// Provides research patterns for Foundry Agent Service SDK. Use when implementing agent features, looking up SDK methods, finding code samples, or troubleshooting Azure.AI.Projects API usage.
Provides deployment commands and troubleshooting for Azure Container Apps. Use when running azd commands, deploying containers, debugging deployment failures, or updating infrastructure in this repository.
Provides SSE streaming patterns for the chat API and frontend. Use when implementing or modifying chat streaming, handling SSE events, or troubleshooting message flow between frontend and backend.
Provides architecture overview with state machines, SSE event flow, and file mappings. Use when understanding system design, debugging state issues, or maintaining ARCHITECTURE-FLOW.md.
Provides C# and ASP.NET Core coding standards for this repository. Use when writing or modifying C# code, implementing API endpoints, configuring middleware, or working with authentication in the backend.
Diagnose and fix incomplete local development setup. Use when dev servers fail to start, env vars are missing, authentication errors occur, or before running any dev commands for the first time.
Provides TypeScript and React coding standards for this repository. Use when writing or modifying TypeScript code, creating React components, implementing MSAL authentication, or working with the frontend.
| name | researching-azure-ai-sdk |
| description | Provides research patterns for Foundry Agent Service SDK. Use when implementing agent features, looking up SDK methods, finding code samples, or troubleshooting Azure.AI.Projects API usage. |
CRITICAL: Don't guess SDK usage. Follow this research workflow.
Multi-repo research blows up context (1000+ tokens per file). Delegate to subagent for:
runSubagent(
prompt: "RESEARCH task - do NOT write code.
**Question**: [specific SDK question]
**Search these sources in order**:
1. Azure.AI.Projects SDK: github.com/Azure/azure-sdk-for-net/tree/main/sdk/ai/Azure.AI.Projects
2. Azure.AI.Agents.Persistent samples: .../Azure.AI.Agents.Persistent/samples
3. Microsoft Foundry Samples: github.com/microsoft-foundry/foundry-samples
**Find**:
- Method signatures for [specific API]
- Usage examples (pseudocode only)
- Any gotchas or edge cases
**Return** (max 20 lines):
- Key method name and signature
- Code pattern (pseudocode)
- File path where found (for later reference)
Do NOT include full file contents.",
description: "SDK research: [topic]"
)
| Delegate to Subagent | Keep Inline |
|---|---|
| Multi-repo code search | Local codebase grep |
| Finding all usages | Known method lookup |
| API surface exploration | Single file read |
| Pattern comparison | Quick signature check |
| Sample discovery | Using known pattern |
The Foundry Agent Service SDK has two API surfaces for agents:
| API | Endpoint | ID Format | SDK Access |
|---|---|---|---|
| v2 Agents API | /agents/ | Human-readable (e.g., dadjokes) | AIProjectClient.AgentAdministrationClient |
| OpenAI Assistants API | /assistants/ | OpenAI format (e.g., asst_xxx) | PersistentAgentsClient |
This project uses v2 Agents API for human-readable agent IDs.
