> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-a46887cf.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# MessagesOutputConfig - Go SDK

> MessagesOutputConfig type definition

<Warning>
  The Go SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/go-sdk/issues).
</Warning>

Configuration for controlling output behavior. Supports the effort parameter and structured output format.

## Fields

| Field        | Type                                                                                                                                         | Required             | Description                                                                                                                                                                                     | Example                              |
| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------- | -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------ |
| `Effort`     | optionalnullable.OptionalNullable\[[components.MessagesOutputConfigEffort](/client-sdks/go/api-reference/models/messagesoutputconfigeffort)] | :heavy\_minus\_sign: | How much effort the model should put into its response. Higher effort levels may result in more thorough analysis but take longer. Valid values are `low`, `medium`, `high`, `xhigh`, or `max`. | medium                               |
| `Format`     | optionalnullable.OptionalNullable\[[components.MessagesOutputConfigFormat](/client-sdks/go/api-reference/models/messagesoutputconfigformat)] | :heavy\_minus\_sign: | A schema to specify Claude's output format in responses. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs).                                    |                                      |
| `TaskBudget` | optionalnullable.OptionalNullable\[[components.TaskBudget](/client-sdks/go/api-reference/models/taskbudget)]                                 | :heavy\_minus\_sign: | Task budget for an agentic turn. The model sees a countdown of remaining tokens and uses it to prioritize work and wind down gracefully. Advisory — does not enforce a hard cap.                | `{"total": 400000,"type": "tokens"}` |