---
title: "Cartesia"
sidebarTitle: "Cartesia (Voice)"
description: "Integrate Supermemory with Cartesia for conversational memory in voice AI agents"
icon: "/images/cartesia.svg"
---

Supermemory integrates with [Cartesia](https://cartesia.ai/agents), providing long-term memory capabilities for voice AI agents. Your Cartesia applications will remember past conversations and provide personalized responses based on user history.

## Installation

To use Supermemory with Cartesia, install the required dependencies:

```bash
pip install supermemory-cartesia
```

Set up your API key as an environment variable:

```bash
export SUPERMEMORY_API_KEY=your_supermemory_api_key
```

You can obtain an API key from [console.supermemory.ai](https://console.supermemory.ai).

## Configuration

Supermemory integration is provided through the `SupermemoryCartesiaAgent` wrapper class:

```python
from supermemory_cartesia import SupermemoryCartesiaAgent
from line.llm_agent import LlmAgent, LlmConfig

# Create base LLM agent
base_agent = LlmAgent(
    model="anthropic/claude-haiku-4-5-20251001",
    api_key=os.getenv("ANTHROPIC_API_KEY"),
    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="user-123",
    custom_id="session-456",  # Required: groups all messages in same document
    config=SupermemoryCartesiaAgent.MemoryConfig(
        mode="full",            # "profile" | "query" | "full"
        search_limit=10,        # Max memories to retrieve
        search_threshold=0.3,   # Relevance threshold (0.0-1.0)
    ),
)
```

## Agent Wrapper Pattern

The `SupermemoryCartesiaAgent` wraps your existing `LlmAgent` to add memory capabilities:

```python
from line.voice_agent_app import VoiceAgentApp

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 agent
    base_agent = LlmAgent(...)

    # Wrap with memory
    memory_agent = SupermemoryCartesiaAgent(
        agent=base_agent,
        container_tag=container_tag,
        custom_id=call_request.call_id,  # Required: groups all messages in same document
    )

    return memory_agent

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

## How It Works

When integrated with Cartesia Line, Supermemory provides two key functionalities:

### 1. Memory Retrieval

When a `UserTurnEnded` event is detected, Supermemory retrieves relevant memories:

- **Static Profile**: Persistent facts about the user
- **Dynamic Profile**: Recent context and preferences
- **Search Results**: Semantically relevant past memories

### 2. Context Enhancement

Retrieved memories are formatted and injected into the agent's system prompt before processing, giving the model awareness of past conversations.

### 3. Background Storage

Conversations are automatically stored in Supermemory (non-blocking) for future retrieval.

## Memory Modes

| Mode        | Static Profile | Dynamic Profile | Search Results | Use Case                       |
| ----------- | -------------- | --------------- | -------------- | ------------------------------ |
| `"profile"` | Yes            | Yes             | No             | Personalization without search |
| `"query"`   | No             | No              | Yes            | Finding relevant past context  |
| `"full"`    | Yes            | Yes             | Yes            | Complete memory (default)      |

## Configuration Options

You can customize how memories are retrieved and used:

### MemoryConfig

```python
SupermemoryCartesiaAgent.MemoryConfig(
    mode="full",               # Memory mode (default: "full")
    search_limit=10,           # Max memories to retrieve (default: 10)
    search_threshold=0.1,      # Similarity threshold 0.0-1.0 (default: 0.1)
    system_prompt="Based on previous conversations:\n\n",
)
```

| Parameter          | Type  | Default                                | Description                                                |
| ------------------ | ----- | -------------------------------------- | ---------------------------------------------------------- |
| `search_limit`     | int   | 10                                     | Maximum number of memories to retrieve per query           |
| `search_threshold` | float | 0.1                                    | Minimum similarity threshold for memory retrieval          |
| `mode`             | str   | "full"                                 | Memory retrieval mode: `"profile"`, `"query"`, or `"full"` |
| `system_prompt`    | str   | "Based on previous conversations:\n\n" | Prefix text for memory context                             |

### Agent Parameters

```python
SupermemoryCartesiaAgent(
    agent=base_agent,           # Required: Cartesia Line LlmAgent
    container_tag="user-123",   # Required: Primary container tag (e.g., user ID)
    custom_id="session-456",    # Required: Groups all messages in same document
    add_memory="always",        # Optional: "always" (default) or "never"
    container_tags=["org-acme", "prod"],  # Optional: Additional tags
    api_key=os.getenv("SUPERMEMORY_API_KEY"),  # Optional: defaults to env var
    config=MemoryConfig(...),   # Optional: memory configuration
    base_url=None,              # Optional: custom API endpoint
)
```

| 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**  | Groups all messages in the same document (e.g., call ID, conversation ID) |
| `add_memory`    | str          | 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                                                |

## Container Tags

Container tags allow you to organize memories across multiple dimensions:

```python
memory_agent = SupermemoryCartesiaAgent(
    agent=base_agent,
    container_tag="user-alice",           # Primary: user ID
    container_tags=["org-acme", "prod"],  # Additional: organization, environment
)
```

Memories are stored with all tags:
```json
{
  "content": "User: What's the weather?\nAssistant: It's sunny today!",
  "container_tags": ["user-alice", "org-acme", "prod"],
  "metadata": { "platform": "cartesia" }
}
```

## Automatic Document Grouping

The SDK **automatically groups all messages from the same conversation** into a single Supermemory document using `custom_id`:

```python
memory_agent = SupermemoryCartesiaAgent(
    agent=base_agent,
    container_tag="user-alice",
    custom_id=call_request.call_id,  # Required: Groups all messages together
)
```

**How it works:**
- The `custom_id` parameter groups all messages into the same Supermemory document
- Typically you use the call ID or conversation ID from Cartesia
- All messages from that conversation are appended to the same document
- This ensures conversation continuity and proper memory generation

## Example: Basic Voice Agent with Memory

Here's a complete example of a Cartesia Line voice agent with Supermemory integration:

```python
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="anthropic/claude-haiku-4-5-20251001",
        api_key=os.getenv("ANTHROPIC_API_KEY"),
        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,  # Required: Groups all messages
    )

    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)
```

## Example: Advanced Agent with Tools

Here's an example with custom tools and multi-tag support:

```python
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 tool
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,  # Required: Groups all messages
        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)
```

## Deployment

To deploy to Cartesia Line, create a `main.py` file in your project root:

```python
import os
import sys

# Add src to path for local imports
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "src"))

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):
    """Create a memory-enabled voice agent."""
    container_tag = call_request.metadata.get("user_id", "default-user")

    base_agent = LlmAgent(
        model="anthropic/claude-haiku-4-5-20251001",
        api_key=os.getenv("ANTHROPIC_API_KEY"),
        config=LlmConfig(
            system_prompt="""You are a helpful voice assistant with memory.
            You remember past conversations and can reference them naturally.
            Keep responses brief and conversational.""",
            introduction="Hello! Great to talk with you again!",
        ),
    )

    memory_agent = SupermemoryCartesiaAgent(
        agent=base_agent,
        api_key=os.getenv("SUPERMEMORY_API_KEY"),
        container_tag=container_tag,
        custom_id=call_request.call_id,  # Required: Groups all messages
    )

    return memory_agent

app = VoiceAgentApp(get_agent=get_agent)
```

Then deploy with:

```bash
cartesia deploy
```

Make sure to set these environment variables in your Cartesia deployment:
- `SUPERMEMORY_API_KEY` - Your Supermemory API key
- `ANTHROPIC_API_KEY` - Your Anthropic API key (or the key for your chosen LLM provider)