Our knowledge for AI services

All articles also come in a form that programs can read well. It costs nothing and needs neither an account nor a key.

What there is

llms.txt: Overview of the app and all articles
llms-full.txt: All articles in full
/en/wissen/kreatin.md: Every article as Markdown: add .md to the address
/api/knowledge: JSON API with articles, sources and search
OpenAPI: Description of the API

Connect the MCP server

The address is:

https://kostenlos-abnehmen.de/api/mcp

Claude: In the settings under connectors, add a custom connector with this address.
ChatGPT: In developer mode, add a custom connector with this address, without sign-in.
Other programs: Add the address as a remote server with Streamable HTTP.

The menus at these providers change often, the address stays the same.

What the server can do

search: finds articles for a question
fetch: returns a whole article with its sources
list_articles: lists all articles in one language

What applies

Reading only: There are only the public articles and their sources. None of this is connected to accounts or entries.
Every answer includes the link to the article. If you use the content, please name kostenlos-abnehmen.de and link the article.
The articles are general information and not medical advice.
Our app does not store search queries. With the API they are part of the address and can show up in access logs, MCP sends them in the body of the request. Sending very many requests stops the answers for a while.

Connect ChatGPT, Claude and others

Assistants log meals, water, weight and more in your diary and read what you allow. You set what they may do per area and change it any time under Settings, “Account and sync”.

The address for every assistant:

https://kostenlos-abnehmen.de/api/v1/mcp

Claude

Under “Customize” and “Connectors”, choose “Add custom connector” and enter the address.
Claude sends you to us. Sign in, look at the rights, untick what you do not want and tap “Allow”.
Afterwards it works in Claude Desktop and the phone app as well.

In Claude Code one command is enough, then “/mcp” and sign in:

claude mcp add --transport http kostenlos-abnehmen https://kostenlos-abnehmen.de/api/v1/mcp

ChatGPT

According to OpenAI, your own servers connect only in ChatGPT Business, Enterprise and Edu, as admin or owner. Free and Plus cannot.
Under “Plugins”, choose “+” and “Add custom MCP server”, enter the address, pick OAuth and sign in with us.

OpenAI ends custom GPTs with actions on 11 December 2026, so there is no guide for them any more.

Le Chat and Perplexity

Le Chat: under “Connectors”, add a custom MCP connector with the address and a key from your account as bearer token.
Perplexity: add a custom connector with the address and pick OAuth. A key works too.

For your own programs there is a description of the REST API: https://kostenlos-abnehmen.de/api/v1/openapi.json

Example message

Here is a photo of my lunch. Estimate calories, protein, fat, carbs and fiber and log it as lunch in kostenlos-abnehmen.

The values come from the assistant and are estimates. The app shows them with the name of the assistant.

What you give the assistant, and with reading rights also the data of the allowed areas, its provider processes under its own rules. We send it nothing on our own.