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Clarify client handling of embedded binary tool resources (#1762)

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Co-authored-by: Luis Rodriguez <25299418+luisangelrod@users.noreply.github.com>
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Luis Rodriguez 2026-08-04 20:06:51 -04:00 • committed by GitHub
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39
tests/ModelContextProtocol.Tests/Protocol/CallToolResultTests.cs
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@ -1,4 +1,5 @@
using ModelContextProtocol.Protocol;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
@ -45,4 +46,42 @@ public static class CallToolResultTests
Assert.Null(deserialized.IsError);
Assert.Null(deserialized.Meta);
}
[Fact]
public static void CallToolResult_SerializationRoundTrip_PreservesEmbeddedPdfResource()
{
byte[] pdfBytes = Encoding.ASCII.GetBytes("%PDF-1.7\n");
var original = new CallToolResult
{
Content =
[
new EmbeddedResourceBlock
{
Resource = BlobResourceContents.FromBytes(
pdfBytes,
"file:///mypdf.pdf",
"application/pdf")
}
]
};
string json = JsonSerializer.Serialize(original, McpJsonUtilities.DefaultOptions);
using JsonDocument document = JsonDocument.Parse(json);
JsonElement resourceBlock = document.RootElement.GetProperty("content")[0];
Assert.Equal("resource", resourceBlock.GetProperty("type").GetString());
JsonElement resource = resourceBlock.GetProperty("resource");
Assert.Equal("file:///mypdf.pdf", resource.GetProperty("uri").GetString());
Assert.Equal("application/pdf", resource.GetProperty("mimeType").GetString());
Assert.Equal(Convert.ToBase64String(pdfBytes), resource.GetProperty("blob").GetString());
var deserialized = JsonSerializer.Deserialize<CallToolResult>(json, McpJsonUtilities.DefaultOptions);
Assert.NotNull(deserialized);
var embeddedResource = Assert.IsType<EmbeddedResourceBlock>(Assert.Single(deserialized.Content));
var pdfResource = Assert.IsType<BlobResourceContents>(embeddedResource.Resource);
Assert.Equal("file:///mypdf.pdf", pdfResource.Uri);
Assert.Equal("application/pdf", pdfResource.MimeType);
Assert.Equal(pdfBytes, pdfResource.DecodedData.ToArray());
}
}