# How to connect Cartesia to Claude

```json
{
  "title": "How to connect Cartesia to Claude",
  "toolkit": "Cartesia",
  "toolkit_slug": "cartesia",
  "framework": "Claude Cowork",
  "framework_slug": "claude-cowork",
  "url": "https://composio.dev/toolkits/cartesia/framework/claude-cowork",
  "markdown_url": "https://composio.dev/toolkits/cartesia/framework/claude-cowork.md",
  "updated_at": "2026-10-23T05:31:57.604Z"
}
```

## Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.
This guide walks you through the easiest and most secure way to connect your Cartesia account to Claude via Composio Connect, enabling it to convert text to speech with Cartesia, transcribe a Cartesia audio recording, generate Cartesia voice audio for demos, and more such actions on your behalf without compromising your account security.
Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

## Also integrate Cartesia with

- [ChatGPT](https://composio.dev/toolkits/cartesia/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/cartesia/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/cartesia/framework/atomic-agent)

## Connect Cartesia to Claude Cowork

### Connecting Cartesia to Claude Web, Desktop, and Cowork
Two ways to add the Composio connector. Pick whichever you prefer.
### 1. Add with one click
Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.
[Add to Claude](https://claude.ai/customize/connectors?modal=add-custom-connector&connectorName=Composio&connectorUrl=https%3A%2F%2Fconnect.composio.dev%2Fmcp)
### Add manually
In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.
Click Add custom connector and paste in the Composio MCP server URL:

```bash
https://connect.composio.dev/mcp
```

## What is the Cartesia MCP server, and what's possible with it?

The Cartesia MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Cartesia account. It provides structured and secure access to voice, speech synthesis, pronunciation dictionary, accent, and managed agent model capabilities, so your agent can generate audio from text, find suitable voices, check supported accents, manage pronunciation dictionaries, and review available agent models on your behalf.
- Text-to-speech generation: Have your agent turn a complete transcript into a downloadable audio file using a selected Cartesia voice.
- Voice discovery: Let the agent search Cartesia voices and retrieve synthesis details to help choose the right voice for an audio project.
- Accent exploration: Direct your agent to list supported accents and filter them by language, locale, or voice localization support.
- Pronunciation dictionary management: Instruct your agent to create, review, update, list, or delete reusable pronunciation dictionaries for more consistent speech generation.
- Managed agent model selection: Have your agent review available Cartesia managed agent models, including provider, latency, and pricing details.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `CARTESIA_CREATE_PRONUNCIATION_DICTIONARY` | Create Pronunciation Dictionary | Create a reusable pronunciation dictionary for text-to-speech generation. |
| `CARTESIA_DELETE_PRONUNCIATION_DICTIONARY` | Delete Pronunciation Dictionary | Permanently delete one pronunciation dictionary by ID. |
| `CARTESIA_GET_PRONUNCIATION_DICTIONARY` | Get Pronunciation Dictionary | Return one pronunciation dictionary and its complete text-to-pronunciation mappings. |
| `CARTESIA_GET_VOICE` | Get Voice | Return synthesis-relevant details for one Cartesia voice by ID. |
| `CARTESIA_LIST_ACCENTS` | List Accents | List supported accents, optionally filtered by language, locale, or voice-localization support. |
| `CARTESIA_LIST_AGENT_MODELS` | List Agent Models | List language models available to Cartesia Managed Agents, including provider, latency, and pricing metadata. |
| `CARTESIA_LIST_PRONUNCIATION_DICTIONARIES` | List Pronunciation Dictionaries | Return one page of pronunciation dictionaries available to the connected account. |
| `CARTESIA_LIST_VOICES` | List Voices | Search and filter Cartesia voices, returning one page of voice IDs and synthesis-relevant metadata. |
| `CARTESIA_SYNTHESIZE_SPEECH` | Synthesize Speech | Generate a downloadable audio file from one complete transcript using a selected Cartesia voice; usage is billed by transcript length. |
| `CARTESIA_UPDATE_PRONUNCIATION_DICTIONARY` | Update Pronunciation Dictionary | Update a pronunciation dictionary and replace its mappings with the complete supplied item set. |

## Supported Triggers

None listed.

## Troubleshooting

### 1. Why does Claude not use the Composio connector for Cartesia?

The connector can show as connected, but Claude must use it in each Cartesia conversation.
- Click + at the lower left of the chat, or type /.
- Hover Connectors.
- Turn on Composio.
- Ask Claude to connect to Cartesia again.

### 2. Why does Claude show an MCP server error before Cartesia connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Cartesia.
- Check that the connector URL is https://connect.composio.dev/mcp.
- Connectors run from Anthropic's cloud, so your device network is usually not the problem.
- Add the connector again from Customize > Connectors, then ask Claude to connect Cartesia.
- If it fails again, send the error and the ofid_ reference id to support@composio.dev.

### 3. Why does the Cartesia authorization link not work?

The Composio connector is one server. Your Cartesia account connects separately when Claude asks for it.
- If the browser does not open, or the link expires, ask Claude to retry the Cartesia connection.
- Composio creates a fresh Cartesia authorization link.
- Open that link in your browser and finish the Cartesia sign-in.

### 4. Why do Cartesia actions fail after they worked before?

The Cartesia connection can expire or lose permission.
- Ask Claude to inspect the Cartesia connection.
- If the connection is unhealthy, disconnect it when Claude prompts you.
- Reconnect the Cartesia account and retry the action.
- If Claude shows a permission prompt, approve it before Claude changes data in Cartesia.
- If the action still fails with a permission error, check that the connected account has that permission in Cartesia itself.

