile	Dynamic Profile	Search Results
"profile"	Yes	Yes	No
"query"	No	No	Yes
"full"	Yes	Yes	Yes

How It Works

1. Intercepts events - Listens for UserTurnEnded events from Cartesia Line
2. Retrieves memories - Queries Supermemory /v4/profile API with user's message
3. Enriches context - Adds memories to event history as system message
4. Stores messages - Sends conversation to Supermemory (background, non-blocking)
5. Passes to agent - Forwards enriched event to wrapped LlmAgent

What Gets Stored

User and assistant messages are sent to Supermemory:

{
  "content": "User: What's the weather?\nAssistant: It's sunny today!",
  "container_tags": ["user-123", "org-acme", "prod"],
  "metadata": { "platform": "cartesia" }
}

Architecture

Cartesia Line uses an event-driven architecture:

User Speaks (Audio)
    ↓
[Ink STT] → Automatic speech recognition
    ↓
UserTurnEnded Event {content: "user message", history: [...]}
    ↓
┌──────────────────────────────────────────────┐
│   SUPERMEMORY CARTESIA AGENT (Wrapper)       │
│                                              │
│  process(env, event):                        │
│    1. Intercept UserTurnEnded                │
│    2. Extract user message                   │
│    3. Query Supermemory API                  │
│    4. Enrich event.history with memories     │
│    5. Pass to wrapped LlmAgent               │
│    6. Store conversation (async background)  │
└──────────────────────────────────────────────┘
    ↓
AgentSendText Event {text: "response"}
    ↓
[Sonic TTS] → Ultra-fast speech synthesis
    ↓
Audio Output

Comparison with Pipecat SDK

Aspect	Pipecat	Cartesia Line
Integration Pattern	Extends FrameProcessor	Wrapper around LlmAgent
Event Handling	process_frame() method	process() method
Events	LLMContextFrame, LLMMessagesFrame	UserTurnEnded, CallStarted
Context Object	LLMContext.get_messages()	event.history
Memory Injection	Modify context.add_message()	Modify event.history

Full Example with Tools

import os
from line.llm_agent import LlmAgent, LlmConfig
from line.tools import LoopbackTool
from line.voice_agent_app import VoiceAgentApp
from supermemory_cartesia import SupermemoryCartesiaAgent

# Define custom tools
async def get_weather(location: str) -> str:
    return f"The weather in {location} is sunny, 72°F"

weather_tool = LoopbackTool(
    name="get_weather",
    description="Get current weather for a location",
    function=get_weather
)

async def get_agent(env, call_request):
    container_tag = call_request.metadata.get("user_id", "default-user")
    org_id = call_request.metadata.get("org_id")

    # Create LLM agent with tools
    base_agent = LlmAgent(
        model="gemini/gemini-2.5-flash-preview-09-2025",
        tools=[weather_tool],
        config=LlmConfig(
            system_prompt="You are a personal assistant with memory and tools.",
            introduction="Hi! How can I help you today?"
        )
    )

    # Wrap with Supermemory
    memory_agent = SupermemoryCartesiaAgent(
        agent=base_agent,
        api_key=os.getenv("SUPERMEMORY_API_KEY"),
        container_tag=container_tag,
        custom_id=call_request.call_id,
        container_tags=[org_id] if org_id else None,
        config=SupermemoryCartesiaAgent.MemoryConfig(
            mode="full",
            search_limit=15,
            search_threshold=0.15,
        )
    )

    return memory_agent

app = VoiceAgentApp(get_agent=get_agent)

Development

# Clone repository
git clone https://github.com/supermemoryai/supermemory
cd supermemory/packages/cartesia-sdk-python

# Install in development mode
pip install -e ".[dev]"

# Run tests
pytest

# Format code
black .
isort .

License

MIT