Create Message - Beta Messages API (Go)

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Published: 2026-05-10 · Source: crawler_authoritative

Tình huống

Go SDK reference for creating structured messages via the Anthropic Messages API, supporting single queries and stateless multi-turn conversations.

Insight

The Beta Messages API endpoint client.Beta.Messages.New(ctx, params) calls POST /v1/messages to generate model responses. It accepts MaxTokens (max token generation limit, set to 0 to pre-warm prompt cache without generating a response), Messages (array of role/content blocks with support for text, images, documents, search results, thinking blocks, tool use/results, and more — up to 100,000 messages per request), Model selection, CacheControl for automatic cache markers, Container for container reuse with skills, ContextManagement for controlling context behavior, InferenceGeo for geographic routing, MCP server configurations, Metadata, OutputConfig/OutputFormat for structured outputs, ServiceTier for priority vs standard capacity, Speed mode (standard/fast), StopSequences for custom stopping triggers, System prompts, Temperature (0.0–1.0), Thinking config (requires min 1,024 token budget), ToolChoice, Tools definitions (client tools with name/description/JSON schema input_schema, or server tools like Bash, CodeExecution with REPL state persistence, Computer for UI automation, TextEditor/StrReplaceBasedEditTool, WebSearch with domain filtering and user location, WebFetch with citations and caching, Advisor tool, ToolSearch with BM25/regex scoring, MCP toolsets), and TopK/TopP sampling parameters. Beta headers enable features like prompt caching (prompt-caching-2024-07-31), extended cache TTL, computer use, PDFs, token counting, files API, MCP client, thinking modes, code execution, context management, 1M context, skills, fast mode, output 300k, user profiles, advisor tool, and managed agents.

Hành động

Construct params with BetaMessageNewParams containing required MaxTokens and Messages (array of BetaMessageParam with role=user or role=assistant and content as either string or array of BetaContentBlockParamUnion including text blocks, image blocks with base64/URL/file sources supporting image/jpeg/png/gif/webp, document blocks with PDF/text/content/file sources, search result blocks, thinking blocks, tool_use/tool_result blocks, server tool blocks, MCP blocks, container upload blocks, and compaction blocks). Optionally set Model (default varies), System prompt via top-level system parameter (not in messages), Tools with name/description/input_schema, Temperature (default 1.0), stop_sequences, or enable beta features via Betas header array. Call client.Beta.Messages.New(ctx, params) and handle the returned BetaMessage with Content array (text/tool_use/server_tool_use/etc.), stop_reason (end_turn/max_tokens/stop_sequence/tool_use/pause_turn/compaction/refusal/model_context_window_exceeded), Usage breakdown (input/output/cache tokens, per-iteration usage, server tool counts), and model/role/type fields.

Kết quả

Returns BetaMessage containing id, container info with skills, content array with model-generated blocks (text/thinking/tool_use/web_search_result/etc.), model, role=assistant, stop_reason, stop_sequence, usage with cache_creation_input_tokens/cache_read_input_tokens/inference_geo, iterations breakdown, server_tool_use counts, service_tier, and speed. Content blocks include citations for PDFs (page_location), plain text (char_location), and documents (content_block_location).

Điều kiện áp dụng

Go SDK beta endpoint for Messages API; supports extended thinking, code execution, MCP tools, prompt caching, and container-based execution.

Nội dung gốc (Original)

Create

client.Beta.Messages.New(ctx, params) (*BetaMessage, error)

post /v1/messages

Send a structured list of input messages with text and/or image content, and the model will generate the next message in the conversation.

The Messages API can be used for either single queries or stateless multi-turn conversations.

Learn more about the Messages API in our user guide

Parameters

params BetaMessageNewParams
- MaxTokens param.Field[int64]
  
  Body param: The maximum number of tokens to generate before stopping.
  
  Note that our models may stop before reaching this maximum. This parameter only specifies the absolute maximum number of tokens to generate.
  
  Set to 0 to populate the prompt cache without generating a response.
  
  Different models have different maximum values for this parameter. See models for details.
- Messages param.Field[[]BetaMessageParamResp]
  
  Body param: Input messages.
  
  Our models are trained to operate on alternating user and assistant conversational turns. When creating a new Message, you specify the prior conversational turns with the messages parameter, and the model then generates the next Message in the conversation. Consecutive user or assistant turns in your request will be combined into a single turn.
  
  Each input message must be an object with a role and content. You can specify a single user-role message, or you can include multiple user and assistant messages.
  
  If the final message uses the assistant role, the response content will continue immediately from the content in that message. This can be used to constrain part of the model’s response.
  
  Example with a single user message:
```
[{"role": "user", "content": "Hello, Claude"}]
```
  Example with multiple conversational turns:
```
[
  {"role": "user", "content": "Hello there."},
  {"role": "assistant", "content": "Hi, I'm Claude. How can I help you?"},
  {"role": "user", "content": "Can you explain LLMs in plain English?"},
]
```
  Example with a partially-filled response from Claude:
```
[
  {"role": "user", "content": "What's the Greek name for Sun? (A) Sol (B) Helios (C) Sun"},
  {"role": "assistant", "content": "The best answer is ("},
]
```
  Each input message content may be either a single string or an array of content blocks, where each block has a specific type. Using a string for content is shorthand for an array of one content block of type "text". The following input messages are equivalent:
```
{"role": "user", "content": "Hello, Claude"}
```
```
{"role": "user", "content": [{"type": "text", "text": "Hello, Claude"}]}
```
  See input examples.
  
  Note that if you want to include a system prompt, you can use the top-level system parameter — there is no "system" role for input messages in the Messages API.
  
  There is a limit of 100,000 messages in a single request.
  - Content []BetaContentBlockParamUnionResp
    - []BetaContentBlockParamUnionResp
      - type BetaTextBlockParamResp struct{…}
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
      - type BetaImageBlockParamResp struct{…}
        
        Source BetaImageBlockParamSourceUnionResp
        
        type BetaBase64ImageSource struct{…}
        
        Data string
        
        MediaType BetaBase64ImageSourceMediaType
        
        const BetaBase64ImageSourceMediaTypeImageJPEG BetaBase64ImageSourceMediaType = "image/jpeg"
        
        const BetaBase64ImageSourceMediaTypeImagePNG BetaBase64ImageSourceMediaType = "image/png"
        
        const BetaBase64ImageSourceMediaTypeImageGIF BetaBase64ImageSourceMediaType = "image/gif"
        
        const BetaBase64ImageSourceMediaTypeImageWebP BetaBase64ImageSourceMediaType = "image/webp"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaURLImageSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileImageSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Image
        
        const ImageImage Image = "image"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaRequestDocumentBlock struct{…}
        
        Source BetaRequestDocumentBlockSourceUnion
        
        type BetaBase64PDFSource struct{…}
        
        Data string
        
        MediaType ApplicationPDF
        
        const ApplicationPDFApplicationPDF ApplicationPDF = "application/pdf"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaPlainTextSource struct{…}
        
        Data string
        
        MediaType TextPlain
        
        const TextPlainTextPlain TextPlain = "text/plain"
        
        Type Text
        
        const TextText Text = "text"
        
        type BetaContentBlockSource struct{…}
        
        Content BetaContentBlockSourceContentUnion
        
        string
        
        []BetaContentBlockSourceContentUnion
        
        type BetaTextBlockParamResp struct{…}
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        type BetaImageBlockParamResp struct{…}
        
        Source BetaImageBlockParamSourceUnionResp
        
        type BetaBase64ImageSource struct{…}
        
        Data string
        
        MediaType BetaBase64ImageSourceMediaType
        
        const BetaBase64ImageSourceMediaTypeImageJPEG BetaBase64ImageSourceMediaType = "image/jpeg"
        
        const BetaBase64ImageSourceMediaTypeImagePNG BetaBase64ImageSourceMediaType = "image/png"
        
        const BetaBase64ImageSourceMediaTypeImageGIF BetaBase64ImageSourceMediaType = "image/gif"
        
        const BetaBase64ImageSourceMediaTypeImageWebP BetaBase64ImageSourceMediaType = "image/webp"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaURLImageSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileImageSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Image
        
        const ImageImage Image = "image"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Type Content
        
        const ContentContent Content = "content"
        
        type BetaURLPDFSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileDocumentSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Document
        
        const DocumentDocument Document = "document"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations BetaCitationsConfigParamResp
        
        Enabled bool
        
        Context string
        
        Title string
      - type BetaSearchResultBlockParamResp struct{…}
        
        Content []BetaTextBlockParamResp
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        Source string
        
        Title string
        
        Type SearchResult
        
        const SearchResultSearchResult SearchResult = "search_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations BetaCitationsConfigParamResp
        
        Enabled bool
      - type BetaThinkingBlockParamResp struct{…}
        
        Signature string
        
        Thinking string
        
        Type Thinking
        
        const ThinkingThinking Thinking = "thinking"
      - type BetaRedactedThinkingBlockParamResp struct{…}
        
        Data string
        
        Type RedactedThinking
        
        const RedactedThinkingRedactedThinking RedactedThinking = "redacted_thinking"
      - type BetaToolUseBlockParamResp struct{…}
        
        ID string
        
        Input map[string, any]
        
        Name string
        
        Type ToolUse
        
        const ToolUseToolUse ToolUse = "tool_use"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Caller BetaToolUseBlockParamCallerUnionResp
        
        Tool invocation directly from the model.
        
        type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
        
        type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
        
        type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
      - type BetaToolResultBlockParamResp struct{…}
        
        ToolUseID string
        
        Type ToolResult
        
        const ToolResultToolResult ToolResult = "tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Content []BetaToolResultBlockParamContentUnionResp
        
        []BetaToolResultBlockParamContentUnionResp
        
        type BetaTextBlockParamResp struct{…}
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        type BetaImageBlockParamResp struct{…}
        
        Source BetaImageBlockParamSourceUnionResp
        
        type BetaBase64ImageSource struct{…}
        
        Data string
        
        MediaType BetaBase64ImageSourceMediaType
        
        const BetaBase64ImageSourceMediaTypeImageJPEG BetaBase64ImageSourceMediaType = "image/jpeg"
        
        const BetaBase64ImageSourceMediaTypeImagePNG BetaBase64ImageSourceMediaType = "image/png"
        
        const BetaBase64ImageSourceMediaTypeImageGIF BetaBase64ImageSourceMediaType = "image/gif"
        
        const BetaBase64ImageSourceMediaTypeImageWebP BetaBase64ImageSourceMediaType = "image/webp"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaURLImageSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileImageSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Image
        
        const ImageImage Image = "image"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        type BetaSearchResultBlockParamResp struct{…}
        
        Content []BetaTextBlockParamResp
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        Source string
        
        Title string
        
        Type SearchResult
        
        const SearchResultSearchResult SearchResult = "search_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations BetaCitationsConfigParamResp
        
        Enabled bool
        
        type BetaRequestDocumentBlock struct{…}
        
        Source BetaRequestDocumentBlockSourceUnion
        
        type BetaBase64PDFSource struct{…}
        
        Data string
        
        MediaType ApplicationPDF
        
        const ApplicationPDFApplicationPDF ApplicationPDF = "application/pdf"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaPlainTextSource struct{…}
        
        Data string
        
        MediaType TextPlain
        
        const TextPlainTextPlain TextPlain = "text/plain"
        
        Type Text
        
        const TextText Text = "text"
        
        type BetaContentBlockSource struct{…}
        
        Content BetaContentBlockSourceContentUnion
        
        string
        
        []BetaContentBlockSourceContentUnion
        
        type BetaTextBlockParamResp struct{…}
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        type BetaImageBlockParamResp struct{…}
        
        Source BetaImageBlockParamSourceUnionResp
        
        type BetaBase64ImageSource struct{…}
        
        Data string
        
        MediaType BetaBase64ImageSourceMediaType
        
        const BetaBase64ImageSourceMediaTypeImageJPEG BetaBase64ImageSourceMediaType = "image/jpeg"
        
        const BetaBase64ImageSourceMediaTypeImagePNG BetaBase64ImageSourceMediaType = "image/png"
        
        const BetaBase64ImageSourceMediaTypeImageGIF BetaBase64ImageSourceMediaType = "image/gif"
        
        const BetaBase64ImageSourceMediaTypeImageWebP BetaBase64ImageSourceMediaType = "image/webp"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaURLImageSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileImageSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Image
        
        const ImageImage Image = "image"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Type Content
        
        const ContentContent Content = "content"
        
        type BetaURLPDFSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileDocumentSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Document
        
        const DocumentDocument Document = "document"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations BetaCitationsConfigParamResp
        
        Enabled bool
        
        Context string
        
        Title string
        
        type BetaToolReferenceBlockParamResp struct{…}
        
        Tool reference block that can be included in tool_result content.
        
