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Ben Thomas
6cd81286a9
* dotnet: Add hosted-agent User-Agent supplement to outgoing requests
When an agent runs inside a Foundry Hosted Agent, the outgoing
User-Agent header now includes 'agent-framework-hosted/{version}'
alongside the existing 'MEAI/{version}' segment.
- Add HostedAgentContext with AsyncLocal<string?> property
- MeaiUserAgentPolicy reads the supplement per-call
- AgentFrameworkResponseHandler sets/restores the context
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* chore: update hosted UA format to foundry-hosting/agent-framework-dotnet/{version}
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* Trying to get UA flowing, no luck yet.
* .NET: Polyfill MEAI OpenAIResponsesChatClient to add hosted-agent User-Agent supplement
When AgentFrameworkResponseHandler resolves an agent (i.e. we are running in a
hosted context), TryApplyUserAgent walks the agent's IChatClient decorator chain
to find MEAI's internal OpenAIResponsesChatClient and reflectively swaps its
inner _responseClient field with a DelegatingResponsesClient wrapper. The
wrapper overrides the public-virtual protocol methods to add a per-call
HostedAgentUserAgentPolicy to the RequestOptions and delegate to the inner
ResponsesClient. The OpenAI SDK's internal streaming overloads bottom out in
calls to the public-virtual non-streaming overloads via virtual dispatch on
this, so streaming is covered without overriding any non-virtual member.
The wrapper accepts any ResponsesClient-derived inner — both the Foundry
ProjectResponsesClient and the native OpenAI ResponsesClient — and preserves
the inner client's full pipeline (Transport, RetryPolicy, NetworkTimeout,
OrganizationId / ProjectId / UserAgentApplicationId, custom policies).
- Add DelegatingResponsesClient + HostedAgentUserAgentPolicy in Microsoft.Agents.AI.Foundry.Hosting.
- Add TryApplyUserAgent next to ApplyOpenTelemetry in FoundryHostingExtensions; wire it into AgentFrameworkResponseHandler.GetAgent for both keyed and default-agent paths.
- Drop earlier-iteration dead code: AddHostedAgentTelemetry extension, HostedUserAgentPolicy class, HostedAgentContext.cs, and the never-called ToRequestOptions helper.
- Revert RequestOptionsExtensions.MeaiUserAgentPolicy to MEAI-only (the supplement is now injected by the polyfill).
- Revert unrelated whitespace change in Agent_Step25_ToolboxServerSideTools sample.
- Tests cover streaming AND non-streaming, retry policy preservation, OrganizationId/ProjectId/UserAgentApplicationId pass-through, idempotency, native OpenAI ResponsesClient, and reflection guards for MEAI/OpenAI shape drift.
* .NET: Address review feedback on hosted-agent User-Agent polyfill
- TryApplyUserAgent: replace silent null-return with ArgumentNullException to match the codebase's convention.
- Add idempotency test (TryApplyUserAgent_CalledTwiceOnSameAgent_DoesNotDoubleWrap) — runs the polyfill twice on the same agent and asserts the wire UA contains exactly one foundry-hosting segment, proving the 'current is DelegatingResponsesClient' guard prevents nested wrapping.
- Add retry-double-append test (Polyfill_RetryWithinCall_DoesNotDuplicateSupplementInUserAgent) — exercises the HostedAgentUserAgentPolicy Contains-guard via a custom retry policy that re-runs the inner pipeline on the same message.
- Replace TryApplyUserAgent_NullAgent_ReturnsNullWithoutThrowing with TryApplyUserAgent_NullAgent_ThrowsArgumentNullException to match the new contract.
* .NET: Drop null check from TryApplyUserAgent and its now-redundant test
The two call sites in AgentFrameworkResponseHandler.GetAgent already null-check the agent before invoking TryApplyUserAgent, so the defensive ArgumentNullException is unreachable. Remove it and the corresponding test.
* .NET: Remove unused Microsoft.Shared.Diagnostics import in ServiceCollectionExtensions
The Throw.IfNull helper from this namespace was used by the now-removed null check in TryApplyUserAgent. Drop the unused import to satisfy IDE0005 in CI's full-project dotnet format run.
---------
Co-authored-by: alliscode <bentho@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com>
6cd81286a9
·
2026-04-30 16:37:54 +00:00
History
Get Started with Microsoft Agent Framework for C# Developers
Quickstart
Basic Agent - .NET
using Azure.AI.OpenAI;
using Azure.Identity;
using Microsoft.Agents.AI;
using OpenAI.Responses;
var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT")!;
var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME")!;
var agent = new AzureOpenAIClient(new Uri(endpoint), new AzureCliCredential())
.GetResponsesClient(deploymentName)
.AsAIAgent(name: "HaikuBot", instructions: "You are an upbeat assistant that writes beautifully.");
Console.WriteLine(await agent.RunAsync("Write a haiku about Microsoft Agent Framework."));
Examples & Samples
- Getting Started with Agents: basic agent creation and tool usage
- Agent Provider Samples: samples showing different agent providers
- Workflow Samples: advanced multi-agent patterns and workflow orchestration