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How to connect DeepL MCP to Claude

Connect Claude Web, Desktop and Cowork to DeepL MCP. Translate product copy into french and spanish, improve this customer email for clearer english, and more using natural language, with authentication handled for you.

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DeepL MCP is a provider-hosted translation and writing assistant server powered by DeepL. It helps deliver accurate multilingual translations and clearer writing through a single MCP connection.

9 Tools

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 DeepL account to Claude via Composio Connect, enabling it to translate product copy into French and Spanish, improve this customer email for clearer English, list languages supported for document translation, 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 DeepL MCP with

ChatGPTHermesAtomic Agent

Connecting DeepL 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

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your DeepL account

Back in Claude, ask it to connect to DeepL or give it any DeepL-related task.

For example, ask Claude to:

  • "Translate product copy into French and Spanish"
  • "Improve this customer email for clearer English"
  • "List languages supported for document translation"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your DeepL account is ready to use.

What is the DeepL Claude Connector, and what's possible with it?

The DeepL MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your DeepL account. It provides structured and secure access to DeepL's translation and writing tools, so your agent can translate text, translate documents, correct writing, and rephrase content on your behalf.

  • Text translation: Have your agent translate text into one or more target languages using DeepL.
  • Document translation: Let the agent upload documents for translation while preserving their original layout and formatting, then check the translation status and download the finished document.
  • Writing correction: Direct your agent to fix typos, grammar, and punctuation errors in one or more texts.
  • Text rephrasing: Instruct your agent to rephrase content in the same language or a different language.
  • Language discovery: Have your agent find the source and target language codes supported by DeepL before starting a translation.

Troubleshooting

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

The connector can show as connected, but Claude must use it in each DeepL conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to DeepL again.

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

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for DeepL.

  • 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 DeepL.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the DeepL authorization link not work?

The Composio connector is one server. Your DeepL account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the DeepL connection.
  • Composio creates a fresh DeepL authorization link.
  • Open that link in your browser and finish the DeepL sign-in.

4. Why do DeepL actions fail after they worked before?

The DeepL connection can expire or lose permission.

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

5. How do I switch to a different DeepL account?

Claude can manage the DeepL connection for you.

  • Ask Claude to disconnect or delete the current DeepL account.
  • Ask Claude to connect DeepL again.
  • Open the new Composio authorization link for DeepL.
  • Sign in with the other DeepL account in the browser.
  • After the account connects, ask Claude to retry the DeepL task.

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

The connector belongs to your Claude account, so your DeepL connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If DeepL 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 DeepL.
TOOLS

Supported Tools

Every DeepL MCP action and event your agent gets out of the box.

Correct-text

Correct one or more texts for typos, grammar and punctuation errors using DeepL.

Download-document

Get a download link for a translated document once its status is 'done'.

Get-document-status

Check the translation status of a document session.

Get-source-languages

Get the source language codes supported by DeepL for translation, e.

Get-target-languages

Get the target language codes supported by DeepL for translation, e.

Rephrase-text

Rephrase text in the same or a different language using DeepL.

Translate-text

Translate text to one or more target languages using DeepL.

Upload-document

Translate a whole file or document, preserving its original layout and formatting.

Upload-document-show-fallback-widget

Second step of a document translation, for when the file bytes cannot be sent to 'uploadUrl': shows the user an upload widget for the upload session that upload-document already reserved, so they can select the file themselves.

FRAMEWORKS

How to build DeepL MCP Agent with another framework

ChatGPT logo

ChatGPT

Use DeepL MCP with ChatGPT

Hermes logo

Hermes

Use DeepL MCP with Hermes

Atomic Agent logo

Atomic Agent

Use DeepL MCP with Atomic Agent

FAQ

Frequently asked questions

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

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 DeepL tools.

Yes, absolutely. You can configure which DeepL 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.

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 DeepL data and credentials are handled as safely as possible.

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