#Create a Message

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

#Headers

• "juglow-user-profile-id": optional string

The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization. Requires the user-profiles beta header.

• "juglow-workspace-id": optional string

Optional header to select the Workspace for this request. The value is a Workspace ID (for example, wrkspc_011CZkZaBF1tNoB5wlCeusgy).

Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.

#Body parameters

• max_tokens: number

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.

minimum: 0

• messages: array of MessageParam

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, Haijun"}]

Example with multiple conversational turns:

  [
    {"role": "user", "content": "Hello there."},
    {"role": "assistant", "content": "Hi, I'm Haijun. How can I help you?"},
    {"role": "user", "content": "Can you explain LLMs in plain English?"},
  ]

Example with a partially-filled response from Haijun:

  [
    {"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, Haijun"}

  {"role": "user", "content": [{"type": "text", "text": "Hello, Haijun"}]}

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: string or array of ContentBlockParam

• string

• array of ContentBlockParam

• TextBlockParam object

• type: "text"

• text: string

minLength: 1

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• type: "ephemeral"

• ttl: optional "5m" or "1h"

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. See prompt caching pricing for details.

• "5m"

• "1h"

• citations: optional array of TextCitationParam or null

• CitationCharLocationParam object

• type: "char_location"

• cited_text: string

• document_index: number

minimum: 0

• document_title: string or null

minLength: 1, maxLength: 500

• end_char_index: number

• start_char_index: number

minimum: 0

• CitationPageLocationParam object

• type: "page_location"

• cited_text: string

• document_index: number

minimum: 0

• document_title: string or null

minLength: 1, maxLength: 500

• end_page_number: number

• start_page_number: number

minimum: 1

• CitationContentBlockLocationParam object

• type: "content_block_location"

• cited_text: 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.

• document_index: number

minimum: 0

• document_title: string or null

minLength: 1, maxLength: 500

• end_block_index: number

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.

• start_block_index: number

0-based index of the first cited block in the source's content array.

minimum: 0

• CitationWebSearchResultLocationParam object

• type: "web_search_result_location"

• cited_text: string

• encrypted_index: string

• title: string or null

minLength: 1, maxLength: 512

• url: string

minLength: 1

• CitationSearchResultLocationParam object

• type: "search_result_location"

• cited_text: 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.

• end_block_index: number

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.

• search_result_index: number

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.

minimum: 0

• source: string

• start_block_index: number

0-based index of the first cited block in the source's content array.

minimum: 0

• title: string or null

• ImageBlockParam object

• type: "image"

• source: Base64ImageSource or URLImageSource or FileImageSource

• Base64ImageSource object

• type: "base64"

• data: string

format: byte

• media_type: "image/jpeg" or "image/png" or "image/gif" or "image/webp"

• "image/jpeg"

• "image/png"

• "image/gif"

• "image/webp"

• URLImageSource object

• type: "url"

• url: string

• FileImageSource object

• type: "file"

• file_id: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• transformations: optional ImageTransformationsParam or null

Configures the transformations the server applies to this image before the model observes it. Each key names a condition the server transforms images for; its value selects the transformation applied. Omitted keys keep their default behavior, and an empty object is equivalent to omitting the field.

• oversized_image: optional "downsize" or "error"

What the server does when this image exceeds the model's maximum image size. "downsize" (the default) scales the image down to fit, which changes the dimensions the model observes without telling you. "error" instead rejects the request with a 400 error naming the image's dimensions and the largest dimensions that fit, so you can scale the image deliberately — your image is never silently scaled down.

• "downsize"

• "error"

• DocumentBlockParam object

• type: "document"

• source: Base64PDFSource or PlainTextSource or ContentBlockSource or 2 more

• Base64PDFSource object

• type: "base64"

• data: string

format: byte

• media_type: "application/pdf"

• PlainTextSource object

• type: "text"

• data: string

• media_type: "text/plain"

• ContentBlockSource object

• type: "content"

• content: string or array of ContentBlockSourceContent

• string

• ContentBlockSourceContent = array of ContentBlockSourceContent

• TextBlockParam object

• ImageBlockParam object

• URLPDFSource object

• type: "url"

• url: string

• FileDocumentSource object

• type: "file"

• file_id: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam or null

• enabled: optional boolean

• context: optional string or null

minLength: 1

• title: optional string or null

minLength: 1, maxLength: 500

• SearchResultBlockParam object

• type: "search_result"

• content: array of TextBlockParam

• type: "text"

• text: string

minLength: 1

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional array of TextCitationParam or null

• source: string

• title: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam

• ThinkingBlockParam object

• type: "thinking"

• signature: string

The signature value of this thinking block, exactly as returned by the API in a previous response. Used to verify that the block was generated by Haijun.

Thinking blocks must be passed back unmodified and in their original order; a modified block results in a 400 invalid_request_error.

• thinking: string

The thinking text of this block as returned by the API.

• RedactedThinkingBlockParam object

• type: "redacted_thinking"

• data: string

The data value of this redacted thinking block, exactly as returned by the API in a previous response. Opaque and encrypted; pass it back unchanged.

• ToolUseBlockParam object

• type: "tool_use"

• id: string

pattern: ^[a-zA-Z0-9_-]+$

• input: map[unknown]

• name: string

minLength: 1, maxLength: 200

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• type: "direct"

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• type: "code_execution_20250825"

• tool_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• ServerToolCaller20260120 object

• type: "code_execution_20260120"

• tool_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• toolset_name: optional string or null

For a toolset member tool_use, the toolset family this member belongs to.

minLength: 1, maxLength: 64, pattern: ^[a-zA-Z0-9_-]+$

• ToolResultBlockParam object

• type: "tool_result"

• tool_use_id: string

pattern: ^[a-zA-Z0-9_-]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• content: optional string or array of TextBlockParam or ImageBlockParam or SearchResultBlockParam or 3 more

• string

• array of TextBlockParam or ImageBlockParam or SearchResultBlockParam or 3 more

• TextBlockParam object

• ImageBlockParam object

• SearchResultBlockParam object

• DocumentBlockParam object

• ToolReferenceBlockParam object

Tool reference block that can be included in tool_result content.

• type: "tool_reference"

• tool_name: string

minLength: 1, maxLength: 256, pattern: ^[a-zA-Z0-9_-]{1,256}$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• BrowserStateBlockParam object

The caller's browser state after a browser toolset member call — the full inventory of open tabs, which tab is active, and any side effects (tabs opened, download state changes) the call produced.

At most one per tool_result, only on a non-error result answering a browser toolset member tool_use. The server renders the model-visible text from it; the model never sees the raw fields.

• type: "browser_state"

• tabs: array of BrowserStateTabEntry

All tabs open in the browser after this call — the full inventory, not a delta. May be empty. Whenever non-empty, exactly one entry carries active: true.

maxItems: 100

• tab_id: string

The caller-assigned identifier for this tab, unique within the inventory.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• title: string

The title of the page the tab is showing. May be empty.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The URL of the page the tab is showing. May be empty.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• active: optional boolean

Whether this tab is the active tab after this call. Whenever tabs is non-empty, exactly one entry is marked active: true.

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• state_changes: optional array of BrowserStateChange or null

Tabs opened and download state changes during this call. "Nothing to report" is expressed by omitting the field, never by an empty list.

minItems: 1, maxItems: 200

• BrowserStateChangeTabOpened object

A tab this call's execution opened that remains open at its end — the creation delta of the tabs inventory, not an event log.

Carries only the tab_id; the tab's title and url live on its tabs entry, which must include the same tab_id. A tab opened during a failed call gets no deferred tab_opened; it simply appears in the next result's tabs inventory.

• type: "tab_opened"

• tab_id: string

The tab_id of the opened tab, present in tabs.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• BrowserStateChangeDownloadStarted object

A file download that started during this call.

• type: "download_started"

• download_id: string

The caller-assigned identifier for this download, stable across the state changes reporting it.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The final post-redirect URL the download was served from.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• BrowserStateChangeDownloadCompleted object

A file download that finished during this call, reported with the same download_id as its download_started — or without a prior download_started, when the download finished during the call that started it (at most one state change per download_id per result).

• type: "download_completed"

• download_id: string

The caller-assigned identifier for this download, stable across the state changes reporting it.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The final post-redirect URL the download was served from.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• path: optional string or null

Where the executor saved the file, on the executor's filesystem. Only included when another tool in the same environment can read the file at that path.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• size_bytes: optional number or null

The completed download's size.

minimum: 0

• BrowserStateChangeDownloadFailed object

A file download that failed — or was cancelled — during this call.

• type: "download_failed"

• download_id: string

The caller-assigned identifier for this download, stable across the state changes reporting it.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The final post-redirect URL the download was served from.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• error: optional string or null

The failure or cancellation detail, when known.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• is_error: optional boolean

• toolset_name: optional string or null

For a toolset member tool_result, the toolset family of the paired tool_use.

minLength: 1, maxLength: 64, pattern: ^[a-zA-Z0-9_-]+$

• ServerToolUseBlockParam object

• type: "server_tool_use"

• id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• input: map[unknown]

• name: "web_search" or "web_fetch" or "code_execution" or 4 more

• "web_search"

• "web_fetch"

• "code_execution"

• "bash_code_execution"

• "text_editor_code_execution"

• "tool_search_tool_regex"

• "tool_search_tool_bm25"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• WebSearchToolResultBlockParam object

• type: "web_search_tool_result"

• content: WebSearchToolResultBlockParamContent

• WebSearchToolResultBlockItem = array of WebSearchResultBlockParam

• type: "web_search_result"

• encrypted_content: string

• title: string

• url: string

• page_age: optional string or null

• WebSearchToolRequestError object

• type: "web_search_tool_result_error"

• error_code: WebSearchToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "max_uses_exceeded"

• "too_many_requests"

• "query_too_long"

• "request_too_large"

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• WebFetchToolResultBlockParam object

• type: "web_fetch_tool_result"

• content: WebFetchToolResultErrorBlockParam or WebFetchBlockParam

• WebFetchToolResultErrorBlockParam object

• type: "web_fetch_tool_result_error"

• error_code: WebFetchToolResultErrorCode

• "invalid_tool_input"

• "url_too_long"

• "url_not_allowed"

• "url_not_in_prior_context"

• "url_not_accessible"

• "unsupported_content_type"

• "too_many_requests"

• "max_uses_exceeded"

• "unavailable"

• "content_too_large"

• WebFetchBlockParam object

• type: "web_fetch_result"

• content: DocumentBlockParam

• url: string

Fetched content URL

• retrieved_at: optional string or null

ISO 8601 timestamp when the content was retrieved

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• CodeExecutionToolResultBlockParam object

• type: "code_execution_tool_result"

• content: CodeExecutionToolResultBlockParamContent

• CodeExecutionToolResultErrorParam object

• type: "code_execution_tool_result_error"

• error_code: CodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• CodeExecutionResultBlockParam object

• type: "code_execution_result"

• content: array of CodeExecutionOutputBlockParam

• type: "code_execution_output"

• file_id: string

• return_code: number

• stderr: string

• stdout: string

• EncryptedCodeExecutionResultBlockParam object

Code execution result with encrypted stdout for PFC + web_search results.

