One change
Create a Message Batch
api/beta/messages/batches/create
Nearest release: v2.1.245, published an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
api/beta/messages/batches/create Changed · +463 / -514 lines
# Create a Message Batch ## Headers ## Body parameters ## Returns ## Example ### Response (200) ## Create a Message Batch ### Header Parameters ### Body Parameters ### Returns ### Example #### Response
The two sides of this change are too far apart to line up, so this is the differ's own diff of it.
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---- -title: Create a Message Batch -url: https://platform.claude.com/docs/en/api/beta/messages/batches/create ---- - -## Create a Message Batch - -**post** `/v1/messages/batches` +# Create a Message Batch + +**POST** `/v1/messages/batches` Send a batch of Message creation requests.
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Learn more about the Message Batches API in our [user guide](https://platform.claude.com/docs/en/build-with-claude/batch-processing) -### Header Parameters +## Headers - `"anthropic-beta": optional array of AnthropicBeta`
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The user profile ID to attribute the requests in this batch to. Use when acting on behalf of a party other than your organization. Requires the `user-profiles` beta header. Applies to every request in the batch; an individual request whose `user_profile_id` body field conflicts with this header is errored. -### Body Parameters - -- `requests: array of object { custom_id, params }` +## Body parameters + +- `requests: array of object` List of requests for prompt completion. Each is an individual request to create a Message. + maxItems: 100000, minItems: 1 + - `custom_id: string` Developer-provided ID created for each request in a Message Batch. Useful for matching results to requests, as results may be given out of request order. Must be unique for each request within the Message Batch. - - `params: object { max_tokens, messages, model, 22 more }` + maxLength: 64, minLength: 1, pattern: ^[a-zA-Z0-9_-]{1,64}$ + + - `params: object` Messages API creation parameters for the individual request.
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Set to `0` to populate the [prompt cache](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#pre-warming-the-cache) without generating a response. Different models have different maximum values for this parameter. See [models](https://platform.claude.com/docs/en/about-claude/models/overview) for details. + + minimum: 0 - `messages: array of BetaMessageParam`
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- `array of BetaContentBlockParam` - - `BetaTextBlockParam object { text, type, cache_control, citations }` + - `BetaTextBlockParam object` - `text: string` + minLength: 1 + - `type: "text"` - - `"text"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - `type: "ephemeral"` - - - `"ephemeral"` - `ttl: optional "5m" or "1h"`
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- `citations: optional array of BetaTextCitationParam or null` - - `BetaCitationCharLocationParam object { cited_text, document_index, document_title, 3 more }` + - `BetaCitationCharLocationParam object` - `cited_text: string` - `document_index: number` + minimum: 0 + - `document_title: string or null` + maxLength: 500, minLength: 1 + - `end_char_index: number` - `start_char_index: number` + minimum: 0 + - `type: "char_location"` - - `"char_location"` - - - `BetaCitationPageLocationParam object { cited_text, document_index, document_title, 3 more }` + - `BetaCitationPageLocationParam object` - `cited_text: string` - `document_index: number` + minimum: 0 + - `document_title: string or null` + maxLength: 500, minLength: 1 + - `end_page_number: number` - `start_page_number: number` + minimum: 1 + - `type: "page_location"` - - `"page_location"` - - - `BetaCitationContentBlockLocationParam object { cited_text, document_index, document_title, 3 more }` + - `BetaCitationContentBlockLocationParam object` - `cited_text: string`
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- `document_index: number` + minimum: 0 + - `document_title: string or null` + maxLength: 500, minLength: 1 + - `end_block_index: number` Exclusive 0-based end index of the cited block range in the source's `content` array.
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0-based index of the first cited block in the source's `content` array. + minimum: 0 + - `type: "content_block_location"` - - `"content_block_location"` - - - `BetaCitationWebSearchResultLocationParam object { cited_text, encrypted_index, title, 2 more }` + - `BetaCitationWebSearchResultLocationParam object` - `cited_text: string`
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- `title: string or null` + maxLength: 512, minLength: 1 + - `type: "web_search_result_location"` - - `"web_search_result_location"` - - `url: string` - - `BetaCitationSearchResultLocationParam object { cited_text, end_block_index, search_result_index, 4 more }` + minLength: 1 + + - `BetaCitationSearchResultLocationParam object` - `cited_text: string`
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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` - `type: "search_result_location"` - - `"search_result_location"` - - - `BetaImageBlockParam object { source, type, cache_control, transformations }` + - `BetaImageBlockParam object` - `source: BetaBase64ImageSource or BetaURLImageSource or BetaFileImageSource` - - `BetaBase64ImageSource object { data, media_type, type }` + - `BetaBase64ImageSource object` - `data: string` + format: byte + - `media_type: "image/jpeg" or "image/png" or "image/gif" or "image/webp"` - `"image/jpeg"`
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- `type: "base64"` - - `"base64"` - - - `BetaURLImageSource object { type, url }` + - `BetaURLImageSource object` - `type: "url"` - - `"url"` - - `url: string` - - `BetaFileImageSource object { file_id, type }` + - `BetaFileImageSource object` - `file_id: string` - `type: "file"` - - `"file"` - - `type: "image"` - - `"image"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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- `"error"` - - `BetaRequestDocumentBlock object { source, type, cache_control, 3 more }` + - `BetaRequestDocumentBlock object` - `source: BetaBase64PDFSource or BetaPlainTextSource or BetaContentBlockSource or 2 more` - - `BetaBase64PDFSource object { data, media_type, type }` + - `BetaBase64PDFSource object` - `data: string` + format: byte + - `media_type: "application/pdf"` - - `"application/pdf"` - - `type: "base64"` - - `"base64"` - - - `BetaPlainTextSource object { data, media_type, type }` + - `BetaPlainTextSource object` - `data: string` - `media_type: "text/plain"` - - `"text/plain"` - - `type: "text"` - - `"text"` - - - `BetaContentBlockSource object { content, type }` + - `BetaContentBlockSource object` - `content: string or array of BetaContentBlockSourceContent`
