KorrektWort MCP

npx add-mcp 'https://korrektwort.com/api/mcp'

Found a German word while using AI? Keep it.

You are reading an article with Claude, or photographing a page of your textbook, and a word comes up that you want. Connect KorrektWort once and you can say “save these to my KorrektWort”. The words land in your vocabulary with their article, meaning, grammar and examples, scheduled for review.

Your AI conversation ends. Your learning does not.

How it works

1. 1 In your AI assistant Read, translate, ask about a text. Pick the words worth keeping.
2. 2 Say “save these” The assistant sends just the words. KorrektWort looks each one up itself.
3. 3 They come back In stories, grammar practice, writing and review until you know them.

The assistant picks the words. KorrektWort defines them.

An AI assistant is good at noticing which words in a text are worth learning. It is not our dictionary. Only the words themselves are sent: KorrektWort then resolves each one through its own pipeline, so gefühlt is saved as fühlen. It supplies the article, plural, CEFR level, grammar and examples from its own shared dictionary, exactly as if you had typed the word in yourself. Nothing the assistant says about a word is stored.

Connect Claude

1. 1In Claude, open Settings → Connectors and choose Add custom connector.
2. 2Name it KorrektWort and paste the server URL below.
3. 3Claude will ask you to sign in. Use the KorrektWort account you already have.
4. 4A consent screen appears naming one permission: add German words to your account. Approve it.
5. 5Ask Claude to save words whenever you like. For example, “pick the eight most useful B2 words from this page and save them to my KorrektWort”.

Server URL

https://korrektwort.com/api/mcp

What the assistant can reach

It can

Add German words to your account

And nothing else. That is the whole permission.

It cannot

• Read your words, notes or review history
• Delete or change anything you have
• See your email, password or payment details
• Use your credits or buy anything
• Write to anyone else's account

Which account a word belongs to is decided by the sign-in you completed, never by anything the assistant sends. There is no field in the request that can name a different learner.

Your conversation is never sent to KorrektWort. Only the German words are sent. Disconnect at any time from your assistant’s connector settings; access stops immediately.

Which assistants work

KorrektWort implements the open Model Context Protocol, so it is not tied to one company. What follows is what we have actually tested, kept separate from what each platform says it allows.

Assistant	Status
Claude	Verified by us Custom connector, on every Claude plan.
ChatGPT	Not tested by us OpenAI lists write-capable custom MCP apps as a beta for Business, Enterprise and Edu workspaces, which an admin must enable. On Pro, developer mode is described as read-only, which would not permit saving.
Gemini	Not tested by us Google’s custom apps are English-only, need a personal account, and are not currently offered across much of Europe, including Germany.

Availability depends on the AI platform, your plan and your region, and all three change often. Platform details above last checked 11 October 2026. If you connect KorrektWort successfully from another assistant, we would like to hear about it.

For developers

Endpoint

https://korrektwort.com/api/mcp

Protocol

Model Context Protocol, revision 2026-07-28, over Streamable HTTP. Stateless, so it runs as ordinary serverless functions with no session store.

Authorization

OAuth 2.1 with PKCE (S256 only) and Dynamic Client Registration. Discovery via RFC 9728 protected-resource metadata and RFC 8414 server metadata.

Scope

words:write is the only scope. The only tool is add_words.

Neutrality

One standards-compliant server with no vendor-specific behaviour, so any compliant client can connect.

You need a free KorrektWort account

That is where the words go. Making one takes a few seconds and needs no password.

Create a free account

New to KorrektWort? See what it does · Read the blog

Last updated 11 October 2026