Changes to Count tokens in a Message

Changed in 22 of the 68 revisions of this API.▲12●3○142

1. Sep 1, 2026d1d189d791d1●2○1
2. Aug 19, 202667ee007cda1c○26
3. Aug 14, 2026e9d8152420c3▲1○1
4. Aug 13, 20266e9020ec2b41○27
5. Aug 6, 2026538e9bd0db77▲1
6. Jul 24, 2026a97790bd7f18▲1○1
7. Jun 30, 20267caa9a75ddbc○1
8. Jun 29, 20264465f98f96c1○1
9. Jun 25, 20269445a445fbbe○1
10. Jun 18, 2026063bcb9d6cf9▲1○17
11. Jun 9, 202600259327305f▲1○1
12. Jun 6, 2026546c704d347b▲1○2
13. May 28, 2026f9d488f9290d○5
14. May 6, 2026a4186730f56c▲1
15. Apr 30, 20266edc6519fd32▲1
16. Apr 16, 2026e0696f59ae07▲1○2
17. Apr 8, 202669486316563e▲1○1
18. Mar 16, 20267fce94a3c9f7▲1○4
19. Feb 19, 202629a6b7ba5194○1
20. Feb 18, 20265387c517ad6a○15
21. Feb 17, 20266924f88807cb●1
22. Feb 17, 202653a0f3638030▲1○35

What changed

• Sep 1, 2026d1d189d791d1●2○1See the full diff
  • ●

    removed the request property tools/items/oneOf[subschema #7: BrowserToolset_20260801]/allowed_callers

    request-property-removed

  • ●

    removed the request property tools/items/oneOf[subschema #9: ComputerToolset_20260801]/allowed_callers

    request-property-removed

  • ○

    added subschema #2 subschema #3 to the model request property anyOf list

    request-property-any-of-added

  This revision also has 1 change that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

• Aug 19, 202667ee007cda1c○26See the full diff
  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/transformations

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #2: RequestImageBlock]/transformations

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/transformations

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #7: RequestToolUseBlock]/toolset_name

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #2: RequestImageBlock]/transformations

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/transformations

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/toolset_name

    new-optional-request-property

  • ○

    added browser_state discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #2: RequestImageBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #2: RequestImageBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added file discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/source request property

    request-property-discriminator-mapping-added

  • ○

    added BrowserToolset_20260801 ComputerToolset_20260801 to the tools/items request property oneOf list

    request-property-one-of-added

  • ○

    added FileDocumentSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileDocumentSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileDocumentSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileImageSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileImageSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #2: RequestImageBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileImageSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileImageSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #2: RequestImageBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added FileImageSource to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #2: RequestImageBlock]/source request property oneOf list

    request-property-one-of-added

  • ○

    added RequestBrowserStateBlock to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items request property oneOf list

    request-property-one-of-added

• Aug 14, 2026e9d8152420c3▲1○1See the full diff
  • ▲

    removed RequestMidConvSystemBlock from the messages/items/content/anyOf[subschema #2]/items request property oneOf list

    request-property-one-of-removed

  • ○

    removed mid_conv_system discriminator mapping keys from the messages/items/content/anyOf[subschema #2]/items request property

    request-property-discriminator-mapping-deleted

  This revision also has 2 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

• Aug 13, 20266e9020ec2b41○27See the full diff
  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #2: RequestWebFetchResultBlock]/content/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #17: RequestMidConvSystemBlock]/content/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #17: RequestMidConvSystemBlock]/content/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #17: RequestMidConvSystemBlock]/content/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestSearchResultBlock]/content/items/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestSearchResultBlock]/content/items/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestSearchResultBlock]/content/items/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestSearchResultBlock]/content/items/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestSearchResultBlock]/content/items/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #3: RequestSearchResultBlock]/content/items/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items/oneOf[subschema #4: RequestDocumentBlock]/source/oneOf[subschema #3: ContentBlockSource]/content/anyOf[subschema #2: content_block_source_content]/items/oneOf[subschema #1: RequestTextBlock]/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the system/anyOf[subschema #2]/items/citations/anyOf[subschema #1]/items/oneOf[subschema #1: RequestCharLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the system/anyOf[subschema #2]/items/citations/anyOf[subschema #1]/items/oneOf[subschema #2: RequestPageLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

