.NET: Use DefaultAzureCredential instead of AzureCliCredential

[SergeyMenshykh]

Motivation and Context

We got some feedback that customers are using other token credential types e.g. they may be using EnvironmentCredential. I think AzureCliCredential is the best option for us but possibly not for customers so we may want to consider changing this to DefaultCredential and providing a health warning on it's use.

Related item: #795

[Copilot]

Pull request overview

This PR updates all .NET sample code to use DefaultAzureCredential instead of AzureCliCredential for Azure authentication, addressing customer feedback that they use various credential types (e.g., EnvironmentCredential). The change enables samples to work with multiple authentication methods while maintaining backward compatibility with Azure CLI authentication.

Changes:

• Replaced all instances of AzureCliCredential with DefaultAzureCredential across 100+ sample files
• Added consistent WARNING comments to all credential instantiations explaining production considerations
• Updated documentation in README files to reference DefaultAzureCredential where modified

Reviewed changes

Copilot reviewed 113 out of 113 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
dotnet/samples/Purview/AgentWithPurview/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/M365Agent/README.md	Updated documentation to reference DefaultAzureCredential
dotnet/samples/M365Agent/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/HostedAgents/AgentsInWorkflows/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/HostedAgents/AgentWithTextSearchRag/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/HostedAgents/AgentWithHostedMCP/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/_Foundational/08_WriterCriticWorkflow/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/_Foundational/07_MixedWorkflowAgentsAndExecutors/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/_Foundational/04_AgentWorkflowPatterns/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/_Foundational/03_AgentsInWorkflows/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Observability/WorkflowAsAnAgent/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/ToolApproval/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/StudentTeacher/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/Marketing/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/InputArguments/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/HostedWorkflow/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/FunctionTools/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/ExecuteWorkflow/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/ExecuteCode/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/DeepResearch/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Declarative/CustomerSupport/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/ConditionalEdges/03_MultiSelection/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/ConditionalEdges/02_SwitchCase/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/ConditionalEdges/01_EdgeCondition/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Concurrent/Concurrent/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Agents/WorkflowAsAnAgent/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Agents/GroupChatToolApproval/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Agents/FoundryAgent/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Workflows/Agents/CustomAgentExecutors/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/ModelContextProtocol/ResponseAgent_Hosted_MCP/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/ModelContextProtocol/FoundryAgent_Hosted_MCP/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/ModelContextProtocol/Agent_MCP_Server_Auth/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/ModelContextProtocol/Agent_MCP_Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step27_LocalMCP/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step15_ComputerUse/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step14_CodeInterpreter/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step13_Plugins/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step12_Middleware/README.md	Updated documentation to reference DefaultAzureCredential
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step12_Middleware/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step11_AsFunctionTool/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step10_UsingImages/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step09_UsingMcpClientAsTools/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step08_DependencyInjection/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step07_Observability/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step06_PersistedConversations/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step05_StructuredOutput/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step04_UsingFunctionToolsWithApprovals/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step03_UsingFunctionTools/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step02_MultiturnConversation/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step01.2_Running/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step01.1_Basics/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/DevUI/DevUI_Step01_BasicUsage/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/DeclarativeAgents/ChatClient/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step20_AdditionalAIContext/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step19_Declarative/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step18_DeepResearch/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step17_BackgroundResponses/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step16_ChatReduction/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step15_Plugins/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step14_Middleware/README.md	Updated documentation to reference DefaultAzureCredential
dotnet/samples/GettingStarted/Agents/Agent_Step14_Middleware/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step13_BackgroundResponsesWithToolsAndPersistence/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step12_AsFunctionTool/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step11_UsingImages/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step10_AsMcpTool/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step09_DependencyInjection/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step08_Observability/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step07_3rdPartyChatHistoryStorage/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step06_PersistedConversations/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step05_StructuredOutput/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step04_UsingFunctionToolsWithApprovals/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step03_UsingFunctionTools/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step02_MultiturnConversation/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/Agents/Agent_Step01_Running/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step04_FoundryServiceRAG/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step03_CustomRAGDataSource/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step02_CustomVectorStoreRAG/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step01_BasicTextRAG/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithMemory/AgentWithMemory_Step03_CustomMemory/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithMemory/AgentWithMemory_Step02_MemoryUsingMem0/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentWithMemory/AgentWithMemory_Step01_ChatHistoryMemory/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureOpenAIResponses/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureOpenAIChatCompletion/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureFoundryModel/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureAIProject/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureAIAgentsPersistent/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AgentOpenTelemetry/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AGUI/Step05_StateManagement/Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AGUI/Step04_HumanInLoop/Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AGUI/Step03_FrontendTools/Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AGUI/Step02_BackendTools/Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/AGUI/Step01_GettingStarted/Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/GettingStarted/A2A/A2AAgent_AsFunctionTools/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/07_ReliableStreaming/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/06_LongRunningTools/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/05_AgentOrchestration_HITL/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/04_AgentOrchestration_Conditionals/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/03_AgentOrchestration_Concurrency/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/02_AgentOrchestration_Chaining/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/ConsoleApps/01_SingleAgent/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/08_ReliableStreaming/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/07_AgentAsMcpTool/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/06_LongRunningTools/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/05_AgentOrchestration_HITL/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/04_AgentOrchestration_Conditionals/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/03_AgentOrchestration_Concurrency/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/02_AgentOrchestration_Chaining/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/Durable/Agents/AzureFunctions/01_SingleAgent/Program.cs	Updated conditional to use DefaultAzureCredential with warning comment
dotnet/samples/AGUIWebChat/Server/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/AGUIClientServer/AGUIServer/Program.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/AGUIClientServer/AGUIDojoServer/ChatClientAgentFactory.cs	Updated to use DefaultAzureCredential with warning comment
dotnet/samples/A2AClientServer/A2AServer/HostAgentFactory.cs	Updated to use DefaultAzureCredential with warning comment