.NET: [Bug]: CompactionMessageIndex.IsSummaryMessage always returns false because TryGetValue returns value as JsonElement

[zengyun261]

Description

In IsSummaryMessage, the value obtained via TryGetValue is of type JsonElement, which causes the is true check to always return false. As a result, CompactionMessageGroup.Kind is never set to Summary.

Code Sample

Error Messages / Stack Traces

Package Versions

1.13.0

.NET Version

.NET 10

Additional Context

No response

[github-actions]

🤖 Automated triage reproduction notes (agent-authored — trust but verify)

Agent analysis

Repro: CompactionMessageIndex.IsSummaryMessage() in dotnet/src/Microsoft.Agents.AI/Compaction/CompactionMessageIndex.cs (line 526-528) fails when the _is_summary AditionalProperties value is a JsonElement (as occurs after JSON deserialization) because value is true only pattern-matches a boxed bool. Minimal repro: create a ChatMessage with role=Assistant, set AditionalProperties["_is_summary"] to JsonDocument.Parse("true").RootElement.Clone(), call CompactionMessageIndex.Create() and observe the group Kind is AssistantText instead of Summary.

• Failing test: dotnet/tests/Microsoft.Agents.AI.UnitTests/Compaction/IsSummaryMessageJsonElementBugTest.cs
• Files examined: dotnet/src/Microsoft.Agents.AI/Compaction/CompactionMessageIndex.cs, dotnet/src/Microsoft.Agents.AI/Compaction/CompactionMessageGroup.cs, dotnet/tests/Microsoft.Agents.AI.UnitTests/Compaction/CompactionMessageIndexTests.cs
• Tests run: dotnet/tests/Microsoft.Agents.AI.UnitTests/Compaction/IsSummaryMessageJsonElementBugTest.cs
• Reported version: 1.13.0
• Current version: 1.13.0