https://learn.microsoft.com/en-us/dotnet/api/microsoft.agents.ai.aicontextprovider.storeinputmessagefilter?view=agent-framework-dotnet-latest
AIContextProvider.StoreInputMessageFilter Property (Microsoft.Agents.AI) | Microsoft Learn
Gets the filter function to apply to request messages before storing context via StoreAIContextAsync(AIContextProvider+InvokedContext, CancellationToken).
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