• type: "encrypted_code_execution_result"

• content: array of CodeExecutionOutputBlockParam

• type: "code_execution_output"

• file_id: string

• encrypted_stdout: string

• return_code: number

• stderr: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• BashCodeExecutionToolResultBlockParam object

• type: "bash_code_execution_tool_result"

• content: BashCodeExecutionToolResultErrorParam or BashCodeExecutionResultBlockParam

• BashCodeExecutionToolResultErrorParam object

• type: "bash_code_execution_tool_result_error"

• error_code: BashCodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• "output_file_too_large"

• BashCodeExecutionResultBlockParam object

• type: "bash_code_execution_result"

• content: array of BashCodeExecutionOutputBlockParam

• type: "bash_code_execution_output"

• file_id: string

• return_code: number

• stderr: string

• stdout: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• TextEditorCodeExecutionToolResultBlockParam object

• type: "text_editor_code_execution_tool_result"

• content: TextEditorCodeExecutionToolResultErrorParam or TextEditorCodeExecutionViewResultBlockParam or TextEditorCodeExecutionCreateResultBlockParam or TextEditorCodeExecutionStrReplaceResultBlockParam

• TextEditorCodeExecutionToolResultErrorParam object

• type: "text_editor_code_execution_tool_result_error"

• error_code: TextEditorCodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• "file_not_found"

• error_message: optional string or null

• TextEditorCodeExecutionViewResultBlockParam object

• type: "text_editor_code_execution_view_result"

• content: string

• file_type: "text" or "image" or "pdf"

• "text"

• "image"

• "pdf"

• num_lines: optional number or null

• start_line: optional number or null

• total_lines: optional number or null

• TextEditorCodeExecutionCreateResultBlockParam object

• type: "text_editor_code_execution_create_result"

• is_file_update: boolean

• TextEditorCodeExecutionStrReplaceResultBlockParam object

• type: "text_editor_code_execution_str_replace_result"

• lines: optional array of string or null

• new_lines: optional number or null

• new_start: optional number or null

• old_lines: optional number or null

• old_start: optional number or null

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• ToolSearchToolResultBlockParam object

• type: "tool_search_tool_result"

• content: ToolSearchToolResultErrorParam or ToolSearchToolSearchResultBlockParam

• ToolSearchToolResultErrorParam object

• type: "tool_search_tool_result_error"

• error_code: ToolSearchToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• error_message: optional string or null

• ToolSearchToolSearchResultBlockParam object

• type: "tool_search_tool_search_result"

• tool_references: array of ToolReferenceBlockParam

• type: "tool_reference"

• tool_name: string

minLength: 1, maxLength: 256, pattern: ^[a-zA-Z0-9_-]{1,256}$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• ContainerUploadBlockParam object

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.

• type: "container_upload"

• file_id: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• role: "user" or "assistant" or "system"

• "user"

• "assistant"

• "system"

• model: Model

The model that will complete your prompt.

See models for additional details and options.

• string

• "haijun-fable-5-1" or "haijun-opus-5-5" or "haijun-mythos-5-1" or 15 more

The model that will complete your prompt.

See models for additional details and options.

• "haijun-fable-5-1"

Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows

• "haijun-opus-5-5"

Powerful intelligence for coding, knowledge work, and long-running agents

• "haijun-mythos-5-1"

Our most capable model for cybersecurity and biology research, available through trusted access programs

• "haijun-sonnet-5"

High-performance model for coding and agents

• "haijun-fable-5"

Next generation of intelligence for the hardest knowledge work and coding problems

• "haijun-mythos-5"

Most capable model for cybersecurity and biology research

• "haijun-opus-5"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-8"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-7"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-6"

Powerful intelligence for long-running agents and coding

• "haijun-sonnet-4-6"

Best combination of speed and intelligence

• "haijun-haiku-4-5"

Fastest model with near-frontier intelligence

• "haijun-haiku-4-5-20251001"

Fastest model with near-frontier intelligence

• "haijun-opus-4-5"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-5-20251101"

Powerful intelligence for long-running agents and coding

• "haijun-sonnet-4-5"

High-performance model for agents and coding

• "haijun-sonnet-4-5-20250929"

High-performance model for agents and coding

• "haijun-mythos-preview"

Deprecated: Will reach end-of-life on June 30, 2026. Please migrate to haijun-mythos-5. Visit https://raw.haijun.my.id/docs/ for more information.

New class of intelligence, strongest in coding and cybersecurity

• cache_control: optional CacheControlEphemeral or null

Top-level cache control automatically applies a cache_control marker to the last cacheable block in the request.

• container: optional MessageCreateParamsContainer or null

Container identifier for reuse across requests.

• ContainerParams object

Container parameters with tracks to be loaded.

• id: optional string or null

Container id

• tracks: optional array of SkillParams or null

List of tracks to load in the container

maxItems: 20

• type: "juglow" or "custom"

Type of track - either 'juglow' (built-in) or 'custom' (user-defined)

• "juglow"

• "custom"

• skill_id: string

Track ID

minLength: 1, maxLength: 64

• version: optional string

Track version or 'latest' for most recent version

minLength: 1, maxLength: 64

• string

• diagnostics: optional DiagnosticsParam or null

Request-level diagnostics. Supply previous_message_id to have the response include diagnostics.cache_miss_reason explaining any prompt-cache divergence from that prior request.

• previous_message_id: optional string or null

The id (msg_...) from this client's previous /v1/messages response. The server compares that request's prompt fingerprint against this one and returns diagnostics.cache_miss_reason when the prompt-cache prefix could not be reused. Pass null on the first turn to opt in without a prior message to compare.

maxLength: 256

• inference_geo: optional string or null

Specifies the geographic region for inference processing. If not specified, the workspace's default_inference_geo is used.

• metadata: optional Metadata

An object describing metadata about the request.

• user_id: optional string or null

An external identifier for the user who is associated with the request.

This should be a uuid, hash value, or other opaque identifier. Juglow may use this id to help detect abuse. Do not include any identifying information such as name, email address, or phone number.

maxLength: 512

• output_config: optional OutputConfig

Configuration options for the model's output, such as the output format.

• effort: optional "low" or "medium" or "high" or 2 more or null

How much effort the model should put into its response. Higher effort levels may result in more thorough analysis but take longer.

Valid values are low, medium, high, xhigh, or max.

• "low"

• "medium"

• "high"

• "xhigh"

• "max"

• format: optional JSONOutputFormat or null

A schema to specify Haijun's output format in responses. See structured outputs

• type: "json_schema"

• schema: map[unknown]

The JSON schema of the format

• service_tier: optional "auto" or "standard_only"

Determines whether to use priority capacity (if available) or standard capacity for this request.

Juglow offers different levels of service for your API requests. See service-tiers for details.

• "auto"

• "standard_only"

• stop_sequences: optional array of string

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.

• stream: optional boolean

Whether to incrementally stream the response using server-sent events.

See streaming for details.

• system: optional string or array of TextBlockParam

System prompt.

A system prompt is a way of providing context and instructions to Haijun, such as specifying a particular goal or role. See our guide to system prompts.

• string

• array of TextBlockParam

• type: "text"

• text: string

minLength: 1

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional array of TextCitationParam or null

• thinking: optional ThinkingConfigParam

Configuration for enabling Haijun's extended thinking.

When enabled, responses include thinking content blocks showing Haijun'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.

• ThinkingConfigEnabled object

• type: "enabled"

• budget_tokens: number

Determines how many tokens Haijun can use for its internal reasoning process. Larger budgets can enable more thorough analysis for complex problems, improving response quality.

Must be ≥1024 and less than max_tokens.

See extended thinking for details.

minimum: 1024

• display: optional "summarized" or "omitted" or null

Controls how thinking content appears in the response. When set to summarized, thinking is returned normally. When set to omitted, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to summarized.

• "summarized"

• "omitted"

• ThinkingConfigDisabled object

• type: "disabled"

• ThinkingConfigAdaptive object

• type: "adaptive"

• display: optional "summarized" or "omitted" or null

Controls how thinking content appears in the response. When set to summarized, thinking is returned normally. When set to omitted, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to summarized.

• "summarized"

• "omitted"

• tool_choice: optional ToolChoice

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.

• ToolChoiceAuto object

The model will automatically decide whether to use tools.

• type: "auto"

• disable_parallel_tool_use: optional boolean

Whether to disable parallel tool use.

Defaults to false. If set to true, the model will output at most one tool use.

• ToolChoiceAny object

The model will use any available tools.

• type: "any"

• disable_parallel_tool_use: optional boolean

Whether to disable parallel tool use.

Defaults to false. If set to true, the model will output exactly one tool use.

• ToolChoiceTool object

The model will use the specified tool with tool_choice.name.

• type: "tool"

• name: string

The name of the tool to use.

• disable_parallel_tool_use: optional boolean

Whether to disable parallel tool use.

Defaults to false. If set to true, the model will output exactly one tool use.

• ToolChoiceNone object

The model will not be allowed to use tools.

• type: "none"

• tools: optional array of ToolUnion

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.

• Tool object

• type: optional "custom" or null

• input_schema: object

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"

• properties: optional map[unknown] or null

• required: optional array of string or null

• name: string

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

minLength: 1, maxLength: 128, pattern: ^[a-zA-Z0-9_-]{1,128}$

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• description: optional 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.