        ToolName string
        
        Type ToolReference
        
        const ToolReferenceToolReference ToolReference = "tool_reference"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        IsError bool
      - type BetaServerToolUseBlockParamResp struct{…}
        
        ID string
        
        Input map[string, any]
        
        Name BetaServerToolUseBlockParamName
        
        const BetaServerToolUseBlockParamNameAdvisor BetaServerToolUseBlockParamName = "advisor"
        
        const BetaServerToolUseBlockParamNameWebSearch BetaServerToolUseBlockParamName = "web_search"
        
        const BetaServerToolUseBlockParamNameWebFetch BetaServerToolUseBlockParamName = "web_fetch"
        
        const BetaServerToolUseBlockParamNameCodeExecution BetaServerToolUseBlockParamName = "code_execution"
        
        const BetaServerToolUseBlockParamNameBashCodeExecution BetaServerToolUseBlockParamName = "bash_code_execution"
        
        const BetaServerToolUseBlockParamNameTextEditorCodeExecution BetaServerToolUseBlockParamName = "text_editor_code_execution"
        
        const BetaServerToolUseBlockParamNameToolSearchToolRegex BetaServerToolUseBlockParamName = "tool_search_tool_regex"
        
        const BetaServerToolUseBlockParamNameToolSearchToolBm25 BetaServerToolUseBlockParamName = "tool_search_tool_bm25"
        
        Type ServerToolUse
        
        const ServerToolUseServerToolUse ServerToolUse = "server_tool_use"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Caller BetaServerToolUseBlockParamCallerUnionResp
        
        Tool invocation directly from the model.
        
        type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
        
        type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
        
        type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
      - type BetaWebSearchToolResultBlockParamResp struct{…}
        
        Content BetaWebSearchToolResultBlockParamContentUnionResp
        
        []BetaWebSearchResultBlockParamResp
        
        EncryptedContent string
        
        Title string
        
        Type WebSearchResult
        
        const WebSearchResultWebSearchResult WebSearchResult = "web_search_result"
        
        URL string
        
        PageAge string
        
        type BetaWebSearchToolRequestError struct{…}
        
        ErrorCode BetaWebSearchToolResultErrorCode
        
        const BetaWebSearchToolResultErrorCodeInvalidToolInput BetaWebSearchToolResultErrorCode = "invalid_tool_input"
        
        const BetaWebSearchToolResultErrorCodeUnavailable BetaWebSearchToolResultErrorCode = "unavailable"
        
        const BetaWebSearchToolResultErrorCodeMaxUsesExceeded BetaWebSearchToolResultErrorCode = "max_uses_exceeded"
        
        const BetaWebSearchToolResultErrorCodeTooManyRequests BetaWebSearchToolResultErrorCode = "too_many_requests"
        
        const BetaWebSearchToolResultErrorCodeQueryTooLong BetaWebSearchToolResultErrorCode = "query_too_long"
        
        const BetaWebSearchToolResultErrorCodeRequestTooLarge BetaWebSearchToolResultErrorCode = "request_too_large"
        
        Type WebSearchToolResultError
        
        const WebSearchToolResultErrorWebSearchToolResultError WebSearchToolResultError = "web_search_tool_result_error"
        
        ToolUseID string
        
        Type WebSearchToolResult
        
        const WebSearchToolResultWebSearchToolResult WebSearchToolResult = "web_search_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Caller BetaWebSearchToolResultBlockParamCallerUnionResp
        
        Tool invocation directly from the model.
        
        type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
        
        type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
        
        type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
      - type BetaWebFetchToolResultBlockParamResp struct{…}
        
        Content BetaWebFetchToolResultBlockParamContentUnionResp
        
        type BetaWebFetchToolResultErrorBlockParamResp struct{…}
        
        ErrorCode BetaWebFetchToolResultErrorCode
        
        const BetaWebFetchToolResultErrorCodeInvalidToolInput BetaWebFetchToolResultErrorCode = "invalid_tool_input"
        
        const BetaWebFetchToolResultErrorCodeURLTooLong BetaWebFetchToolResultErrorCode = "url_too_long"
        
        const BetaWebFetchToolResultErrorCodeURLNotAllowed BetaWebFetchToolResultErrorCode = "url_not_allowed"
        
        const BetaWebFetchToolResultErrorCodeURLNotAccessible BetaWebFetchToolResultErrorCode = "url_not_accessible"
        
        const BetaWebFetchToolResultErrorCodeUnsupportedContentType BetaWebFetchToolResultErrorCode = "unsupported_content_type"
        
        const BetaWebFetchToolResultErrorCodeTooManyRequests BetaWebFetchToolResultErrorCode = "too_many_requests"
        
        const BetaWebFetchToolResultErrorCodeMaxUsesExceeded BetaWebFetchToolResultErrorCode = "max_uses_exceeded"
        
        const BetaWebFetchToolResultErrorCodeUnavailable BetaWebFetchToolResultErrorCode = "unavailable"
        
        Type WebFetchToolResultError
        
        const WebFetchToolResultErrorWebFetchToolResultError WebFetchToolResultError = "web_fetch_tool_result_error"
        
        type BetaWebFetchBlockParamResp struct{…}
        
        Content BetaRequestDocumentBlock
        
        Source BetaRequestDocumentBlockSourceUnion
        
        type BetaBase64PDFSource struct{…}
        
        Data string
        
        MediaType ApplicationPDF
        
        const ApplicationPDFApplicationPDF ApplicationPDF = "application/pdf"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaPlainTextSource struct{…}
        
        Data string
        
        MediaType TextPlain
        
        const TextPlainTextPlain TextPlain = "text/plain"
        
        Type Text
        
        const TextText Text = "text"
        
        type BetaContentBlockSource struct{…}
        
        Content BetaContentBlockSourceContentUnion
        
        string
        
        []BetaContentBlockSourceContentUnion
        
        type BetaTextBlockParamResp struct{…}
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        type BetaImageBlockParamResp struct{…}
        
        Source BetaImageBlockParamSourceUnionResp
        
        type BetaBase64ImageSource struct{…}
        
        Data string
        
        MediaType BetaBase64ImageSourceMediaType
        
        const BetaBase64ImageSourceMediaTypeImageJPEG BetaBase64ImageSourceMediaType = "image/jpeg"
        
        const BetaBase64ImageSourceMediaTypeImagePNG BetaBase64ImageSourceMediaType = "image/png"
        
        const BetaBase64ImageSourceMediaTypeImageGIF BetaBase64ImageSourceMediaType = "image/gif"
        
        const BetaBase64ImageSourceMediaTypeImageWebP BetaBase64ImageSourceMediaType = "image/webp"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaURLImageSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileImageSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Image
        
        const ImageImage Image = "image"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Type Content
        
        const ContentContent Content = "content"
        
        type BetaURLPDFSource struct{…}
        
        Type URL
        
        const URLURL URL = "url"
        
        URL string
        
        type BetaFileDocumentSource struct{…}
        
        FileID string
        
        Type File
        
        const FileFile File = "file"
        
        Type Document
        
        const DocumentDocument Document = "document"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations BetaCitationsConfigParamResp
        
        Enabled bool
        
        Context string
        
        Title string
        
        Type WebFetchResult
        
        const WebFetchResultWebFetchResult WebFetchResult = "web_fetch_result"
        
        URL string
        
        Fetched content URL
        
        RetrievedAt string
        
        ISO 8601 timestamp when the content was retrieved
        
        ToolUseID string
        
        Type WebFetchToolResult
        
        const WebFetchToolResultWebFetchToolResult WebFetchToolResult = "web_fetch_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Caller BetaWebFetchToolResultBlockParamCallerUnionResp
        
        Tool invocation directly from the model.
        
        type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
        
        type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
        
        type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
      - type BetaAdvisorToolResultBlockParamResp struct{…}
        
        Content BetaAdvisorToolResultBlockParamContentUnionResp
        
        type BetaAdvisorToolResultErrorParamResp struct{…}
        
        ErrorCode BetaAdvisorToolResultErrorParamErrorCode
        
        const BetaAdvisorToolResultErrorParamErrorCodeMaxUsesExceeded BetaAdvisorToolResultErrorParamErrorCode = "max_uses_exceeded"
        
        const BetaAdvisorToolResultErrorParamErrorCodePromptTooLong BetaAdvisorToolResultErrorParamErrorCode = "prompt_too_long"
        
        const BetaAdvisorToolResultErrorParamErrorCodeTooManyRequests BetaAdvisorToolResultErrorParamErrorCode = "too_many_requests"
        
        const BetaAdvisorToolResultErrorParamErrorCodeOverloaded BetaAdvisorToolResultErrorParamErrorCode = "overloaded"
        
        const BetaAdvisorToolResultErrorParamErrorCodeUnavailable BetaAdvisorToolResultErrorParamErrorCode = "unavailable"
        
        const BetaAdvisorToolResultErrorParamErrorCodeExecutionTimeExceeded BetaAdvisorToolResultErrorParamErrorCode = "execution_time_exceeded"
        
        Type AdvisorToolResultError
        
        const AdvisorToolResultErrorAdvisorToolResultError AdvisorToolResultError = "advisor_tool_result_error"
        
        type BetaAdvisorResultBlockParamResp struct{…}
        
        Text string
        
        Type AdvisorResult
        
        const AdvisorResultAdvisorResult AdvisorResult = "advisor_result"
        
        type BetaAdvisorRedactedResultBlockParamResp struct{…}
        
        EncryptedContent string
        
        Opaque blob produced by a prior response; must be round-tripped verbatim.
        
        Type AdvisorRedactedResult
        
        const AdvisorRedactedResultAdvisorRedactedResult AdvisorRedactedResult = "advisor_redacted_result"
        
        ToolUseID string
        
        Type AdvisorToolResult
        
        const AdvisorToolResultAdvisorToolResult AdvisorToolResult = "advisor_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaCodeExecutionToolResultBlockParamResp struct{…}
        
        Content BetaCodeExecutionToolResultBlockParamContentUnionResp
        
        Code execution result with encrypted stdout for PFC + web_search results.
        
        type BetaCodeExecutionToolResultErrorParamResp struct{…}
        
        ErrorCode BetaCodeExecutionToolResultErrorCode
        
        const BetaCodeExecutionToolResultErrorCodeInvalidToolInput BetaCodeExecutionToolResultErrorCode = "invalid_tool_input"
        
        const BetaCodeExecutionToolResultErrorCodeUnavailable BetaCodeExecutionToolResultErrorCode = "unavailable"
        
        const BetaCodeExecutionToolResultErrorCodeTooManyRequests BetaCodeExecutionToolResultErrorCode = "too_many_requests"
        
        const BetaCodeExecutionToolResultErrorCodeExecutionTimeExceeded BetaCodeExecutionToolResultErrorCode = "execution_time_exceeded"
        
        Type CodeExecutionToolResultError
        
        const CodeExecutionToolResultErrorCodeExecutionToolResultError CodeExecutionToolResultError = "code_execution_tool_result_error"
        
        type BetaCodeExecutionResultBlockParamResp struct{…}
        
        Content []BetaCodeExecutionOutputBlockParamResp
        
        FileID string
        
        Type CodeExecutionOutput
        
        const CodeExecutionOutputCodeExecutionOutput CodeExecutionOutput = "code_execution_output"
        
        ReturnCode int64
        
        Stderr string
        
        Stdout string
        
        Type CodeExecutionResult
        
        const CodeExecutionResultCodeExecutionResult CodeExecutionResult = "code_execution_result"
        
        type BetaEncryptedCodeExecutionResultBlockParamResp struct{…}
        
        Code execution result with encrypted stdout for PFC + web_search results.
        
        Content []BetaCodeExecutionOutputBlockParamResp
        
        FileID string
        
        Type CodeExecutionOutput
        
        const CodeExecutionOutputCodeExecutionOutput CodeExecutionOutput = "code_execution_output"
        
        EncryptedStdout string
        
        ReturnCode int64
        
        Stderr string
        
        Type EncryptedCodeExecutionResult
        
        const EncryptedCodeExecutionResultEncryptedCodeExecutionResult EncryptedCodeExecutionResult = "encrypted_code_execution_result"
        
        ToolUseID string
        
        Type CodeExecutionToolResult
        
        const CodeExecutionToolResultCodeExecutionToolResult CodeExecutionToolResult = "code_execution_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaBashCodeExecutionToolResultBlockParamResp struct{…}
        
        Content BetaBashCodeExecutionToolResultBlockParamContentUnionResp
        
        type BetaBashCodeExecutionToolResultErrorParamResp struct{…}
        
        ErrorCode BetaBashCodeExecutionToolResultErrorParamErrorCode
        
        const BetaBashCodeExecutionToolResultErrorParamErrorCodeInvalidToolInput BetaBashCodeExecutionToolResultErrorParamErrorCode = "invalid_tool_input"
        
        const BetaBashCodeExecutionToolResultErrorParamErrorCodeUnavailable BetaBashCodeExecutionToolResultErrorParamErrorCode = "unavailable"
        
        const BetaBashCodeExecutionToolResultErrorParamErrorCodeTooManyRequests BetaBashCodeExecutionToolResultErrorParamErrorCode = "too_many_requests"
        
        const BetaBashCodeExecutionToolResultErrorParamErrorCodeExecutionTimeExceeded BetaBashCodeExecutionToolResultErrorParamErrorCode = "execution_time_exceeded"
        
        const BetaBashCodeExecutionToolResultErrorParamErrorCodeOutputFileTooLarge BetaBashCodeExecutionToolResultErrorParamErrorCode = "output_file_too_large"
        