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- `BetaContentBlockSourceContent = array of BetaContentBlockSourceContent` - - `BetaTextBlockParam object { text, type, cache_control, citations }` - - - `BetaImageBlockParam object { source, type, cache_control, transformations }` + - `BetaTextBlockParam object` + + - `BetaImageBlockParam object` - `type: "content"` - - `"content"` - - - `BetaURLPDFSource object { type, url }` + - `BetaURLPDFSource object` - `type: "url"` - - `"url"` - - `url: string` - - `BetaFileDocumentSource object { file_id, type }` + - `BetaFileDocumentSource object` - `file_id: string` - `type: "file"` - - `"file"` - - `type: "document"` - - `"document"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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- `context: optional string or null` + minLength: 1 + - `title: optional string or null` - - `BetaSearchResultBlockParam object { content, source, title, 3 more }` + maxLength: 500, minLength: 1 + + - `BetaSearchResultBlockParam object` - `content: array of BetaTextBlockParam` - `text: string` + minLength: 1 + - `type: "text"` - `cache_control: optional BetaCacheControlEphemeral or null`
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- `type: "search_result"` - - `"search_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - `citations: optional BetaCitationsConfigParam` - - `BetaThinkingBlockParam object { signature, thinking, type }` + - `BetaThinkingBlockParam object` - `signature: string`
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- `type: "thinking"` - - `"thinking"` - - - `BetaRedactedThinkingBlockParam object { data, type }` + - `BetaRedactedThinkingBlockParam object` - `data: string`
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- `type: "redacted_thinking"` - - `"redacted_thinking"` - - - `BetaToolUseBlockParam object { id, input, name, 4 more }` + - `BetaToolUseBlockParam object` - `id: string` + pattern: ^[a-zA-Z0-9_-]+$ + - `input: map[unknown]` - `name: string` + maxLength: 200, minLength: 1 + - `type: "tool_use"` - - `"tool_use"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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Tool invocation directly from the model. - - `BetaDirectCaller object { type }` + - `BetaDirectCaller object` Tool invocation directly from the model. - `type: "direct"` - - `"direct"` - - - `BetaServerToolCaller object { tool_id, type }` + - `BetaServerToolCaller object` Tool invocation generated by a server-side tool. - `tool_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "code_execution_20250825"` - - `"code_execution_20250825"` - - - `BetaServerToolCaller20260120 object { tool_id, type }` + - `BetaServerToolCaller20260120 object` - `tool_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "code_execution_20260120"` - - `"code_execution_20260120"` - - `toolset_name: optional string or null` For a toolset member tool_use, the toolset family this member belongs to. - - `BetaToolResultBlockParam object { tool_use_id, type, cache_control, 3 more }` + maxLength: 64, minLength: 1, pattern: ^[a-zA-Z0-9_-]+$ + + - `BetaToolResultBlockParam object` - `tool_use_id: string` + pattern: ^[a-zA-Z0-9_-]+$ + - `type: "tool_result"` - - `"tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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- `array of BetaTextBlockParam or BetaImageBlockParam or BetaSearchResultBlockParam or 3 more` - - `BetaTextBlockParam object { text, type, cache_control, citations }` - - - `BetaImageBlockParam object { source, type, cache_control, transformations }` - - - `BetaSearchResultBlockParam object { content, source, title, 3 more }` - - - `BetaRequestDocumentBlock object { source, type, cache_control, 3 more }` - - - `BetaToolReferenceBlockParam object { tool_name, type, cache_control }` + - `BetaTextBlockParam object` + + - `BetaImageBlockParam object` + + - `BetaSearchResultBlockParam object` + + - `BetaRequestDocumentBlock object` + + - `BetaToolReferenceBlockParam object` Tool reference block that can be included in tool_result content. - `tool_name: string` + maxLength: 256, minLength: 1, pattern: ^[a-zA-Z0-9_-]{1,256}$ + - `type: "tool_reference"` - - `"tool_reference"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaBrowserStateBlockParam object { tabs, type, cache_control, state_changes }` + - `BetaBrowserStateBlockParam 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
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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. + maxLength: 4096, minLength: 1, 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`. - `type: "browser_state"` - - `"browser_state"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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Tabs opened and download state changes during this call. "Nothing to report" is expressed by omitting the field, never by an empty list. - - `BetaBrowserStateChangeTabOpened object { tab_id, type }` + maxItems: 200, minItems: 1 + + - `BetaBrowserStateChangeTabOpened 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.
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The `tab_id` of the opened tab, present in `tabs`. + maxLength: 4096, minLength: 1, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$ + - `type: "tab_opened"` - - `"tab_opened"` - - - `BetaBrowserStateChangeDownloadStarted object { download_id, type, url }` + - `BetaBrowserStateChangeDownloadStarted object` A file download that started during this call.
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The caller-assigned identifier for this download, stable across the state changes reporting it. + maxLength: 4096, minLength: 1, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$ + - `type: "download_started"` - - `"download_started"` - - `url: string` The final post-redirect URL the download was served from. - - `BetaBrowserStateChangeDownloadCompleted object { download_id, type, url, 2 more }` + maxLength: 4096, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$ + + - `BetaBrowserStateChangeDownloadCompleted object` A file download that finished during this call, reported with the same `download_id` as its `download_started` — or without a prior
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The caller-assigned identifier for this download, stable across the state changes reporting it. + maxLength: 4096, minLength: 1, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$ + - `type: "download_completed"` - - `"download_completed"` - - `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. + pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$, maxLength: 4096 + - `size_bytes: optional number or null` The completed download's size. - - `BetaBrowserStateChangeDownloadFailed object { download_id, type, url, error }` + minimum: 0 + + - `BetaBrowserStateChangeDownloadFailed object` A file download that failed — or was cancelled — during this call.