Azure.AI.Projects (Main Entry Point)
├── AIProjectClient
│ ├── .AgentAdministrationClient.GetAgentVersionAsync() → ProjectsAgentVersion (v2 Agents API)
│ ├── .GetPersistentAgentsClient() → PersistentAgentsClient (Assistants API)
│ └── .ProjectOpenAIClient.GetProjectResponsesClientForAgent() → ProjectResponsesClient (Responses API)
└── Companion packages:
├── Azure.AI.Projects.Agents (ProjectsAgentVersion, DeclarativeAgentDefinition, …)
├── Azure.AI.Extensions.OpenAI (ProjectConversationsClient, ProjectOpenAIClient, …)
└── OpenAI.Responses (streaming types)
Azure.AI.Projects SDK: https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/ai/Azure.AI.Projects
tests/Samples/ folder with full examplesAzure.AI.Agents.Persistent SDK: https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/ai/Azure.AI.Agents.Persistent
Sample9_PersistentAgents_Streaming.md - Basic streaming patternSample8_PersistentAgents_FunctionsWithStreaming.md - Tool calls with streamingSample27_PersistentAgents_MCP_Streaming.md - MCP server integrationMicrosoft Foundry Samples: https://github.com/microsoft-foundry/foundry-samples
samples/csharp/quickstart/quickstart-chat-with-agent.cs - Responses API patternsamples/csharp/quickstart/ - Multiple quickstart examplesKey pattern from official quickstart:
AIProjectClient projectClient = new(new Uri(projectEndpoint), new AzureCliCredential());
ProjectConversation conversation = projectClient.ProjectOpenAIClient.GetProjectConversationsClient().CreateProjectConversation();
ProjectResponsesClient responsesClient = projectClient.ProjectOpenAIClient.GetProjectResponsesClientForAgent(
defaultAgent: agentName,
defaultConversationId: conversation.Id);
ResponseResult response = responsesClient.CreateResponse("Your prompt");
Baseline Chat App: https://github.com/Azure-Samples/microsoft-foundry-baseline
website/chatui/Controllers/ChatController.cs - SSE streaming patternBasic Chat Example: https://github.com/Azure-Samples/microsoft-foundry-basic
Semantic Kernel + Foundry: https://github.com/Azure-Samples/app-service-agentic-semantic-kernel-ai-foundry-agent
Azure AI Agents React Sample: https://github.com/Azure-Samples/get-started-with-ai-agents
This is the primary UI reference for this project. Many UI patterns were borrowed from here:
Agent Framework DevUI: https://github.com/microsoft/agent-framework/tree/main/python/packages/devui
Alternative UI patterns for agent development:
When implementing new UI features, check these sources in order:
get-started-with-ai-agents - React + TypeScript patterns for chat UIagent-framework/devui - Development UI patternsRepository: https://github.com/microsoft/semantic-kernel
Relevant paths:
dotnet/src/Agents/OpenAI/ - OpenAI Responses API integrationdotnet/samples/GettingStartedWithAgents/AzureAIAgent/dotnet/samples/Concepts/Agents/ (Step##_*.cs files)Repository: https://github.com/openai/openai-dotnet
docs/guides/streaming-responses/ - Streaming patternsStreamingResponseOutputTextDeltaUpdate and related typesUse GitHub search to find usage examples:
# Find streaming patterns
"StreamingResponseOutputTextDeltaUpdate language:csharp"
# Find Responses API usage
"ProjectResponsesClient CreateResponseStreamingAsync language:csharp"
# Find conversation patterns
"ProjectConversation GetProjectResponsesClientForAgent language:csharp"
| Package | Purpose |
|---|---|
Azure.AI.Projects | Main entry point, AIProjectClient, v2 Agents API, Responses API |
Azure.Identity | Authentication (AzureDeveloperCliCredential, ManagedIdentityCredential) |
Microsoft.Identity.Web | JWT Bearer authentication for API |
Note: Check WebApp.Api.csproj for current versions. This project requires Azure.AI.Projects GA with v2 Agents API support (AIProjectClient.AgentAdministrationClient).
Companion packages used:
Azure.AI.Projects.Agents — ProjectsAgentVersion, ProjectsAgentRecord, DeclarativeAgentDefinition / HostedAgentDefinition / WorkflowAgentDefinition, AgentAdministrationClientAzure.AI.Extensions.OpenAI — ProjectOpenAIClient, ProjectConversationsClient, ProjectResponsesClient, ProjectConversationOpenAI.Responses — streaming typesAgent Framework (Microsoft.Agents.AI.AzureAI): Not referenced. As of rc5, incompatible with Azure.AI.Projects 2.0.0 GA. See "Compatibility blocker" below.
