> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# MessagesOutputConfigFormat

A schema to specify Claude's output format in responses. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs).

## Example Usage

```typescript theme={null}
import { MessagesOutputConfigFormat } from "@openrouter/sdk/models";

let value: MessagesOutputConfigFormat = {
  schema: {},
  type: "json_schema",
};
```

## Fields

| Field    | Type                                                                                          | Required             | Description |
| -------- | --------------------------------------------------------------------------------------------- | -------------------- | ----------- |
| `schema` | Record\<string, *any*>                                                                        | :heavy\_check\_mark: | N/A         |
| `type`   | [models.MessagesOutputConfigTypeJSONSchema](../models/messagesoutputconfigtypejsonschema.mdx) | :heavy\_check\_mark: | N/A         |