.Net: feat(connectors): Support ImageContent in tool/function results#13431
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Cozmopolit wants to merge 4 commits intomicrosoft:mainfrom
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.Net: feat(connectors): Support ImageContent in tool/function results#13431Cozmopolit wants to merge 4 commits intomicrosoft:mainfrom
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Enable ImageContent preservation in function results for multimodal-capable connectors (Gemini 3+). Non-supporting connectors return clear error message. Changes: - FunctionCallsProcessor: Return object instead of string, preserve ImageContent - Gemini: Native support via FunctionResponse.Parts with inlineData - OpenAI/Bedrock Agents: Error handling with ImageContentNotSupportedErrorMessage Includes 5 new unit tests for ImageContent handling. Fixes microsoft#13430
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@Cozmopolit Thanks for the contribution! With the latest merges into the Google connector this PR is now with a conflict, appreciate if you can take a look. |
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Done, test file conflict resolved. |
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Jan 27, 2026
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Motivation and Context
Fixes #13430
Currently, when a Semantic Kernel function returns
ImageContent, it gets serialized to JSON - losing the binary image data and preventing multimodal-capable models from processing the image.This PR enables
ImageContentpreservation in tool/function results, allowing connectors with multimodal capabilities (Gemini 3+, Anthropic) to pass images natively to the model. This is essential for agentic workflows where tools generate or process images that the model needs to analyze.Description
FunctionCallsProcessor (shared infrastructure)
ProcessFunctionResult()return type fromstringtoobjectImageContentto preserve it for multimodal-capable connectorsImageContentNotSupportedErrorMessageconstant for consistent error messagingGoogle Gemini Connector (native support)
FunctionResponsePartwithPartsproperty for nested multimodal contentFunctionResponsePartContentclass withInlineDatasupportCreateImageFunctionResponsePart()to convertImageContentto Gemini's nativeinlineDataformatOpenAI Connector (error handling)
ImageContentcheck with clear error message (API does not support images in tool results)OpenAI Agents (error handling)
GetFunctionResultAsString()helper withImageContenterror handlingAmazon Bedrock Agents (error handling)
GetFunctionResultAsString()helper withImageContenterror handlingNew Unit Tests
ItShouldPreserveImageContentWithoutSerializationFunctionCallsProcessorTests.csFromChatHistoryImageContentInToolResultCreatesInlineDataPartGeminiRequestTests.csFromChatHistoryImageContentWithoutDataThrowsInvalidOperationExceptionGeminiRequestTests.csFromChatHistoryImageContentWithoutMimeTypeThrowsInvalidOperationExceptionGeminiRequestTests.csVerifyAssistantMessageAdapterGetMessageWithImageContentInFunctionResultAssistantMessageFactoryTests.csNotes
FunctionResultContent.Resultproperty is alreadyobject?.functionResponse.parts, the API will return an appropriate error.ImageContentwith binary data is supported. URI-basedImageContentwill throwInvalidOperationException.ProcessFunctionResultimplementation.Contribution Checklist
sk-pr-MultimodalToolResults.md