• eager_input_streaming: optional boolean or null

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.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolBash20250124 object

• type: "bash_20250124"

• name: "bash"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20250522 object

• type: "code_execution_20250522"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20250825 object

• type: "code_execution_20250825"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20260120 object

Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint).

• type: "code_execution_20260120"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20260521 object

Code execution tool with REPL state persistence.

• type: "code_execution_20260521"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• BrowserToolset20260801 object

The browser toolset: a single tools[] entry (carrying no name) that declares the browser tool family. The model is served the family's tool with any members disabled via configs removed from its schema.

• type: "browser_toolset_20260801"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• configs: optional BrowserToolsetConfigs or null

Sparse per-member overrides, keyed by member name. Absent, null, and {} are equivalent; a member's defaults apply wherever its key is absent.

• type: optional BrowserTypeConfig or null

type's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• close_tab: optional BrowserCloseTabConfig or null

close_tab's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• double_click: optional BrowserDoubleClickConfig or null

double_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• file_upload: optional BrowserFileUploadConfig or null

file_upload's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• find: optional BrowserFindConfig or null

find's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• form_input: optional BrowserFormInputConfig or null

form_input's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• get_page_text: optional BrowserGetPageTextConfig or null

get_page_text's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• hold_key: optional BrowserHoldKeyConfig or null

hold_key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• hover: optional BrowserHoverConfig or null

hover's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• javascript_exec: optional BrowserJavascriptExecConfig or null

javascript_exec's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• key: optional BrowserKeyConfig or null

key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click: optional BrowserLeftClickConfig or null

left_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click_drag: optional BrowserLeftClickDragConfig or null

left_click_drag's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_down: optional BrowserLeftMouseDownConfig or null

left_mouse_down's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_up: optional BrowserLeftMouseUpConfig or null

left_mouse_up's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• list_tabs: optional BrowserListTabsConfig or null

list_tabs's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• middle_click: optional BrowserMiddleClickConfig or null

middle_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• mouse_move: optional BrowserMouseMoveConfig or null

mouse_move's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• navigate: optional BrowserNavigateConfig or null

navigate's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• new_tab: optional BrowserNewTabConfig or null

new_tab's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• read_console: optional BrowserReadConsoleConfig or null

read_console's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• read_network: optional BrowserReadNetworkConfig or null

read_network's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• read_page: optional BrowserReadPageConfig or null

read_page's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• right_click: optional BrowserRightClickConfig or null

right_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• screenshot: optional BrowserScreenshotConfig or null

screenshot's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• scroll: optional BrowserScrollConfig or null

scroll's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• scroll_to: optional BrowserScrollToConfig or null

scroll_to's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• switch_tab: optional BrowserSwitchTabConfig or null

switch_tab's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• triple_click: optional BrowserTripleClickConfig or null

triple_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• wait: optional BrowserWaitConfig or null

wait's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• zoom: optional BrowserZoomConfig or null

zoom's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• MemoryTool20250818 object

• type: "memory_20250818"

• name: "memory"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ComputerToolset20260801 object

The computer toolset: a single tools[] entry (carrying no name) that declares the computer tool family. The model is served the family's tool with any members disabled via configs removed from its schema. Every member is enabled by default, zoom included. The single-tool options display_number and enable_zoom are not fields of a toolset entry — it carries only type, configs, and cache_control; zoom is controlled via configs.zoom.enabled.

• type: "computer_toolset_20260801"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• configs: optional ComputerToolsetConfigs or null

Sparse per-member overrides, keyed by member name. Absent, null, and {} are equivalent; a member's defaults apply wherever its key is absent.

• type: optional ComputerTypeConfig or null

type's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• cursor_position: optional ComputerCursorPositionConfig or null

cursor_position's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• double_click: optional ComputerDoubleClickConfig or null

double_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• hold_key: optional ComputerHoldKeyConfig or null

hold_key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• key: optional ComputerKeyConfig or null

key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click: optional ComputerLeftClickConfig or null

left_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click_drag: optional ComputerLeftClickDragConfig or null

left_click_drag's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_down: optional ComputerLeftMouseDownConfig or null

left_mouse_down's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_up: optional ComputerLeftMouseUpConfig or null

left_mouse_up's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• middle_click: optional ComputerMiddleClickConfig or null

middle_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• mouse_move: optional ComputerMouseMoveConfig or null

mouse_move's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• right_click: optional ComputerRightClickConfig or null

right_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• screenshot: optional ComputerScreenshotConfig or null

screenshot's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• scroll: optional ComputerScrollConfig or null

scroll's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• triple_click: optional ComputerTripleClickConfig or null

triple_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• wait: optional ComputerWaitConfig or null

wait's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• zoom: optional ComputerZoomConfig or null

zoom's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• ToolTextEditor20250124 object

• type: "text_editor_20250124"

• name: "str_replace_editor"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolTextEditor20250429 object

• type: "text_editor_20250429"

• name: "str_replace_based_edit_tool"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolTextEditor20250728 object

• type: "text_editor_20250728"

• name: "str_replace_based_edit_tool"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• max_characters: optional number or null

Maximum number of characters to display when viewing a file. If not specified, defaults to displaying the full file.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• WebSearchTool20250305 object

• type: "web_search_20250305"

• name: "web_search"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

If provided, only these domains will be included in results. Cannot be used alongside blocked_domains.

• blocked_domains: optional array of string or null

If provided, these domains will never appear in results. Cannot be used alongside allowed_domains.

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• user_location: optional UserLocation or null

Parameters for the user's location. Used to provide more relevant search results.

• type: "approximate"

• city: optional string or null

The city of the user.

minLength: 1, maxLength: 255

• country: optional string or null

The two letter ISO country code of the user.

minLength: 2, maxLength: 2

• region: optional string or null

The region of the user.

minLength: 1, maxLength: 255

• timezone: optional string or null

The IANA timezone of the user.

minLength: 1, maxLength: 255

• WebFetchTool20250910 object

• type: "web_fetch_20250910"

• name: "web_fetch"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

List of domains to allow fetching from

• blocked_domains: optional array of string or null

List of domains to block fetching from

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam or null

Citations configuration for fetched documents. Citations are disabled by default.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_content_tokens: optional number or null

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.

minimum: 1

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• url_sources: optional WebFetchURLSources or null

Which sources contribute to the set of URLs the tool may fetch. Omitted means every source.

• client_tool_results: optional WebFetchURLSourceAll or WebFetchURLSourceNone or WebFetchURLSourceOnly or WebFetchURLSourceExcept

Which client tools' results contribute fetchable URLs: "all", "none", or an only or except list of client tool names from tools[].

• WebFetchURLSourceAll object

The url_sources variant under which a source contributes in full: every result of the tool filter's source, or all user input.

• type: "all"

• WebFetchURLSourceNone object

The url_sources variant under which a source contributes nothing: no result of the tool filter's source, or no user input.

• type: "none"

• WebFetchURLSourceOnly object

The tool filter variant under which only the named tools' results contribute.

• type: "only"

• tools: array of WebFetchURLSourceToolReference

• type: "tool_reference"

• name: string

• WebFetchURLSourceExcept object

The tool filter variant under which every result but the named tools' contributes.

• type: "except"

• tools: array of WebFetchURLSourceToolReference

• type: "tool_reference"

• name: string

• server_tool_results: optional WebFetchURLSourceAll or WebFetchURLSourceNone or WebFetchURLSourceOnly or WebFetchURLSourceExcept

Which server tools' results contribute fetchable URLs: "all", "none", or an only or except list of server tool names from tools[]; only web_search and web_fetch results ever contribute.

• WebFetchURLSourceAll object

The url_sources variant under which a source contributes in full: every result of the tool filter's source, or all user input.

• WebFetchURLSourceNone object

The url_sources variant under which a source contributes nothing: no result of the tool filter's source, or no user input.

• WebFetchURLSourceOnly object

The tool filter variant under which only the named tools' results contribute.

• WebFetchURLSourceExcept object

The tool filter variant under which every result but the named tools' contributes.

• user_input: optional WebFetchURLSourceAll or WebFetchURLSourceNone

Whether URLs in user messages are fetchable: "all" or "none".

• WebFetchURLSourceAll object

The url_sources variant under which a source contributes in full: every result of the tool filter's source, or all user input.

• WebFetchURLSourceNone object

The url_sources variant under which a source contributes nothing: no result of the tool filter's source, or no user input.

• WebSearchTool20260209 object

• type: "web_search_20260209"

• name: "web_search"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

If provided, only these domains will be included in results. Cannot be used alongside blocked_domains.

• blocked_domains: optional array of string or null

If provided, these domains will never appear in results. Cannot be used alongside allowed_domains.

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• user_location: optional UserLocation or null

Parameters for the user's location. Used to provide more relevant search results.

• WebFetchTool20260209 object

• type: "web_fetch_20260209"

• name: "web_fetch"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

List of domains to allow fetching from

• blocked_domains: optional array of string or null

List of domains to block fetching from

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam or null

Citations configuration for fetched documents. Citations are disabled by default.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_content_tokens: optional number or null

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.

minimum: 1

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• url_sources: optional WebFetchURLSources or null

Which sources contribute to the set of URLs the tool may fetch. Omitted means every source.

• WebFetchTool20260309 object

Web fetch tool with use_cache parameter for bypassing cached content.

• type: "web_fetch_20260309"

• name: "web_fetch"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

List of domains to allow fetching from

• blocked_domains: optional array of string or null

List of domains to block fetching from

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam or null

Citations configuration for fetched documents. Citations are disabled by default.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_content_tokens: optional number or null

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.

minimum: 1

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• url_sources: optional WebFetchURLSources or null

Which sources contribute to the set of URLs the tool may fetch. Omitted means every source.

• use_cache: optional boolean

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.

• WebSearchTool20260318 object

• type: "web_search_20260318"

• name: "web_search"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

If provided, only these domains will be included in results. Cannot be used alongside blocked_domains.

• blocked_domains: optional array of string or null

If provided, these domains will never appear in results. Cannot be used alongside allowed_domains.

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• response_inclusion: optional "full" or "excluded"

How this tool's result blocks appear in the API response when the result was consumed by a completed code_execution call in the same turn. 'full' returns the complete content (default). 'excluded' drops the nested server_tool_use and result block pair entirely. Results from direct calls, or from code_execution calls that paused before completing, are always returned in full so they can be sent back on the next turn.

