How to integrate DeepL MCP with Atomic Agent

Connect Atomic Agent 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

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including DeepL.

This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a DeepL account. See the Atomic Agent documentation for installation instructions.

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How Atomic Agent connects to DeepL

Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.

Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

Connect DeepL to Atomic Agent

  1. Sign up or sign in to the Composio dashboard. Copy your API key.
  2. In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
  3. Ask Atomic Agent to do something in DeepL. It searches Composio for the right tool.
  4. On first use, open the sign-in link returned in the chat. Connect your DeepL account, then return to Atomic Agent to continue.

Headless setup

Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY

What is the DeepL MCP server, 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.

Use DeepL from Atomic Agent

With your account connected, ask Atomic Agent to work with DeepL in natural language. You can connect more apps through the same Composio integration as you need them.

Visit the Atomic Agent website or inspect the Atomic Agent source code.

Troubleshooting

Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See Composio pricing for the current limits that apply to your connection.

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.

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. Atomic Agent 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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