[jaeminbird]

Fixes #7893.

response.incomplete is a terminal event sent instead of response.completed, but the streaming adapter treated it like response.in_progress, so a stream cut off by max_output_tokens or a content filter reported no UsageContent and no FinishReason. It now maps usage and the incomplete reason the same way the non-streaming path does.

Validation: the new test fails before the fix (FinishReason is null) and passes after; Microsoft.Extensions.AI.OpenAI.Tests (net10.0) pass, and the Release build for all target frameworks is clean.

Microsoft Reviewers: Open in CodeFlow

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[dotnet-comment-bot]

‼️ Found issues ‼️

Project	Coverage Type	Expected	Actual
Microsoft.Extensions.Diagnostics.Testing	Line	99	98.65 🔻
Microsoft.Extensions.Telemetry	Line	93	92.75 🔻
Microsoft.Extensions.AI	Line	89	88.4 🔻
Microsoft.Extensions.AI.OpenAI	Line	75	68.26 🔻
Microsoft.Extensions.AI.OpenAI	Branch	75	57.59 🔻
Microsoft.Extensions.DataIngestion.MarkItDown	Line	75	4.46 🔻
Microsoft.Extensions.DataIngestion.MarkItDown	Branch	75	0 🔻
Microsoft.Extensions.Diagnostics.ResourceMonitoring	Line	99	96.07 🔻
Microsoft.Extensions.Diagnostics.ResourceMonitoring	Branch	99	92.76 🔻
Microsoft.Extensions.Diagnostics.ResourceMonitoring.Kubernetes	Line	99	97.73 🔻
Microsoft.Extensions.ServiceDiscovery.Dns	Line	75	69.93 🔻
Microsoft.Extensions.ServiceDiscovery	Line	75	68.88 🔻
Microsoft.Extensions.ServiceDiscovery	Branch	75	71.43 🔻
Microsoft.Extensions.ServiceDiscovery.Abstractions	Line	75	42.11 🔻
Microsoft.Extensions.ServiceDiscovery.Abstractions	Branch	75	42.86 🔻
Microsoft.Extensions.ServiceDiscovery.Yarp	Line	75	73.85 🔻
Microsoft.Extensions.ServiceDiscovery.Yarp	Branch	75	70 🔻
Microsoft.Extensions.VectorData.Abstractions	Line	75	37.39 🔻
Microsoft.Extensions.VectorData.Abstractions	Branch	75	22.73 🔻

🎉 Good job! The coverage increased 🎉
Update MinCodeCoverage in the project files.

Project	Expected	Actual
Microsoft.Extensions.Http.Diagnostics	94	95
Microsoft.Gen.BuildMetadata	97	100
Microsoft.Gen.MetadataExtractor	57	73
Microsoft.Gen.MetricsReports	67	69
Microsoft.Extensions.AI.Abstractions	82	86
Microsoft.Extensions.AI.Evaluation.NLP	0	78
Microsoft.Extensions.Caching.Hybrid	82	85
Microsoft.Extensions.DataIngestion	75	89
Microsoft.Extensions.DataIngestion.Markdig	75	90
Microsoft.Extensions.Http.Resilience	97	100

Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1653868&view=codecoverage-tab

[valkiara]

Reviewed 79a424b. The adapter test project passed on net10.0 with SDK 10.0.401: 397 passed, 163 skipped with live integration tests disabled.

Seven local SSE cases also passed, covering max_output_tokens and content_filter with and without usage, null incomplete details, and store:false. I checked that partial text is not duplicated, usage is emitted once with cached/reasoning token counts preserved, and the terminal update retains its response/message IDs, role, model, timestamp and conversation behavior. The reason mapping matches the non-streaming path.

No issues found in the changed terminal-event handling.