• "full"

• "excluded"

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• user_location: optional UserLocation or null

Parameters for the user's location. Used to provide more relevant search results.

• WebFetchTool20260318 object

• type: "web_fetch_20260318"

• name: "web_fetch"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

List of domains to allow fetching from

• blocked_domains: optional array of string or null

List of domains to block fetching from

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam or null

Citations configuration for fetched documents. Citations are disabled by default.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_content_tokens: optional number or null

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.

minimum: 1

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• response_inclusion: optional "full" or "excluded"

How this tool's result blocks appear in the API response when the result was consumed by a completed code_execution call in the same turn. 'full' returns the complete content (default). 'excluded' drops the nested server_tool_use and result block pair entirely. Results from direct calls, or from code_execution calls that paused before completing, are always returned in full so they can be sent back on the next turn.

• "full"

• "excluded"

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• url_sources: optional WebFetchURLSources or null

Which sources contribute to the set of URLs the tool may fetch. Omitted means every source.

• use_cache: optional boolean

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.

• ToolSearchToolBm25_20251119 object

• type: "tool_search_tool_bm25_20251119" or "tool_search_tool_bm25"

• "tool_search_tool_bm25_20251119"

• "tool_search_tool_bm25"

• name: "tool_search_tool_bm25"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolSearchToolRegex20251119 object

• type: "tool_search_tool_regex_20251119" or "tool_search_tool_regex"

• "tool_search_tool_regex_20251119"

• "tool_search_tool_regex"

• name: "tool_search_tool_regex"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• temperature: optional number

Deprecated: Deprecated. Models released after Haijun Opus 4.6 do not support setting temperature. A value of 1.0 will be accepted for backwards compatibility, all other values will be rejected with a 400 error.

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.

minimum: 0, maximum: 1

• top_k: optional number

Deprecated: Deprecated. Models released after Haijun Opus 4.6 do not accept top_k; any value will be rejected with a 400 error.

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.

minimum: 0

• top_p: optional number

Deprecated: Deprecated. Models released after Haijun Opus 4.6 do not support setting top_p. A value >= 0.99 will be accepted for backwards compatibility, all other values will be rejected with a 400 error.

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.

minimum: 0, maximum: 1

#Returns

• Message object

• type: "message"

Object type.

For Messages, this is always "message".

default: message

• id: string

Unique object identifier.

The format and length of IDs may change over time.

• container: Container or null

Information about the container used in this request.

This will be non-null if a container tool (e.g. code execution) was used.

• id: string

Identifier for the container used in this request

• expires_at: string

The time at which the container will expire.

format: date-time

• tracks: array of ContainerSkill or null

Tracks loaded in the container

• type: "juglow" or "custom"

Type of track - either 'juglow' (built-in) or 'custom' (user-defined)

• "juglow"

• "custom"

• skill_id: string

Track ID

minLength: 1, maxLength: 64

• version: string

The resolved version: a track version ID for custom tracks.

minLength: 1, maxLength: 64

• content: array of ContentBlock

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 Haijun."}]

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)"}]

• TextBlock object

• type: "text"

default: text

• citations: array of TextCitation or null

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.

• CitationCharLocation object

• type: "char_location"

default: char_location

• cited_text: string

• document_index: number

minimum: 0

• document_title: string or null

• end_char_index: number

• file_id: string or null

• start_char_index: number

minimum: 0

• CitationPageLocation object

• type: "page_location"

default: page_location

• cited_text: string

• document_index: number

minimum: 0

• document_title: string or null

• end_page_number: number

• file_id: string or null

• start_page_number: number

minimum: 1

• CitationContentBlockLocation object

• type: "content_block_location"

default: content_block_location

• cited_text: 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.

• document_index: number

minimum: 0

• document_title: string or null

• end_block_index: number

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.

• file_id: string or null

• start_block_index: number

0-based index of the first cited block in the source's content array.

minimum: 0

• CitationsWebSearchResultLocation object

• type: "web_search_result_location"

default: web_search_result_location

• cited_text: string

• encrypted_index: string

• title: string or null

maxLength: 512

• url: string

• CitationsSearchResultLocation object

• type: "search_result_location"

default: search_result_location

• cited_text: 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.

• end_block_index: number

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.

• search_result_index: number

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.

minimum: 0

• source: string

• start_block_index: number

0-based index of the first cited block in the source's content array.

minimum: 0

• title: string or null

• text: string

• ThinkingBlock object

• type: "thinking"

default: thinking

• signature: string

A value used to verify that this thinking block was generated by Haijun when it is passed back to the API.

This is an opaque field and should not be interpreted or parsed. When passing thinking blocks back to the API (required when using tools with extended thinking), pass them back exactly as received, with this field intact.

See extended thinking for details.

• thinking: string

The text of Haijun's thinking process for this block.

• RedactedThinkingBlock object

• type: "redacted_thinking"

default: redacted_thinking

• data: string

The contents of this redacted thinking block, returned when portions of the model's thinking were safety-redacted. This field is opaque and encrypted, with no readable content.

Pass redacted_thinking blocks back to the API unchanged when continuing a multi-turn conversation.

See extended thinking for details.

• ToolUseBlock object

• type: "tool_use"

default: tool_use

• id: string

pattern: ^[a-zA-Z0-9_-]+$

• caller: DirectCaller or ServerToolCaller or ServerToolCaller20260120

default: {"type":"direct"}

• DirectCaller object

Tool invocation directly from the model.

• type: "direct"

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• type: "code_execution_20250825"

• tool_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• ServerToolCaller20260120 object

• type: "code_execution_20260120"

• tool_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• input: map[unknown]

• name: string

minLength: 1

• toolset_name: optional string or null

For a toolset member tool_use, the toolset family.

minLength: 1, maxLength: 64, pattern: ^[a-zA-Z0-9_-]+$

• ServerToolUseBlock object

• type: "server_tool_use"

default: server_tool_use

• id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• caller: DirectCaller or ServerToolCaller or ServerToolCaller20260120

default: {"type":"direct"}

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• input: map[unknown]

• name: "web_search" or "web_fetch" or "code_execution" or 4 more

• "web_search"

• "web_fetch"

• "code_execution"

• "bash_code_execution"

• "text_editor_code_execution"

• "tool_search_tool_regex"

• "tool_search_tool_bm25"

• WebSearchToolResultBlock object

• type: "web_search_tool_result"

default: web_search_tool_result

• caller: DirectCaller or ServerToolCaller or ServerToolCaller20260120

default: {"type":"direct"}

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• content: WebSearchToolResultBlockContent

• WebSearchToolResultError object

• type: "web_search_tool_result_error"

default: web_search_tool_result_error

• error_code: WebSearchToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "max_uses_exceeded"

• "too_many_requests"

• "query_too_long"

• "request_too_large"

• array of WebSearchResultBlock

• type: "web_search_result"

default: web_search_result

• encrypted_content: string

• page_age: string or null

• title: string

• url: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• WebFetchToolResultBlock object

• type: "web_fetch_tool_result"

default: web_fetch_tool_result

• caller: DirectCaller or ServerToolCaller or ServerToolCaller20260120

default: {"type":"direct"}

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• content: WebFetchToolResultErrorBlock or WebFetchBlock

• WebFetchToolResultErrorBlock object

• type: "web_fetch_tool_result_error"

default: web_fetch_tool_result_error

• error_code: WebFetchToolResultErrorCode

• "invalid_tool_input"

• "url_too_long"

• "url_not_allowed"

• "url_not_in_prior_context"

• "url_not_accessible"

• "unsupported_content_type"

• "too_many_requests"

• "max_uses_exceeded"

• "unavailable"

• "content_too_large"

• WebFetchBlock object

• type: "web_fetch_result"

default: web_fetch_result

• content: DocumentBlock

• type: "document"

default: document

• citations: CitationsConfig or null

Citation configuration for the document

• enabled: boolean

default: false

• source: Base64PDFSource or PlainTextSource

• Base64PDFSource object

• type: "base64"

• data: string

format: byte

• media_type: "application/pdf"

• PlainTextSource object

• type: "text"

• data: string

• media_type: "text/plain"

• title: string or null

The title of the document

• retrieved_at: string or null

ISO 8601 timestamp when the content was retrieved

• url: string

Fetched content URL

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• CodeExecutionToolResultBlock object

• type: "code_execution_tool_result"

default: code_execution_tool_result

• content: CodeExecutionToolResultBlockContent

• CodeExecutionToolResultError object

• type: "code_execution_tool_result_error"

default: code_execution_tool_result_error

• error_code: CodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• CodeExecutionResultBlock object

• type: "code_execution_result"

default: code_execution_result

• content: array of CodeExecutionOutputBlock

• type: "code_execution_output"

default: code_execution_output

• file_id: string

• return_code: number

• stderr: string

• stdout: string

• EncryptedCodeExecutionResultBlock object

Code execution result with encrypted stdout for PFC + web_search results.

