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Add server tool call support to OpenTelemetryChatClient per semantic conventions #7240

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Merged
stephentoub merged 5 commits into from
Jan 31, 2026
Merged

Add server tool call support to OpenTelemetryChatClient per semantic conventions #7240

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c23d6c3
Initial plan
Copilot Jan 29, 2026
70f268d
Add server tool call content types support in OpenTelemetryChatClient
Copilot Jan 29, 2026
ec4cbe1
Fix code review feedback: Use IReadOnlyDictionary for Arguments property
Copilot Jan 29, 2026
ed7b3c4
Refactor server tool call types to use specialized classes per conten…
Copilot Jan 30, 2026
07050f9
Address code review feedback for ExtractCodeFromInputs method
Copilot Jan 30, 2026
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137 changes: 137 additions & 0 deletions src/Libraries/Microsoft.Extensions.AI/ChatCompletion/OpenTelemetryChatClient.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -311,6 +311,109 @@ internal static string SerializeChatMessages(
m.Parts.Add(new OtelGenericPart { Type = "error", Content = ec.Message });
break;

// Server tool call content types as specified in the OpenTelemetry semantic conventions:
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case CodeInterpreterToolCallContent citcc:
m.Parts.Add(new OtelServerToolCallPart
{
Id = citcc.CallId,
Name = "code_interpreter",
ServerToolCall = new OtelGenericServerToolCall
{
Type = "code_interpreter",
Inputs = citcc.Inputs,
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},
});
break;

case CodeInterpreterToolResultContent citrc:
m.Parts.Add(new OtelServerToolCallResponsePart
{
Id = citrc.CallId,
ServerToolCallResponse = new OtelGenericServerToolCallResponse
{
Type = "code_interpreter",
Output = citrc.Outputs,
},
});
break;

case ImageGenerationToolCallContent igtcc:
m.Parts.Add(new OtelServerToolCallPart
{
Id = igtcc.ImageId,
Name = "image_generation",
ServerToolCall = new OtelGenericServerToolCall
{
Type = "image_generation",
},
});
break;

case ImageGenerationToolResultContent igtrc:
m.Parts.Add(new OtelServerToolCallResponsePart
{
Id = igtrc.ImageId,
ServerToolCallResponse = new OtelGenericServerToolCallResponse
{
Type = "image_generation",
Output = igtrc.Outputs,
},
});
break;

case McpServerToolCallContent mstcc:
m.Parts.Add(new OtelServerToolCallPart
{
Id = mstcc.CallId,
Name = mstcc.ToolName,
ServerToolCall = new OtelGenericServerToolCall
{
Type = "mcp",
Arguments = mstcc.Arguments,
ServerName = mstcc.ServerName,
},
});
break;

case McpServerToolResultContent mstrc:
m.Parts.Add(new OtelServerToolCallResponsePart
{
Id = mstrc.CallId,
ServerToolCallResponse = new OtelGenericServerToolCallResponse
{
Type = "mcp",
Output = mstrc.Output,
},
});
break;

case McpServerToolApprovalRequestContent mstarc:
m.Parts.Add(new OtelServerToolCallPart
{
Id = mstarc.Id,
Name = mstarc.ToolCall.ToolName,
ServerToolCall = new OtelGenericServerToolCall
{
Type = "mcp_approval_request",
Arguments = mstarc.ToolCall.Arguments,
ServerName = mstarc.ToolCall.ServerName,
},
});
break;

case McpServerToolApprovalResponseContent mstaresp:
m.Parts.Add(new OtelServerToolCallResponsePart
{
Id = mstaresp.Id,
ServerToolCallResponse = new OtelGenericServerToolCallResponse
{
Type = "mcp_approval_response",
Approved = mstaresp.Approved,
},
});
break;

default:
JsonElement element = _emptyObject;
try
Expand Down Expand Up @@ -691,6 +794,36 @@ private sealed class OtelToolCallResponsePart
public object? Response { get; set; }
}

private sealed class OtelServerToolCallPart
{
public string Type { get; set; } = "server_tool_call";
public string? Id { get; set; }
public string? Name { get; set; }
public OtelGenericServerToolCall? ServerToolCall { get; set; }
}

private sealed class OtelServerToolCallResponsePart
{
public string Type { get; set; } = "server_tool_call_response";
public string? Id { get; set; }
public OtelGenericServerToolCallResponse? ServerToolCallResponse { get; set; }
}

private sealed class OtelGenericServerToolCall
{
public string? Type { get; set; }
public IReadOnlyDictionary<string, object?>? Arguments { get; set; }
public IList<AIContent>? Inputs { get; set; }
public string? ServerName { get; set; }
}

private sealed class OtelGenericServerToolCallResponse
{
public string? Type { get; set; }
public object? Output { get; set; }
public bool? Approved { get; set; }
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}

private sealed class OtelFunction
{
public string Type { get; set; } = "function";
Expand Down Expand Up @@ -727,6 +860,10 @@ private static JsonSerializerOptions CreateDefaultOptions()
[JsonSerializable(typeof(OtelFilePart))]
[JsonSerializable(typeof(OtelToolCallRequestPart))]
[JsonSerializable(typeof(OtelToolCallResponsePart))]
[JsonSerializable(typeof(OtelServerToolCallPart))]
[JsonSerializable(typeof(OtelServerToolCallResponsePart))]
[JsonSerializable(typeof(OtelGenericServerToolCall))]
[JsonSerializable(typeof(OtelGenericServerToolCallResponse))]
[JsonSerializable(typeof(IEnumerable<OtelFunction>))]
private sealed partial class OtelContext : JsonSerializerContext;
}
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