        Type BashCodeExecutionToolResultError
        
        const BashCodeExecutionToolResultErrorBashCodeExecutionToolResultError BashCodeExecutionToolResultError = "bash_code_execution_tool_result_error"
        
        type BetaBashCodeExecutionResultBlockParamResp struct{…}
        
        Content []BetaBashCodeExecutionOutputBlockParamResp
        
        FileID string
        
        Type BashCodeExecutionOutput
        
        const BashCodeExecutionOutputBashCodeExecutionOutput BashCodeExecutionOutput = "bash_code_execution_output"
        
        ReturnCode int64
        
        Stderr string
        
        Stdout string
        
        Type BashCodeExecutionResult
        
        const BashCodeExecutionResultBashCodeExecutionResult BashCodeExecutionResult = "bash_code_execution_result"
        
        ToolUseID string
        
        Type BashCodeExecutionToolResult
        
        const BashCodeExecutionToolResultBashCodeExecutionToolResult BashCodeExecutionToolResult = "bash_code_execution_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaTextEditorCodeExecutionToolResultBlockParamResp struct{…}
        
        Content BetaTextEditorCodeExecutionToolResultBlockParamContentUnionResp
        
        type BetaTextEditorCodeExecutionToolResultErrorParamResp struct{…}
        
        ErrorCode BetaTextEditorCodeExecutionToolResultErrorParamErrorCode
        
        const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeInvalidToolInput BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "invalid_tool_input"
        
        const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeUnavailable BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "unavailable"
        
        const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeTooManyRequests BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "too_many_requests"
        
        const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeExecutionTimeExceeded BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "execution_time_exceeded"
        
        const BetaTextEditorCodeExecutionToolResultErrorParamErrorCodeFileNotFound BetaTextEditorCodeExecutionToolResultErrorParamErrorCode = "file_not_found"
        
        Type TextEditorCodeExecutionToolResultError
        
        const TextEditorCodeExecutionToolResultErrorTextEditorCodeExecutionToolResultError TextEditorCodeExecutionToolResultError = "text_editor_code_execution_tool_result_error"
        
        ErrorMessage string
        
        type BetaTextEditorCodeExecutionViewResultBlockParamResp struct{…}
        
        Content string
        
        FileType BetaTextEditorCodeExecutionViewResultBlockParamFileType
        
        const BetaTextEditorCodeExecutionViewResultBlockParamFileTypeText BetaTextEditorCodeExecutionViewResultBlockParamFileType = "text"
        
        const BetaTextEditorCodeExecutionViewResultBlockParamFileTypeImage BetaTextEditorCodeExecutionViewResultBlockParamFileType = "image"
        
        const BetaTextEditorCodeExecutionViewResultBlockParamFileTypePDF BetaTextEditorCodeExecutionViewResultBlockParamFileType = "pdf"
        
        Type TextEditorCodeExecutionViewResult
        
        const TextEditorCodeExecutionViewResultTextEditorCodeExecutionViewResult TextEditorCodeExecutionViewResult = "text_editor_code_execution_view_result"
        
        NumLines int64
        
        StartLine int64
        
        TotalLines int64
        
        type BetaTextEditorCodeExecutionCreateResultBlockParamResp struct{…}
        
        IsFileUpdate bool
        
        Type TextEditorCodeExecutionCreateResult
        
        const TextEditorCodeExecutionCreateResultTextEditorCodeExecutionCreateResult TextEditorCodeExecutionCreateResult = "text_editor_code_execution_create_result"
        
        type BetaTextEditorCodeExecutionStrReplaceResultBlockParamResp struct{…}
        
        Type TextEditorCodeExecutionStrReplaceResult
        
        const TextEditorCodeExecutionStrReplaceResultTextEditorCodeExecutionStrReplaceResult TextEditorCodeExecutionStrReplaceResult = "text_editor_code_execution_str_replace_result"
        
        Lines []string
        
        NewLines int64
        
        NewStart int64
        
        OldLines int64
        
        OldStart int64
        
        ToolUseID string
        
        Type TextEditorCodeExecutionToolResult
        
        const TextEditorCodeExecutionToolResultTextEditorCodeExecutionToolResult TextEditorCodeExecutionToolResult = "text_editor_code_execution_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaToolSearchToolResultBlockParamResp struct{…}
        
        Content BetaToolSearchToolResultBlockParamContentUnionResp
        
        type BetaToolSearchToolResultErrorParamResp struct{…}
        
        ErrorCode BetaToolSearchToolResultErrorParamErrorCode
        
        const BetaToolSearchToolResultErrorParamErrorCodeInvalidToolInput BetaToolSearchToolResultErrorParamErrorCode = "invalid_tool_input"
        
        const BetaToolSearchToolResultErrorParamErrorCodeUnavailable BetaToolSearchToolResultErrorParamErrorCode = "unavailable"
        
        const BetaToolSearchToolResultErrorParamErrorCodeTooManyRequests BetaToolSearchToolResultErrorParamErrorCode = "too_many_requests"
        
        const BetaToolSearchToolResultErrorParamErrorCodeExecutionTimeExceeded BetaToolSearchToolResultErrorParamErrorCode = "execution_time_exceeded"
        
        Type ToolSearchToolResultError
        
        const ToolSearchToolResultErrorToolSearchToolResultError ToolSearchToolResultError = "tool_search_tool_result_error"
        
        type BetaToolSearchToolSearchResultBlockParamResp struct{…}
        
        ToolReferences []BetaToolReferenceBlockParamResp
        
        ToolName string
        
        Type ToolReference
        
        const ToolReferenceToolReference ToolReference = "tool_reference"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Type ToolSearchToolSearchResult
        
        const ToolSearchToolSearchResultToolSearchToolSearchResult ToolSearchToolSearchResult = "tool_search_tool_search_result"
        
        ToolUseID string
        
        Type ToolSearchToolResult
        
        const ToolSearchToolResultToolSearchToolResult ToolSearchToolResult = "tool_search_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaMCPToolUseBlockParamResp struct{…}
        
        ID string
        
        Input map[string, any]
        
        Name string
        
        ServerName string
        
        The name of the MCP server
        
        Type MCPToolUse
        
        const MCPToolUseMCPToolUse MCPToolUse = "mcp_tool_use"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaRequestMCPToolResultBlockParamResp struct{…}
        
        ToolUseID string
        
        Type MCPToolResult
        
        const MCPToolResultMCPToolResult MCPToolResult = "mcp_tool_result"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Content BetaRequestMCPToolResultBlockParamContentUnionResp
        
        string
        
        []BetaTextBlockParamResp
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        Citations []BetaTextCitationParamUnionResp
        
        type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        IsError bool
      - type BetaContainerUploadBlockParamResp struct{…}
        
        A content block that represents a file to be uploaded to the container Files uploaded via this block will be available in the container’s input directory.
        
        FileID string
        
        Type ContainerUpload
        
        const ContainerUploadContainerUpload ContainerUpload = "container_upload"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
      - type BetaCompactionBlockParamResp struct{…}
        
        A compaction block containing summary of previous context.
        
        Users should round-trip these blocks from responses to subsequent requests to maintain context across compaction boundaries.
        
        When content is None, the block represents a failed compaction. The server treats these as no-ops. Empty string content is not allowed.
        
        Content string
        
        Summary of previously compacted content, or null if compaction failed
        
        Type Compaction
        
        const CompactionCompaction Compaction = "compaction"
        
        CacheControl BetaCacheControlEphemeral
        
        Create a cache control breakpoint at this content block.
        
        Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
        
        TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
        
        EncryptedContent string
        
        Opaque metadata from prior compaction, to be round-tripped verbatim
  - Role BetaMessageParamRole
    - const BetaMessageParamRoleUser BetaMessageParamRole = "user"
    - const BetaMessageParamRoleAssistant BetaMessageParamRole = "assistant"
- Model param.Field[Model]
  
  Body param: The model that will complete your prompt.
  
  See models for additional details and options.
- CacheControl param.Field[BetaCacheControlEphemeral]
  
  Body param: Top-level cache control automatically applies a cache_control marker to the last cacheable block in the request.
- Container param.Field[BetaMessageNewParamsContainerUnion]
  
  Body param: Container identifier for reuse across requests.
  - type BetaContainerParamsResp struct{…}
    
    Container parameters with skills to be loaded.
    - ID string
      
      Container id
    - Skills []BetaSkillParamsResp
      
      List of skills to load in the container
      - SkillID string
        
        Skill ID
      - Type BetaSkillParamsType
        
        Type of skill - either ‘anthropic’ (built-in) or ‘custom’ (user-defined)
        
        const BetaSkillParamsTypeAnthropic BetaSkillParamsType = "anthropic"
        
        const BetaSkillParamsTypeCustom BetaSkillParamsType = "custom"
      - Version string
        
        Skill version or ‘latest’ for most recent version
  - string
- ContextManagement param.Field[BetaContextManagementConfig]
  
  Body param: Context management configuration.
  
  This allows you to control how Claude manages context across multiple requests, such as whether to clear function results or not.
- InferenceGeo param.Field[string]
  
  Body param: Specifies the geographic region for inference processing. If not specified, the workspace’s default_inference_geo is used.
- MCPServers param.Field[[]BetaRequestMCPServerURLDefinition]
  
  Body param: MCP servers to be utilized in this request
  - Name string
  - Type URL
    - const URLURL URL = "url"
  - URL string
  - AuthorizationToken string
  - ToolConfiguration BetaRequestMCPServerToolConfiguration
    - AllowedTools []string
    - Enabled bool
- Metadata param.Field[BetaMetadata]
  
  Body param: An object describing metadata about the request.
- OutputConfig param.Field[BetaOutputConfig]
  
  Body param: Configuration options for the model’s output, such as the output format.
- OutputFormat param.Field[BetaJSONOutputFormat]
  
  Body param: Deprecated: Use output_config.format instead. See structured outputs
  
  A schema to specify Claude’s output format in responses. This parameter will be removed in a future release.
- ServiceTier param.Field[BetaMessageNewParamsServiceTier]
  
  Body param: Determines whether to use priority capacity (if available) or standard capacity for this request.
  
  Anthropic offers different levels of service for your API requests. See service-tiers for details.
  - const BetaMessageNewParamsServiceTierAuto BetaMessageNewParamsServiceTier = "auto"
  - const BetaMessageNewParamsServiceTierStandardOnly BetaMessageNewParamsServiceTier = "standard_only"
- Speed param.Field[BetaMessageNewParamsSpeed]
  
  Body param: The inference speed mode for this request. "fast" enables high output-tokens-per-second inference.
  - const BetaMessageNewParamsSpeedStandard BetaMessageNewParamsSpeed = "standard"
  - const BetaMessageNewParamsSpeedFast BetaMessageNewParamsSpeed = "fast"
- StopSequences param.Field[[]string]
  
  Body param: Custom text sequences that will cause the model to stop generating.
  
  Our models will normally stop when they have naturally completed their turn, which will result in a response stop_reason of "end_turn".
  
  If you want the model to stop generating when it encounters custom strings of text, you can use the stop_sequences parameter. If the model encounters one of the custom sequences, the response stop_reason value will be "stop_sequence" and the response stop_sequence value will contain the matched stop sequence.
- “
- System param.Field[[]BetaTextBlockParamResp]
  
  Body param: System prompt.
  
  A system prompt is a way of providing context and instructions to Claude, such as specifying a particular goal or role. See our guide to system prompts.
  - []BetaTextBlockParam
    - Text string
    - Type Text
      - const TextText Text = "text"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - Citations []BetaTextCitationParamUnionResp
      - type BetaCitationCharLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
      - type BetaCitationPageLocationParamResp struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
      - type BetaCitationContentBlockLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
      - type BetaCitationWebSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
      - type BetaCitationSearchResultLocationParamResp struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
- Temperature param.Field[float64]
  
  Body param: Amount of randomness injected into the response.
  
  Defaults to 1.0. Ranges from 0.0 to 1.0. Use temperature closer to 0.0 for analytical / multiple choice, and closer to 1.0 for creative and generative tasks.
  
  Note that even with temperature of 0.0, the results will not be fully deterministic.
- Thinking param.Field[BetaThinkingConfigParamUnionResp]
  
  Body param: Configuration for enabling Claude’s extended thinking.
  
  When enabled, responses include thinking content blocks showing Claude’s thinking process before the final answer. Requires a minimum budget of 1,024 tokens and counts towards your max_tokens limit.
  
  See extended thinking for details.
- ToolChoice param.Field[BetaToolChoiceUnion]
  
  Body param: How the model should use the provided tools. The model can use a specific tool, any available tool, decide by itself, or not use tools at all.
- Tools param.Field[[]BetaToolUnion]
  
  Body param: Definitions of tools that the model may use.
  
  If you include tools in your API request, the model may return tool_use content blocks that represent the model’s use of those tools. You can then run those tools using the tool input generated by the model and then optionally return results back to the model using tool_result content blocks.
  
  There are two types of tools: client tools and server tools. The behavior described below applies to client tools. For server tools, see their individual documentation as each has its own behavior (e.g., the web search tool).
  