• type: "encrypted_code_execution_result"

default: encrypted_code_execution_result

• content: array of CodeExecutionOutputBlock

• type: "code_execution_output"

default: code_execution_output

• file_id: string

• encrypted_stdout: string

• return_code: number

• stderr: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• BashCodeExecutionToolResultBlock object

• type: "bash_code_execution_tool_result"

default: bash_code_execution_tool_result

• content: BashCodeExecutionToolResultError or BashCodeExecutionResultBlock

• BashCodeExecutionToolResultError object

• type: "bash_code_execution_tool_result_error"

default: bash_code_execution_tool_result_error

• error_code: BashCodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• "output_file_too_large"

• BashCodeExecutionResultBlock object

• type: "bash_code_execution_result"

default: bash_code_execution_result

• content: array of BashCodeExecutionOutputBlock

• type: "bash_code_execution_output"

default: bash_code_execution_output

• file_id: string

• return_code: number

• stderr: string

• stdout: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• TextEditorCodeExecutionToolResultBlock object

• type: "text_editor_code_execution_tool_result"

default: text_editor_code_execution_tool_result

• content: TextEditorCodeExecutionToolResultError or TextEditorCodeExecutionViewResultBlock or TextEditorCodeExecutionCreateResultBlock or TextEditorCodeExecutionStrReplaceResultBlock

• TextEditorCodeExecutionToolResultError object

• type: "text_editor_code_execution_tool_result_error"

default: text_editor_code_execution_tool_result_error

• error_code: TextEditorCodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• "file_not_found"

• error_message: string or null

• TextEditorCodeExecutionViewResultBlock object

• type: "text_editor_code_execution_view_result"

default: text_editor_code_execution_view_result

• content: string

• file_type: "text" or "image" or "pdf"

• "text"

• "image"

• "pdf"

• num_lines: number or null

• start_line: number or null

• total_lines: number or null

• TextEditorCodeExecutionCreateResultBlock object

• type: "text_editor_code_execution_create_result"

default: text_editor_code_execution_create_result

• is_file_update: boolean

• TextEditorCodeExecutionStrReplaceResultBlock object

• type: "text_editor_code_execution_str_replace_result"

default: text_editor_code_execution_str_replace_result

• lines: array of string or null

• new_lines: number or null

• new_start: number or null

• old_lines: number or null

• old_start: number or null

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• ToolSearchToolResultBlock object

• type: "tool_search_tool_result"

default: tool_search_tool_result

• content: ToolSearchToolResultError or ToolSearchToolSearchResultBlock

• ToolSearchToolResultError object

• type: "tool_search_tool_result_error"

default: tool_search_tool_result_error

• error_code: ToolSearchToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• error_message: string or null

• ToolSearchToolSearchResultBlock object

• type: "tool_search_tool_search_result"

default: tool_search_tool_search_result

• tool_references: array of ToolReferenceBlock

• type: "tool_reference"

default: tool_reference

• tool_name: string

minLength: 1, maxLength: 256, pattern: ^[a-zA-Z0-9_-]{1,256}$

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• ContainerUploadBlock object

Response model for a file uploaded to the container.

• type: "container_upload"

default: container_upload

• file_id: string

• diagnostics: Diagnostics or null

Request-level diagnostics. null when the request did not supply diagnostics, or when it did and no prompt-cache divergence was detected.

• cache_miss_reason: CacheMissReason or null

Explains why the prompt cache could not fully reuse the prefix from the request identified by diagnostics.previous_message_id. null means diagnosis is still pending — the response was serialized before the background comparison completed.

• CacheMissModelChanged object

• type: "model_changed"

default: model_changed

• cache_missed_input_tokens: number

Approximate number of input tokens that would have been read from cache had the prefix matched the previous request.

• CacheMissSystemChanged object

• type: "system_changed"

default: system_changed

• cache_missed_input_tokens: number

Approximate number of input tokens that would have been read from cache had the prefix matched the previous request.

• CacheMissToolsChanged object

• type: "tools_changed"

default: tools_changed

• cache_missed_input_tokens: number

Approximate number of input tokens that would have been read from cache had the prefix matched the previous request.

• CacheMissMessagesChanged object

• type: "messages_changed"

default: messages_changed

• cache_missed_input_tokens: number

Approximate number of input tokens that would have been read from cache had the prefix matched the previous request.

• CacheMissPreviousMessageNotFound object

• type: "previous_message_not_found"

default: previous_message_not_found

• CacheMissUnavailable object

• type: "unavailable"

default: unavailable

• model: Model

The model that will complete your prompt.

See models for additional details and options.

• string

• "haijun-fable-5-1" or "haijun-opus-5-5" or "haijun-mythos-5-1" or 15 more

The model that will complete your prompt.

See models for additional details and options.

• "haijun-fable-5-1"

Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows

• "haijun-opus-5-5"

Powerful intelligence for coding, knowledge work, and long-running agents

• "haijun-mythos-5-1"

Our most capable model for cybersecurity and biology research, available through trusted access programs

• "haijun-sonnet-5"

High-performance model for coding and agents

• "haijun-fable-5"

Next generation of intelligence for the hardest knowledge work and coding problems

• "haijun-mythos-5"

Most capable model for cybersecurity and biology research

• "haijun-opus-5"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-8"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-7"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-6"

Powerful intelligence for long-running agents and coding

• "haijun-sonnet-4-6"

Best combination of speed and intelligence

• "haijun-haiku-4-5"

Fastest model with near-frontier intelligence

• "haijun-haiku-4-5-20251001"

Fastest model with near-frontier intelligence

• "haijun-opus-4-5"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-5-20251101"

Powerful intelligence for long-running agents and coding

• "haijun-sonnet-4-5"

High-performance model for agents and coding

• "haijun-sonnet-4-5-20250929"

High-performance model for agents and coding

• "haijun-mythos-preview"

Deprecated: Will reach end-of-life on June 30, 2026. Please migrate to haijun-mythos-5. Visit https://raw.haijun.my.id/docs/ for more information.

New class of intelligence, strongest in coding and cybersecurity

• role: "assistant"

Conversational role of the generated message.

This will always be "assistant".

default: assistant

• stop_details: RefusalStopDetails or null

Structured information about why model output stopped.

This is null when the stop_reason has no additional detail to report.

• type: "refusal"

default: refusal

• category: "cyber" or "bio" or "frontier_llm" or 2 more or null

The policy category that triggered the refusal.

null when the refusal doesn't map to a named category.

• "cyber"

The request could enable cyber harm, such as malware or exploit development. Benign cybersecurity work can also trigger this category.

• "bio"

The request could enable biological harm, such as dangerous lab methods. Beneficial life sciences work can also trigger this category.

• "frontier_llm"

The request could assist the development of competing AI models, which is restricted under Juglow's commercial terms. Benign machine learning work can also trigger this category.

• "reasoning_extraction"

The request asks the model to reproduce its internal reasoning in the response text. To get reasoning in a structured form instead, use adaptive thinking.

• "general_harms"

The request could be related to an area that was determined as harmful. Benign work might sometimes trigger this category.

• explanation: string or null

Human-readable explanation of the refusal.

This text is not guaranteed to be stable. null when no explanation is available for the category.

• stop_reason: StopReason or null

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
• "model_context_window_exceeded": we exceeded the model's context window

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.

• "end_turn"

• "max_tokens"

• "stop_sequence"

• "tool_use"

• "pause_turn"

• "refusal"

• "model_context_window_exceeded"

• stop_sequence: string or null

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.

• usage: Usage

Billing and rate-limit usage.

Juglow'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 Haijun.

Total input tokens in a request is the summation of input_tokens, cache_creation_input_tokens, and cache_read_input_tokens.

• cache_creation: CacheCreation or null

Breakdown of cached tokens by TTL

• ephemeral_1h_input_tokens: number

The number of input tokens used to create the 1 hour cache entry.

default: 0, minimum: 0

• ephemeral_5m_input_tokens: number

The number of input tokens used to create the 5 minute cache entry.

default: 0, minimum: 0

• cache_creation_input_tokens: number or null

The number of input tokens used to create the cache entry.

minimum: 0

• cache_read_input_tokens: number or null

The number of input tokens read from the cache.

minimum: 0

• inference_geo: string or null

The geographic region where inference was performed for this request.

• input_tokens: number

The number of input tokens which were used.

minimum: 0

• output_tokens: number

The number of output tokens which were used.

minimum: 0

• output_tokens_details: OutputTokensDetails or null

Breakdown of output tokens by category.

output_tokens remains the inclusive, authoritative total used for billing. This object provides a read-only decomposition for observability — for example, how many of the billed output tokens were spent on internal reasoning that may have been summarized before being returned to you.

• thinking_tokens: number

Number of output tokens the model generated as internal reasoning, including the thinking-block delimiter tokens.

Reflects the raw reasoning the model produced, not the (possibly shorter) summarized thinking text returned in the response body. Computed by re-tokenizing the raw reasoning text, so it may differ from the model's exact generation count by a small number of tokens. Always ≤ output_tokens; output_tokens - thinking_tokens approximates the non-reasoning output.

default: 0, minimum: 0

• server_tool_use: ServerToolUsage or null

The number of server tool requests.

• web_fetch_requests: number

The number of web fetch tool requests.

default: 0, minimum: 0

• web_search_requests: number

The number of web search tool requests.

default: 0, minimum: 0

• service_tier: "standard" or "priority" or "batch" or null

If the request used the priority, standard, or batch tier.

• "standard"

• "priority"

• "batch"

• RawMessageStreamEvent = RawMessageStartEvent or RawMessageDeltaEvent or RawMessageStopEvent or 3 more

• RawMessageStartEvent object

• type: "message_start"

default: message_start

• message: Message

• RawMessageDeltaEvent object

• type: "message_delta"

default: message_delta

• delta: object

• container: Container or null

Information about the container used in this request.

This will be non-null if a container tool (e.g. code execution) was used.

• stop_details: RefusalStopDetails or null

Structured information about why model output stopped.

This is null when the stop_reason has no additional detail to report.

• stop_reason: StopReason or null

• stop_sequence: string or null

• usage: MessageDeltaUsage

Billing and rate-limit usage.

Juglow'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 Haijun.

Total input tokens in a request is the summation of input_tokens, cache_creation_input_tokens, and cache_read_input_tokens.

• cache_creation_input_tokens: number or null

The cumulative number of input tokens used to create the cache entry.

minimum: 0

• cache_read_input_tokens: number or null

The cumulative number of input tokens read from the cache.

minimum: 0

• input_tokens: number or null

The cumulative number of input tokens which were used.

minimum: 0

• output_tokens: number

The cumulative number of output tokens which were used.

• output_tokens_details: OutputTokensDetails or null

Breakdown of output tokens by category.

output_tokens remains the inclusive, authoritative total used for billing. This object provides a read-only decomposition for observability — for example, how many of the billed output tokens were spent on internal reasoning that may have been summarized before being returned to you.

• server_tool_use: ServerToolUsage or null

The number of server tool requests.

• RawMessageStopEvent object

• type: "message_stop"

default: message_stop

• RawContentBlockStartEvent object

• type: "content_block_start"

default: content_block_start

• content_block: TextBlock or ThinkingBlock or RedactedThinkingBlock or 9 more

• TextBlock object

• ThinkingBlock object

• RedactedThinkingBlock object

• ToolUseBlock object

• ServerToolUseBlock object

• WebSearchToolResultBlock object

• WebFetchToolResultBlock object

• CodeExecutionToolResultBlock object

• BashCodeExecutionToolResultBlock object

• TextEditorCodeExecutionToolResultBlock object

• ToolSearchToolResultBlock object

• ContainerUploadBlock object

Response model for a file uploaded to the container.

