Add support for prompt caching directives in BedrockChatClient for MEAI #4037
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dscpinheiro
requested changes
Oct 13, 2025
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Thanks for the contribution! For now, can you remove the extensions/test/BedrockMEAITests/BedrockMEAITests.NetStandard.csproj file (and the changes to extensions/AWSSDK.Extensions.sln)?
Since it's a new project we'd have to update our internal build system to actually run it, and I don't want that to block the (straightforward) change from being released.
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@dscpinheiro I reverted those changes. Thanks for the feedback. |
dscpinheiro
approved these changes
Oct 14, 2025
peterrsongg
approved these changes
Oct 14, 2025
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This will be included in today's release of the SDK. |
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Description
Implements support for prompt caching using the
AdditionalPropertiesdictionary of bothChatMessageandAIContent. When constructing both the System and Message blocks, anyChatMessageorAIContextcan include in itsAdditionalPropertiesa "CachePoint" key which is an instance ofCachePointBlock.Inserting
CachePointBlockin the System block requires passing a non-emptyChatMessagewhere Role =ChatRole.System. We cannot include "CachePoint in theAdditionalPropertiesof theChatOptionsas this becomes serialized asAdditionalModelRequestFields.Motivation and Context
Fixes #3930
Testing
No existing test fixtures for this project. But I manually tested each case.
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