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The caller-assigned identifier for this download, stable across the state changes reporting it. + maxLength: 4096, minLength: 1, pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$ + - `type: "download_failed"` - - `"download_failed"` - - `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. + pattern: ^[^\x00-\x1f\x7f-\x9f\u2028\u2029]*$, maxLength: 4096 + - `is_error: optional boolean` - `toolset_name: optional string or null` For a toolset member tool_result, the toolset family of the paired tool_use. - - `BetaServerToolUseBlockParam object { id, input, name, 3 more }` + maxLength: 64, minLength: 1, pattern: ^[a-zA-Z0-9_-]+$ + + - `BetaServerToolUseBlockParam object` - `id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `input: map[unknown]` - `name: "advisor" or "web_search" or "web_fetch" or 5 more`
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- `type: "server_tool_use"` - - `"server_tool_use"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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Tool invocation directly from the model. - - `BetaDirectCaller object { type }` + - `BetaDirectCaller object` Tool invocation directly from the model. - - `BetaServerToolCaller object { tool_id, type }` + - `BetaServerToolCaller object` Tool invocation generated by a server-side tool. - - `BetaServerToolCaller20260120 object { tool_id, type }` - - - `BetaWebSearchToolResultBlockParam object { content, tool_use_id, type, 2 more }` + - `BetaServerToolCaller20260120 object` + + - `BetaWebSearchToolResultBlockParam object` - `content: BetaWebSearchToolResultBlockParamContent`
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- `type: "web_search_result"` - - `"web_search_result"` - - `url: string` - `page_age: optional string or null` - - `BetaWebSearchToolRequestError object { error_code, type }` + - `BetaWebSearchToolRequestError object` - `error_code: BetaWebSearchToolResultErrorCode`
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- `type: "web_search_tool_result_error"` - - `"web_search_tool_result_error"` - - `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "web_search_tool_result"` - - `"web_search_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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Tool invocation directly from the model. - - `BetaDirectCaller object { type }` + - `BetaDirectCaller object` Tool invocation directly from the model. - - `BetaServerToolCaller object { tool_id, type }` + - `BetaServerToolCaller object` Tool invocation generated by a server-side tool. - - `BetaServerToolCaller20260120 object { tool_id, type }` - - - `BetaWebFetchToolResultBlockParam object { content, tool_use_id, type, 2 more }` + - `BetaServerToolCaller20260120 object` + + - `BetaWebFetchToolResultBlockParam object` - `content: BetaWebFetchToolResultErrorBlockParam or BetaWebFetchBlockParam` - - `BetaWebFetchToolResultErrorBlockParam object { error_code, type }` + - `BetaWebFetchToolResultErrorBlockParam object` - `error_code: BetaWebFetchToolResultErrorCode`
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- `type: "web_fetch_tool_result_error"` - - `"web_fetch_tool_result_error"` - - - `BetaWebFetchBlockParam object { content, type, url, retrieved_at }` + - `BetaWebFetchBlockParam object` - `content: BetaRequestDocumentBlock` - `type: "web_fetch_result"` - - `"web_fetch_result"` - - `url: string` Fetched content URL
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- `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "web_fetch_tool_result"` - - `"web_fetch_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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Tool invocation directly from the model. - - `BetaDirectCaller object { type }` + - `BetaDirectCaller object` Tool invocation directly from the model. - - `BetaServerToolCaller object { tool_id, type }` + - `BetaServerToolCaller object` Tool invocation generated by a server-side tool. - - `BetaServerToolCaller20260120 object { tool_id, type }` - - - `BetaAdvisorToolResultBlockParam object { content, tool_use_id, type, cache_control }` + - `BetaServerToolCaller20260120 object` + + - `BetaAdvisorToolResultBlockParam object` - `content: BetaAdvisorToolResultErrorParam or BetaAdvisorResultBlockParam or BetaAdvisorRedactedResultBlockParam` - - `BetaAdvisorToolResultErrorParam object { error_code, type }` + - `BetaAdvisorToolResultErrorParam object` - `error_code: "max_uses_exceeded" or "prompt_too_long" or "too_many_requests" or 4 more`
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- `type: "advisor_tool_result_error"` - - `"advisor_tool_result_error"` - - - `BetaAdvisorResultBlockParam object { text, type, stop_reason }` + - `BetaAdvisorResultBlockParam object` - `text: string` - `type: "advisor_result"` - - `"advisor_result"` - - `stop_reason: optional string or null` - - `BetaAdvisorRedactedResultBlockParam object { encrypted_content, type, stop_reason }` + - `BetaAdvisorRedactedResultBlockParam object` - `encrypted_content: string`
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- `type: "advisor_redacted_result"` - - `"advisor_redacted_result"` - - `stop_reason: optional string or null` - `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "advisor_tool_result"` - - `"advisor_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaCodeExecutionToolResultBlockParam object { content, tool_use_id, type, cache_control }` + - `BetaCodeExecutionToolResultBlockParam object` - `content: BetaCodeExecutionToolResultBlockParamContent` Code execution result with encrypted stdout for PFC + web_search results. - - `BetaCodeExecutionToolResultErrorParam object { error_code, type }` + - `BetaCodeExecutionToolResultErrorParam object` - `error_code: BetaCodeExecutionToolResultErrorCode`
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- `type: "code_execution_tool_result_error"` - - `"code_execution_tool_result_error"` - - - `BetaCodeExecutionResultBlockParam object { content, return_code, stderr, 2 more }` + - `BetaCodeExecutionResultBlockParam object` - `content: array of BetaCodeExecutionOutputBlockParam`
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- `type: "code_execution_output"` - - `"code_execution_output"` - - `return_code: number` - `stderr: string`
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- `type: "code_execution_result"` - - `"code_execution_result"` - - - `BetaEncryptedCodeExecutionResultBlockParam object { content, encrypted_stdout, return_code, 2 more }` + - `BetaEncryptedCodeExecutionResultBlockParam object` Code execution result with encrypted stdout for PFC + web_search results.
