Extensions.Bedrock.MEAI: Fix reading/writing ReasoningContent for tool use. #4080
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1. The `RedactedContent` property of `TextReasoningContent` is optional and not required for Claude 4 models. Don't throw new it's not found in `AdditionalProperties`. 2. Use `ProtectedData` for the "Signature" of the reasoning content so that it round trips. See: dotnet/extensions#6784 3. In `GetStreamingResponseAsync`, the final `ReasoningContentBlockDelta` may not have text, but it will have `Signature` and possibly `RedactedContent` These fix a scenario where thinking + tool use fails because the reasoning content sent back with the tool response is invalid.
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Description
RedactedContentproperty ofTextReasoningContentis optional and not required for Claude 4 models. Don't throw new it's not found inAdditionalProperties.ProtectedDatafor the "Signature" of the reasoning content so that it round trips. See: Add TextReasoningContent.ProtectedData dotnet/extensions#6784. Requires a bump in dependency patch version.GetStreamingResponseAsync, the finalReasoningContentBlockDeltamay not have text, but it will haveSignatureand possiblyRedactedContentMotivation and Context
These fix a scenario where thinking + tool use fails because the reasoning content sent back with the tool response is invalid.
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