Key Resources:
Start here when researching agent capabilities, limits, or new features:
Agent Framework (Microsoft.Agents) docs:
| Topic | URL |
|---|---|
| Agent Framework overview | https://learn.microsoft.com/microsoft-agents/overview |
| Agent Framework .NET SDK | https://github.com/microsoft/Agents-for-net |
| NuGet package | https://www.nuget.org/packages/Microsoft.Agents.AI.AzureAI |
| IChatClient abstraction | https://learn.microsoft.com/dotnet/api/microsoft.extensions.ai.ichatclient |
The SDK provides several annotation types for citations (from OpenAI.Responses namespace):
| Type | Class | Use Case | Key Properties |
|---|---|---|---|
| URI Citation | UriCitationMessageAnnotation | Bing, Azure AI Search, SharePoint | Uri, Title, StartIndex, EndIndex |
| File Citation | FileCitationMessageAnnotation | File search (vector stores) | FileId, Filename, Index |
| File Path | FilePathMessageAnnotation | Code interpreter output | FileId, Index |
| Container Citation | ContainerFileCitationMessageAnnotation | Container file citations | FileId, Filename, ContainerId, StartIndex, EndIndex |
Note: FileCitationMessageAnnotation uses Index (not StartIndex/EndIndex) per the SDK. See ExtractAnnotations() in AgentFrameworkService.cs for mapping to AnnotationInfo.
The C# SDK does not yet have a typed client for container file downloads. Use the REST API directly with a bearer token scoped to https://ai.azure.com/.default:
GET {projectEndpoint}/openai/v1/containers/{containerId}/files/{fileId}/content
Authorization: Bearer {token}
For standard (non-container) files (cfile_ prefix absent), use OpenAI.Files.FileClient instead. The backend endpoint GET /api/files/{fileId}?containerId={id} abstracts this: it routes cfile_-prefixed files through the REST API and standard files through FileClient.
| Type | Purpose |
|---|---|
StreamingResponseOutputTextDeltaUpdate | Text content delta chunks |
StreamingResponseOutputItemDoneUpdate | Item completion signals |
StreamingResponseCompletedUpdate | Response completion with usage |
ResponseItem | Base type for response items |
Pattern used in this project:
await foreach (var update in responsesClient.CreateResponseStreamingAsync(...))
{
if (update is StreamingResponseOutputTextDeltaUpdate textUpdate)
yield return new StreamChunk { Text = textUpdate.Delta };
if (update is StreamingResponseOutputItemDoneUpdate itemDone)
// Extract annotations from itemDone.Item
}
Package: Microsoft.Agents.AI.AzureAI (prerelease, not referenced)
Status: ❌ Not installed. Blocked on compatibility with Azure.AI.Projects 2.0.0 GA.
Microsoft.Agents.AI.AzureAI 1.0.0-rc5 pins Azure.AI.Projects 2.0.0-beta.2 and references types removed in the GA release. Attempting to use rc5 with Azure.AI.Projects 2.0.0 throws TypeLoadException at runtime. Re-evaluate when rc6+ ships.
Even when the compat blocker is lifted, this project's streaming path needs direct access to ProjectResponsesClient and typed response items that are not surfaced by the IChatClient abstraction:
McpToolCallApprovalRequestItem for MCP approval flowsFileSearchCallResponseItem for file search quotesMessageResponseItem.OutputTextAnnotations for citationsResponseItem.CreateMcpApprovalResponseItem() to respond to MCP approvalsRouting through ChatClientAgent.RunStreamingAsync() would require casting RawRepresentation for each of these, which defeats the abstraction benefit.
// Agent metadata — no "latest" keyword in the REST spec; enumerate versions descending.
ProjectsAgentVersion? agentVersion = null;
await foreach (var v in projectClient.AgentAdministrationClient.GetAgentVersionsAsync(
agentName: agentName,
limit: 1,
order: AgentListOrder.Descending,
after: null,
before: null,
cancellationToken: ct))
{
agentVersion = v;
break;
}
var definition = agentVersion?.Definition as DeclarativeAgentDefinition;
string model = definition?.Model ?? "";
string instructions = definition?.Instructions ?? "";
// Streaming — pin the resolved version so streaming hits the same version as metadata.
