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Modify VisionAgent to fetch and send image bytes #3045

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Modify VisionAgent to fetch and send image bytes #3045

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7 changes: 6 additions & 1 deletion dotnet/samples/GettingStarted/Agents/Agent_Step11_UsingImages/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,14 @@
name: "VisionAgent",
instructions: "You are a helpful agent that can analyze images");


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Copilot AI Dec 28, 2025

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There's an extra blank line here that should be removed to maintain consistency with the coding style in other samples.

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using HttpClient httpClient = new();
httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
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Copilot AI Dec 28, 2025

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The User-Agent header is added to work around the 403 Forbidden error, but there's no comment explaining why this is necessary. According to the coding guidelines, sample code should be well-documented with comments explaining the purpose of each step. Consider adding a comment above line 22 explaining that some image hosting services (like Wikipedia) require a User-Agent header to prevent automated scraping.

Copilot generated this review using guidance from repository custom instructions.
byte[] imageBytes = await httpClient.GetByteArrayAsync("https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg");

ChatMessage message = new(ChatRole.User, [
new TextContent("What do you see in this image?"),
new UriContent("https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Gfp-wisconsin-madison-the-nature-boardwalk.jpg/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg", "image/jpeg")
new DataContent(imageBytes, "image/jpeg")
]);

var thread = agent.GetNewThread();
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