.NET: Fixes AgentWithHostedMCP chat fails: ErrorHTTP 404 (: 404) Resource not found #3856
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Pull request overview
Updates the AgentWithHostedMCP .NET sample to align with newer Azure AI Agent Server / Azure OpenAI packages and the current Microsoft.Extensions.AI.OpenAI integration approach, addressing the reported hosted MCP chat failure.
Changes:
- Bumps
Azure.AI.AgentServer.AgentFrameworkandAzure.AI.OpenAIpackage versions. - Moves the sample to
Microsoft.Extensions.AI.OpenAI10.3.0and adjusts the agent creation pipeline to convert the Responses client into anIChatClient. - Improves the sample HTTP request file formatting by adding the standard blank line between headers and JSON bodies.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| dotnet/samples/HostedAgents/AgentWithHostedMCP/run-requests.http | Adds blank lines between headers and bodies to ensure HTTP client tooling parses requests correctly. |
| dotnet/samples/HostedAgents/AgentWithHostedMCP/Program.cs | Updates the Responses client flow to AsIChatClient() before creating the agent; removes an unused/now-unneeded using. |
| dotnet/samples/HostedAgents/AgentWithHostedMCP/AgentWithHostedMCP.csproj | Updates package versions and removes now-unneeded OpenAI-specific Agent Framework package reference in favor of Microsoft.Extensions.AI.OpenAI 10.3.0. |
SergeyMenshykh
approved these changes
Feb 12, 2026
peibekwe
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Feb 12, 2026
westey-m
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Feb 12, 2026
Comment on lines
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| .AsIChatClient() | ||
| .CreateAIAgent( |
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Is this sample using some really old packages? We don't have a sync CreateAIAgent anymore after all, especially not on IChatClient. It should now all be AsAIAgent right? Also, why would we not use the extension method on the responses client directly. It should be equivalent to the one on IChatClient, right?
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Motivation and Context
AgentWithHostedMCPchat fails:ErrorHTTP 404 (: 404) Resource not found#3195