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Remove special-casing of string enumerables in McpServerTool (#699)

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We special-case string enumerables, translating them to an array of text content blocks, but other enumerables just get serialized, and there's a reasonable expectation that returning a string[] would produce a JSON array of strings. Just delete the special-casing.
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Stephen Toub 2025-08-13 13:05:42 -04:00 • committed by GitHub
commit 70960e1f1b
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3 changed files with 3 additions and 11 deletions
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6
src/ModelContextProtocol.Core/Server/AIFunctionMcpServerTool.cs
View file

@ -270,12 +270,6 @@ internal sealed partial class AIFunctionMcpServerTool : McpServerTool
StructuredContent = structuredContent,
},
IEnumerable<string> texts => new()
{
Content = [.. texts.Select(x => new TextContentBlock { Text = x ?? string.Empty })],
StructuredContent = structuredContent,
},
IEnumerable<AIContent> contentItems => ConvertAIContentEnumerableToCallToolResult(contentItems, structuredContent),
IEnumerable<ContentBlock> contents => new()

3
tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs
View file

@ -254,8 +254,7 @@ public partial class McpServerBuilderExtensionsToolsTests : ClientServerTestBase
Assert.NotNull(result.Content);
Assert.NotEmpty(result.Content);
Assert.Equal("hello Peter", (result.Content[0] as TextContentBlock)?.Text);
Assert.Equal("hello2 Peter", (result.Content[1] as TextContentBlock)?.Text);
Assert.Equal("""["hello Peter","hello2 Peter"]""", (result.Content[0] as TextContentBlock)?.Text);
result = await client.CallToolAsync(
"SecondCustomTool",

5
tests/ModelContextProtocol.Tests/Server/McpServerToolTests.cs
View file

@ -356,9 +356,8 @@ public partial class McpServerToolTests
var result = await tool.InvokeAsync(
new RequestContext<CallToolRequestParams>(mockServer.Object),
TestContext.Current.CancellationToken);
Assert.Equal(2, result.Content.Count);
Assert.Equal("42", Assert.IsType<TextContentBlock>(result.Content[0]).Text);
Assert.Equal("43", Assert.IsType<TextContentBlock>(result.Content[1]).Text);
Assert.Single(result.Content);
Assert.Equal("""["42","43"]""", Assert.IsType<TextContentBlock>(result.Content[0]).Text);
}
[Fact]