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.NET: Fix Error 404 Agent Hosted MCP (#3678)

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* Initial plan

* Fix issue #3195: Handle empty Version and ID in Azure AI agent responses

This fix addresses the issue where hosted MCP agents (like AgentWithHostedMCP)
fail with "ID cannot be null or empty (Parameter 'id')" error when deployed
to Azure AI Foundry.

Changes:
- Add CreateAgentReference helper method in AzureAIProjectChatClient that defaults
  empty version to "latest"
- Update CreateChatClientAgentOptions to generate a fallback ID from name and version
  when AgentVersion.Id is null or empty
- Add GetAgentVersionResponseJsonWithEmptyVersion and GetAgentResponseJsonWithEmptyVersion
  test data methods
- Add unit tests for empty version handling scenarios

Co-authored-by: rogerbarreto <19890735+rogerbarreto@users.noreply.github.com>

* Address code review feedback: improve documentation and test comments

Co-authored-by: rogerbarreto <19890735+rogerbarreto@users.noreply.github.com>

* Address PR review: Use IsNullOrWhiteSpace and add whitespace unit tests

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
This commit is contained in:
Roger Barreto
2026-02-05 13:39:59 +00:00
committed by GitHub
co-authored by copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
parent aa88195dcd
commit 2b66ca03b2
4 changed files with 308 additions and 13 deletions
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dotnet/src/Microsoft.Agents.AI.AzureAI/AzureAIProjectChatClientExtensions.cs
+8 -1
View File
@@ -543,9 +543,16 @@ public static partial class AzureAIProjectChatClientExtensions
}
}
// Use the agent version's ID if available, otherwise generate one from name and version.
// This handles cases where hosted agents (like MCP agents) may not have an ID assigned.
var version = string.IsNullOrWhiteSpace(agentVersion.Version) ? "latest" : agentVersion.Version;
var agentId = string.IsNullOrWhiteSpace(agentVersion.Id)
? $"{agentVersion.Name}:{version}"
: agentVersion.Id;
var agentOptions = new ChatClientAgentOptions()
{
Id = agentVersion.Id,
Id = agentId,
Name = agentVersion.Name,
Description = agentVersion.Description,
};