  • ○

    the system/anyOf[subschema #2]/items/citations/anyOf[subschema #1]/items/oneOf[subschema #3: RequestContentBlockLocationCitation]/document_title/anyOf[subschema #1] request property's maxLength was increased from 255 to 500

    request-property-max-length-increased

• Aug 6, 2026538e9bd0db77▲1See the full diff
  • ▲

    removed subschema #17 subschema #18 from the model request property anyOf list

    request-property-any-of-removed

• Jul 24, 2026a97790bd7f18▲1○1See the full diff
  • ▲

    removed subschema #5 subschema #6 subschema #8 subschema #12 subschema #13 subschema #16 subschema #17 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added subschema #5 subschema #6 subschema #7 subschema #9 subschema #13 subschema #14 subschema #17 subschema #18 to the model request property anyOf list

    request-property-any-of-added

• Jun 30, 20267caa9a75ddbc○1See the full diff
  • ○

    added subschema #2 to the model request property anyOf list

    request-property-any-of-added

• Jun 29, 20264465f98f96c1○1See the full diff
  • ○

    added WebSearchTool_20260318 WebFetchTool_20260318 to the tools/items request property oneOf list

    request-property-one-of-added

• Jun 25, 20269445a445fbbe○1See the full diff
  • ○

    added the new optional header request parameter anthropic-user-profile-id

    new-optional-request-parameter

• Jun 18, 2026063bcb9d6cf9▲1○17See the full diff
  • ▲

    removed subschema #17 subschema #18 subschema #19 subschema #20 subschema #21 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #10: WebSearchTool_20250305 -> subschema #11: WebSearchTool_20250305]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #11: WebFetchTool_20250910 -> subschema #12: WebFetchTool_20250910]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #12: WebSearchTool_20260209 -> subschema #13: WebSearchTool_20260209]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #13: WebFetchTool_20260209 -> subschema #14: WebFetchTool_20260209]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #14: WebFetchTool_20260309 -> subschema #15: WebFetchTool_20260309]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #15: ToolSearchToolBM25_20251119 -> subschema #16: ToolSearchToolBM25_20251119]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #16: ToolSearchToolRegex_20251119 -> subschema #17: ToolSearchToolRegex_20251119]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #1: Tool]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #2: BashTool_20250124]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #3: CodeExecutionTool_20250522]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #4: CodeExecutionTool_20250825]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #5: CodeExecutionTool_20260120]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #6: MemoryTool_20250818 -> subschema #7: MemoryTool_20250818]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #7: TextEditor_20250124 -> subschema #8: TextEditor_20250124]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #8: TextEditor_20250429 -> subschema #9: TextEditor_20250429]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260521 enum value to the request property tools/items/oneOf[subschema #9: TextEditor_20250728 -> subschema #10: TextEditor_20250728]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added CodeExecutionTool_20260521 to the tools/items request property oneOf list

    request-property-one-of-added

  This revision also has 1 change that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