  Each tool definition includes:
  - name: Name of the tool.
  - description: Optional, but strongly-recommended description of the tool.
  - input_schema: JSON schema for the tool input shape that the model will produce in tool_use output content blocks.
  For example, if you defined tools as:
```
[
  {
    "name": "get_stock_price",
    "description": "Get the current stock price for a given ticker symbol.",
    "input_schema": {
      "type": "object",
      "properties": {
        "ticker": {
          "type": "string",
          "description": "The stock ticker symbol, e.g. AAPL for Apple Inc."
        }
      },
      "required": ["ticker"]
    }
  }
]
```
  And then asked the model “What’s the S&P 500 at today?”, the model might produce tool_use content blocks in the response like this:
```
[
  {
    "type": "tool_use",
    "id": "toolu_01D7FLrfh4GYq7yT1ULFeyMV",
    "name": "get_stock_price",
    "input": { "ticker": "^GSPC" }
  }
]
```
  You might then run your get_stock_price tool with {"ticker": "^GSPC"} as an input, and return the following back to the model in a subsequent user message:
```
[
  {
    "type": "tool_result",
    "tool_use_id": "toolu_01D7FLrfh4GYq7yT1ULFeyMV",
    "content": "259.75 USD"
  }
]
```
  Tools can be used for workflows that include running client-side tools and functions, or more generally whenever you want the model to produce a particular JSON structure of output.
  
  See our guide for more details.
  - type BetaTool struct{…}
    - InputSchema BetaToolInputSchema
      
      JSON schema for this tool’s input.
      
      This defines the shape of the input that your tool accepts and that the model will produce.
      - Type Object
        
        const ObjectObject Object = "object"
      - Properties map[string, any]
      - Required []string
    - Name string
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
    - AllowedCallers []string
      - const BetaToolAllowedCallerDirect BetaToolAllowedCaller = "direct"
      - const BetaToolAllowedCallerCodeExecution20250825 BetaToolAllowedCaller = "code_execution_20250825"
      - const BetaToolAllowedCallerCodeExecution20260120 BetaToolAllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - Description string
      
      Description of what this tool does.
      
      Tool descriptions should be as detailed as possible. The more information that the model has about what the tool is and how to use it, the better it will perform. You can use natural language descriptions to reinforce important aspects of the tool input JSON schema.
    - EagerInputStreaming bool
      
      Enable eager input streaming for this tool. When true, tool input parameters will be streamed incrementally as they are generated, and types will be inferred on-the-fly rather than buffering the full JSON output. When false, streaming is disabled for this tool even if the fine-grained-tool-streaming beta is active. When null (default), uses the default behavior based on beta headers.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
    - Type BetaToolType
      - const BetaToolTypeCustom BetaToolType = "custom"
  - type BetaToolBash20241022 struct{…}
    - Name Bash
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const BashBash Bash = "bash"
    - Type Bash20241022
      - const Bash20241022Bash20241022 Bash20241022 = "bash_20241022"
    - AllowedCallers []string
      - const BetaToolBash20241022AllowedCallerDirect BetaToolBash20241022AllowedCaller = "direct"
      - const BetaToolBash20241022AllowedCallerCodeExecution20250825 BetaToolBash20241022AllowedCaller = "code_execution_20250825"
      - const BetaToolBash20241022AllowedCallerCodeExecution20260120 BetaToolBash20241022AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolBash20250124 struct{…}
    - Name Bash
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const BashBash Bash = "bash"
    - Type Bash20250124
      - const Bash20250124Bash20250124 Bash20250124 = "bash_20250124"
    - AllowedCallers []string
      - const BetaToolBash20250124AllowedCallerDirect BetaToolBash20250124AllowedCaller = "direct"
      - const BetaToolBash20250124AllowedCallerCodeExecution20250825 BetaToolBash20250124AllowedCaller = "code_execution_20250825"
      - const BetaToolBash20250124AllowedCallerCodeExecution20260120 BetaToolBash20250124AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaCodeExecutionTool20250522 struct{…}
    - Name CodeExecution
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const CodeExecutionCodeExecution CodeExecution = "code_execution"
    - Type CodeExecution20250522
      - const CodeExecution20250522CodeExecution20250522 CodeExecution20250522 = "code_execution_20250522"
    - AllowedCallers []string
      - const BetaCodeExecutionTool20250522AllowedCallerDirect BetaCodeExecutionTool20250522AllowedCaller = "direct"
      - const BetaCodeExecutionTool20250522AllowedCallerCodeExecution20250825 BetaCodeExecutionTool20250522AllowedCaller = "code_execution_20250825"
      - const BetaCodeExecutionTool20250522AllowedCallerCodeExecution20260120 BetaCodeExecutionTool20250522AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaCodeExecutionTool20250825 struct{…}
    - Name CodeExecution
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const CodeExecutionCodeExecution CodeExecution = "code_execution"
    - Type CodeExecution20250825
      - const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
    - AllowedCallers []string
      - const BetaCodeExecutionTool20250825AllowedCallerDirect BetaCodeExecutionTool20250825AllowedCaller = "direct"
      - const BetaCodeExecutionTool20250825AllowedCallerCodeExecution20250825 BetaCodeExecutionTool20250825AllowedCaller = "code_execution_20250825"
      - const BetaCodeExecutionTool20250825AllowedCallerCodeExecution20260120 BetaCodeExecutionTool20250825AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaCodeExecutionTool20260120 struct{…}
    
    Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint).
    - Name CodeExecution
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const CodeExecutionCodeExecution CodeExecution = "code_execution"
    - Type CodeExecution20260120
      - const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
    - AllowedCallers []string
      - const BetaCodeExecutionTool20260120AllowedCallerDirect BetaCodeExecutionTool20260120AllowedCaller = "direct"
      - const BetaCodeExecutionTool20260120AllowedCallerCodeExecution20250825 BetaCodeExecutionTool20260120AllowedCaller = "code_execution_20250825"
      - const BetaCodeExecutionTool20260120AllowedCallerCodeExecution20260120 BetaCodeExecutionTool20260120AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolComputerUse20241022 struct{…}
    - DisplayHeightPx int64
      
      The height of the display in pixels.
    - DisplayWidthPx int64
      
      The width of the display in pixels.
    - Name Computer
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const ComputerComputer Computer = "computer"
    - Type Computer20241022
      - const Computer20241022Computer20241022 Computer20241022 = "computer_20241022"
    - AllowedCallers []string
      - const BetaToolComputerUse20241022AllowedCallerDirect BetaToolComputerUse20241022AllowedCaller = "direct"
      - const BetaToolComputerUse20241022AllowedCallerCodeExecution20250825 BetaToolComputerUse20241022AllowedCaller = "code_execution_20250825"
      - const BetaToolComputerUse20241022AllowedCallerCodeExecution20260120 BetaToolComputerUse20241022AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - DisplayNumber int64
      
      The X11 display number (e.g. 0, 1) for the display.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaMemoryTool20250818 struct{…}
    - Name Memory
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const MemoryMemory Memory = "memory"
    - Type Memory20250818
      - const Memory20250818Memory20250818 Memory20250818 = "memory_20250818"
    - AllowedCallers []string
      - const BetaMemoryTool20250818AllowedCallerDirect BetaMemoryTool20250818AllowedCaller = "direct"
      - const BetaMemoryTool20250818AllowedCallerCodeExecution20250825 BetaMemoryTool20250818AllowedCaller = "code_execution_20250825"
      - const BetaMemoryTool20250818AllowedCallerCodeExecution20260120 BetaMemoryTool20250818AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolComputerUse20250124 struct{…}
    - DisplayHeightPx int64
      
      The height of the display in pixels.
    - DisplayWidthPx int64
      
      The width of the display in pixels.
    - Name Computer
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const ComputerComputer Computer = "computer"
    - Type Computer20250124
      - const Computer20250124Computer20250124 Computer20250124 = "computer_20250124"
    - AllowedCallers []string
      - const BetaToolComputerUse20250124AllowedCallerDirect BetaToolComputerUse20250124AllowedCaller = "direct"
      - const BetaToolComputerUse20250124AllowedCallerCodeExecution20250825 BetaToolComputerUse20250124AllowedCaller = "code_execution_20250825"
      - const BetaToolComputerUse20250124AllowedCallerCodeExecution20260120 BetaToolComputerUse20250124AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - DisplayNumber int64
      
      The X11 display number (e.g. 0, 1) for the display.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolTextEditor20241022 struct{…}
    - Name StrReplaceEditor
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const StrReplaceEditorStrReplaceEditor StrReplaceEditor = "str_replace_editor"
    - Type TextEditor20241022
      - const TextEditor20241022TextEditor20241022 TextEditor20241022 = "text_editor_20241022"
    - AllowedCallers []string
      - const BetaToolTextEditor20241022AllowedCallerDirect BetaToolTextEditor20241022AllowedCaller = "direct"
      - const BetaToolTextEditor20241022AllowedCallerCodeExecution20250825 BetaToolTextEditor20241022AllowedCaller = "code_execution_20250825"
      - const BetaToolTextEditor20241022AllowedCallerCodeExecution20260120 BetaToolTextEditor20241022AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolComputerUse20251124 struct{…}
    - DisplayHeightPx int64
      
      The height of the display in pixels.
    - DisplayWidthPx int64
      
      The width of the display in pixels.
    - Name Computer
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const ComputerComputer Computer = "computer"
    - Type Computer20251124
      - const Computer20251124Computer20251124 Computer20251124 = "computer_20251124"
    - AllowedCallers []string
      - const BetaToolComputerUse20251124AllowedCallerDirect BetaToolComputerUse20251124AllowedCaller = "direct"
      - const BetaToolComputerUse20251124AllowedCallerCodeExecution20250825 BetaToolComputerUse20251124AllowedCaller = "code_execution_20250825"
      - const BetaToolComputerUse20251124AllowedCallerCodeExecution20260120 BetaToolComputerUse20251124AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - DisplayNumber int64
      
      The X11 display number (e.g. 0, 1) for the display.
    - EnableZoom bool
      
      Whether to enable an action to take a zoomed-in screenshot of the screen.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolTextEditor20250124 struct{…}
    - Name StrReplaceEditor
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const StrReplaceEditorStrReplaceEditor StrReplaceEditor = "str_replace_editor"
    - Type TextEditor20250124
      - const TextEditor20250124TextEditor20250124 TextEditor20250124 = "text_editor_20250124"
    - AllowedCallers []string
      - const BetaToolTextEditor20250124AllowedCallerDirect BetaToolTextEditor20250124AllowedCaller = "direct"
      - const BetaToolTextEditor20250124AllowedCallerCodeExecution20250825 BetaToolTextEditor20250124AllowedCaller = "code_execution_20250825"
      - const BetaToolTextEditor20250124AllowedCallerCodeExecution20260120 BetaToolTextEditor20250124AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolTextEditor20250429 struct{…}
    - Name StrReplaceBasedEditTool
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const StrReplaceBasedEditToolStrReplaceBasedEditTool StrReplaceBasedEditTool = "str_replace_based_edit_tool"
    - Type TextEditor20250429
      - const TextEditor20250429TextEditor20250429 TextEditor20250429 = "text_editor_20250429"
    - AllowedCallers []string
      - const BetaToolTextEditor20250429AllowedCallerDirect BetaToolTextEditor20250429AllowedCaller = "direct"
      - const BetaToolTextEditor20250429AllowedCallerCodeExecution20250825 BetaToolTextEditor20250429AllowedCaller = "code_execution_20250825"
      - const BetaToolTextEditor20250429AllowedCallerCodeExecution20260120 BetaToolTextEditor20250429AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolTextEditor20250728 struct{…}
    - Name StrReplaceBasedEditTool
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const StrReplaceBasedEditToolStrReplaceBasedEditTool StrReplaceBasedEditTool = "str_replace_based_edit_tool"
    - Type TextEditor20250728
      - const TextEditor20250728TextEditor20250728 TextEditor20250728 = "text_editor_20250728"
    - AllowedCallers []string
      - const BetaToolTextEditor20250728AllowedCallerDirect BetaToolTextEditor20250728AllowedCaller = "direct"
      - const BetaToolTextEditor20250728AllowedCallerCodeExecution20250825 BetaToolTextEditor20250728AllowedCaller = "code_execution_20250825"
      - const BetaToolTextEditor20250728AllowedCallerCodeExecution20260120 BetaToolTextEditor20250728AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - InputExamples []map[string, any]
    - MaxCharacters int64
      
      Maximum number of characters to display when viewing a file. If not specified, defaults to displaying the full file.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaWebSearchTool20250305 struct{…}
    - Name WebSearch
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const WebSearchWebSearch WebSearch = "web_search"
    - Type WebSearch20250305
      - const WebSearch20250305WebSearch20250305 WebSearch20250305 = "web_search_20250305"
    - AllowedCallers []string
      - const BetaWebSearchTool20250305AllowedCallerDirect BetaWebSearchTool20250305AllowedCaller = "direct"
      - const BetaWebSearchTool20250305AllowedCallerCodeExecution20250825 BetaWebSearchTool20250305AllowedCaller = "code_execution_20250825"
      - const BetaWebSearchTool20250305AllowedCallerCodeExecution20260120 BetaWebSearchTool20250305AllowedCaller = "code_execution_20260120"
    - AllowedDomains []string
      
      If provided, only these domains will be included in results. Cannot be used alongside blocked_domains.
    - BlockedDomains []string
      
      If provided, these domains will never appear in results. Cannot be used alongside allowed_domains.
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - MaxUses int64
      
      Maximum number of times the tool can be used in the API request.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
    - UserLocation BetaUserLocation
      
