Deepl MCP server

@pipeworx/deepl

DeepL API MCP — high-quality machine translation. Free tier 500k chars/mo.

Part of Pipeworx — an MCP gateway connecting AI agents to 1679+ live data sources.

Auth

character quota: measured 2026-08-28, usage on the same key answers charactercount: 0 against a full characterlimit while translate 456s in the next call. Zero successes in the seven days before that. Waiting does not clear it — pass your own key as apiKey. The read-only tools (usage, sourcelanguages, targetlanguages, glossarylanguage_pairs) still answer on the shared key. Fleet #577.

• Platform: PLATFORMDEEPLKEY. BYO: ?_apiKey=….
• Free-tier keys end with :fx (auto-detected → free endpoint).
• translate is currently refused on the Pipeworx shared key (HTTP 456), and it is not a

Tools

• translate(text, targetlang, sourcelang?, splitsentences?, preserveformatting?, formality?, glossaryid?, taghandling?, outlinedetection?, nonsplittingtags?, splittingtags?, ignore_tags?) — translate text (one or many strings)
• usage() — current month's usage + limits
• source_languages() — supported source languages
• target_languages() — supported target languages
• glossarylanguagepairs() — supported glossary language pairs

text accepts a string or array of strings. targetlang: e.g. EN-US, DE, JA, ES, FR. formality: default | more | less | prefermore | prefer_less.

Data source

https://api.deepl.com/v2 (paid) | https://api-free.deepl.com/v2 (free, auto-selected when key ends with :fx)

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "deepl": {
      "url": "https://gateway.pipeworx.io/deepl/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/deepl/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — askpipeworx, discovertools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1679+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

Our deepl key is reserved for signed-up accounts (free at https://pipeworx.io), so an anonymous call to POST https://gateway.pipeworx.io/v1/tools/deepltranslate needs your own key passed as apiKey alongside the arguments. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/deepltranslate. Find one: POST https://gateway.pipeworx.io/v1/tools/searchpacks with {"query":"..."}.

Standalone (no gateway account)

This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:

{
  "mcpServers": {
    "deepl": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-deepl"]
    }
  }
}

Or run it directly to confirm it starts:

Shortened. The full README is on GitHub.