ProjectResponsesClient responsesClient = projectClient.ProjectOpenAIClient
.GetProjectResponsesClientForAgent(
new AgentReference(agentId, agentVersion?.Version),
conversationId);
await foreach (var update in responsesClient.CreateResponseStreamingAsync(...)) { }
AIProjectClient requires a project endpoint URI (not a connection string):
var projectClient = new AIProjectClient(new Uri(projectEndpoint), new DefaultAzureCredential());
Connection-string constructors are deprecated. See: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/ai/Azure.AI.Projects/AGENTS_MIGRATION_GUIDE.md
Type definitions live in these repos—read them directly:
Search across all .NET codebases for real-world usage:
"ProjectResponsesClient CreateResponseStreamingAsync" language:csharp
"StreamingResponseOutputTextDeltaUpdate" language:csharp
This finds how other projects use these APIs, revealing patterns and edge cases.
Use when SDK docs are outdated or incomplete — the DLLs are the ground truth.
Works even when dotnet build fails (loads from NuGet cache):
cd backend/WebApp.Api; dotnet restore
# Option A: Load from build output (requires successful build)
$asm = [Reflection.Assembly]::LoadFrom((Resolve-Path "bin/Debug/net10.0/Azure.AI.Projects.dll"))
# Option B: Load from NuGet cache (works even if build fails — use for pre-release migrations)
$dll = Get-ChildItem "$env:USERPROFILE\.nuget\packages\azure.ai.projects" -Recurse -Filter "Azure.AI.Projects.dll" | Select-Object -Last 1
$asm = [Reflection.Assembly]::LoadFrom($dll.FullName)
# Find types matching a pattern
$asm.GetExportedTypes() | Where-Object { $_.Name -like "*Streaming*" } | ForEach-Object { $_.FullName }
# Get method signatures with parameter details
$type = $asm.GetType("Azure.AI.Extensions.OpenAI.ProjectResponsesClient")
$type.GetMethods() | Where-Object { $_.Name -like "*Async*" } | Select-Object Name, ReturnType, @{N='Params';E={($_.GetParameters() | ForEach-Object { "$($_.ParameterType.Name) $($_.Name)" }) -join ', '}}
Agent Framework assemblies (for Microsoft.Agents.AI.AzureAI migrations):
# Load Agent Framework DLL from NuGet cache
$pkg = Get-ChildItem "$env:USERPROFILE\.nuget\packages\microsoft.agents.ai.azureai" -Recurse -Filter "Microsoft.Agents.AI.AzureAI.dll" | Select-Object -Last 1
$asm = [Reflection.Assembly]::LoadFrom($pkg.FullName)
# Dump all exported types to see what changed between versions
$asm.GetExportedTypes() | ForEach-Object { $_.FullName } | Sort-Object
# Check if types you depend on still exist
@("ChatClientAgent", "AgentVersion", "PromptAgentDefinition", "AgentReference") | ForEach-Object {
$match = $asm.GetExportedTypes() | Where-Object { $_.Name -eq $_ }
if ($match) { Write-Host "FOUND: $($match.FullName)" } else { Write-Host "MISSING: $_" -ForegroundColor Red }
}
# Inspect extension methods (GetAIAgentAsync, etc.)
$asm.GetExportedTypes() | Where-Object { $_.GetMethods([Reflection.BindingFlags]::Static -bor [Reflection.BindingFlags]::Public) | Where-Object { $_.IsDefined([Runtime.CompilerServices.ExtensionAttribute], $false) } } | ForEach-Object {
$_.GetMethods() | Where-Object { $_.IsDefined([Runtime.CompilerServices.ExtensionAttribute], $false) } | ForEach-Object { Write-Host "$($_.DeclaringType.Name).$($_.Name)" }
}
When to use: SDK upgrade with breaking changes, pre-release packages where docs lag, verifying actual API surface before writing migration code.
Key insight: Load from NuGet cache ($env:USERPROFILE\.nuget\packages\) to inspect the new version's types even when the build is broken.