MicrosoftExtensions: Idiomatic CacheControl Support #73
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Let me know if you want a separate extension for beta and non-beta cache control (currently the outer one is shared). I also added a new file. I can fold it into the extensions file, but it's getting massive, so I think if it's not ok to have more than one top-level MEAI related file - then maybe there should be a folder? Otherwise the file is just going to keep growing and get more and more unwieldy. |
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Add AIContentCacheExtensions with WithCacheControl() methods that allow setting Anthropic prompt caching on AIContent instances via AdditionalProperties. Changes: - New AIContentCacheExtensions.cs with WithCacheControl(CacheControlEphemeral) and WithCacheControl(TTL) extension methods - Update CreateMessageParams in both AnthropicClientExtensions and AnthropicBetaClientExtensions to apply cache control when mapping AIContent to Anthropic content block params (TextBlockParam, ImageBlockParam, DocumentBlockParam, ToolUseBlockParam, ToolResultBlockParam) - Fix system message handling in both clients to support cache control - Add unit tests for extension methods and request serialization The Beta client converts from CacheControlEphemeral to BetaCacheControlEphemeral internally, so users can use the same extension methods with both clients. Usage: ```csharp var systemContent = new TextContent(prompt).WithCacheControl(TTL.TTL1h); var lastContent = messages[^1].Contents.Last().WithCacheControl(TTL.TTL5m); ``` Note: ThinkingBlockParam/BetaThinkingBlockParam and RedactedThinkingBlockParam/ BetaRedactedThinkingBlockParam do not support cache control in the Anthropic API.
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For agentic loops the cost difference between caching and not caching is massive, and it's really awkward to use caching with the extensions. And not really possible at all at the system-level (because of how it converts without using the raw representation factory). Using raw representation factory also means one has to re-implement the mapping from MEAI to Anthropic content types. Instead this PR adds a new extension method that uses AdditionalProperties to store the CacheControl and then uses it while mapping in the existing extension code.