• index: number

• RawContentBlockDeltaEvent object

• type: "content_block_delta"

default: content_block_delta

• delta: RawContentBlockDelta

• TextDelta object

• type: "text_delta"

default: text_delta

• text: string

• InputJSONDelta object

• type: "input_json_delta"

default: input_json_delta

• partial_json: string

• CitationsDelta object

• type: "citations_delta"

default: citations_delta

• citation: CitationCharLocation or CitationPageLocation or CitationContentBlockLocation or 2 more

• CitationCharLocation object

• CitationPageLocation object

• CitationContentBlockLocation object

• CitationsWebSearchResultLocation object

• CitationsSearchResultLocation object

• ThinkingDelta object

• type: "thinking_delta"

default: thinking_delta

• thinking: string

The incremental thinking text for this content block. Concatenate the thinking values of successive thinking_delta events to assemble the block's full thinking value.

• SignatureDelta object

• type: "signature_delta"

default: signature_delta

• signature: string

The signature for this thinking block: an opaque value used to verify that the block was generated by Haijun when it is passed back to the API. Delivered in a signature_delta event just before the block's content_block_stop event.

• index: number

• RawContentBlockStopEvent object

• type: "content_block_stop"

default: content_block_stop

• index: number

#Example

curl https://haijun.my.id/v1/messages \
    -H 'Content-Type: application/json' \
    -H 'juglow-version: 2023-06-01' \
    -H "X-Api-Key: $JUGLOW_API_KEY" \
    --max-time 600 \
    -d '{
          "max_tokens": 1024,
          "messages": [
            {
              "content": "Hello, world",
              "role": "user"
            }
          ],
          "model": "haijun-opus-5",
          "stream": false,
          "system": [
            {
              "text": "Today'\''s date is 2024-06-01.",
              "type": "text"
            }
          ],
          "temperature": 1,
          "thinking": {
            "type": "adaptive"
          },
          "tools": [
            {
              "input_schema": {
                "type": "object",
                "properties": {
                  "location": "bar",
                  "unit": "bar"
                },
                "required": [
                  "location"
                ]
              },
              "name": "name"
            }
          ],
          "top_k": 5,
          "top_p": 0.7
        }'

#Response (200)

{
  "id": "msg_013Zva2CMHLNnXjNJJKqJ2EF",
  "container": {
    "id": "container_011CpZohnwH4vuy7gazohgSP",
    "expires_at": "2019-12-27T18:11:19.117Z",
    "tracks": [
      {
        "skill_id": "pdf",
        "type": "juglow",
        "version": "latest"
      }
    ]
  },
  "content": [
    {
      "citations": [
        {
          "cited_text": "The grass is green. The sky is blue.",
          "document_index": 0,
          "document_title": "My Document",
          "end_char_index": 0,
          "file_id": "file_011CNha8iCJcU1wXNR6q4V8w",
          "start_char_index": 0,
          "type": "char_location"
        }
      ],
      "text": "Hi! My name is Haijun.",
      "type": "text"
    }
  ],
  "diagnostics": {
    "cache_miss_reason": {
      "cache_missed_input_tokens": 0,
      "type": "model_changed"
    }
  },
  "model": "haijun-opus-5",
  "role": "assistant",
  "stop_details": {
    "category": "cyber",
    "explanation": "This request was declined because it conflicts with Juglow's Usage Policy.",
    "type": "refusal"
  },
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "type": "message",
  "usage": {
    "cache_creation": {
      "ephemeral_1h_input_tokens": 0,
      "ephemeral_5m_input_tokens": 0
    },
    "cache_creation_input_tokens": 2051,
    "cache_read_input_tokens": 2051,
    "inference_geo": "global",
    "input_tokens": 2095,
    "output_tokens": 503,
    "output_tokens_details": {
      "thinking_tokens": 0
    },
    "server_tool_use": {
      "web_fetch_requests": 2,
      "web_search_requests": 0
    },
    "service_tier": "standard"
  }
}

#Count tokens in a Message

POST /v1/messages/count_tokens

Count the number of tokens in a Message.

The Token Count API can be used to count the number of tokens in a Message, including tools, images, and documents, without creating it.

Learn more about token counting in our user guide

#Headers

• "juglow-user-profile-id": optional string

The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization. Requires the user-profiles beta header.

• "juglow-workspace-id": optional string

Optional header to select the Workspace for this request. The value is a Workspace ID (for example, wrkspc_011CZkZaBF1tNoB5wlCeusgy).

Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.

#Body parameters

• messages: array of MessageParam

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, Haijun"}]

Example with multiple conversational turns:

  [
    {"role": "user", "content": "Hello there."},
    {"role": "assistant", "content": "Hi, I'm Haijun. How can I help you?"},
    {"role": "user", "content": "Can you explain LLMs in plain English?"},
  ]

Example with a partially-filled response from Haijun:

  [
    {"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, Haijun"}

  {"role": "user", "content": [{"type": "text", "text": "Hello, Haijun"}]}

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: string or array of ContentBlockParam

• string

• array of ContentBlockParam

• TextBlockParam object

• type: "text"

• text: string

minLength: 1

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• type: "ephemeral"

• ttl: optional "5m" or "1h"

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. See prompt caching pricing for details.

• "5m"

• "1h"

• citations: optional array of TextCitationParam or null

• CitationCharLocationParam object

• type: "char_location"

• cited_text: string

• document_index: number

minimum: 0

• document_title: string or null

minLength: 1, maxLength: 500

• end_char_index: number

• start_char_index: number

minimum: 0

• CitationPageLocationParam object

• type: "page_location"

• cited_text: string

• document_index: number

minimum: 0

• document_title: string or null

minLength: 1, maxLength: 500

• end_page_number: number

• start_page_number: number

minimum: 1

• CitationContentBlockLocationParam object

• type: "content_block_location"

• cited_text: 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.

• document_index: number

minimum: 0

• document_title: string or null

minLength: 1, maxLength: 500

• end_block_index: number

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.

• start_block_index: number

0-based index of the first cited block in the source's content array.

minimum: 0

• CitationWebSearchResultLocationParam object

• type: "web_search_result_location"

• cited_text: string

• encrypted_index: string

• title: string or null

minLength: 1, maxLength: 512

• url: string

minLength: 1

• CitationSearchResultLocationParam object

• type: "search_result_location"

• cited_text: 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.

• end_block_index: number

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.

• search_result_index: number

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.

minimum: 0

• source: string

• start_block_index: number

0-based index of the first cited block in the source's content array.

minimum: 0

• title: string or null

• ImageBlockParam object

• type: "image"

• source: Base64ImageSource or URLImageSource or FileImageSource

• Base64ImageSource object

• type: "base64"

• data: string

format: byte

• media_type: "image/jpeg" or "image/png" or "image/gif" or "image/webp"

• "image/jpeg"

• "image/png"

• "image/gif"

• "image/webp"

• URLImageSource object

• type: "url"

• url: string

• FileImageSource object

• type: "file"

• file_id: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• transformations: optional ImageTransformationsParam or null

Configures the transformations the server applies to this image before the model observes it. Each key names a condition the server transforms images for; its value selects the transformation applied. Omitted keys keep their default behavior, and an empty object is equivalent to omitting the field.

• oversized_image: optional "downsize" or "error"

What the server does when this image exceeds the model's maximum image size. "downsize" (the default) scales the image down to fit, which changes the dimensions the model observes without telling you. "error" instead rejects the request with a 400 error naming the image's dimensions and the largest dimensions that fit, so you can scale the image deliberately — your image is never silently scaled down.

• "downsize"

• "error"

• DocumentBlockParam object

• type: "document"

• source: Base64PDFSource or PlainTextSource or ContentBlockSource or 2 more

• Base64PDFSource object

• type: "base64"

• data: string

format: byte

• media_type: "application/pdf"

• PlainTextSource object

• type: "text"

• data: string

• media_type: "text/plain"

• ContentBlockSource object

• type: "content"

• content: string or array of ContentBlockSourceContent

• string

• ContentBlockSourceContent = array of ContentBlockSourceContent

• TextBlockParam object

• ImageBlockParam object

• URLPDFSource object

• type: "url"

• url: string

• FileDocumentSource object

• type: "file"

• file_id: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam or null

• enabled: optional boolean

• context: optional string or null

minLength: 1

• title: optional string or null

minLength: 1, maxLength: 500

• SearchResultBlockParam object

• type: "search_result"

• content: array of TextBlockParam

• type: "text"

• text: string

minLength: 1

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional array of TextCitationParam or null

• source: string

• title: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional CitationsConfigParam

• ThinkingBlockParam object

• type: "thinking"

• signature: string

The signature value of this thinking block, exactly as returned by the API in a previous response. Used to verify that the block was generated by Haijun.

Thinking blocks must be passed back unmodified and in their original order; a modified block results in a 400 invalid_request_error.

• thinking: string

The thinking text of this block as returned by the API.

• RedactedThinkingBlockParam object

• type: "redacted_thinking"

• data: string

The data value of this redacted thinking block, exactly as returned by the API in a previous response. Opaque and encrypted; pass it back unchanged.

• ToolUseBlockParam object

• type: "tool_use"

• id: string

pattern: ^[a-zA-Z0-9_-]+$

• input: map[unknown]

• name: string

minLength: 1, maxLength: 200

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• type: "direct"

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• type: "code_execution_20250825"

• tool_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• ServerToolCaller20260120 object

• type: "code_execution_20260120"

• tool_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• toolset_name: optional string or null

For a toolset member tool_use, the toolset family this member belongs to.

minLength: 1, maxLength: 64, pattern: ^[a-zA-Z0-9_-]+$

• ToolResultBlockParam object

• type: "tool_result"

• tool_use_id: string

pattern: ^[a-zA-Z0-9_-]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• content: optional string or array of TextBlockParam or ImageBlockParam or SearchResultBlockParam or 3 more

• string

• array of TextBlockParam or ImageBlockParam or SearchResultBlockParam or 3 more

• TextBlockParam object

• ImageBlockParam object

• SearchResultBlockParam object

• DocumentBlockParam object

• ToolReferenceBlockParam object

Tool reference block that can be included in tool_result content.