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- `type: "encrypted_code_execution_result"` - - `"encrypted_code_execution_result"` - - `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "code_execution_tool_result"` - - `"code_execution_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaBashCodeExecutionToolResultBlockParam object { content, tool_use_id, type, cache_control }` + - `BetaBashCodeExecutionToolResultBlockParam object` - `content: BetaBashCodeExecutionToolResultErrorParam or BetaBashCodeExecutionResultBlockParam` - - `BetaBashCodeExecutionToolResultErrorParam object { error_code, type }` + - `BetaBashCodeExecutionToolResultErrorParam object` - `error_code: "invalid_tool_input" or "unavailable" or "too_many_requests" or 2 more`
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- `type: "bash_code_execution_tool_result_error"` - - `"bash_code_execution_tool_result_error"` - - - `BetaBashCodeExecutionResultBlockParam object { content, return_code, stderr, 2 more }` + - `BetaBashCodeExecutionResultBlockParam object` - `content: array of BetaBashCodeExecutionOutputBlockParam`
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- `type: "bash_code_execution_output"` - - `"bash_code_execution_output"` - - `return_code: number` - `stderr: string`
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- `type: "bash_code_execution_result"` - - `"bash_code_execution_result"` - - `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "bash_code_execution_tool_result"` - - `"bash_code_execution_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaTextEditorCodeExecutionToolResultBlockParam object { content, tool_use_id, type, cache_control }` + - `BetaTextEditorCodeExecutionToolResultBlockParam object` - `content: BetaTextEditorCodeExecutionToolResultErrorParam or BetaTextEditorCodeExecutionViewResultBlockParam or BetaTextEditorCodeExecutionCreateResultBlockParam or BetaTextEditorCodeExecutionStrReplaceResultBlockParam` - - `BetaTextEditorCodeExecutionToolResultErrorParam object { error_code, type, error_message }` + - `BetaTextEditorCodeExecutionToolResultErrorParam object` - `error_code: "invalid_tool_input" or "unavailable" or "too_many_requests" or 2 more`
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- `type: "text_editor_code_execution_tool_result_error"` - - `"text_editor_code_execution_tool_result_error"` - - `error_message: optional string or null` - - `BetaTextEditorCodeExecutionViewResultBlockParam object { content, file_type, type, 3 more }` + - `BetaTextEditorCodeExecutionViewResultBlockParam object` - `content: string`
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- `type: "text_editor_code_execution_view_result"` - - `"text_editor_code_execution_view_result"` - - `num_lines: optional number or null` - `start_line: optional number or null` - `total_lines: optional number or null` - - `BetaTextEditorCodeExecutionCreateResultBlockParam object { is_file_update, type }` + - `BetaTextEditorCodeExecutionCreateResultBlockParam object` - `is_file_update: boolean` - `type: "text_editor_code_execution_create_result"` - - `"text_editor_code_execution_create_result"` - - - `BetaTextEditorCodeExecutionStrReplaceResultBlockParam object { type, lines, new_lines, 3 more }` + - `BetaTextEditorCodeExecutionStrReplaceResultBlockParam object` - `type: "text_editor_code_execution_str_replace_result"` - - `"text_editor_code_execution_str_replace_result"` - - `lines: optional array of string or null` - `new_lines: optional number or null`
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- `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "text_editor_code_execution_tool_result"` - - `"text_editor_code_execution_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaToolSearchToolResultBlockParam object { content, tool_use_id, type, cache_control }` + - `BetaToolSearchToolResultBlockParam object` - `content: BetaToolSearchToolResultErrorParam or BetaToolSearchToolSearchResultBlockParam` - - `BetaToolSearchToolResultErrorParam object { error_code, type, error_message }` + - `BetaToolSearchToolResultErrorParam object` - `error_code: "invalid_tool_input" or "unavailable" or "too_many_requests" or "execution_time_exceeded"`
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- `type: "tool_search_tool_result_error"` - - `"tool_search_tool_result_error"` - - `error_message: optional string or null` - - `BetaToolSearchToolSearchResultBlockParam object { tool_references, type }` + - `BetaToolSearchToolSearchResultBlockParam object` - `tool_references: array of BetaToolReferenceBlockParam` - `tool_name: string` + maxLength: 256, minLength: 1, pattern: ^[a-zA-Z0-9_-]{1,256}$ + - `type: "tool_reference"` - `cache_control: optional BetaCacheControlEphemeral or null`
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- `type: "tool_search_tool_search_result"` - - `"tool_search_tool_search_result"` - - `tool_use_id: string` + pattern: ^srvtoolu_[a-zA-Z0-9_]+$ + - `type: "tool_search_tool_result"` - - `"tool_search_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaMCPToolUseBlockParam object { id, input, name, 3 more }` + - `BetaMCPToolUseBlockParam object` - `id: string` + pattern: ^[a-zA-Z0-9_-]+$ + - `input: map[unknown]` - `name: string`
from line 1209
- `type: "mcp_tool_use"` - - `"mcp_tool_use"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaRequestMCPToolResultBlockParam object { tool_use_id, type, cache_control, 2 more }` + - `BetaRequestMCPToolResultBlockParam object` - `tool_use_id: string` + pattern: ^[a-zA-Z0-9_-]+$ + - `type: "mcp_tool_result"` - - `"mcp_tool_result"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
from line 1233
- `text: string` + minLength: 1 + - `type: "text"` - `cache_control: optional BetaCacheControlEphemeral or null`
from line 1245
- `is_error: optional boolean` - - `BetaContainerUploadBlockParam object { file_id, type, cache_control }` + - `BetaContainerUploadBlockParam 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.
from line 1254
- `type: "container_upload"` - - `"container_upload"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaCompactionBlockParam object { type, cache_control, content, encrypted_content }` + - `BetaCompactionBlockParam object` A compaction block containing summary of previous context.
from line 1270
- `type: "compaction"` - - `"compaction"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
from line 1282
Opaque metadata from prior compaction, to be round-tripped verbatim - - `BetaRequestToolAdditionBlock object { tool, type, cache_control }` + - `BetaRequestToolAdditionBlock object` Mid-conversation directive to surface a declared tool.
from line 1297
server assigns to MCP-resolved tools — use `mcp_tool_reference` or `mcp_toolset_reference` for those. - - `BetaToolChangeToolReference object { name, type }` + - `BetaToolChangeToolReference object` Reference to a single tool the caller declared directly in `tools[]`. Does not accept the composed `{server}_{name}` form the
from line 1306
- `name: string` + pattern: ^[a-zA-Z0-9_-]{1,128}$ + - `type: "tool_reference"` - - `"tool_reference"` - - - `BetaToolChangeMCPToolReference object { name, server_name, type }` + - `BetaToolChangeMCPToolReference object` Reference to a single MCP tool by its server and remote name — the same `server_name`/`name` pair `mcp_tool_use` carries.
from line 1321
- `type: "mcp_tool_reference"` - - `"mcp_tool_reference"` - - - `BetaToolChangeMCPToolsetReference object { server_name, type }` + - `BetaToolChangeMCPToolsetReference object` Reference to every tool in the named MCP server's toolset.
from line 1329
- `type: "mcp_toolset_reference"` - - `"mcp_toolset_reference"` - - `type: "tool_addition"` - - `"tool_addition"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaRequestToolRemovalBlock object { tool, type, cache_control }` + - `BetaRequestToolRemovalBlock object` Mid-conversation directive to withdraw a tool.