      Parameters for the user’s location. Used to provide more relevant search results.
      - Type Approximate
        
        const ApproximateApproximate Approximate = "approximate"
      - City string
        
        The city of the user.
      - Country string
        
        The two letter ISO country code of the user.
      - Region string
        
        The region of the user.
      - Timezone string
        
        The IANA timezone of the user.
  - type BetaWebFetchTool20250910 struct{…}
    - Name WebFetch
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const WebFetchWebFetch WebFetch = "web_fetch"
    - Type WebFetch20250910
      - const WebFetch20250910WebFetch20250910 WebFetch20250910 = "web_fetch_20250910"
    - AllowedCallers []string
      - const BetaWebFetchTool20250910AllowedCallerDirect BetaWebFetchTool20250910AllowedCaller = "direct"
      - const BetaWebFetchTool20250910AllowedCallerCodeExecution20250825 BetaWebFetchTool20250910AllowedCaller = "code_execution_20250825"
      - const BetaWebFetchTool20250910AllowedCallerCodeExecution20260120 BetaWebFetchTool20250910AllowedCaller = "code_execution_20260120"
    - AllowedDomains []string
      
      List of domains to allow fetching from
    - BlockedDomains []string
      
      List of domains to block fetching from
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - Citations BetaCitationsConfigParamResp
      
      Citations configuration for fetched documents. Citations are disabled by default.
      - Enabled bool
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - MaxContentTokens int64
      
      Maximum number of tokens used by including web page text content in the context. The limit is approximate and does not apply to binary content such as PDFs.
    - MaxUses int64
      
      Maximum number of times the tool can be used in the API request.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaWebSearchTool20260209 struct{…}
    - Name WebSearch
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const WebSearchWebSearch WebSearch = "web_search"
    - Type WebSearch20260209
      - const WebSearch20260209WebSearch20260209 WebSearch20260209 = "web_search_20260209"
    - AllowedCallers []string
      - const BetaWebSearchTool20260209AllowedCallerDirect BetaWebSearchTool20260209AllowedCaller = "direct"
      - const BetaWebSearchTool20260209AllowedCallerCodeExecution20250825 BetaWebSearchTool20260209AllowedCaller = "code_execution_20250825"
      - const BetaWebSearchTool20260209AllowedCallerCodeExecution20260120 BetaWebSearchTool20260209AllowedCaller = "code_execution_20260120"
    - AllowedDomains []string
      
      If provided, only these domains will be included in results. Cannot be used alongside blocked_domains.
    - BlockedDomains []string
      
      If provided, these domains will never appear in results. Cannot be used alongside allowed_domains.
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - MaxUses int64
      
      Maximum number of times the tool can be used in the API request.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
    - UserLocation BetaUserLocation
      
      Parameters for the user’s location. Used to provide more relevant search results.
      - Type Approximate
        
        const ApproximateApproximate Approximate = "approximate"
      - City string
        
        The city of the user.
      - Country string
        
        The two letter ISO country code of the user.
      - Region string
        
        The region of the user.
      - Timezone string
        
        The IANA timezone of the user.
  - type BetaWebFetchTool20260209 struct{…}
    - Name WebFetch
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const WebFetchWebFetch WebFetch = "web_fetch"
    - Type WebFetch20260209
      - const WebFetch20260209WebFetch20260209 WebFetch20260209 = "web_fetch_20260209"
    - AllowedCallers []string
      - const BetaWebFetchTool20260209AllowedCallerDirect BetaWebFetchTool20260209AllowedCaller = "direct"
      - const BetaWebFetchTool20260209AllowedCallerCodeExecution20250825 BetaWebFetchTool20260209AllowedCaller = "code_execution_20250825"
      - const BetaWebFetchTool20260209AllowedCallerCodeExecution20260120 BetaWebFetchTool20260209AllowedCaller = "code_execution_20260120"
    - AllowedDomains []string
      
      List of domains to allow fetching from
    - BlockedDomains []string
      
      List of domains to block fetching from
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - Citations BetaCitationsConfigParamResp
      
      Citations configuration for fetched documents. Citations are disabled by default.
      - Enabled bool
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - MaxContentTokens int64
      
      Maximum number of tokens used by including web page text content in the context. The limit is approximate and does not apply to binary content such as PDFs.
    - MaxUses int64
      
      Maximum number of times the tool can be used in the API request.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaWebFetchTool20260309 struct{…}
    
    Web fetch tool with use_cache parameter for bypassing cached content.
    - Name WebFetch
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const WebFetchWebFetch WebFetch = "web_fetch"
    - Type WebFetch20260309
      - const WebFetch20260309WebFetch20260309 WebFetch20260309 = "web_fetch_20260309"
    - AllowedCallers []string
      - const BetaWebFetchTool20260309AllowedCallerDirect BetaWebFetchTool20260309AllowedCaller = "direct"
      - const BetaWebFetchTool20260309AllowedCallerCodeExecution20250825 BetaWebFetchTool20260309AllowedCaller = "code_execution_20250825"
      - const BetaWebFetchTool20260309AllowedCallerCodeExecution20260120 BetaWebFetchTool20260309AllowedCaller = "code_execution_20260120"
    - AllowedDomains []string
      
      List of domains to allow fetching from
    - BlockedDomains []string
      
      List of domains to block fetching from
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - Citations BetaCitationsConfigParamResp
      
      Citations configuration for fetched documents. Citations are disabled by default.
      - Enabled bool
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - MaxContentTokens int64
      
      Maximum number of tokens used by including web page text content in the context. The limit is approximate and does not apply to binary content such as PDFs.
    - MaxUses int64
      
      Maximum number of times the tool can be used in the API request.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
    - UseCache bool
      
      Whether to use cached content. Set to false to bypass the cache and fetch fresh content. Only set to false when the user explicitly requests fresh content or when fetching rapidly-changing sources.
  - type BetaAdvisorTool20260301 struct{…}
    - Model Model
      
      The model that will complete your prompt.
      
      See models for additional details and options.
      - type Model string
        
        The model that will complete your prompt.
        
        See models for additional details and options.
        
        const ModelClaudeOpus4_7 Model = "claude-opus-4-7"
        
        Frontier intelligence for long-running agents and coding
        
        const ModelClaudeMythosPreview Model = "claude-mythos-preview"
        
        New class of intelligence, strongest in coding and cybersecurity
        
        const ModelClaudeOpus4_6 Model = "claude-opus-4-6"
        
        Frontier intelligence for long-running agents and coding
        
        const ModelClaudeSonnet4_6 Model = "claude-sonnet-4-6"
        
        Best combination of speed and intelligence
        
        const ModelClaudeHaiku4_5 Model = "claude-haiku-4-5"
        
        Fastest model with near-frontier intelligence
        
        const ModelClaudeHaiku4_5_20251001 Model = "claude-haiku-4-5-20251001"
        
        Fastest model with near-frontier intelligence
        
        const ModelClaudeOpus4_5 Model = "claude-opus-4-5"
        
        Premium model combining maximum intelligence with practical performance
        
        const ModelClaudeOpus4_5_20251101 Model = "claude-opus-4-5-20251101"
        
        Premium model combining maximum intelligence with practical performance
        
        const ModelClaudeSonnet4_5 Model = "claude-sonnet-4-5"
        
        High-performance model for agents and coding
        
        const ModelClaudeSonnet4_5_20250929 Model = "claude-sonnet-4-5-20250929"
        
        High-performance model for agents and coding
        
        const ModelClaudeOpus4_1 Model = "claude-opus-4-1"
        
        Exceptional model for specialized complex tasks
        
        const ModelClaudeOpus4_1_20250805 Model = "claude-opus-4-1-20250805"
        
        Exceptional model for specialized complex tasks
        
        const ModelClaudeOpus4_0 Model = "claude-opus-4-0"
        
        Powerful model for complex tasks
        
        const ModelClaudeOpus4_20250514 Model = "claude-opus-4-20250514"
        
        Powerful model for complex tasks
        
        const ModelClaudeSonnet4_0 Model = "claude-sonnet-4-0"
        
        High-performance model with extended thinking
        
        const ModelClaudeSonnet4_20250514 Model = "claude-sonnet-4-20250514"
        
        High-performance model with extended thinking
        
        const ModelClaude_3_Haiku_20240307 Model = "claude-3-haiku-20240307"
        
        Fast and cost-effective model
      - string
    - Name Advisor
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const AdvisorAdvisor Advisor = "advisor"
    - Type Advisor20260301
      - const Advisor20260301Advisor20260301 Advisor20260301 = "advisor_20260301"
    - AllowedCallers []string
      - const BetaAdvisorTool20260301AllowedCallerDirect BetaAdvisorTool20260301AllowedCaller = "direct"
      - const BetaAdvisorTool20260301AllowedCallerCodeExecution20250825 BetaAdvisorTool20260301AllowedCaller = "code_execution_20250825"
      - const BetaAdvisorTool20260301AllowedCallerCodeExecution20260120 BetaAdvisorTool20260301AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - Caching BetaCacheControlEphemeral
      
      Caching for the advisor’s own prompt. When set, each advisor call writes a cache entry at the given TTL so subsequent calls in the same conversation read the stable prefix. When omitted, the advisor prompt is not cached.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - MaxUses int64
      
      Maximum number of times the tool can be used in the API request.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolSearchToolBm25_20251119 struct{…}
    - Name ToolSearchToolBm25
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const ToolSearchToolBm25ToolSearchToolBm25 ToolSearchToolBm25 = "tool_search_tool_bm25"
    - Type BetaToolSearchToolBm25_20251119Type
      - const BetaToolSearchToolBm25_20251119TypeToolSearchToolBm25_20251119 BetaToolSearchToolBm25_20251119Type = "tool_search_tool_bm25_20251119"
      - const BetaToolSearchToolBm25_20251119TypeToolSearchToolBm25 BetaToolSearchToolBm25_20251119Type = "tool_search_tool_bm25"
    - AllowedCallers []string
      - const BetaToolSearchToolBm25_20251119AllowedCallerDirect BetaToolSearchToolBm25_20251119AllowedCaller = "direct"
      - const BetaToolSearchToolBm25_20251119AllowedCallerCodeExecution20250825 BetaToolSearchToolBm25_20251119AllowedCaller = "code_execution_20250825"
      - const BetaToolSearchToolBm25_20251119AllowedCallerCodeExecution20260120 BetaToolSearchToolBm25_20251119AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaToolSearchToolRegex20251119 struct{…}
    - Name ToolSearchToolRegex
      
      Name of the tool.
      
      This is how the tool will be called by the model and in tool_use blocks.
      - const ToolSearchToolRegexToolSearchToolRegex ToolSearchToolRegex = "tool_search_tool_regex"
    - Type BetaToolSearchToolRegex20251119Type
      - const BetaToolSearchToolRegex20251119TypeToolSearchToolRegex20251119 BetaToolSearchToolRegex20251119Type = "tool_search_tool_regex_20251119"
      - const BetaToolSearchToolRegex20251119TypeToolSearchToolRegex BetaToolSearchToolRegex20251119Type = "tool_search_tool_regex"
    - AllowedCallers []string
      - const BetaToolSearchToolRegex20251119AllowedCallerDirect BetaToolSearchToolRegex20251119AllowedCaller = "direct"
      - const BetaToolSearchToolRegex20251119AllowedCallerCodeExecution20250825 BetaToolSearchToolRegex20251119AllowedCaller = "code_execution_20250825"
      - const BetaToolSearchToolRegex20251119AllowedCallerCodeExecution20260120 BetaToolSearchToolRegex20251119AllowedCaller = "code_execution_20260120"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - DeferLoading bool
      
      If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.
    - Strict bool
      
      When true, guarantees schema validation on tool names and inputs
  - type BetaMCPToolset struct{…}
    
    Configuration for a group of tools from an MCP server.
    
    Allows configuring enabled status and defer_loading for all tools from an MCP server, with optional per-tool overrides.
    - MCPServerName string
      
      Name of the MCP server to configure tools for
    - Type MCPToolset
      - const MCPToolsetMCPToolset MCPToolset = "mcp_toolset"
    - CacheControl BetaCacheControlEphemeral
      
      Create a cache control breakpoint at this content block.
      - Type Ephemeral
        
        const EphemeralEphemeral Ephemeral = "ephemeral"
      - TTL BetaCacheControlEphemeralTTL
        
        The time-to-live for the cache control breakpoint.
        
        This may be one the following values:
        
        5m: 5 minutes
        
        1h: 1 hour
        
        Defaults to 5m.
        
        const BetaCacheControlEphemeralTTLTTL5m BetaCacheControlEphemeralTTL = "5m"
        
        const BetaCacheControlEphemeralTTLTTL1h BetaCacheControlEphemeralTTL = "1h"
    - Configs map[string, BetaMCPToolConfig]
      
      Configuration overrides for specific tools, keyed by tool name
      - DeferLoading bool
      - Enabled bool
    - DefaultConfig BetaMCPToolDefaultConfig
      
      Default configuration applied to all tools from this server
      - DeferLoading bool
      - Enabled bool
- TopK param.Field[int64]
  
  Body param: Only sample from the top K options for each subsequent token.
  
  Used to remove “long tail” low probability responses. Learn more technical details here.
  
  Recommended for advanced use cases only.
- TopP param.Field[float64]
  
  Body param: Use nucleus sampling.
  
  In nucleus sampling, we compute the cumulative distribution over all the options for each subsequent token in decreasing probability order and cut it off once it reaches a particular probability specified by top_p.
  
