# ubiquitous-language.txt

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***

**Added in** `eventcatalog@5.9.0`

Give AI tools one file with the ubiquitous language of your whole organization.

### What is ubiquitous-language.txt?[​](#what-is-ubiquitous-languagetxt "Direct link to What is ubiquitous-language.txt?")

The file lists the terms of every domain and subdomain, with subdomains under their parent domain. It is generated from your [`ubiquitous-language.mdx`](/docs/development/guides/domains/ownership-and-language/adding-ubiquitous-language.md) files, so there is nothing to configure.

Terms are never merged, because a word can mean different things in different domains. Terms defined in more than one domain are listed together at the top of the file, with the meaning in each domain.

```
## Terms defined in more than one domain
- Reservation
  - Fulfilment: A temporary hold on stock for a specific order, taken during checkout.
  - Ordering: A temporary hold on stock for the items in a cart, taken during checkout.
```

Each term is one line with its summary (or its description, flattened to one line, when it has no summary). Each domain section links to that domain's `/docs/domains/{id}/language.mdx` for the full definitions.

### Access the file[​](#access-the-file "Direct link to Access the file")

* `https://<your-catalog-url>/docs/llm/ubiquitous-language.txt`

The file is turned on and off with the `llmsTxt` setting, the same as [llms.txt](/docs/development/developer-tools/llms.txt.md). When it is disabled the file returns a 404. It is linked from the LLM access settings page, and from the Ubiquitous Language section of `llms.txt`.

### Use with the MCP server[​](#use-with-the-mcp-server "Direct link to Use with the MCP server")

The [EventCatalog MCP server](/docs/development/ask-your-architecture/mcp-server/getting-started.md#available-tools) exposes the same language through the `explainUbiquitousLanguageTerms` tool.