from line 1350
server assigns to MCP-resolved tools — use `mcp_tool_reference` or `mcp_toolset_reference` for those. - - `BetaToolChangeToolReference object { name, type }` + - `BetaToolChangeToolReference object` Reference to a single tool the caller declared directly in `tools[]`. Does not accept the composed `{server}_{name}` form the server assigns to MCP-resolved tools — use `mcp_tool_reference` or `mcp_toolset_reference` for those. - - `BetaToolChangeMCPToolReference object { name, server_name, type }` + - `BetaToolChangeMCPToolReference object` Reference to a single MCP tool by its server and remote name — the same `server_name`/`name` pair `mcp_tool_use` carries. - - `BetaToolChangeMCPToolsetReference object { server_name, type }` + - `BetaToolChangeMCPToolsetReference object` Reference to every tool in the named MCP server's toolset. - `type: "tool_removal"` - - `"tool_removal"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block. - - `BetaFallbackBlockParam object { from, to, type, trigger }` + - `BetaFallbackBlockParam object` A `fallback` block echoed back from a prior response.
from line 1472
- `type: "fallback"` - - `"fallback"` - - `trigger: optional unknown` The response block's `trigger`, echoed verbatim. Accepted and ignored by the server; any object or `null` is allowed.
from line 1498
Container identifier for reuse across requests. - - `BetaContainerParams object { id, skills }` + - `BetaContainerParams object` Container parameters with skills to be loaded.
from line 1510
List of skills to load in the container + maxItems: 20 + - `skill_id: string` Skill ID + maxLength: 64, minLength: 1 + - `type: "anthropic" or "custom"` Type of skill - either 'anthropic' (built-in) or 'custom' (user-defined)
from line 1530
Skill version or 'latest' for most recent version + maxLength: 64, minLength: 1 + - `string` - `context_management: optional BetaContextManagementConfig or null`
from line 1544
List of context management edits to apply - - `BetaClearToolUses20250919Edit object { type, clear_at_least, clear_tool_inputs, 3 more }` + minItems: 0 + + - `BetaClearToolUses20250919Edit object` - `type: "clear_tool_uses_20250919"` - - `"clear_tool_uses_20250919"` - - `clear_at_least: optional BetaInputTokensClearAtLeast or null` Minimum number of tokens that must be cleared when triggered. Context will only be modified if at least this many tokens can be removed. - `type: "input_tokens"` - - `"input_tokens"` - - `value: number` + minimum: 0 + - `clear_tool_inputs: optional boolean or array of string or null` Whether to clear all tool inputs (bool) or specific tool inputs to clear (list)
from line 1578
- `type: "tool_uses"` - - `"tool_uses"` - - `value: number` + minimum: 0 + - `trigger: optional BetaInputTokensTrigger or BetaToolUsesTrigger` Condition that triggers the context management strategy - - `BetaInputTokensTrigger object { type, value }` + - `BetaInputTokensTrigger object` - `type: "input_tokens"` - - `"input_tokens"` - - `value: number` - - `BetaToolUsesTrigger object { type, value }` + minimum: 1 + + - `BetaToolUsesTrigger object` - `type: "tool_uses"` - - `"tool_uses"` - - `value: number` - - `BetaClearThinking20251015Edit object { type, keep }` + minimum: 1 + + - `BetaClearThinking20251015Edit object` - `type: "clear_thinking_20251015"` - - `"clear_thinking_20251015"` - - `keep: optional BetaThinkingTurns or BetaAllThinkingTurns or "all"` Number of most recent assistant turns to keep thinking blocks for. Older turns will have their thinking blocks removed. - - `BetaThinkingTurns object { type, value }` + - `BetaThinkingTurns object` - `type: "thinking_turns"` - - `"thinking_turns"` - - `value: number` - - `BetaAllThinkingTurns object { type }` + minimum: 1 + + - `BetaAllThinkingTurns object` - `type: "all"` - - `"all"` - - `"all"` - - `"all"` - - - `BetaCompact20260112Edit object { type, instructions, pause_after_compaction, trigger }` + - `BetaCompact20260112Edit object` Automatically compact older context when reaching the configured trigger threshold. - `type: "compact_20260112"` - - - `"compact_20260112"` - `instructions: optional string or null`
from line 1650
- `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 - `fallback_credit_token: optional string or BetaFallbackCreditTokenParam or null`
from line 1678
- `string` - - `BetaFallbackCreditTokenParam object { token, mode }` + - `BetaFallbackCreditTokenParam object` Object form of `fallback_credit_token`: the token plus a redemption mode.
from line 1692
The opaque `fallback_credit_token` from a prior refusal's `stop_details` — the same string the bare-string form carries. + maxLength: 2048, minLength: 1 + - `mode: optional "strict" or "best_effort"` How a failing token affects the retry. `strict` (the default, and the bare-string behavior): a failing redemption is a 400 and the retry is not served. `best_effort`: the retry is served either way — a token-layer failure no longer rejects the request; the retry proceeds at normal price and the outcome is reported on the response's `usage.fallback_credit`. Two failures stay hard in both modes: a malformed token, and combining `fallback_credit_token` with `fallbacks`.
from line 1742
- `type: "json_schema"` - - `"json_schema"` - - `task_budget: optional BetaTokenTaskBudget or null` User-configurable total token budget across contexts.
from line 1750
Total token budget across all contexts in the session. + minimum: 1024 + - `type: "tokens"` The budget type. Currently only 'tokens' is supported. - - `"tokens"` - - `remaining: optional number or null` Remaining tokens in the budget. Use this to track usage across contexts when implementing compaction client-side. Defaults to total if not provided. + minimum: 0 + - `speed: optional "standard" or "fast" or null` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time.
from line 1772
- `thinking: optional BetaThinkingConfigEnabled or BetaThinkingConfigDisabled or BetaThinkingConfigAdaptive or null` - - `BetaThinkingConfigEnabled object { budget_tokens, type, display }` + - `BetaThinkingConfigEnabled object` - `budget_tokens: number`
from line 1782
See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) for details. + minimum: 1024 + - `type: "enabled"` - - `"enabled"` - - `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`.
from line 1794
- `"omitted"` - - `BetaThinkingConfigDisabled object { type }` + - `BetaThinkingConfigDisabled object` - `type: "disabled"` - - `"disabled"` - - - `BetaThinkingConfigAdaptive object { type, display }` + - `BetaThinkingConfigAdaptive object` - `type: "adaptive"` - - `"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`.
from line 1812
- `Default = "default"` - - `"default"` - - `inference_geo: optional string or null` Specifies the geographic region for inference processing. If not specified, the workspace's `default_inference_geo` is used.
