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.NET: MissingMethodException on AIProjectClient.GetAIAgent #2869

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#2850
Closed
.NET: MissingMethodException on AIProjectClient.GetAIAgent#2869
#2850
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rogerbarreto
Labels
.NETUsage: [Issues, PRs], Target: .NetagentsUsage: [Issues, PRs], Target: Single agent

Description

@gopkumr
gopkumr
opened on Dec 15, 2025

Trying to use Agent Framework with the v2 Prompt agent in Microsoft Foundry and receiving "Method not found" Exception.

Code

var aiProjectClient = new AIProjectClient(new Uri(configuration.AIProjectEndpoint), new AzureCliCredential());
 var existingAgents = aiProjectClient.Agents.GetAgents();
 var existingAgent = existingAgents.FirstOrDefault(q => q.Name == _agentName);
AIAgent agent = aiProjectClient.GetAIAgent(existingAgent);

Exception

System.MissingMethodException: Method not found: 'OpenAI.Responses.OpenAIResponseClient OpenAI.OpenAIClient.GetOpenAIResponseClient(System.String)'.
          at Microsoft.Agents.AI.AzureAI.AzureAIProjectChatClient..ctor(AIProjectClient aiProjectClient, AgentReference agentReference, String defaultModelId, ChatOptions chatOptions)
          at Microsoft.Agents.AI.AzureAI.AzureAIProjectChatClient..ctor(AIProjectClient aiProjectClient, AgentReference agentReference, String defaultModelId, ChatOptions chatOptions)
          at Microsoft.Agents.AI.AzureAI.AzureAIProjectChatClient..ctor(AIProjectClient aiProjectClient, AgentVersion agentVersion, ChatOptions chatOptions)
          at Microsoft.Agents.AI.AzureAI.AzureAIProjectChatClient..ctor(AIProjectClient aiProjectClient, AgentRecord agentRecord, ChatOptions chatOptions)
          at Azure.AI.Projects.AzureAIProjectChatClientExtensions.CreateChatClientAgent(AIProjectClient aiProjectClient, AgentRecord agentRecord, ChatClientAgentOptions agentOptions, Func`2 clientFactory, IServiceProvider services)
          at Azure.AI.Projects.AzureAIProjectChatClientExtensions.CreateChatClientAgent(AIProjectClient AIProjectClient, AgentRecord agentRecord, IList`1 tools, Func`2 clientFactory, Boolean requireInvocableTools, IServiceProvider services)
          at Azure.AI.Projects.AzureAIProjectChatClientExtensions.GetAIAgent(AIProjectClient aiProjectClient, AgentRecord agentRecord, IList`1 tools, Func`2 clientFactory, IServiceProvider services)

Tried adding the below nuget Packages in an attempt to find the missing method

  • Azure.AI.OpenAI 2.8.0-beta.1
  • Azure.AI.Projects 1.2.0-beta.5
  • Azure.AI.Projects.OpenAI 1.0.0-beta.5
  • Microsoft.Agents.AI 1.0.0-preview.251204.1
  • Microsoft.Agents.AI.AzureAI 1.0.0-preview.251204.1
  • Microsoft.Agents.AI.OpenAI 1.0.0-preview.251204.1
  • Microsoft.Extensions.AI 10.1.1
  • Microsoft.Extensions.AI.OpenAI 10.1.1-preview.1.25612.2

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.NETUsage: [Issues, PRs], Target: .NetagentsUsage: [Issues, PRs], Target: Single agent

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