  Recommended for advanced use cases only.
- UserProfileID param.Field[string]
  
  Body param: The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization.
- Betas param.Field[[]AnthropicBeta]
  
  Header param: Optional header to specify the beta version(s) you want to use.
  - string
  - type AnthropicBeta string
    - const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"
    - const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"
    - const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"
    - const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"
    - const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"
    - const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"
    - const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"
    - const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"
    - const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"
    - const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"
    - const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"
    - const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"
    - const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"
    - const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"
    - const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"
    - const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"
    - const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"
    - const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"
    - const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"
    - const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"
    - const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"
    - const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"
    - const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"
    - const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"

Returns

type BetaMessage struct{…}
- ID string
  
  Unique object identifier.
  
  The format and length of IDs may change over time.
- Container BetaContainer
  
  Information about the container used in the request (for the code execution tool)
  - ID string
    
    Identifier for the container used in this request
  - ExpiresAt Time
    
    The time at which the container will expire.
  - Skills []BetaSkill
    
    Skills loaded in the container
    - SkillID string
      
      Skill ID
    - Type BetaSkillType
      
      Type of skill - either ‘anthropic’ (built-in) or ‘custom’ (user-defined)
      - const BetaSkillTypeAnthropic BetaSkillType = "anthropic"
      - const BetaSkillTypeCustom BetaSkillType = "custom"
    - Version string
      
      Skill version or ‘latest’ for most recent version
- Content []BetaContentBlockUnion
  
  Content generated by the model.
  
  This is an array of content blocks, each of which has a type that determines its shape.
  
  Example:
```
[{"type": "text", "text": "Hi, I'm Claude."}]
```
  If the request input messages ended with an assistant turn, then the response content will continue directly from that last turn. You can use this to constrain the model’s output.
  
  For example, if the input messages were:
```
[
  {"role": "user", "content": "What's the Greek name for Sun? (A) Sol (B) Helios (C) Sun"},
  {"role": "assistant", "content": "The best answer is ("}
]
```
  Then the response content might be:
```
[{"type": "text", "text": "B)"}]
```
  - type BetaTextBlock struct{…}
    - Citations []BetaTextCitationUnion
      
      Citations supporting the text block.
      
      The type of citation returned will depend on the type of document being cited. Citing a PDF results in page_location, plain text results in char_location, and content document results in content_block_location.
      - type BetaCitationCharLocation struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        FileID string
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
      - type BetaCitationPageLocation struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        FileID string
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
      - type BetaCitationContentBlockLocation struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        FileID string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
      - type BetaCitationsWebSearchResultLocation struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
      - type BetaCitationSearchResultLocation struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
    - Text string
    - Type Text
      - const TextText Text = "text"
  - type BetaThinkingBlock struct{…}
    - Signature string
    - Thinking string
    - Type Thinking
      - const ThinkingThinking Thinking = "thinking"
  - type BetaRedactedThinkingBlock struct{…}
    - Data string
    - Type RedactedThinking
      - const RedactedThinkingRedactedThinking RedactedThinking = "redacted_thinking"
  - type BetaToolUseBlock struct{…}
    - ID string
    - Input map[string, any]
    - Name string
    - Type ToolUse
      - const ToolUseToolUse ToolUse = "tool_use"
    - Caller BetaToolUseBlockCallerUnion
      
      Tool invocation directly from the model.
      - type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
      - type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
      - type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
  - type BetaServerToolUseBlock struct{…}
    - ID string
    - Input map[string, any]
    - Name BetaServerToolUseBlockName
      - const BetaServerToolUseBlockNameAdvisor BetaServerToolUseBlockName = "advisor"
      - const BetaServerToolUseBlockNameWebSearch BetaServerToolUseBlockName = "web_search"
      - const BetaServerToolUseBlockNameWebFetch BetaServerToolUseBlockName = "web_fetch"
      - const BetaServerToolUseBlockNameCodeExecution BetaServerToolUseBlockName = "code_execution"
      - const BetaServerToolUseBlockNameBashCodeExecution BetaServerToolUseBlockName = "bash_code_execution"
      - const BetaServerToolUseBlockNameTextEditorCodeExecution BetaServerToolUseBlockName = "text_editor_code_execution"
      - const BetaServerToolUseBlockNameToolSearchToolRegex BetaServerToolUseBlockName = "tool_search_tool_regex"
      - const BetaServerToolUseBlockNameToolSearchToolBm25 BetaServerToolUseBlockName = "tool_search_tool_bm25"
    - Type ServerToolUse
      - const ServerToolUseServerToolUse ServerToolUse = "server_tool_use"
    - Caller BetaServerToolUseBlockCallerUnion
      
      Tool invocation directly from the model.
      - type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
      - type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
      - type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
  - type BetaWebSearchToolResultBlock struct{…}
    - Content BetaWebSearchToolResultBlockContentUnion
      - type BetaWebSearchToolResultError struct{…}
        
        ErrorCode BetaWebSearchToolResultErrorCode
        
        const BetaWebSearchToolResultErrorCodeInvalidToolInput BetaWebSearchToolResultErrorCode = "invalid_tool_input"
        
        const BetaWebSearchToolResultErrorCodeUnavailable BetaWebSearchToolResultErrorCode = "unavailable"
        
        const BetaWebSearchToolResultErrorCodeMaxUsesExceeded BetaWebSearchToolResultErrorCode = "max_uses_exceeded"
        
        const BetaWebSearchToolResultErrorCodeTooManyRequests BetaWebSearchToolResultErrorCode = "too_many_requests"
        
        const BetaWebSearchToolResultErrorCodeQueryTooLong BetaWebSearchToolResultErrorCode = "query_too_long"
        
        const BetaWebSearchToolResultErrorCodeRequestTooLarge BetaWebSearchToolResultErrorCode = "request_too_large"
        
        Type WebSearchToolResultError
        
        const WebSearchToolResultErrorWebSearchToolResultError WebSearchToolResultError = "web_search_tool_result_error"
      - type BetaWebSearchToolResultBlockContentArray []BetaWebSearchResultBlock
        
        EncryptedContent string
        
        PageAge string
        
        Title string
        
        Type WebSearchResult
        
        const WebSearchResultWebSearchResult WebSearchResult = "web_search_result"
        
        URL string
    - ToolUseID string
    - Type WebSearchToolResult
      - const WebSearchToolResultWebSearchToolResult WebSearchToolResult = "web_search_tool_result"
    - Caller BetaWebSearchToolResultBlockCallerUnion
      
      Tool invocation directly from the model.
      - type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
      - type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
      - type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
  - type BetaWebFetchToolResultBlock struct{…}
    - Content BetaWebFetchToolResultBlockContentUnion
      - type BetaWebFetchToolResultErrorBlock struct{…}
        
        ErrorCode BetaWebFetchToolResultErrorCode
        
        const BetaWebFetchToolResultErrorCodeInvalidToolInput BetaWebFetchToolResultErrorCode = "invalid_tool_input"
        
        const BetaWebFetchToolResultErrorCodeURLTooLong BetaWebFetchToolResultErrorCode = "url_too_long"
        
        const BetaWebFetchToolResultErrorCodeURLNotAllowed BetaWebFetchToolResultErrorCode = "url_not_allowed"
        
        const BetaWebFetchToolResultErrorCodeURLNotAccessible BetaWebFetchToolResultErrorCode = "url_not_accessible"
        
        const BetaWebFetchToolResultErrorCodeUnsupportedContentType BetaWebFetchToolResultErrorCode = "unsupported_content_type"
        
        const BetaWebFetchToolResultErrorCodeTooManyRequests BetaWebFetchToolResultErrorCode = "too_many_requests"
        
        const BetaWebFetchToolResultErrorCodeMaxUsesExceeded BetaWebFetchToolResultErrorCode = "max_uses_exceeded"
        
        const BetaWebFetchToolResultErrorCodeUnavailable BetaWebFetchToolResultErrorCode = "unavailable"
        
        Type WebFetchToolResultError
        
        const WebFetchToolResultErrorWebFetchToolResultError WebFetchToolResultError = "web_fetch_tool_result_error"
      - type BetaWebFetchBlock struct{…}
        
        Content BetaDocumentBlock
        
        Citations BetaCitationConfig
        
        Citation configuration for the document
        
        Enabled bool
        
        Source BetaDocumentBlockSourceUnion
        
        type BetaBase64PDFSource struct{…}
        
        Data string
        
        MediaType ApplicationPDF
        
        const ApplicationPDFApplicationPDF ApplicationPDF = "application/pdf"
        
        Type Base64
        
        const Base64Base64 Base64 = "base64"
        
        type BetaPlainTextSource struct{…}
        
        Data string
        
        MediaType TextPlain
        
        const TextPlainTextPlain TextPlain = "text/plain"
        
        Type Text
        
        const TextText Text = "text"
        
        Title string
        
        The title of the document
        
        Type Document
        
        const DocumentDocument Document = "document"
        
        RetrievedAt string
        
        ISO 8601 timestamp when the content was retrieved
        
        Type WebFetchResult
        
        const WebFetchResultWebFetchResult WebFetchResult = "web_fetch_result"
        
        URL string
        
        Fetched content URL
    - ToolUseID string
    - Type WebFetchToolResult
      - const WebFetchToolResultWebFetchToolResult WebFetchToolResult = "web_fetch_tool_result"
    - Caller BetaWebFetchToolResultBlockCallerUnion
      
      Tool invocation directly from the model.
      - type BetaDirectCaller struct{…}
        
        Tool invocation directly from the model.
        
        Type Direct
        
        const DirectDirect Direct = "direct"
      - type BetaServerToolCaller struct{…}
        
        Tool invocation generated by a server-side tool.
        
        ToolID string
        
        Type CodeExecution20250825
        
        const CodeExecution20250825CodeExecution20250825 CodeExecution20250825 = "code_execution_20250825"
      - type BetaServerToolCaller20260120 struct{…}
        
        ToolID string
        
        Type CodeExecution20260120
        
        const CodeExecution20260120CodeExecution20260120 CodeExecution20260120 = "code_execution_20260120"
  - type BetaAdvisorToolResultBlock struct{…}
    - Content BetaAdvisorToolResultBlockContentUnion
      - type BetaAdvisorToolResultError struct{…}
        
        ErrorCode BetaAdvisorToolResultErrorErrorCode
        
        const BetaAdvisorToolResultErrorErrorCodeMaxUsesExceeded BetaAdvisorToolResultErrorErrorCode = "max_uses_exceeded"
        
        const BetaAdvisorToolResultErrorErrorCodePromptTooLong BetaAdvisorToolResultErrorErrorCode = "prompt_too_long"
        
        const BetaAdvisorToolResultErrorErrorCodeTooManyRequests BetaAdvisorToolResultErrorErrorCode = "too_many_requests"
        
        const BetaAdvisorToolResultErrorErrorCodeOverloaded BetaAdvisorToolResultErrorErrorCode = "overloaded"
        
        const BetaAdvisorToolResultErrorErrorCodeUnavailable BetaAdvisorToolResultErrorErrorCode = "unavailable"
        
        const BetaAdvisorToolResultErrorErrorCodeExecutionTimeExceeded BetaAdvisorToolResultErrorErrorCode = "execution_time_exceeded"
        
        Type AdvisorToolResultError
        
        const AdvisorToolResultErrorAdvisorToolResultError AdvisorToolResultError = "advisor_tool_result_error"
      - type BetaAdvisorResultBlock struct{…}
        
        Text string
        
        Type AdvisorResult
        
        const AdvisorResultAdvisorResult AdvisorResult = "advisor_result"
      - type BetaAdvisorRedactedResultBlock struct{…}
        
        EncryptedContent string
        
        Opaque blob containing the advisor’s output. Round-trip verbatim; do not inspect or modify.
        
        Type AdvisorRedactedResult
        
        const AdvisorRedactedResultAdvisorRedactedResult AdvisorRedactedResult = "advisor_redacted_result"
    - ToolUseID string
    - Type AdvisorToolResult
      - const AdvisorToolResultAdvisorToolResult AdvisorToolResult = "advisor_tool_result"
  - type BetaCodeExecutionToolResultBlock struct{…}
    - Content BetaCodeExecutionToolResultBlockContentUnion
      
      Code execution result with encrypted stdout for PFC + web_search results.
      - type BetaCodeExecutionToolResultError struct{…}
        
        ErrorCode BetaCodeExecutionToolResultErrorCode
        
        const BetaCodeExecutionToolResultErrorCodeInvalidToolInput BetaCodeExecutionToolResultErrorCode = "invalid_tool_input"
        
        const BetaCodeExecutionToolResultErrorCodeUnavailable BetaCodeExecutionToolResultErrorCode = "unavailable"
        
        const BetaCodeExecutionToolResultErrorCodeTooManyRequests BetaCodeExecutionToolResultErrorCode = "too_many_requests"
        
        const BetaCodeExecutionToolResultErrorCodeExecutionTimeExceeded BetaCodeExecutionToolResultErrorCode = "execution_time_exceeded"
        
        Type CodeExecutionToolResultError
        
        const CodeExecutionToolResultErrorCodeExecutionToolResultError CodeExecutionToolResultError = "code_execution_tool_result_error"
      - type BetaCodeExecutionResultBlock struct{…}
        
        Content []BetaCodeExecutionOutputBlock
        
        FileID string
        
        Type CodeExecutionOutput
        
        const CodeExecutionOutputCodeExecutionOutput CodeExecutionOutput = "code_execution_output"
        
        ReturnCode int64
        
        Stderr string
        
        Stdout string
        
        Type CodeExecutionResult
        
        const CodeExecutionResultCodeExecutionResult CodeExecutionResult = "code_execution_result"
      - type BetaEncryptedCodeExecutionResultBlock struct{…}
        
        Code execution result with encrypted stdout for PFC + web_search results.
        