• type: "tool_reference"

• tool_name: string

minLength: 1, maxLength: 256, pattern: ^[a-zA-Z0-9_-]{1,256}$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• BrowserStateBlockParam object

The caller's browser state after a browser toolset member call — the full inventory of open tabs, which tab is active, and any side effects (tabs opened, download state changes) the call produced.

At most one per tool_result, only on a non-error result answering a browser toolset member tool_use. The server renders the model-visible text from it; the model never sees the raw fields.

• type: "browser_state"

• tabs: array of BrowserStateTabEntry

All tabs open in the browser after this call — the full inventory, not a delta. May be empty. Whenever non-empty, exactly one entry carries active: true.

maxItems: 100

• tab_id: string

The caller-assigned identifier for this tab, unique within the inventory.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• title: string

The title of the page the tab is showing. May be empty.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The URL of the page the tab is showing. May be empty.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• active: optional boolean

Whether this tab is the active tab after this call. Whenever tabs is non-empty, exactly one entry is marked active: true.

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• state_changes: optional array of BrowserStateChange or null

Tabs opened and download state changes during this call. "Nothing to report" is expressed by omitting the field, never by an empty list.

minItems: 1, maxItems: 200

• BrowserStateChangeTabOpened object

A tab this call's execution opened that remains open at its end — the creation delta of the tabs inventory, not an event log.

Carries only the tab_id; the tab's title and url live on its tabs entry, which must include the same tab_id. A tab opened during a failed call gets no deferred tab_opened; it simply appears in the next result's tabs inventory.

• type: "tab_opened"

• tab_id: string

The tab_id of the opened tab, present in tabs.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• BrowserStateChangeDownloadStarted object

A file download that started during this call.

• type: "download_started"

• download_id: string

The caller-assigned identifier for this download, stable across the state changes reporting it.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The final post-redirect URL the download was served from.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• BrowserStateChangeDownloadCompleted object

A file download that finished during this call, reported with the same download_id as its download_started — or without a prior download_started, when the download finished during the call that started it (at most one state change per download_id per result).

• type: "download_completed"

• download_id: string

The caller-assigned identifier for this download, stable across the state changes reporting it.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The final post-redirect URL the download was served from.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• path: optional string or null

Where the executor saved the file, on the executor's filesystem. Only included when another tool in the same environment can read the file at that path.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• size_bytes: optional number or null

The completed download's size.

minimum: 0

• BrowserStateChangeDownloadFailed object

A file download that failed — or was cancelled — during this call.

• type: "download_failed"

• download_id: string

The caller-assigned identifier for this download, stable across the state changes reporting it.

minLength: 1, maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• url: string

The final post-redirect URL the download was served from.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• error: optional string or null

The failure or cancellation detail, when known.

maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$

• is_error: optional boolean

• toolset_name: optional string or null

For a toolset member tool_result, the toolset family of the paired tool_use.

minLength: 1, maxLength: 64, pattern: ^[a-zA-Z0-9_-]+$

• ServerToolUseBlockParam object

• type: "server_tool_use"

• id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• input: map[unknown]

• name: "web_search" or "web_fetch" or "code_execution" or 4 more

• "web_search"

• "web_fetch"

• "code_execution"

• "bash_code_execution"

• "text_editor_code_execution"

• "tool_search_tool_regex"

• "tool_search_tool_bm25"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• WebSearchToolResultBlockParam object

• type: "web_search_tool_result"

• content: WebSearchToolResultBlockParamContent

• WebSearchToolResultBlockItem = array of WebSearchResultBlockParam

• type: "web_search_result"

• encrypted_content: string

• title: string

• url: string

• page_age: optional string or null

• WebSearchToolRequestError object

• type: "web_search_tool_result_error"

• error_code: WebSearchToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "max_uses_exceeded"

• "too_many_requests"

• "query_too_long"

• "request_too_large"

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• WebFetchToolResultBlockParam object

• type: "web_fetch_tool_result"

• content: WebFetchToolResultErrorBlockParam or WebFetchBlockParam

• WebFetchToolResultErrorBlockParam object

• type: "web_fetch_tool_result_error"

• error_code: WebFetchToolResultErrorCode

• "invalid_tool_input"

• "url_too_long"

• "url_not_allowed"

• "url_not_in_prior_context"

• "url_not_accessible"

• "unsupported_content_type"

• "too_many_requests"

• "max_uses_exceeded"

• "unavailable"

• "content_too_large"

• WebFetchBlockParam object

• type: "web_fetch_result"

• content: DocumentBlockParam

• url: string

Fetched content URL

• retrieved_at: optional string or null

ISO 8601 timestamp when the content was retrieved

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• caller: optional DirectCaller or ServerToolCaller or ServerToolCaller20260120

• DirectCaller object

Tool invocation directly from the model.

• ServerToolCaller object

Tool invocation generated by a server-side tool.

• ServerToolCaller20260120 object

• CodeExecutionToolResultBlockParam object

• type: "code_execution_tool_result"

• content: CodeExecutionToolResultBlockParamContent

• CodeExecutionToolResultErrorParam object

• type: "code_execution_tool_result_error"

• error_code: CodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• CodeExecutionResultBlockParam object

• type: "code_execution_result"

• content: array of CodeExecutionOutputBlockParam

• type: "code_execution_output"

• file_id: string

• return_code: number

• stderr: string

• stdout: string

• EncryptedCodeExecutionResultBlockParam object

Code execution result with encrypted stdout for PFC + web_search results.

• type: "encrypted_code_execution_result"

• content: array of CodeExecutionOutputBlockParam

• type: "code_execution_output"

• file_id: string

• encrypted_stdout: string

• return_code: number

• stderr: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• BashCodeExecutionToolResultBlockParam object

• type: "bash_code_execution_tool_result"

• content: BashCodeExecutionToolResultErrorParam or BashCodeExecutionResultBlockParam

• BashCodeExecutionToolResultErrorParam object

• type: "bash_code_execution_tool_result_error"

• error_code: BashCodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• "output_file_too_large"

• BashCodeExecutionResultBlockParam object

• type: "bash_code_execution_result"

• content: array of BashCodeExecutionOutputBlockParam

• type: "bash_code_execution_output"

• file_id: string

• return_code: number

• stderr: string

• stdout: string

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• TextEditorCodeExecutionToolResultBlockParam object

• type: "text_editor_code_execution_tool_result"

• content: TextEditorCodeExecutionToolResultErrorParam or TextEditorCodeExecutionViewResultBlockParam or TextEditorCodeExecutionCreateResultBlockParam or TextEditorCodeExecutionStrReplaceResultBlockParam

• TextEditorCodeExecutionToolResultErrorParam object

• type: "text_editor_code_execution_tool_result_error"

• error_code: TextEditorCodeExecutionToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• "file_not_found"

• error_message: optional string or null

• TextEditorCodeExecutionViewResultBlockParam object

• type: "text_editor_code_execution_view_result"

• content: string

• file_type: "text" or "image" or "pdf"

• "text"

• "image"

• "pdf"

• num_lines: optional number or null

• start_line: optional number or null

• total_lines: optional number or null

• TextEditorCodeExecutionCreateResultBlockParam object

• type: "text_editor_code_execution_create_result"

• is_file_update: boolean

• TextEditorCodeExecutionStrReplaceResultBlockParam object

• type: "text_editor_code_execution_str_replace_result"

• lines: optional array of string or null

• new_lines: optional number or null

• new_start: optional number or null

• old_lines: optional number or null

• old_start: optional number or null

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• ToolSearchToolResultBlockParam object

• type: "tool_search_tool_result"

• content: ToolSearchToolResultErrorParam or ToolSearchToolSearchResultBlockParam

• ToolSearchToolResultErrorParam object

• type: "tool_search_tool_result_error"

• error_code: ToolSearchToolResultErrorCode

• "invalid_tool_input"

• "unavailable"

• "too_many_requests"

• "execution_time_exceeded"

• error_message: optional string or null

• ToolSearchToolSearchResultBlockParam object

• type: "tool_search_tool_search_result"

• tool_references: array of ToolReferenceBlockParam

• type: "tool_reference"

• tool_name: string

minLength: 1, maxLength: 256, pattern: ^[a-zA-Z0-9_-]{1,256}$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• tool_use_id: string

pattern: ^srvtoolu_[a-zA-Z0-9_]+$

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• ContainerUploadBlockParam object

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.

• type: "container_upload"

• file_id: string

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• role: "user" or "assistant" or "system"

• "user"

• "assistant"

• "system"

• model: Model

The model that will complete your prompt.

See models for additional details and options.

• string

• "haijun-fable-5-1" or "haijun-opus-5-5" or "haijun-mythos-5-1" or 15 more

The model that will complete your prompt.

See models for additional details and options.

• "haijun-fable-5-1"

Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows

• "haijun-opus-5-5"

Powerful intelligence for coding, knowledge work, and long-running agents

• "haijun-mythos-5-1"

Our most capable model for cybersecurity and biology research, available through trusted access programs

• "haijun-sonnet-5"

High-performance model for coding and agents

• "haijun-fable-5"

Next generation of intelligence for the hardest knowledge work and coding problems

• "haijun-mythos-5"

Most capable model for cybersecurity and biology research

• "haijun-opus-5"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-8"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-7"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-6"

Powerful intelligence for long-running agents and coding

• "haijun-sonnet-4-6"

Best combination of speed and intelligence

• "haijun-haiku-4-5"

Fastest model with near-frontier intelligence

• "haijun-haiku-4-5-20251001"

Fastest model with near-frontier intelligence

• "haijun-opus-4-5"

Powerful intelligence for long-running agents and coding

• "haijun-opus-4-5-20251101"

Powerful intelligence for long-running agents and coding

• "haijun-sonnet-4-5"

High-performance model for agents and coding

• "haijun-sonnet-4-5-20250929"

High-performance model for agents and coding

• "haijun-mythos-preview"

Deprecated: Will reach end-of-life on June 30, 2026. Please migrate to haijun-mythos-5. Visit https://raw.haijun.my.id/docs/ for more information.

