# Azure Functions > Expert patterns for Azure Functions development including isolated worker model, Durable Functions orchestration, cold start optimization, and production patterns. Covers .NET, Python, and Node.js ... Use when this capability is needed. - Skill: `tomevault-io/azure-functions` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/azure-functions` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/azure-functions/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: DevOps & Infra - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/azure-functions --- # Azure Functions ## Patterns ### Isolated Worker Model (.NET) Modern .NET execution model with process isolation ### Node.js v4 Programming Model Modern code-centric approach for TypeScript/JavaScript ### Python v2 Programming Model Decorator-based approach for Python functions ## Anti-Patterns ### ❌ Blocking Async Calls ### ❌ New HttpClient Per Request ### ❌ In-Process Model for New Projects ## ⚠️ Sharp Edges | Issue | Severity | Solution | |-------|----------|----------| | Issue | high | ## Use async pattern with Durable Functions | | Issue | high | ## Use IHttpClientFactory (Recommended) | | Issue | high | ## Always use async/await | | Issue | medium | ## Configure maximum timeout (Consumption) | | Issue | high | ## Use isolated worker for new projects | | Issue | medium | ## Configure Application Insights properly | | Issue | medium | ## Check extension bundle (most common) | | Issue | medium | ## Add warmup trigger to initialize your code | --- > Source: [yunaamelia/apex-fast](https://github.com/yunaamelia/apex-fast) — distributed by [TomeVault](https://tomevault.io).