.NET: Fix Structured Output for agents configured with function middleware#4179
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Pull request overview
Fixes FunctionInvocationDelegatingAgent.AgentRunOptionsWithFunctionMiddleware() so that when it converts a base AgentRunOptions into ChatClientAgentRunOptions, it preserves all relevant base properties instead of dropping them.
Changes:
- Copy
AllowBackgroundResponses,ContinuationToken, andAdditionalProperties(in addition toResponseFormat) duringAgentRunOptions→ChatClientAgentRunOptionsconversion. - Add a unit test that captures the converted options passed to an inner agent to verify preservation behavior.
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Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| dotnet/src/Microsoft.Agents.AI/FunctionInvocationDelegatingAgent.cs | Updates the conversion logic to carry over base AgentRunOptions properties into ChatClientAgentRunOptions. |
| dotnet/tests/Microsoft.Agents.AI.UnitTests/FunctionInvocationDelegatingAgentTests.cs | Adds a test to validate that options are preserved during the conversion path. |
dotnet/tests/Microsoft.Agents.AI.UnitTests/FunctionInvocationDelegatingAgentTests.cs
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…ptions properties When converting base AgentRunOptions to ChatClientAgentRunOptions, the middleware now preserves AllowBackgroundResponses, ContinuationToken, and AdditionalProperties in addition to ResponseFormat. Added unit test verifying all properties are preserved during the conversion. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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This was referenced Feb 27, 2026
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Summary
Fixes incomplete property preservation in
FunctionInvocationDelegatingAgent.AgentRunOptionsWithFunctionMiddleware()when converting baseAgentRunOptionstoChatClientAgentRunOptions.Changes
FunctionInvocationDelegatingAgent.cs— Copy all baseAgentRunOptionsproperties (AllowBackgroundResponses,ContinuationToken,AdditionalProperties) when converting toChatClientAgentRunOptions.FunctionInvocationDelegatingAgentTests.cs— Added unit test using anAnonymousDelegatingAIAgentspy to verify all original properties are preserved after conversion.Closes: #4118