> ## 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. # ServerToolSupportedAPIFormat ## Example Usage ```go theme={null} import ( "github.com/OpenRouterTeam/go-sdk/models/components" ) value := components.ServerToolSupportedAPIFormatResponses // Open enum: custom values can be created with a direct type cast custom := components.ServerToolSupportedAPIFormat("custom_value") ``` ## Values | Name | Value | | - | - | | `ServerToolSupportedAPIFormatResponses` | responses | | `ServerToolSupportedAPIFormatChatCompletions` | chat-completions | | `ServerToolSupportedAPIFormatAnthropicMessages` | anthropic-messages |