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Roger Barreto afd2739e38 .NET: Surface x-ms-served-model header as ChatResponse.ModelId for Foundry agents (#5979)
* .NET: Surface x-ms-served-model header as ChatResponse.ModelId for Foundry agents

Mirrors Python PR #5910. Adds an internal SCM PipelinePolicy that reads the x-ms-served-model HTTP response header on Azure OpenAI Responses calls and writes it into an AsyncLocal box. A DelegatingChatClient sits between OpenTelemetry and the MEAI OpenAIResponsesChatClient and overwrites ChatResponse.ModelId with the served snapshot so OTel spans report the actual model rather than the deployment alias. Wired through all AsAIAgent paths in Microsoft.Agents.AI.Foundry.

* .NET: Fix line endings and BOM on ResponsesAgentServedModelTests

* .NET: Address Copilot review on Foundry served-model PR

- Restore previous ServedModelScope in finally to avoid AsyncLocal leak into caller execution context.
- Make served-model integration test assertion robust to deployment names that already match the snapshot pattern.
- Broaden UnitTests csproj comment to cover all conditional removals (net8.0+ requirement).

* .NET: Split ServedModelTests into per-SUT files with regions

Split the combined ServedModelTests.cs into one test class per SUT:

- ServedModelScopeTests.cs (AsyncLocal carrier)
- ServedModelPolicyTests.cs (SCM pipeline policy)
- ServedModelChatClientTests.cs (delegating client, with regions for Non-streaming / Streaming / End-to-end)

Shared helpers and fake clients moved into ServedModelTestHelpers.cs.

Csproj net8.0+ exclusion list updated accordingly.

* .NET: Consolidate served-model logic into FoundryChatClient

Move x-ms-served-model header capture from the standalone ServedModelChatClient
decorator directly into FoundryChatClient, eliminating a separate wrapper that
had to be applied at every Foundry entry point via WireServedModel().

- Register ServedModelPolicy in FoundryChatClient constructors (alongside the
  existing AgentFrameworkUserAgentPolicy registration)
- Add StrongBox push/read logic to FoundryChatClient.GetResponseAsync and
  GetStreamingResponseAsync
- Delete ServedModelChatClient.cs and its unit tests
- Remove WireServedModel() from FoundryAgent and AIProjectClientExtensions
- Update ServedModelPolicy/Scope XML docs to reference FoundryChatClient
- Simplify ServedModelTestHelpers to use FoundryChatClient directly

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
afd2739e38 · 2026-05-21 21:26:42 +00:00
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