from line 1820
MCP servers to be utilized in this request + maxItems: 20 + - `name: string` - `type: "url"` - - `"url"` - - `url: string` - `authorization_token: optional string or null`
from line 1846
This should be a uuid, hash value, or other opaque identifier. Anthropic 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 BetaOutputConfig` Configuration options for the model's output, such as the output format. - - `output_format: optional BetaJSONOutputFormat or null` - - Deprecated: Use `output_config.format` instead. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) - - A schema to specify Claude's output format in responses. This parameter will be removed in a future release. - - `service_tier: optional "auto" or "standard_only"` Determines whether to use priority capacity (if available) or standard capacity for this request.
from line 1896
- `text: string` + minLength: 1 + - `type: "text"` - `cache_control: optional BetaCacheControlEphemeral or null`
from line 1906
- `citations: optional array of BetaTextCitationParam or null` - - `temperature: optional number` - - Amount of randomness injected into the response. - - Defaults to `1.0`. Ranges from `0.0` to `1.0`. Use `temperature` closer to `0.0` for analytical / multiple choice, and closer to `1.0` for creative and generative tasks. - - Note that even with `temperature` of `0.0`, the results will not be fully deterministic. - - `thinking: optional BetaThinkingConfigParam` Configuration for enabling Claude's extended thinking.
from line 1914
See [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) for details. - - `BetaThinkingConfigEnabled object { budget_tokens, type, display }` - - - `BetaThinkingConfigDisabled object { type }` - - - `BetaThinkingConfigAdaptive object { type, display }` + - `BetaThinkingConfigEnabled object` + + - `BetaThinkingConfigDisabled object` + + - `BetaThinkingConfigAdaptive object` - `tool_choice: optional BetaToolChoice` 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. - - `BetaToolChoiceAuto object { type, disable_parallel_tool_use }` + - `BetaToolChoiceAuto object` The model will automatically decide whether to use tools. - `type: "auto"` - - `"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. - - `BetaToolChoiceAny object { type, disable_parallel_tool_use }` + - `BetaToolChoiceAny object` The model will use any available tools. - `type: "any"` - - `"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. - - `BetaToolChoiceTool object { name, type, disable_parallel_tool_use }` + - `BetaToolChoiceTool object` The model will use the specified tool with `tool_choice.name`.
from line 1958
- `type: "tool"` - - `"tool"` - - `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. - - `BetaToolChoiceNone object { type }` + - `BetaToolChoiceNone object` The model will not be allowed to use tools. - `type: "none"` - - - `"none"` - `tools: optional array of BetaToolUnion`
from line 2034
See our [guide](https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview) for more details. - - `BetaTool object { input_schema, name, allowed_callers, 7 more }` - - - `input_schema: object { type, properties, required }` + - `BetaTool object` + + - `input_schema: object` [JSON schema](https://json-schema.org/draft/2020-12) for this tool's input.
from line 2044
- `type: "object"` - - `"object"` - - `properties: optional map[unknown] or null` - `required: optional array of string or null`
from line 2054
This is how the tool will be called by the model and in `tool_use` blocks. + maxLength: 128, minLength: 1, 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"`
from line 2092
- `type: optional "custom" or null` - - `"custom"` - - - `BetaToolBash20241022 object { name, type, allowed_callers, 4 more }` + - `BetaToolBash20241022 object` - `name: "bash"`
from line 2100
This is how the tool will be called by the model and in `tool_use` blocks. - - `"bash"` - - `type: "bash_20241022"` - - `"bash_20241022"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2126
When true, guarantees schema validation on tool names and inputs - - `BetaToolBash20250124 object { name, type, allowed_callers, 4 more }` + - `BetaToolBash20250124 object` - `name: "bash"`
from line 2134
This is how the tool will be called by the model and in `tool_use` blocks. - - `"bash"` - - `type: "bash_20250124"` - - `"bash_20250124"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2160
When true, guarantees schema validation on tool names and inputs - - `BetaCodeExecutionTool20250522 object { name, type, allowed_callers, 3 more }` + - `BetaCodeExecutionTool20250522 object` - `name: "code_execution"`
from line 2168
This is how the tool will be called by the model and in `tool_use` blocks. - - `"code_execution"` - - `type: "code_execution_20250522"` - - `"code_execution_20250522"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2192
When true, guarantees schema validation on tool names and inputs - - `BetaCodeExecutionTool20250825 object { name, type, allowed_callers, 3 more }` + - `BetaCodeExecutionTool20250825 object` - `name: "code_execution"`
from line 2200
This is how the tool will be called by the model and in `tool_use` blocks. - - `"code_execution"` - - `type: "code_execution_20250825"` + - `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 BetaCacheControlEphemeral 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 + + - `BetaCodeExecutionTool20260120 object` + + Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint). + + - `name: "code_execution"` + + Name of the tool. + + This is how the tool will be called by the model and in `tool_use` blocks. + + - `type: "code_execution_20260120"` + - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2258
When true, guarantees schema validation on tool names and inputs - - `BetaCodeExecutionTool20260120 object { name, type, allowed_callers, 3 more }` - - Code execution tool with REPL state persistence (daemon mode + gVisor checkpoint). + - `BetaCodeExecutionTool20260521 object` + + Code execution tool with REPL state persistence. - `name: "code_execution"`
from line 2268
This is how the tool will be called by the model and in `tool_use` blocks. - - `"code_execution"` - - - `type: "code_execution_20260120"` + - `type: "code_execution_20260521"` + + - `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"` - - `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 BetaCacheControlEphemeral or null`
from line 2292
When true, guarantees schema validation on tool names and inputs - - `BetaCodeExecutionTool20260521 object { name, type, allowed_callers, 3 more }` - - Code execution tool with REPL state persistence. - - - `name: "code_execution"` - - Name of the tool. - - This is how the tool will be called by the model and in `tool_use` blocks. - - - `"code_execution"` - - - `type: "code_execution_20260521"` - - - `"code_execution_20260521"` - - - `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 BetaCacheControlEphemeral 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 - - - `BetaBrowserToolset20260801 object { type, allowed_callers, cache_control, configs }` + - `BetaBrowserToolset20260801 object` The browser toolset: a single `tools[]` entry (carrying no `name`) that declares the browser tool family. The model is served
from line 2300
from its schema. - `type: "browser_toolset_20260801"` - - - `"browser_toolset_20260801"` - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"`
from line 2696
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. - - `BetaToolComputerUse20241022 object { display_height_px, display_width_px, name, 7 more }` + - `BetaToolComputerUse20241022 object` - `display_height_px: number` The height of the display in pixels. + minimum: 1 + - `display_width_px: number` The width of the display in pixels. + minimum: 1 + - `name: "computer"` Name of the tool. This is how the tool will be called by the model and in `tool_use` blocks. - - `"computer"` - - `type: "computer_20241022"` - - `"computer_20241022"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2740