• Jun 9, 202600259327305f▲1○1See the full diff
  • ▲

    removed subschema #4 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added subschema #2 subschema #3 subschema #6 to the model request property anyOf list

    request-property-any-of-added

• Jun 6, 2026546c704d347b▲1○2See the full diff
  • ▲

    removed subschema #13 subschema #14 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #15: RequestToolSearchToolResultBlock]/content/anyOf[subschema #1: RequestToolSearchToolResultError]/error_message

    new-optional-request-property

  • ○

    added subschema #13 subschema #14 to the model request property anyOf list

    request-property-any-of-added

• May 28, 2026f9d488f9290d○5See the full diff
  • ○

    added subschema #2 to the model request property anyOf list

    request-property-any-of-added

  • ○

    added mid_conv_system discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items request property

    request-property-discriminator-mapping-added

  • ○

    added the new system enum value to the request property messages/items/role

    request-property-enum-value-added

  • ○

    added the new url_not_in_prior_context enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #11: RequestWebFetchToolResultBlock]/content/anyOf[subschema #1: RequestWebFetchToolResultError]/error_code

    request-property-enum-value-added

  • ○

    added RequestMidConvSystemBlock to the messages/items/content/anyOf[subschema #2]/items request property oneOf list

    request-property-one-of-added

• May 6, 2026a4186730f56c▲1See the full diff
  • ▲

    the tools/items/oneOf[subschema #9: TextEditor_20250728]/input_examples/items/additionalProperties request property type changed from unknown to no type

    request-property-type-changed

  This revision also has 22 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

• Apr 30, 20266edc6519fd32▲1See the full diff
  • ▲

    the tools/items/oneOf[subschema #9: TextEditor_20250728]/input_examples/items/additionalProperties request property type changed from no type to unknown

    request-property-type-changed

• Apr 16, 2026e0696f59ae07▲1○2See the full diff
  • ▲

    removed subschema #13 subschema #14 subschema #15 subschema #16 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added subschema #2 subschema #14 subschema #15 subschema #16 subschema #17 to the model request property anyOf list

    request-property-any-of-added

  • ○

    added the new xhigh enum value to the request property output_config/effort/anyOf[subschema #1: EffortLevel]

    request-property-enum-value-added

• Apr 8, 202669486316563e▲1○1See the full diff
  • ▲

    removed subschema #2 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added subschema #2 subschema #3 to the model request property anyOf list

    request-property-any-of-added

• Mar 16, 20267fce94a3c9f7▲1○4See the full diff
  • ▲

    removed subschema #3 subschema #6 subschema #7 subschema #8 subschema #9 subschema #10 subschema #11 subschema #14 subschema #15 subschema #16 subschema #17 subschema #18 subschema #19 subschema #20 subschema #21 subschema #22 subschema #23 from the model request property anyOf list

    request-property-any-of-removed

  • ○

    added the new optional request property thinking/oneOf[subschema #1: ThinkingConfigEnabled]/display

    new-optional-request-property

  • ○

    added the new optional request property thinking/oneOf[subschema #3: ThinkingConfigAdaptive]/display

    new-optional-request-property

  • ○

    added subschema #3 subschema #4 subschema #5 subschema #8 subschema #9 subschema #10 subschema #11 subschema #12 subschema #13 subschema #16 to the model request property anyOf list

    request-property-any-of-added

  • ○

    added WebFetchTool_20260309 to the tools/items request property oneOf list

    request-property-one-of-added

• Feb 19, 202629a6b7ba5194○1See the full diff
  • ○

    added the new optional request property cache_control

    new-optional-request-property

• Feb 18, 20265387c517ad6a○15See the full diff
  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #10: WebSearchTool_20250305]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #11: WebFetchTool_20250910]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #12: WebSearchTool_20260209]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #13: WebFetchTool_20260209]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #14: ToolSearchToolBM25_20251119]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #15: ToolSearchToolRegex_20251119]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #1: Tool]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #2: BashTool_20250124]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #3: CodeExecutionTool_20250522]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #4: CodeExecutionTool_20250825]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #5: CodeExecutionTool_20260120]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #6: MemoryTool_20250818]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #7: TextEditor_20250124]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #8: TextEditor_20250429]/allowed_callers/items

    request-property-enum-value-added

  • ○

    added the new code_execution_20260120 enum value to the request property tools/items/oneOf[subschema #9: TextEditor_20250728]/allowed_callers/items

    request-property-enum-value-added

• Feb 17, 20266924f88807cb●1See the full diff
  • ●

    removed the request property speed

    request-property-removed

  This revision also has 1 change that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog

• Feb 17, 202653a0f3638030▲1○35See the full diff
  • ▲

    request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name was restricted to a list of enum values

    request-property-became-enum

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #10: RequestWebSearchToolResultBlock]/caller

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #7: RequestToolUseBlock]/caller

    new-optional-request-property

  • ○

    added the new optional request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/caller

    new-optional-request-property

  • ○

    added the new optional request property speed

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #1: Tool]/allowed_callers

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #1: Tool]/defer_loading

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #1: Tool]/input_examples

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #2: BashTool_20250124]/allowed_callers

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #2: BashTool_20250124]/defer_loading

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #2: BashTool_20250124]/input_examples

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #3: TextEditor_20250124 -> subschema #7: TextEditor_20250124]/allowed_callers

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #3: TextEditor_20250124 -> subschema #7: TextEditor_20250124]/defer_loading

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #3: TextEditor_20250124 -> subschema #7: TextEditor_20250124]/input_examples

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #4: TextEditor_20250429 -> subschema #8: TextEditor_20250429]/allowed_callers

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #4: TextEditor_20250429 -> subschema #8: TextEditor_20250429]/defer_loading

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #4: TextEditor_20250429 -> subschema #8: TextEditor_20250429]/input_examples

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #5: TextEditor_20250728 -> subschema #9: TextEditor_20250728]/allowed_callers

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #5: TextEditor_20250728 -> subschema #9: TextEditor_20250728]/defer_loading

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #5: TextEditor_20250728 -> subschema #9: TextEditor_20250728]/input_examples

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #6: WebSearchTool_20250305 -> subschema #10: WebSearchTool_20250305]/allowed_callers

    new-optional-request-property

  • ○

    added the new optional request property tools/items/oneOf[subschema #6: WebSearchTool_20250305 -> subschema #10: WebSearchTool_20250305]/defer_loading

    new-optional-request-property

  • ○

    added subschema #3 to the model request property anyOf list

    request-property-any-of-added

  • ○

    the name request property const value web_search was removed

    request-property-const-removed

  • ○

    added bash_code_execution_tool_result code_execution_tool_result container_upload text_editor_code_execution_tool_result tool_search_tool_result web_fetch_tool_result discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items request property

    request-property-discriminator-mapping-added

  • ○

    added tool_reference discriminator mapping keys to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items request property

    request-property-discriminator-mapping-added

  • ○

    added the new bash_code_execution enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added the new code_execution enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added the new text_editor_code_execution enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added the new tool_search_tool_bm25 enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added the new tool_search_tool_regex enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added the new web_fetch enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added the new web_search enum value to the request property messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #9: RequestServerToolUseBlock]/name

    request-property-enum-value-added

  • ○

    added CodeExecutionTool_20250522 CodeExecutionTool_20250825 CodeExecutionTool_20260120 MemoryTool_20250818 WebFetchTool_20250910 WebSearchTool_20260209 WebFetchTool_20260209 ToolSearchToolBM25_20251119 ToolSearchToolRegex_20251119 to the tools/items request property oneOf list

    request-property-one-of-added

  • ○

    added RequestToolReferenceBlock to the messages/items/content/anyOf[subschema #2]/items/oneOf[subschema #8: RequestToolResultBlock]/content/anyOf[subschema #2]/items request property oneOf list

    request-property-one-of-added

  • ○

    added RequestWebFetchToolResultBlock RequestCodeExecutionToolResultBlock RequestBashCodeExecutionToolResultBlock RequestTextEditorCodeExecutionToolResultBlock RequestToolSearchToolResultBlock RequestContainerUploadBlock to the messages/items/content/anyOf[subschema #2]/items request property oneOf list

    request-property-one-of-added