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Fix: Add missing ChatMessage[] handler to ChatProtocolExecutor (#1337)

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- Added ChatMessage[] handler to ConfigureRoutes to support array dispatch
- Workflow runtime can dispatch messages as either List<ChatMessage> or ChatMessage[]
- Added 10 comprehensive unit tests validating message routing behavior
- Tests ensure functionality and protect against future refactoring (issue #782)
- Updated code comments to reflect exact-type-matching requirement

Fixes issue where raw WorkflowBuilder with AIAgent nodes failed to receive
initial messages due to missing array type handler.
This commit is contained in:
Christian Glessner
2025-10-09 10:00:09 +00:00
committed by GitHub
parent d16d56b555
commit 8967269d3e
2 changed files with 268 additions and 0 deletions
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dotnet/src/Microsoft.Agents.AI.Workflows/ChatProtocolExecutor.cs
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@@ -33,8 +33,10 @@ internal abstract class ChatProtocolExecutor(string id, ChatProtocolExecutorOpti
routeBuilder = routeBuilder.AddHandler<string>((message, _, __) => this._pendingMessages.Add(new(this._stringMessageChatRole.Value, message)));
}
// Routing requires exact type matches. The runtime may dispatch either List<ChatMessage> or ChatMessage[].
return routeBuilder.AddHandler<ChatMessage>((message, _, __) => this._pendingMessages.Add(message))
.AddHandler<List<ChatMessage>>((messages, _, __) => this._pendingMessages.AddRange(messages))
.AddHandler<ChatMessage[]>((messages, _, __) => this._pendingMessages.AddRange(messages))
.AddHandler<TurnToken>(this.TakeTurnAsync);
}