The X11 display number (e.g. 0, 1) for the display. + minimum: 0 + - `input_examples: optional array of map[unknown]` - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs - - `BetaMemoryTool20250818 object { name, type, allowed_callers, 4 more }` + - `BetaMemoryTool20250818 object` - `name: "memory"`
from line 2756
This is how the tool will be called by the model and in `tool_use` blocks. - - `"memory"` - - `type: "memory_20250818"` - - `"memory_20250818"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2782
When true, guarantees schema validation on tool names and inputs - - `BetaToolComputerUse20250124 object { display_height_px, display_width_px, name, 7 more }` + - `BetaToolComputerUse20250124 object` - `display_height_px: number` The height of the display in pixels. + minimum: 1 + - `display_width_px: number` The width of the display in pixels. + minimum: 1 + - `name: "computer"` Name of the tool. This is how the tool will be called by the model and in `tool_use` blocks. - - `"computer"` - - `type: "computer_20250124"` - - `"computer_20250124"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2826
The X11 display number (e.g. 0, 1) for the display. + minimum: 0 + - `input_examples: optional array of map[unknown]` - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs - - `BetaToolTextEditor20241022 object { name, type, allowed_callers, 4 more }` + - `BetaToolTextEditor20241022 object` - `name: "str_replace_editor"`
from line 2842
This is how the tool will be called by the model and in `tool_use` blocks. - - `"str_replace_editor"` - - `type: "text_editor_20241022"` - - `"text_editor_20241022"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2868
When true, guarantees schema validation on tool names and inputs - - `BetaToolComputerUse20251124 object { display_height_px, display_width_px, name, 8 more }` + - `BetaToolComputerUse20251124 object` - `display_height_px: number` The height of the display in pixels. + minimum: 1 + - `display_width_px: number` The width of the display in pixels. + minimum: 1 + - `name: "computer"` Name of the tool. This is how the tool will be called by the model and in `tool_use` blocks. - - `"computer"` - - `type: "computer_20251124"` - - `"computer_20251124"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 2912
The X11 display number (e.g. 0, 1) for the display. + minimum: 0 + - `enable_zoom: optional boolean` Whether to enable an action to take a zoomed-in screenshot of the screen.
from line 2924
When true, guarantees schema validation on tool names and inputs - - `BetaComputerToolset20260801 object { type, allowed_callers, cache_control, configs }` + - `BetaComputerToolset20260801 object` The computer toolset: a single `tools[]` entry (carrying no `name`) that declares the computer tool family. The model is
from line 2937
- `type: "computer_toolset_20260801"` - - `"computer_toolset_20260801"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
from line 3164
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. - - `BetaToolTextEditor20250124 object { name, type, allowed_callers, 4 more }` + - `BetaToolTextEditor20250124 object` - `name: "str_replace_editor"`
from line 3172
This is how the tool will be called by the model and in `tool_use` blocks. - - `"str_replace_editor"` - - `type: "text_editor_20250124"` - - `"text_editor_20250124"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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When true, guarantees schema validation on tool names and inputs - - `BetaToolTextEditor20250429 object { name, type, allowed_callers, 4 more }` + - `BetaToolTextEditor20250429 object` - `name: "str_replace_based_edit_tool"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"str_replace_based_edit_tool"` - - `type: "text_editor_20250429"` - - `"text_editor_20250429"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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When true, guarantees schema validation on tool names and inputs - - `BetaToolTextEditor20250728 object { name, type, allowed_callers, 5 more }` + - `BetaToolTextEditor20250728 object` - `name: "str_replace_based_edit_tool"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"str_replace_based_edit_tool"` - - `type: "text_editor_20250728"` - - `"text_editor_20250728"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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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 - - `BetaWebSearchTool20250305 object { name, type, allowed_callers, 7 more }` + - `BetaWebSearchTool20250305 object` - `name: "web_search"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_search"` - - `type: "web_search_20250305"` - - `"web_search_20250305"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs
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- `type: "approximate"` - - `"approximate"` - - `city: optional string or null` The city of the user. + maxLength: 255, minLength: 1 + - `country: optional string or null` The two letter [ISO country code](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) of the user. + maxLength: 2, minLength: 2 + - `region: optional string or null` The region of the user. + maxLength: 255, minLength: 1 + - `timezone: optional string or null` The [IANA timezone](https://nodatime.org/TimeZones) of the user. - - `BetaWebFetchTool20250910 object { name, type, allowed_callers, 8 more }` + maxLength: 255, minLength: 1 + + - `BetaWebFetchTool20250910 object` - `name: "web_fetch"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_fetch"` - - `type: "web_fetch_20250910"` - - `"web_fetch_20250910"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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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. + exclusiveMinimum: 0 + - `max_uses: optional number or null` Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs - - `BetaWebSearchTool20260209 object { name, type, allowed_callers, 7 more }` + - `BetaWebSearchTool20260209 object` - `name: "web_search"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_search"` - - `type: "web_search_20260209"` - - `"web_search_20260209"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs
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Parameters for the user's location. Used to provide more relevant search results. - - `BetaWebFetchTool20260209 object { name, type, allowed_callers, 8 more }` + - `BetaWebFetchTool20260209 object` - `name: "web_fetch"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_fetch"` - - `type: "web_fetch_20260209"` - - `"web_fetch_20260209"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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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. + exclusiveMinimum: 0 + - `max_uses: optional number or null` Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs - - `BetaWebFetchTool20260309 object { name, type, allowed_callers, 9 more }` + - `BetaWebFetchTool20260309 object` Web fetch tool with use_cache parameter for bypassing cached content.
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_fetch"` - - `type: "web_fetch_20260309"` - - `"web_fetch_20260309"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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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. + exclusiveMinimum: 0 + - `max_uses: optional number or null` Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs
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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. - - `BetaWebSearchTool20260318 object { name, type, allowed_callers, 8 more }` + - `BetaWebSearchTool20260318 object` - `name: "web_search"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_search"` - - `type: "web_search_20260318"` - - `"web_search_20260318"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `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.