        Content []BetaCodeExecutionOutputBlock
        
        FileID string
        
        Type CodeExecutionOutput
        
        const CodeExecutionOutputCodeExecutionOutput CodeExecutionOutput = "code_execution_output"
        
        EncryptedStdout string
        
        ReturnCode int64
        
        Stderr string
        
        Type EncryptedCodeExecutionResult
        
        const EncryptedCodeExecutionResultEncryptedCodeExecutionResult EncryptedCodeExecutionResult = "encrypted_code_execution_result"
    - ToolUseID string
    - Type CodeExecutionToolResult
      - const CodeExecutionToolResultCodeExecutionToolResult CodeExecutionToolResult = "code_execution_tool_result"
  - type BetaBashCodeExecutionToolResultBlock struct{…}
    - Content BetaBashCodeExecutionToolResultBlockContentUnion
      - type BetaBashCodeExecutionToolResultError struct{…}
        
        ErrorCode BetaBashCodeExecutionToolResultErrorErrorCode
        
        const BetaBashCodeExecutionToolResultErrorErrorCodeInvalidToolInput BetaBashCodeExecutionToolResultErrorErrorCode = "invalid_tool_input"
        
        const BetaBashCodeExecutionToolResultErrorErrorCodeUnavailable BetaBashCodeExecutionToolResultErrorErrorCode = "unavailable"
        
        const BetaBashCodeExecutionToolResultErrorErrorCodeTooManyRequests BetaBashCodeExecutionToolResultErrorErrorCode = "too_many_requests"
        
        const BetaBashCodeExecutionToolResultErrorErrorCodeExecutionTimeExceeded BetaBashCodeExecutionToolResultErrorErrorCode = "execution_time_exceeded"
        
        const BetaBashCodeExecutionToolResultErrorErrorCodeOutputFileTooLarge BetaBashCodeExecutionToolResultErrorErrorCode = "output_file_too_large"
        
        Type BashCodeExecutionToolResultError
        
        const BashCodeExecutionToolResultErrorBashCodeExecutionToolResultError BashCodeExecutionToolResultError = "bash_code_execution_tool_result_error"
      - type BetaBashCodeExecutionResultBlock struct{…}
        
        Content []BetaBashCodeExecutionOutputBlock
        
        FileID string
        
        Type BashCodeExecutionOutput
        
        const BashCodeExecutionOutputBashCodeExecutionOutput BashCodeExecutionOutput = "bash_code_execution_output"
        
        ReturnCode int64
        
        Stderr string
        
        Stdout string
        
        Type BashCodeExecutionResult
        
        const BashCodeExecutionResultBashCodeExecutionResult BashCodeExecutionResult = "bash_code_execution_result"
    - ToolUseID string
    - Type BashCodeExecutionToolResult
      - const BashCodeExecutionToolResultBashCodeExecutionToolResult BashCodeExecutionToolResult = "bash_code_execution_tool_result"
  - type BetaTextEditorCodeExecutionToolResultBlock struct{…}
    - Content BetaTextEditorCodeExecutionToolResultBlockContentUnion
      - type BetaTextEditorCodeExecutionToolResultError struct{…}
        
        ErrorCode BetaTextEditorCodeExecutionToolResultErrorErrorCode
        
        const BetaTextEditorCodeExecutionToolResultErrorErrorCodeInvalidToolInput BetaTextEditorCodeExecutionToolResultErrorErrorCode = "invalid_tool_input"
        
        const BetaTextEditorCodeExecutionToolResultErrorErrorCodeUnavailable BetaTextEditorCodeExecutionToolResultErrorErrorCode = "unavailable"
        
        const BetaTextEditorCodeExecutionToolResultErrorErrorCodeTooManyRequests BetaTextEditorCodeExecutionToolResultErrorErrorCode = "too_many_requests"
        
        const BetaTextEditorCodeExecutionToolResultErrorErrorCodeExecutionTimeExceeded BetaTextEditorCodeExecutionToolResultErrorErrorCode = "execution_time_exceeded"
        
        const BetaTextEditorCodeExecutionToolResultErrorErrorCodeFileNotFound BetaTextEditorCodeExecutionToolResultErrorErrorCode = "file_not_found"
        
        ErrorMessage string
        
        Type TextEditorCodeExecutionToolResultError
        
        const TextEditorCodeExecutionToolResultErrorTextEditorCodeExecutionToolResultError TextEditorCodeExecutionToolResultError = "text_editor_code_execution_tool_result_error"
      - type BetaTextEditorCodeExecutionViewResultBlock struct{…}
        
        Content string
        
        FileType BetaTextEditorCodeExecutionViewResultBlockFileType
        
        const BetaTextEditorCodeExecutionViewResultBlockFileTypeText BetaTextEditorCodeExecutionViewResultBlockFileType = "text"
        
        const BetaTextEditorCodeExecutionViewResultBlockFileTypeImage BetaTextEditorCodeExecutionViewResultBlockFileType = "image"
        
        const BetaTextEditorCodeExecutionViewResultBlockFileTypePDF BetaTextEditorCodeExecutionViewResultBlockFileType = "pdf"
        
        NumLines int64
        
        StartLine int64
        
        TotalLines int64
        
        Type TextEditorCodeExecutionViewResult
        
        const TextEditorCodeExecutionViewResultTextEditorCodeExecutionViewResult TextEditorCodeExecutionViewResult = "text_editor_code_execution_view_result"
      - type BetaTextEditorCodeExecutionCreateResultBlock struct{…}
        
        IsFileUpdate bool
        
        Type TextEditorCodeExecutionCreateResult
        
        const TextEditorCodeExecutionCreateResultTextEditorCodeExecutionCreateResult TextEditorCodeExecutionCreateResult = "text_editor_code_execution_create_result"
      - type BetaTextEditorCodeExecutionStrReplaceResultBlock struct{…}
        
        Lines []string
        
        NewLines int64
        
        NewStart int64
        
        OldLines int64
        
        OldStart int64
        
        Type TextEditorCodeExecutionStrReplaceResult
        
        const TextEditorCodeExecutionStrReplaceResultTextEditorCodeExecutionStrReplaceResult TextEditorCodeExecutionStrReplaceResult = "text_editor_code_execution_str_replace_result"
    - ToolUseID string
    - Type TextEditorCodeExecutionToolResult
      - const TextEditorCodeExecutionToolResultTextEditorCodeExecutionToolResult TextEditorCodeExecutionToolResult = "text_editor_code_execution_tool_result"
  - type BetaToolSearchToolResultBlock struct{…}
    - Content BetaToolSearchToolResultBlockContentUnion
      - type BetaToolSearchToolResultError struct{…}
        
        ErrorCode BetaToolSearchToolResultErrorErrorCode
        
        const BetaToolSearchToolResultErrorErrorCodeInvalidToolInput BetaToolSearchToolResultErrorErrorCode = "invalid_tool_input"
        
        const BetaToolSearchToolResultErrorErrorCodeUnavailable BetaToolSearchToolResultErrorErrorCode = "unavailable"
        
        const BetaToolSearchToolResultErrorErrorCodeTooManyRequests BetaToolSearchToolResultErrorErrorCode = "too_many_requests"
        
        const BetaToolSearchToolResultErrorErrorCodeExecutionTimeExceeded BetaToolSearchToolResultErrorErrorCode = "execution_time_exceeded"
        
        ErrorMessage string
        
        Type ToolSearchToolResultError
        
        const ToolSearchToolResultErrorToolSearchToolResultError ToolSearchToolResultError = "tool_search_tool_result_error"
      - type BetaToolSearchToolSearchResultBlock struct{…}
        
        ToolReferences []BetaToolReferenceBlock
        
        ToolName string
        
        Type ToolReference
        
        const ToolReferenceToolReference ToolReference = "tool_reference"
        
        Type ToolSearchToolSearchResult
        
        const ToolSearchToolSearchResultToolSearchToolSearchResult ToolSearchToolSearchResult = "tool_search_tool_search_result"
    - ToolUseID string
    - Type ToolSearchToolResult
      - const ToolSearchToolResultToolSearchToolResult ToolSearchToolResult = "tool_search_tool_result"
  - type BetaMCPToolUseBlock struct{…}
    - ID string
    - Input map[string, any]
    - Name string
      
      The name of the MCP tool
    - ServerName string
      
      The name of the MCP server
    - Type MCPToolUse
      - const MCPToolUseMCPToolUse MCPToolUse = "mcp_tool_use"
  - type BetaMCPToolResultBlock struct{…}
    - Content BetaMCPToolResultBlockContentUnion
      - string
      - type BetaMCPToolResultBlockContentBetaMCPToolResultBlockContent []BetaTextBlock
        
        Citations []BetaTextCitationUnion
        
        Citations supporting the text block.
        
        The type of citation returned will depend on the type of document being cited. Citing a PDF results in page_location, plain text results in char_location, and content document results in content_block_location.
        
        type BetaCitationCharLocation struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndCharIndex int64
        
        FileID string
        
        StartCharIndex int64
        
        Type CharLocation
        
        const CharLocationCharLocation CharLocation = "char_location"
        
        type BetaCitationPageLocation struct{…}
        
        CitedText string
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndPageNumber int64
        
        FileID string
        
        StartPageNumber int64
        
        Type PageLocation
        
        const PageLocationPageLocation PageLocation = "page_location"
        
        type BetaCitationContentBlockLocation struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        DocumentIndex int64
        
        DocumentTitle string
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        FileID string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Type ContentBlockLocation
        
        const ContentBlockLocationContentBlockLocation ContentBlockLocation = "content_block_location"
        
        type BetaCitationsWebSearchResultLocation struct{…}
        
        CitedText string
        
        EncryptedIndex string
        
        Title string
        
        Type WebSearchResultLocation
        
        const WebSearchResultLocationWebSearchResultLocation WebSearchResultLocation = "web_search_result_location"
        
        URL string
        
        type BetaCitationSearchResultLocation struct{…}
        
        CitedText string
        
        The full text of the cited block range, concatenated.
        
        Always equals the contents of content[start_block_index:end_block_index] joined together. The text block is the minimal citable unit; this field is never a substring of a single block. Not counted toward output tokens, and not counted toward input tokens when sent back in subsequent turns.
        
        EndBlockIndex int64
        
        Exclusive 0-based end index of the cited block range in the source’s content array.
        
        Always greater than start_block_index; a single-block citation has end_block_index = start_block_index + 1.
        
        SearchResultIndex int64
        
        0-based index of the cited search result among all search_result content blocks in the request, in the order they appear across messages and tool results.
        
        Counted separately from document_index; server-side web search results are not included in this count.
        
        Source string
        
        StartBlockIndex int64
        
        0-based index of the first cited block in the source’s content array.
        
        Title string
        
        Type SearchResultLocation
        
        const SearchResultLocationSearchResultLocation SearchResultLocation = "search_result_location"
        
        Text string
        
        Type Text
        
        const TextText Text = "text"
    - IsError bool
    - ToolUseID string
    - Type MCPToolResult
      - const MCPToolResultMCPToolResult MCPToolResult = "mcp_tool_result"
  - type BetaContainerUploadBlock struct{…}
    
    Response model for a file uploaded to the container.
    - FileID string
    - Type ContainerUpload
      - const ContainerUploadContainerUpload ContainerUpload = "container_upload"
  - type BetaCompactionBlock struct{…}
    
    A compaction block returned when autocompact is triggered.
    
    When content is None, it indicates the compaction failed to produce a valid summary (e.g., malformed output from the model). Clients may round-trip compaction blocks with null content; the server treats them as no-ops.
    - Content string
      
      Summary of compacted content, or null if compaction failed
    - EncryptedContent string
      
      Opaque metadata from prior compaction, to be round-tripped verbatim
    - Type Compaction
      - const CompactionCompaction Compaction = "compaction"
- ContextManagement BetaContextManagementResponse
  
  Context management response.
  
  Information about context management strategies applied during the request.
  - AppliedEdits []BetaContextManagementResponseAppliedEditUnion
    
    List of context management edits that were applied.
    - type BetaClearToolUses20250919EditResponse struct{…}
      - ClearedInputTokens int64
        
        Number of input tokens cleared by this edit.
      - ClearedToolUses int64
        
        Number of tool uses that were cleared.
      - Type ClearToolUses20250919
        
        The type of context management edit applied.
        
        const ClearToolUses20250919ClearToolUses20250919 ClearToolUses20250919 = "clear_tool_uses_20250919"
    - type BetaClearThinking20251015EditResponse struct{…}
      - ClearedInputTokens int64
        
        Number of input tokens cleared by this edit.
      - ClearedThinkingTurns int64
        
        Number of thinking turns that were cleared.
      - Type ClearThinking20251015
        
        The type of context management edit applied.
        
        const ClearThinking20251015ClearThinking20251015 ClearThinking20251015 = "clear_thinking_20251015"
- Model Model
  
  The model that will complete your prompt.
  
