Following .NET quick start sample from readme throws internal exceptions "Unknown event type: session.usage_info"

[abpiskunov]

Exception thrown from request "(not specified)" for method session.event: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.Text.Json.JsonException: Unknown event type: session.usage_info
at GitHub.Copilot.SDK.SessionEventConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options)
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader& reader, ReadStack& state) at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1 utf8Json, JsonTypeInfo1 jsonTypeInfo, Nullable1 actualByteCount)
at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1 json, JsonTypeInfo1 jsonTypeInfo)
at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
at GitHub.Copilot.SDK.SessionEvent.FromJson(String json)
at GitHub.Copilot.SDK.CopilotClient.RpcHandler.OnSessionEvent(String sessionId, Nullable1 event) at InvokeStub_RpcHandler.OnSessionEvent(Object, Span1)
at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
--- End of inner exception stack trace ---
at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at StreamJsonRpc.TargetMethod.InvokeAsync(CancellationToken cancellationToken)
at StreamJsonRpc.JsonRpc.DispatchRequestAsync(JsonRpcRequest request, TargetMethod targetMethod, CancellationToken cancellationToken)
at StreamJsonRpc.JsonRpc.DispatchIncomingRequestAsync(JsonRpcRequest request)
JsonRpc Error: 10 : System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.Text.Json.JsonException: Unknown event type: session.usage_info
at GitHub.Copilot.SDK.SessionEventConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options)
at System.Text.Json.Serialization.JsonConverter1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue) at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
at System.Text.Json.Serialization.Metadata.JsonTypeInfo1.Deserialize(Utf8JsonReader& reader, ReadStack& state) at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1 utf8Json, JsonTypeInfo1 jsonTypeInfo, Nullable1 actualByteCount)
at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan1 json, JsonTypeInfo1 jsonTypeInfo)
at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
at GitHub.Copilot.SDK.SessionEvent.FromJson(String json)
at GitHub.Copilot.SDK.CopilotClient.RpcHandler.OnSessionEvent(String sessionId, Nullable1 event) at InvokeStub_RpcHandler.OnSessionEvent(Object, Span1)
at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
--- End of inner exception stack trace ---
at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at StreamJsonRpc.TargetMethod.InvokeAsync(CancellationToken cancellationToken)
at StreamJsonRpc.JsonRpc.DispatchRequestAsync(JsonRpcRequest request, TargetMethod targetMethod, CancellationToken cancellationToken)
at StreamJsonRpc.JsonRpc.DispatchIncomingRequestAsync(JsonRpcRequest request), session.event, (not specified),
The thread '.NET TP Worker' (51208) has exited with code 0 (0x0).
'Microsoft.UpgradeAssistant.Agents.Mcp.exe' (CoreCLR: clrhost): Loaded 'Z:\ProgramFiles\Microsoft Visual Studio\Dev18\Common7\IDE\PrivateAssemblies\Runtime\Microsoft.VisualStudio.Debugger.Runtime.NetCoreApp.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.

[github-actions]

Thank you for reporting this issue!

This is the same root cause as #30 (Python SDK) - the session.usage_info event type is not defined in the .NET SDK's SessionEventConverter. The Copilot server is sending this event type, but the SDK doesn't know how to handle it.

Labels applied:

• bug - Missing event type causes exceptions
• sdk/dotnet - Affects the .NET SDK implementation

This appears to be happening when following the quick start sample from the README. The fix will likely involve adding session.usage_info to the supported event types in the .NET SDK, similar to what needs to be done for Python.

AI generated by Issue Triage Agent

[SteveSandersonMS]

Thanks. This was fixed yesterday but we didn't push a release yet. Just released with a fix: https://www.nuget.org/packages/GitHub.Copilot.SDK/0.1.13 (note: NuGet is still refreshing its cache in case you see a 404 there right now)