docs(architect): weekly KB update — 106 files refreshed (2026-04)

Updates across all 5 skills: ms-ai-advisor, ms-ai-engineering,
ms-ai-governance, ms-ai-security, ms-ai-infrastructure.

Key changes:
- Language Services (Custom Text Classification, Text Analytics, QnA):
  retirement warning 2029-03-31, migration guides to Foundry/GPT-4o
- Agentic Retrieval: 50M free reasoning tokens/month (Public Preview)
- Computer Use: Claude Sonnet 4.5 (preview) + OpenAI CUA models
- Agent Registry: Risks column (M365 E7), user-shared/org-published types
- Declarative agents: schema v1.5 → v1.6, Store validation requirements
- MLflow 3: 13 built-in LLM judges, production monitoring, Genie Code
- AG-UI HITL: ApprovalRequiredAIFunction (C#) + @tool(approval_mode) (Python)
- Entra ID Ignite 2025: Agent ID Admin/Developer RBAC roles, Conditional Access
- Security Copilot: 400 SCU/month per 1000 M365 E5 licenses, auto-provisioned
- Fast Transcription API: phrase lists, 14-language multi-lingual transcription
- Azure Monitor Workbooks: Bicep support, RBAC specifics
- Power Platform Copilot: data residency (Norway/Europe → EU DB, Bing → USA)
- RAG security-rbac: 4-approach table (GA + 3 preview access control methods)
- IaC MLOps: Well-Architected OE:05 principles, Bicep/Terraform patterns
- Translator: image file batch translation Preview (JPEG/PNG/BMP/WebP)

All 106 files: Last updated 2026-04 | Verified: MCP 2026-04

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

skills/ms-ai-engineering/references/agent-orchestration/tool-use-and-function-calling-patterns.md

@@ -1,6 +1,6 @@
 # Tool Use and Function Calling - Advanced Patterns
 
-**Last updated:** 2026-02
+**Last updated:** 2026-04 | Verified: MCP 2026-04
 **Status:** GA
 **Category:** Agent Orchestration & Automation
 
@@ -207,19 +207,35 @@ var result = await mainAgent.RunAsync("Hvordan er været i Oslo?");
 
 **Implementering (AG-UI + Agent Framework):**
 
-```python
-# AG-UI middleware for approval
-def approval_middleware(tool_call):
-    if tool_call.name in ["delete_record", "send_email"]:
-        user_response = input(f"Approve {tool_call.name}? (yes/no): ")
-        return user_response.lower() == "yes"
-    return True  # Auto-approve andre funksjoner
+AG-UI backend tool rendering stoetter HITL via to mekanismer:
 
-# Agent med approval-workflow
-agent = ChatAgent(chat_client=client, tools=[delete_record, send_email])
-# Koble approval_middleware til agent runtime
+**C# - ApprovalRequiredAIFunction:**
+```csharp
+// Tool som krever human approval
+var approvalTool = ApprovalRequiredAIFunction.Create(DeleteRecord);
+
+// Workflow emitter RequestInfoEvent med ToolApprovalRequestContent
+await foreach (var evt in workflow.WatchStreamAsync()) {
+    if (evt is RequestInfoEvent req && req.Data is ToolApprovalRequestContent tc) {
+        bool approved = await AskUserApproval(tc.ToolName);
+        await handle.SendResponseAsync(req.Request.CreateResponse(approved));
+    }
+}
 ```
 
+**Python - @tool med approval_mode:**
+```python
+@tool(approval_mode="always_require")
+def delete_record(record_id: str) -> str:
+    # Sletter en post - krever alltid menneskelig godkjenning
+    return db.delete(record_id)
+
+# Workflow pauser og emitter function_approval_request event
+# Klient-loop maa haandtere og respondere
+```
+
+**Backend tool events streames til klient i sanntid:** TOOL_CALL_START, TOOL_CALL_ARGS, TOOL_CALL_END, TOOL_CALL_RESULT.
+
 ---
 
 ## Beslutningsveiledning
@@ -412,7 +428,7 @@ def update_citizen_record(ssn: str, field: str, value: str) -> str:
 1. [Azure OpenAI Function Calling](https://learn.microsoft.com/en-us/azure/ai-foundry/openai/how-to/function-calling) — **Verified 2026-02**
 2. [Semantic Kernel Agent Functions](https://learn.microsoft.com/en-us/semantic-kernel/frameworks/agent/agent-functions) — **Verified 2026-02**
 3. [Agent Framework - Agent as Function Tool](https://learn.microsoft.com/en-us/agent-framework/tutorials/agents/agent-as-function-tool) — **Verified 2026-02**
-4. [AG-UI Backend Tool Rendering](https://learn.microsoft.com/en-us/agent-framework/integrations/ag-ui/backend-tool-rendering) — **Verified 2026-02**
+4. [AG-UI Backend Tool Rendering](https://learn.microsoft.com/en-us/agent-framework/integrations/ag-ui/backend-tool-rendering) — **Verified 2026-04** (backend tool streaming, ApprovalRequiredAIFunction C#, @tool(approval_mode) Python, TOOL_CALL_* events)
 5. [Azure OpenAI Assistants Function Calling](https://learn.microsoft.com/en-us/azure/ai-foundry/openai/how-to/assistant-functions) — **Verified 2026-02**
 6. [Structured Outputs](https://learn.microsoft.com/en-us/azure/ai-foundry/openai/how-to/structured-outputs) — **Verified 2026-02**