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.Net: Fix #13262: GeminiRequest to handle single turn requests correctly #13288

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.Net: Fix #13262: GeminiRequest to handle single turn requests correctly #13288

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55cd68d
Fix #13262: GeminiRequest to handle single turn requests correctly
icyca Oct 23, 2025
8d491df
Merge branch 'main' into orchestration-gemini-role-issue
markwallace-microsoft Nov 3, 2025
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14 changes: 11 additions & 3 deletions dotnet/src/Connectors/Connectors.Google/Core/Gemini/Models/GeminiRequest.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -119,11 +119,19 @@ private static GeminiRequest CreateGeminiRequest(string prompt)

private static GeminiRequest CreateGeminiRequest(ChatHistory chatHistory)
{
var contents = chatHistory
.Where(message => message.Role != AuthorRole.System)
.Select(CreateGeminiContentFromChatMessage).ToList();

// Gemini specific fix: single turn requests must end with "user" role or no role, prevents issue #13262
if (contents.Count == 1 && contents[0].Role == AuthorRole.Assistant)
{
contents[0].Role = null;
}

GeminiRequest obj = new()
{
Contents = chatHistory
.Where(message => message.Role != AuthorRole.System)
.Select(CreateGeminiContentFromChatMessage).ToList(),
Contents = contents,
SystemInstruction = CreateSystemMessages(chatHistory)
};
return obj;
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