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Parameters for the user's location. Used to provide more relevant search results. - - `BetaWebFetchTool20260318 object { name, type, allowed_callers, 10 more }` + - `BetaWebFetchTool20260318 object` - `name: "web_fetch"`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"web_fetch"` - - `type: "web_fetch_20260318"` - - `"web_fetch_20260318"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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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. + exclusiveMinimum: 0 + - `max_uses: optional number or null` Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `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.
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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. - - `BetaAdvisorTool20260301 object { model, name, type, 7 more }` + - `BetaAdvisorTool20260301 object` - `model: Model`
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This is how the tool will be called by the model and in `tool_use` blocks. - - `"advisor"` - - `type: "advisor_20260301"` - - `"advisor_20260301"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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Bounds the advisor's total output (thinking + text) per call. When the advisor hits this cap, the returned advisor_result or advisor_redacted_result block carries stop_reason='max_tokens', and a truncation note is appended to the advice text the worker model sees (inside the encrypted blob in redacted mode). When set, the server also emits a remaining-tokens budget block in the advisor's prompt so the advisor self-shapes toward the cap. When omitted, the advisor model's default output cap applies and no budget block is emitted. + minimum: 1024 + - `max_uses: optional number or null` Maximum number of times the tool can be used in the API request. + exclusiveMinimum: 0 + - `strict: optional boolean` When true, guarantees schema validation on tool names and inputs - - `BetaToolSearchToolBm25_20251119 object { name, type, allowed_callers, 3 more }` + - `BetaToolSearchToolBm25_20251119 object` - `name: "tool_search_tool_bm25"`
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This is how the tool will be called by the model and in `tool_use` blocks. + - `type: "tool_search_tool_bm25_20251119" or "tool_search_tool_bm25"` + + - `"tool_search_tool_bm25_20251119"` + - `"tool_search_tool_bm25"` - - `type: "tool_search_tool_bm25_20251119" or "tool_search_tool_bm25"` - - - `"tool_search_tool_bm25_20251119"` - - - `"tool_search_tool_bm25"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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When true, guarantees schema validation on tool names and inputs - - `BetaToolSearchToolRegex20251119 object { name, type, allowed_callers, 3 more }` + - `BetaToolSearchToolRegex20251119 object` - `name: "tool_search_tool_regex"`
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This is how the tool will be called by the model and in `tool_use` blocks. + - `type: "tool_search_tool_regex_20251119" or "tool_search_tool_regex"` + + - `"tool_search_tool_regex_20251119"` + - `"tool_search_tool_regex"` - - `type: "tool_search_tool_regex_20251119" or "tool_search_tool_regex"` - - - `"tool_search_tool_regex_20251119"` - - - `"tool_search_tool_regex"` - - `allowed_callers: optional array of "direct" or "code_execution_20250825" or "code_execution_20260120" or "code_execution_20260521"` - `"direct"`
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When true, guarantees schema validation on tool names and inputs - - `BetaMCPToolset object { mcp_server_name, type, cache_control, 2 more }` + - `BetaMCPToolset object` Configuration for a group of tools from an MCP server.
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Name of the MCP server to configure tools for + maxLength: 255, minLength: 1 + - `type: "mcp_toolset"` - - `"mcp_toolset"` - - `cache_control: optional BetaCacheControlEphemeral or null` Create a cache control breakpoint at this content block.
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- `enabled: optional boolean` + - `output_format: optional BetaJSONOutputFormat or null` + + **Deprecated** + + Deprecated: Use `output_config.format` instead. See [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) + + A schema to specify Claude's output format in responses. This parameter will be removed in a future release. + + - `temperature: optional number` + + **Deprecated**: Deprecated. Models released after Claude Opus 4.6 do not support setting temperature. A value of 1.0 of 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. + + maximum: 1, minimum: 0 + - `top_k: optional number` + **Deprecated**: Deprecated. Models released after Claude 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](https://towardsdatascience.com/how-to-sample-from-language-models-682bceb97277). Recommended for advanced use cases only. + minimum: 0 + - `top_p: optional number` + **Deprecated**: Deprecated. Models released after Claude 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. -### Returns - -- `BetaMessageBatch object { id, archived_at, cancel_initiated_at, 7 more }` + maximum: 1, minimum: 0 + +## Returns + +- `BetaMessageBatch object` - `id: string`
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RFC 3339 datetime string representing the time at which the Message Batch was archived and its results became unavailable. + format: date-time + - `cancel_initiated_at: string or null` RFC 3339 datetime string representing the time at which cancellation was initiated for the Message Batch. Specified only if cancellation was initiated. + format: date-time + - `created_at: string` RFC 3339 datetime string representing the time at which the Message Batch was created. + format: date-time + - `ended_at: string or null` RFC 3339 datetime string representing the time at which processing for the Message Batch ended. Specified only once processing ends. Processing ends when every request in a Message Batch has either succeeded, errored, canceled, or expired. + format: date-time + - `expires_at: string` RFC 3339 datetime string representing the time at which the Message Batch will expire and end processing, which is 24 hours after creation. + format: date-time + - `processing_status: "in_progress" or "canceling" or "ended"` Processing status of the Message Batch.
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This is zero until processing of the entire Message Batch has ended. + default: 0 + - `errored: number` Number of requests in the Message Batch that encountered an error. This is zero until processing of the entire Message Batch has ended. + default: 0 + - `expired: number` Number of requests in the Message Batch that have expired. This is zero until processing of the entire Message Batch has ended. + default: 0 + - `processing: number` Number of requests in the Message Batch that are processing. + default: 0 + - `succeeded: number` Number of requests in the Message Batch that have completed successfully. This is zero until processing of the entire Message Batch has ended. + default: 0 + - `results_url: string or null` URL to a `.jsonl` file containing the results of the Message Batch requests. Specified only once processing ends.
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For Message Batches, this is always `"message_batch"`. - - `"message_batch"` - -### Example - -```http + default: message_batch + +## Example + +```bash curl https://api.anthropic.com/v1/messages/batches \ -H 'Content-Type: application/json' \ -H 'anthropic-version: 2023-06-01' \
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}' ``` -#### Response +### Response (200) ```json {