> ## 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.

# MessagesRequestToolUnion - Go SDK

> MessagesRequestToolUnion type definition

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

## Supported Types

### ToolCustom

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionToolCustom(components.ToolCustom{/* values here */})
```

### ToolBash20250124

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionToolBash20250124(components.ToolBash20250124{/* values here */})
```

### ToolTextEditor20250124

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionToolTextEditor20250124(components.ToolTextEditor20250124{/* values here */})
```

### ToolWebSearch20250305

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionToolWebSearch20250305(components.ToolWebSearch20250305{/* values here */})
```

### ToolWebSearch20260209

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionToolWebSearch20260209(components.ToolWebSearch20260209{/* values here */})
```

### ToolAdvisor20260301

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionToolAdvisor20260301(components.ToolAdvisor20260301{/* values here */})
```

### DatetimeServerTool

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionDatetimeServerTool(components.DatetimeServerTool{/* values here */})
```

### ImageGenerationServerToolOpenRouter

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionImageGenerationServerToolOpenRouter(components.ImageGenerationServerToolOpenRouter{/* values here */})
```

### ChatSearchModelsServerTool

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionChatSearchModelsServerTool(components.ChatSearchModelsServerTool{/* values here */})
```

### WebFetchServerTool

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionWebFetchServerTool(components.WebFetchServerTool{/* values here */})
```

### OpenRouterWebSearchServerTool

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionOpenRouterWebSearchServerTool(components.OpenRouterWebSearchServerTool{/* values here */})
```

### MessagesRequestTool

```go lines theme={null}
messagesRequestToolUnion := components.CreateMessagesRequestToolUnionMessagesRequestTool(components.MessagesRequestTool{/* values here */})
```

## Union Discrimination

Use the `Type` field to determine which variant is active, then access the corresponding field:

```go expandable lines theme={null}
switch messagesRequestToolUnion.Type {
	case components.MessagesRequestToolUnionTypeToolCustom:
		// messagesRequestToolUnion.ToolCustom is populated
	case components.MessagesRequestToolUnionTypeToolBash20250124:
		// messagesRequestToolUnion.ToolBash20250124 is populated
	case components.MessagesRequestToolUnionTypeToolTextEditor20250124:
		// messagesRequestToolUnion.ToolTextEditor20250124 is populated
	case components.MessagesRequestToolUnionTypeToolWebSearch20250305:
		// messagesRequestToolUnion.ToolWebSearch20250305 is populated
	case components.MessagesRequestToolUnionTypeToolWebSearch20260209:
		// messagesRequestToolUnion.ToolWebSearch20260209 is populated
	case components.MessagesRequestToolUnionTypeToolAdvisor20260301:
		// messagesRequestToolUnion.ToolAdvisor20260301 is populated
	case components.MessagesRequestToolUnionTypeDatetimeServerTool:
		// messagesRequestToolUnion.DatetimeServerTool is populated
	case components.MessagesRequestToolUnionTypeImageGenerationServerToolOpenRouter:
		// messagesRequestToolUnion.ImageGenerationServerToolOpenRouter is populated
	case components.MessagesRequestToolUnionTypeChatSearchModelsServerTool:
		// messagesRequestToolUnion.ChatSearchModelsServerTool is populated
	case components.MessagesRequestToolUnionTypeWebFetchServerTool:
		// messagesRequestToolUnion.WebFetchServerTool is populated
	case components.MessagesRequestToolUnionTypeOpenRouterWebSearchServerTool:
		// messagesRequestToolUnion.OpenRouterWebSearchServerTool is populated
	case components.MessagesRequestToolUnionTypeMessagesRequestTool:
		// messagesRequestToolUnion.MessagesRequestTool is populated
}
```