New class of intelligence, strongest in coding and cybersecurity

• cache_control: optional CacheControlEphemeral or null

Top-level cache control automatically applies a cache_control marker to the last cacheable block in the request.

• output_config: optional OutputConfig

Configuration options for the model's output, such as the output format.

• effort: optional "low" or "medium" or "high" or 2 more or null

How much effort the model should put into its response. Higher effort levels may result in more thorough analysis but take longer.

Valid values are low, medium, high, xhigh, or max.

• "low"

• "medium"

• "high"

• "xhigh"

• "max"

• format: optional JSONOutputFormat or null

A schema to specify Haijun's output format in responses. See structured outputs

• type: "json_schema"

• schema: map[unknown]

The JSON schema of the format

• system: optional string or array of TextBlockParam

System prompt.

A system prompt is a way of providing context and instructions to Haijun, such as specifying a particular goal or role. See our guide to system prompts.

• string

• array of TextBlockParam

• type: "text"

• text: string

minLength: 1

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• citations: optional array of TextCitationParam or null

• thinking: optional ThinkingConfigParam

Configuration for enabling Haijun's extended thinking.

When enabled, responses include thinking content blocks showing Haijun'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.

• ThinkingConfigEnabled object

• type: "enabled"

• budget_tokens: number

Determines how many tokens Haijun can use for its internal reasoning process. Larger budgets can enable more thorough analysis for complex problems, improving response quality.

Must be ≥1024 and less than max_tokens.

See extended thinking for details.

minimum: 1024

• display: optional "summarized" or "omitted" or null

Controls how thinking content appears in the response. When set to summarized, thinking is returned normally. When set to omitted, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to summarized.

• "summarized"

• "omitted"

• ThinkingConfigDisabled object

• type: "disabled"

• ThinkingConfigAdaptive object

• type: "adaptive"

• display: optional "summarized" or "omitted" or null

Controls how thinking content appears in the response. When set to summarized, thinking is returned normally. When set to omitted, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to summarized.

• "summarized"

• "omitted"

• tool_choice: optional ToolChoice

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.

• ToolChoiceAuto object

The model will automatically decide whether to use tools.

• type: "auto"

• disable_parallel_tool_use: optional boolean

Whether to disable parallel tool use.

Defaults to false. If set to true, the model will output at most one tool use.

• ToolChoiceAny object

The model will use any available tools.

• type: "any"

• disable_parallel_tool_use: optional boolean

Whether to disable parallel tool use.

Defaults to false. If set to true, the model will output exactly one tool use.

• ToolChoiceTool object

The model will use the specified tool with tool_choice.name.

• type: "tool"

• name: string

The name of the tool to use.

• disable_parallel_tool_use: optional boolean

Whether to disable parallel tool use.

Defaults to false. If set to true, the model will output exactly one tool use.

• ToolChoiceNone object

The model will not be allowed to use tools.

• type: "none"

• tools: optional array of MessageCountTokensTool

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.

• Tool object

• type: optional "custom" or null

• input_schema: object

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"

• properties: optional map[unknown] or null

• required: optional array of string or null

• name: string

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

minLength: 1, maxLength: 128, pattern: ^[a-zA-Z0-9_-]{1,128}$

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• description: optional 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.

• eager_input_streaming: optional boolean or null

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.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolBash20250124 object

• type: "bash_20250124"

• name: "bash"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20250522 object

• type: "code_execution_20250522"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20250825 object

• type: "code_execution_20250825"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20260120 object

Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint).

• type: "code_execution_20260120"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• CodeExecutionTool20260521 object

Code execution tool with REPL state persistence.

• type: "code_execution_20260521"

• name: "code_execution"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• BrowserToolset20260801 object

The browser toolset: a single tools[] entry (carrying no name) that declares the browser tool family. The model is served the family's tool with any members disabled via configs removed from its schema.

• type: "browser_toolset_20260801"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• configs: optional BrowserToolsetConfigs or null

Sparse per-member overrides, keyed by member name. Absent, null, and {} are equivalent; a member's defaults apply wherever its key is absent.

• type: optional BrowserTypeConfig or null

type's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• close_tab: optional BrowserCloseTabConfig or null

close_tab's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• double_click: optional BrowserDoubleClickConfig or null

double_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• file_upload: optional BrowserFileUploadConfig or null

file_upload's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• find: optional BrowserFindConfig or null

find's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• form_input: optional BrowserFormInputConfig or null

form_input's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• get_page_text: optional BrowserGetPageTextConfig or null

get_page_text's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• hold_key: optional BrowserHoldKeyConfig or null

hold_key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• hover: optional BrowserHoverConfig or null

hover's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• javascript_exec: optional BrowserJavascriptExecConfig or null

javascript_exec's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• key: optional BrowserKeyConfig or null

key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click: optional BrowserLeftClickConfig or null

left_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click_drag: optional BrowserLeftClickDragConfig or null

left_click_drag's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_down: optional BrowserLeftMouseDownConfig or null

left_mouse_down's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_up: optional BrowserLeftMouseUpConfig or null

left_mouse_up's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• list_tabs: optional BrowserListTabsConfig or null

list_tabs's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• middle_click: optional BrowserMiddleClickConfig or null

middle_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• mouse_move: optional BrowserMouseMoveConfig or null

mouse_move's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• navigate: optional BrowserNavigateConfig or null

navigate's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• new_tab: optional BrowserNewTabConfig or null

new_tab's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• read_console: optional BrowserReadConsoleConfig or null

read_console's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• read_network: optional BrowserReadNetworkConfig or null

read_network's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• read_page: optional BrowserReadPageConfig or null

read_page's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• right_click: optional BrowserRightClickConfig or null

right_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• screenshot: optional BrowserScreenshotConfig or null

screenshot's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• scroll: optional BrowserScrollConfig or null

scroll's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• scroll_to: optional BrowserScrollToConfig or null

scroll_to's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• switch_tab: optional BrowserSwitchTabConfig or null

switch_tab's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• triple_click: optional BrowserTripleClickConfig or null

triple_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• wait: optional BrowserWaitConfig or null

wait's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• zoom: optional BrowserZoomConfig or null

zoom's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• MemoryTool20250818 object

• type: "memory_20250818"

• name: "memory"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ComputerToolset20260801 object

The computer toolset: a single tools[] entry (carrying no name) that declares the computer tool family. The model is served the family's tool with any members disabled via configs removed from its schema. Every member is enabled by default, zoom included. The single-tool options display_number and enable_zoom are not fields of a toolset entry — it carries only type, configs, and cache_control; zoom is controlled via configs.zoom.enabled.

• type: "computer_toolset_20260801"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• configs: optional ComputerToolsetConfigs or null

Sparse per-member overrides, keyed by member name. Absent, null, and {} are equivalent; a member's defaults apply wherever its key is absent.

• type: optional ComputerTypeConfig or null

type's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• cursor_position: optional ComputerCursorPositionConfig or null

cursor_position's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• double_click: optional ComputerDoubleClickConfig or null

double_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• hold_key: optional ComputerHoldKeyConfig or null

hold_key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• key: optional ComputerKeyConfig or null

key's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click: optional ComputerLeftClickConfig or null

left_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_click_drag: optional ComputerLeftClickDragConfig or null

left_click_drag's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_down: optional ComputerLeftMouseDownConfig or null

left_mouse_down's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• left_mouse_up: optional ComputerLeftMouseUpConfig or null

left_mouse_up's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• middle_click: optional ComputerMiddleClickConfig or null

middle_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• mouse_move: optional ComputerMouseMoveConfig or null

mouse_move's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• right_click: optional ComputerRightClickConfig or null

right_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• screenshot: optional ComputerScreenshotConfig or null

screenshot's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• scroll: optional ComputerScrollConfig or null

scroll's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• triple_click: optional ComputerTripleClickConfig or null

triple_click's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• wait: optional ComputerWaitConfig or null

wait's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• zoom: optional ComputerZoomConfig or null

zoom's config overrides.

• defer_loading: optional boolean or null

Defer loading for this member. Must resolve to the same value on every enabled member of the toolset.

• enabled: optional boolean or null

Whether this member is offered to the model. Default is per member, per the toolset's documentation. A member whose enabled resolves false is withheld from the served schema.

• ToolTextEditor20250124 object

• type: "text_editor_20250124"

• name: "str_replace_editor"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolTextEditor20250429 object

• type: "text_editor_20250429"

• name: "str_replace_based_edit_tool"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• ToolTextEditor20250728 object

• type: "text_editor_20250728"

• name: "str_replace_based_edit_tool"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• input_examples: optional array of map[unknown]

• max_characters: optional number or null

Maximum number of characters to display when viewing a file. If not specified, defaults to displaying the full file.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• WebSearchTool20250305 object

• type: "web_search_20250305"

• name: "web_search"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

If provided, only these domains will be included in results. Cannot be used alongside blocked_domains.

• blocked_domains: optional array of string or null

If provided, these domains will never appear in results. Cannot be used alongside allowed_domains.

• cache_control: optional CacheControlEphemeral or null

Create a cache control breakpoint at this content block.

• defer_loading: optional boolean

If true, tool will not be included in initial system prompt. Only loaded when returned via tool_reference from tool search.

• max_uses: optional number or null

Maximum number of times the tool can be used in the API request.

minimum: 1

• strict: optional boolean

When true, guarantees schema validation on tool names and inputs

• user_location: optional UserLocation or null

Parameters for the user's location. Used to provide more relevant search results.

• type: "approximate"

• city: optional string or null

The city of the user.

minLength: 1, maxLength: 255

• country: optional string or null

The two letter ISO country code of the user.

minLength: 2, maxLength: 2

• region: optional string or null

The region of the user.

minLength: 1, maxLength: 255

• timezone: optional string or null

The IANA timezone of the user.

minLength: 1, maxLength: 255

• WebFetchTool20250910 object

• type: "web_fetch_20250910"

• name: "web_fetch"

Name of the tool.

This is how the tool will be called by the model and in tool_use blocks.

• allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"

• "direct"

• "code_execution_20250825"

• "code_execution_20260120"

• "code_execution_20260521"

• allowed_domains: optional array of string or null

List of domains to allow fetching from

• blocked_domains: optional array of string or null