  See models for additional details and options.
  - type Model string
    
    The model that will complete your prompt.
    
    See models for additional details and options.
    - const ModelClaudeOpus4_7 Model = "claude-opus-4-7"
      
      Frontier intelligence for long-running agents and coding
    - const ModelClaudeMythosPreview Model = "claude-mythos-preview"
      
      New class of intelligence, strongest in coding and cybersecurity
    - const ModelClaudeOpus4_6 Model = "claude-opus-4-6"
      
      Frontier intelligence for long-running agents and coding
    - const ModelClaudeSonnet4_6 Model = "claude-sonnet-4-6"
      
      Best combination of speed and intelligence
    - const ModelClaudeHaiku4_5 Model = "claude-haiku-4-5"
      
      Fastest model with near-frontier intelligence
    - const ModelClaudeHaiku4_5_20251001 Model = "claude-haiku-4-5-20251001"
      
      Fastest model with near-frontier intelligence
    - const ModelClaudeOpus4_5 Model = "claude-opus-4-5"
      
      Premium model combining maximum intelligence with practical performance
    - const ModelClaudeOpus4_5_20251101 Model = "claude-opus-4-5-20251101"
      
      Premium model combining maximum intelligence with practical performance
    - const ModelClaudeSonnet4_5 Model = "claude-sonnet-4-5"
      
      High-performance model for agents and coding
    - const ModelClaudeSonnet4_5_20250929 Model = "claude-sonnet-4-5-20250929"
      
      High-performance model for agents and coding
    - const ModelClaudeOpus4_1 Model = "claude-opus-4-1"
      
      Exceptional model for specialized complex tasks
    - const ModelClaudeOpus4_1_20250805 Model = "claude-opus-4-1-20250805"
      
      Exceptional model for specialized complex tasks
    - const ModelClaudeOpus4_0 Model = "claude-opus-4-0"
      
      Powerful model for complex tasks
    - const ModelClaudeOpus4_20250514 Model = "claude-opus-4-20250514"
      
      Powerful model for complex tasks
    - const ModelClaudeSonnet4_0 Model = "claude-sonnet-4-0"
      
      High-performance model with extended thinking
    - const ModelClaudeSonnet4_20250514 Model = "claude-sonnet-4-20250514"
      
      High-performance model with extended thinking
    - const ModelClaude_3_Haiku_20240307 Model = "claude-3-haiku-20240307"
      
      Fast and cost-effective model
  - string
- Role Assistant
  
  Conversational role of the generated message.
  
  This will always be "assistant".
  - const AssistantAssistant Assistant = "assistant"
- StopDetails BetaRefusalStopDetails
  
  Structured information about a refusal.
  - Category BetaRefusalStopDetailsCategory
    
    The policy category that triggered the refusal.
    
    null when the refusal doesn’t map to a named category.
    - const BetaRefusalStopDetailsCategoryCyber BetaRefusalStopDetailsCategory = "cyber"
    - const BetaRefusalStopDetailsCategoryBio BetaRefusalStopDetailsCategory = "bio"
  - Explanation string
    
    Human-readable explanation of the refusal.
    
    This text is not guaranteed to be stable. null when no explanation is available for the category.
  - Type Refusal
    - const RefusalRefusal Refusal = "refusal"
- StopReason BetaStopReason
  
  The reason that we stopped.
  
  This may be one the following values:
  - "end_turn": the model reached a natural stopping point
  - "max_tokens": we exceeded the requested max_tokens or the model’s maximum
  - "stop_sequence": one of your provided custom stop_sequences was generated
  - "tool_use": the model invoked one or more tools
  - "pause_turn": we paused a long-running turn. You may provide the response back as-is in a subsequent request to let the model continue.
  - "refusal": when streaming classifiers intervene to handle potential policy violations
  In non-streaming mode this value is always non-null. In streaming mode, it is null in the message_start event and non-null otherwise.
  - const BetaStopReasonEndTurn BetaStopReason = "end_turn"
  - const BetaStopReasonMaxTokens BetaStopReason = "max_tokens"
  - const BetaStopReasonStopSequence BetaStopReason = "stop_sequence"
  - const BetaStopReasonToolUse BetaStopReason = "tool_use"
  - const BetaStopReasonPauseTurn BetaStopReason = "pause_turn"
  - const BetaStopReasonCompaction BetaStopReason = "compaction"
  - const BetaStopReasonRefusal BetaStopReason = "refusal"
  - const BetaStopReasonModelContextWindowExceeded BetaStopReason = "model_context_window_exceeded"
- StopSequence string
  
  Which custom stop sequence was generated, if any.
  
  This value will be a non-null string if one of your custom stop sequences was generated.
- Type Message
  
  Object type.
  
  For Messages, this is always "message".
  - const MessageMessage Message = "message"
- Usage BetaUsage
  
  Billing and rate-limit usage.
  
  Anthropic’s API bills and rate-limits by token counts, as tokens represent the underlying cost to our systems.
  
  Under the hood, the API transforms requests into a format suitable for the model. The model’s output then goes through a parsing stage before becoming an API response. As a result, the token counts in usage will not match one-to-one with the exact visible content of an API request or response.
  
  For example, output_tokens will be non-zero, even for an empty string response from Claude.
  
  Total input tokens in a request is the summation of input_tokens, cache_creation_input_tokens, and cache_read_input_tokens.
  - CacheCreation BetaCacheCreation
    
    Breakdown of cached tokens by TTL
    - Ephemeral1hInputTokens int64
      
      The number of input tokens used to create the 1 hour cache entry.
    - Ephemeral5mInputTokens int64
      
      The number of input tokens used to create the 5 minute cache entry.
  - CacheCreationInputTokens int64
    
    The number of input tokens used to create the cache entry.
  - CacheReadInputTokens int64
    
    The number of input tokens read from the cache.
  - InferenceGeo string
    
    The geographic region where inference was performed for this request.
  - InputTokens int64
    
    The number of input tokens which were used.
  - Iterations BetaIterationsUsage
    
    Per-iteration token usage breakdown.
    
    Each entry represents one sampling iteration, with its own input/output token counts and cache statistics. This allows you to:
    - Determine which iterations exceeded long context thresholds (>=200k tokens)
    - Calculate the true context window size from the last iteration
    - Understand token accumulation across server-side tool use loops
    - type BetaMessageIterationUsage struct{…}
      
      Token usage for a sampling iteration.
      - CacheCreation BetaCacheCreation
        
        Breakdown of cached tokens by TTL
        
        Ephemeral1hInputTokens int64
        
        The number of input tokens used to create the 1 hour cache entry.
        
        Ephemeral5mInputTokens int64
        
        The number of input tokens used to create the 5 minute cache entry.
      - CacheCreationInputTokens int64
        
        The number of input tokens used to create the cache entry.
      - CacheReadInputTokens int64
        
        The number of input tokens read from the cache.
      - InputTokens int64
        
        The number of input tokens which were used.
      - OutputTokens int64
        
        The number of output tokens which were used.
      - Type Message
        
        Usage for a sampling iteration
        
        const MessageMessage Message = "message"
    - type BetaCompactionIterationUsage struct{…}
      
      Token usage for a compaction iteration.
      - CacheCreation BetaCacheCreation
        
        Breakdown of cached tokens by TTL
        
        Ephemeral1hInputTokens int64
        
        The number of input tokens used to create the 1 hour cache entry.
        
        Ephemeral5mInputTokens int64
        
        The number of input tokens used to create the 5 minute cache entry.
      - CacheCreationInputTokens int64
        
        The number of input tokens used to create the cache entry.
      - CacheReadInputTokens int64
        
        The number of input tokens read from the cache.
      - InputTokens int64
        
        The number of input tokens which were used.
      - OutputTokens int64
        
        The number of output tokens which were used.
      - Type Compaction
        
        Usage for a compaction iteration
        
        const CompactionCompaction Compaction = "compaction"
    - type BetaAdvisorMessageIterationUsage struct{…}
      
      Token usage for an advisor sub-inference iteration.
      - CacheCreation BetaCacheCreation
        
        Breakdown of cached tokens by TTL
        
        Ephemeral1hInputTokens int64
        
        The number of input tokens used to create the 1 hour cache entry.
        
        Ephemeral5mInputTokens int64
        
        The number of input tokens used to create the 5 minute cache entry.
      - CacheCreationInputTokens int64
        
        The number of input tokens used to create the cache entry.
      - CacheReadInputTokens int64
        
        The number of input tokens read from the cache.
      - InputTokens int64
        
        The number of input tokens which were used.
      - Model Model
        
        The model that will complete your prompt.
        
        See models for additional details and options.
        
        type Model string
        
        The model that will complete your prompt.
        
        See models for additional details and options.
        
        const ModelClaudeOpus4_7 Model = "claude-opus-4-7"
        
        Frontier intelligence for long-running agents and coding
        
        const ModelClaudeMythosPreview Model = "claude-mythos-preview"
        
        New class of intelligence, strongest in coding and cybersecurity
        
        const ModelClaudeOpus4_6 Model = "claude-opus-4-6"
        
        Frontier intelligence for long-running agents and coding
        
        const ModelClaudeSonnet4_6 Model = "claude-sonnet-4-6"
        
        Best combination of speed and intelligence
        
        const ModelClaudeHaiku4_5 Model = "claude-haiku-4-5"
        
        Fastest model with near-frontier intelligence
        
        const ModelClaudeHaiku4_5_20251001 Model = "claude-haiku-4-5-20251001"
        
        Fastest model with near-frontier intelligence
        
        const ModelClaudeOpus4_5 Model = "claude-opus-4-5"
        
        Premium model combining maximum intelligence with practical performance
        
        const ModelClaudeOpus4_5_20251101 Model = "claude-opus-4-5-20251101"
        
        Premium model combining maximum intelligence with practical performance
        
        const ModelClaudeSonnet4_5 Model = "claude-sonnet-4-5"
        
        High-performance model for agents and coding
        
        const ModelClaudeSonnet4_5_20250929 Model = "claude-sonnet-4-5-20250929"
        
        High-performance model for agents and coding
        
        const ModelClaudeOpus4_1 Model = "claude-opus-4-1"
        
        Exceptional model for specialized complex tasks
        
        const ModelClaudeOpus4_1_20250805 Model = "claude-opus-4-1-20250805"
        
        Exceptional model for specialized complex tasks
        
        const ModelClaudeOpus4_0 Model = "claude-opus-4-0"
        
        Powerful model for complex tasks
        
        const ModelClaudeOpus4_20250514 Model = "claude-opus-4-20250514"
        
        Powerful model for complex tasks
        
        const ModelClaudeSonnet4_0 Model = "claude-sonnet-4-0"
        
        High-performance model with extended thinking
        
        const ModelClaudeSonnet4_20250514 Model = "claude-sonnet-4-20250514"
        
        High-performance model with extended thinking
        
        const ModelClaude_3_Haiku_20240307 Model = "claude-3-haiku-20240307"
        
        Fast and cost-effective model
        
        string
      - OutputTokens int64
        
        The number of output tokens which were used.
      - Type AdvisorMessage
        
        Usage for an advisor sub-inference iteration
        
        const AdvisorMessageAdvisorMessage AdvisorMessage = "advisor_message"
  - OutputTokens int64
    
    The number of output tokens which were used.
  - ServerToolUse BetaServerToolUsage
    
    The number of server tool requests.
    - WebFetchRequests int64
      
      The number of web fetch tool requests.
    - WebSearchRequests int64
      
      The number of web search tool requests.
  - ServiceTier BetaUsageServiceTier
    
    If the request used the priority, standard, or batch tier.
    - const BetaUsageServiceTierStandard BetaUsageServiceTier = "standard"
    - const BetaUsageServiceTierPriority BetaUsageServiceTier = "priority"
    - const BetaUsageServiceTierBatch BetaUsageServiceTier = "batch"
  - Speed BetaUsageSpeed
    
    The inference speed mode used for this request.
    - const BetaUsageSpeedStandard BetaUsageSpeed = "standard"
    - const BetaUsageSpeedFast BetaUsageSpeed = "fast"

Example

package main
 
import (
  "context"
  "fmt"
 
  "github.com/anthropics/anthropic-sdk-go"
  "github.com/anthropics/anthropic-sdk-go/option"
)
 
func main() {
  client := anthropic.NewClient(
    option.WithAPIKey("my-anthropic-api-key"),
  )
  betaMessage, err := client.Beta.Messages.New(context.TODO(), anthropic.BetaMessageNewParams{
    MaxTokens: 1024,
    Messages: []anthropic.BetaMessageParam{anthropic.BetaMessageParam{
      Content: []anthropic.BetaContentBlockParamUnion{anthropic.BetaContentBlockParamUnion{
        OfText: &anthropic.BetaTextBlockParam{
          Text: "x",
        },
      }},
      Role: anthropic.BetaMessageParamRoleUser,
    }},
    Model: anthropic.ModelClaudeOpus4_6,
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", betaMessage.ID)
}

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Nền tảng: Anthropic
Nguồn: https://platform.claude.com/docs/en/api/go/beta/messages/create.md

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KakaFlow KB

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Create Message - Beta Messages API (Go)

Create Message - Beta Messages API (Go)

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Nội dung gốc (Original)

Create

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Example

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