### 5. How do I switch to a different Cartesia account?

Claude can manage the Cartesia connection for you.
- Ask Claude to disconnect or delete the current Cartesia account.
- Ask Claude to connect Cartesia again.
- Open the new Composio authorization link for Cartesia.
- Sign in with the other Cartesia account in the browser.
- After the account connects, ask Claude to retry the Cartesia task.

### 6. Why is my Cartesia connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Cartesia connection works in Claude Web, Desktop, and Cowork.
- In Claude Desktop, open Customize > Connectors.
- Next to Composio, click ⋮ and click Clear cache.
- If Cartesia tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
- On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Cartesia.

## Creating MCP Server - Stand-alone vs Composio SDK

The Cartesia MCP server connects Claude Web, Desktop, and Cowork to your Cartesia account through Composio. Once connected, Claude can use the available Cartesia tools and triggers to complete tasks on your behalf.

## Complete Code

None listed.

## How to build Cartesia MCP Agent with another framework

- [ChatGPT](https://composio.dev/toolkits/cartesia/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/cartesia/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/cartesia/framework/atomic-agent)

## Related Toolkits

- [Composio](https://composio.dev/toolkits/composio) - Composio is an integration platform that connects AI agents with hundreds of business tools. It streamlines authentication and lets you trigger actions across services—no custom code needed.
- [Composio search](https://composio.dev/toolkits/composio_search) - Composio search is a unified web search toolkit spanning travel, e-commerce, news, financial markets, images, and more. It lets you and your apps tap into up-to-date web data from a single, easy-to-integrate service.
- [Perplexityai](https://composio.dev/toolkits/perplexityai) - Perplexityai delivers natural, conversational AI models for generating human-like text. Instantly get context-aware, high-quality responses for chat, search, or complex workflows.
- [Browser tool](https://composio.dev/toolkits/browser_tool) - Browser tool is a virtual browser integration that lets AI agents interact with the web programmatically. It enables automated browsing, scraping, and action-taking from any AI workflow.
- [Ai ml api](https://composio.dev/toolkits/ai_ml_api) - Ai ml api is a suite of AI/ML models for natural language and image tasks. It provides fast, scalable access to advanced AI capabilities for your apps and workflows.
- [Aivoov](https://composio.dev/toolkits/aivoov) - Aivoov is an AI-powered text-to-speech platform offering 1,000+ voices in over 150 languages. Instantly turn written content into natural, human-like audio for any application.
- [All images ai](https://composio.dev/toolkits/all_images_ai) - All-Images.ai is an AI-powered image generation and management platform. It helps you create, search, and organize images effortlessly with advanced AI capabilities.
- [AltTextLab](https://composio.dev/toolkits/alt_text_lab) - AltTextLab is an AI service that generates accessible, SEO-aware alt text for images. It helps teams make image content easier to understand, index, and publish.
- [Anthropic administrator](https://composio.dev/toolkits/anthropic_administrator) - Anthropic administrator is an API for managing Anthropic organizational resources like members, workspaces, and API keys. It helps you automate admin tasks and streamline resource management across your Anthropic organization.
- [Api labz](https://composio.dev/toolkits/api_labz) - Api labz is a platform offering a suite of AI-driven APIs and workflow tools. It helps developers automate tasks and build smarter, more efficient applications.
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- [Apipie ai](https://composio.dev/toolkits/apipie_ai) - Apipie ai is an AI model aggregator offering a single API for accessing top AI models from multiple providers. It helps developers build cost-efficient, latency-optimized AI solutions without juggling multiple integrations.
- [Arize AX](https://composio.dev/toolkits/arize_ax) - Arize AX is an AI engineering platform for tracing, evaluating, and improving AI applications. Use it to debug LLM behavior, compare experiments, and improve production AI quality.
- [Artificial Analysis](https://composio.dev/toolkits/artificial_analysis) - Artificial Analysis is an independent benchmarking platform for AI models and API providers. Use it to compare model intelligence, coding, math, pricing, latency, throughput, and arena rankings.
- [AssemblyAI](https://composio.dev/toolkits/assemblyai) - AssemblyAI is a speech-to-text and audio intelligence API for uploaded or hosted media. Use it to turn audio and video into accurate transcripts, summaries, and insights.
- [Astica ai](https://composio.dev/toolkits/astica_ai) - Astica ai provides APIs for computer vision, NLP, and voice synthesis. Integrate advanced AI features into your app with a single API key.
- [Avoma](https://composio.dev/toolkits/avoma) - Avoma is an AI meeting assistant for recording, transcribing, analyzing, and managing meetings, calls, notes, scorecards, and conversation intelligence. It helps teams turn conversations into searchable notes, follow-ups, coaching insights, and revenue intelligence.
- [Bigml](https://composio.dev/toolkits/bigml) - BigML is a machine learning platform that lets you build, train, and deploy predictive models from your data. Its intuitive interface and robust API make machine learning accessible and efficient.
- [Black Forest Labs](https://composio.dev/toolkits/bfl) - Black Forest Labs provides hosted FLUX models for generating and editing images and videos. It offers fast, flexible media creation with asynchronous processing and fine-tuning support.
- [Bland AI](https://composio.dev/toolkits/bland_ai) - Bland AI is a conversational AI platform for building voice agents, phone calls, messaging, and communication workflows. Use it to automate calling, evaluate conversations, and run voice operations at scale.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Cartesia MCP?

With a standalone Cartesia MCP server, the agents and LLMs can only access a fixed set of Cartesia tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Cartesia and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with Claude Cowork?

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Cartesia tools.

### Can I manage the permissions and scopes for Cartesia while using Tool Router?

Yes, absolutely. You can configure which Cartesia scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

### How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Cartesia data and credentials are handled as safely as possible.

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