* `title`: The OpenAPI title, shown in the docs.
* `version`: The version of your API, e.g. `2.5.0`.
* `openapi_version`: The version of the OpenAPI specification used. By default, the latest: `3.1.0`.
* `summary`: A short summary of the API.
* `description`: The description of your API, this can include markdown and will be shown in the docs.

```Python hl_lines="3-16  18"
{!../../docs_src/metadata/tutorial004.py!}
```

Notice that you can use Markdown inside of the descriptions, for example "login" will be shown in bold (**login**) and "fancy" will be shown in italics (_fancy_).

/// tip

You don't have to add metadata for all the tags that you use.

///

### Use your tags

    return this;
  }

  private long elapsedNanos() {
    return isRunning ? ticker.read() - startTick + elapsedNanos : elapsedNanos;
  }

  /**
   * Returns the current elapsed time shown on this stopwatch, expressed in the desired time unit,
   * with any fraction rounded down.
   *
   * <p><b>Note:</b> the overhead of measurement can be more than a microsecond, so it is generally

g|array)",boundary:"(string|element)",customClass:"(string|function)",sanitize:"boolean",sanitizeFn:"(null|function)",whiteList:"object",popperConfig:"(null|object)"},Mt={HIDE:"hide.bs.tooltip",HIDDEN:"hidden.bs.tooltip",SHOW:"show.bs.tooltip",SHOWN:"shown.bs.tooltip",INSERTED:"inserted.bs.tooltip",CLICK:"click.bs.tooltip",FOCUSIN:"focusin.bs.tooltip",FOCUSOUT:"focusout.bs.tooltip",MOUSEENTER:"mouseenter.bs.tooltip",MOUSELEAVE:"mouseleave.bs.tooltip"},Wt=function(){function t(t,e){if("undefined"==typeof...

        ] = Default(JSONResponse),
        responses: Annotated[
            Optional[Dict[Union[int, str], Dict[str, Any]]],
            Doc(
                """
                Additional responses to be shown in OpenAPI.

                It will be added to the generated OpenAPI (e.g. visible at `/docs`).

                Read more about it in the

{* ../../docs_src/additional_responses/tutorial003.py hl[20:31] *}

It will all be combined and included in your OpenAPI, and shown in the API docs:

<img src="/img/tutorial/additional-responses/image01.png">

## Combine predefined responses and custom ones

<img src="/img/tutorial/generate-clients/image01.png">

You can see those schemas because they were declared with the models in the app.

That information is available in the app's **OpenAPI schema**, and then shown in the API docs (by Swagger UI).

And that same information from the models that is included in OpenAPI is what can be used to **generate the client code**.

### Generate a TypeScript Client

## Automatic docs

The JSON Schemas of your models will be part of your OpenAPI generated schema, and will be shown in the interactive API docs:

<img src="/img/tutorial/body/image01.png">

And will also be used in the API docs inside each *path operation* that needs them:

<img src="/img/tutorial/body/image02.png">

All these dependencies, while declaring their requirements, also add parameters, validations, etc. to your *path operations*.

'(string|function)',\n  sanitize: 'boolean',\n  sanitizeFn: '(null|function)',\n  whiteList: 'object',\n  popperConfig: '(null|object)'\n}\n\nconst Event = {\n  HIDE: `hide${EVENT_KEY}`,\n  HIDDEN: `hidden${EVENT_KEY}`,\n  SHOW: `show${EVENT_KEY}`,\n  SHOWN: `shown${EVENT_KEY}`,\n  INSERTED: `inserted${EVENT_KEY}`,\n  CLICK: `click${EVENT_KEY}`,\n  FOCUSIN: `focusin${EVENT_KEY}`,\n  FOCUSOUT: `focusout${EVENT_KEY}`,\n  MOUSEENTER: `mouseenter${EVENT_KEY}`,\n  MOUSELEAVE: `mouseleave${EVENT_KEY}`\n}\n\n/**\n...