Set IsError on CallToolResponse to true when result is ErrorContent

Andy Tagg · Andy Tagg · commit 6dec4dd48ff6 · 2025-05-07T15:01:02.000+01:00
diff --git a/src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs b/src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs
@@ -253,7 +253,8 @@ public override async ValueTask<CallToolResponse> InvokeAsync(
         {
             AIContent aiContent => new()
             {
-                Content = [aiContent.ToContent()]
+                Content = [aiContent.ToContent()],
+                IsError = aiContent is ErrorContent
             },
 
             null => new()
@@ -278,7 +279,8 @@ public override async ValueTask<CallToolResponse> InvokeAsync(
             
             IEnumerable<AIContent> contentItems => new()
             {
-                Content = [.. contentItems.Select(static item => item.ToContent())]
+                Content = [.. contentItems.Select(static item => item.ToContent())],
+                IsError = contentItems.Any(item => item is ErrorContent)
             },
             
             IEnumerable<Content> contents => new()

Original file line number	Diff line number	Diff line change
`@@ -253,7 +253,8 @@ public override async ValueTask<CallToolResponse> InvokeAsync(`
`253`	`253`	`{`
`254`	`254`	`AIContent aiContent => new()`
`255`	`255`	`{`
`256`		`- Content = [aiContent.ToContent()]`
	`256`	`+ Content = [aiContent.ToContent()],`
	`257`	`+ IsError = aiContent is ErrorContent`
`257`	`258`	`},`
`258`	`259`
`259`	`260`	`null => new()`
`@@ -278,7 +279,8 @@ public override async ValueTask<CallToolResponse> InvokeAsync(`
`278`	`279`
`279`	`280`	`IEnumerable<AIContent> contentItems => new()`
`280`	`281`	`{`
`281`		`- Content = [.. contentItems.Select(static item => item.ToContent())]`
	`282`	`+ Content = [.. contentItems.Select(static item => item.ToContent())],`
	`283`	`+ IsError = contentItems.Any(item => item is ErrorContent)`
`282`	`284`	`},`
`283`	`285`
`284`	`286`	`IEnumerable<Content> contents => new()`