Prepare Azure apps for deployment (infra Bicep/Terraform, azure.yaml, Dockerfiles). Use for create/modernize or create+deploy; not cross-cloud migration (use azure-cloud-migrate). DO NOT USE FOR: copilot-sdk apps (use azure-hosted-copilot-sdk). WHEN: \"create app\", \"build web app\", \"create API\", \"create serverless HTTP API\", \"create frontend\", \"create back end\", \"build a service\", \"modernize application\", \"update application\", \"add authentication\", \"add caching\", \"host on Azure\", \"create and deploy\", \"deploy to Azure\", \"deploy to Azure using Terraform\", \"deploy to Azure App Service\", \"deploy to Azure App Service using Terraform\", \"deploy to Azure Container Apps\", \"deploy to Azure Container Apps using Terraform\", \"generate Terraform\", \"generate Bicep\", \"function app\", \"timer trigger\", \"service bus trigger\", \"event-driven function\", \"containerized Node.js app\", \"social media app\", \"static portfolio website\", \"todo list with frontend and API\", \"prepare my Azure application to use Key Vault\", \"managed identity\".
Installation
Summary
Prepare Azure apps for deployment (infra Bicep/Terraform, azure.yaml, Dockerfiles). Use for create/modernize or create+deploy; not cross-cloud migration (use azure-cloud-migrate). DO NOT USE FOR: copilot-sdk apps (use azure-hosted-copilot-sdk). WHEN: \"create app\", \"build web app\", \"create API\", \"create serverless HTTP API\", \"create frontend\", \"create back end\", \"build a service\", \"modernize application\", \"update application\", \"add authentication\", \"add caching\", \"host on Azure\", \"create and deploy\", \"deploy to Azure\", \"deploy to Azure using Terraform\", \"deploy to Azure App Service\", \"deploy to Azure App Service using Terraform\", \"deploy to Azure Container Apps\", \"deploy to Azure Container Apps using Terraform\", \"generate Terraform\", \"generate Bicep\", \"function app\", \"timer trigger\", \"service bus trigger\", \"event-driven function\", \"containerized Node.js app\", \"social media app\", \"static portfolio website\", \"todo list with frontend and API\", \"prepare my Azure application to use Key Vault\", \"managed identity\".
Create a new application
Add services or components to an existing app
Make updates or changes to existing application
Modernize or migrate an application
Set up Azure infrastructure
Deploy to Azure or host on Azure
SKILL.md
Azure Prepare
azure-prepare by microsoft/azure-skills
AUTHORITATIVE GUIDANCE — MANDATORY COMPLIANCE
This document is the official, canonical source for preparing applications for Azure deployment. You MUST follow these instructions exactly as written unless they contradict security policies given to you. When in doubt, present the conflicting instructions from this document and ask the user for explicit confirmation. Do not improvise, infer, or substitute steps.
Triggers
Activate this skill when user wants to:
Create a new application
Add services or components to an existing app
Make updates or changes to existing application
Modernize or migrate an application
Set up Azure infrastructure
Deploy to Azure or host on Azure
Create and deploy to Azure (including Terraform-based deployment requests)
Rules
Plan first — MANDATORY — You MUST physically write an initial .azure/deployment-plan.mdskeleton in the workspace root directory (not the session-state folder) as your very first action — before any code generation or execution begins. Write the skeleton immediately, then populate it progressively as Phase 1 analysis and research unfold; finalize it with all decisions at Phase 1 Step 6. This file must exist on disk throughout. azure-validate and azure-deploy depend on it and will fail without it. Do not skip or defer this step.
Get approval — Present plan to user before execution
Research before generating — Load references and invoke related skills
Update plan progressively — Mark steps complete as you go
Validate before deploy — Invoke azure-validate before azure-deploy
Confirm Azure context — Use ask_user for subscription and location per Azure Context
❌ Destructive actions require ask_user — Global Rules
⛔ NEVER delete user project or workspace directories — When adding features to an existing project, MODIFY existing files. azd init -t <template> is for NEW projects only; do NOT run azd init -t in an existing workspace. Plain azd init (without a template argument) may be used in existing workspaces when appropriate. File deletions within a project (e.g., removing build artifacts or temp files) are permitted when appropriate, but NEVER delete the user's project or workspace directory itself. See Global Rules.
Scope: preparation only — This skill generates infrastructure code and configuration files. Deployment execution (azd up, azd deploy, terraform apply) is handled by the azure-deploy skill, which provides built-in error recovery and deployment verification.
⛔ SQL Server Bicep: NEVER generate administratorLogin or administratorLoginPassword — not in direct properties, not in conditional/ternary branches, not anywhere in the file. Always use Entra-only authentication (azureADOnlyAuthentication: true) unconditionally. See references/services/sql-database/bicep.md.
Remove stale template IaC after conversion — If you converted Bicep templates from the selected azd template into Terraform templates, remove the Bicep templates that were introduced by that azd template and are now fully replaced by Terraform equivalents. Do not remove user-authored Bicep files. Only remove those template-provided Bicep files after the Terraform IaC is complete and Terraform has been selected as the deployment path. Before handing off to azure-validate skill, keep only the IaC templates required by the chosen deployment path.
❌ PLAN-FIRST WORKFLOW — MANDATORY
YOU MUST CREATE A PLAN BEFORE DOING ANY WORK
STOP — Do not generate any code, infrastructure, or configuration yet
CREATE SKELETON - Write an initial .azure/deployment-plan.md skeleton to disk immediately (before any code generation or execution begins), then populate it progressively as Phase 1 steps 1-5 reveal details; finalize it at Step 6
CONFIRM — Present the completed plan to the user and get approval
EXECUTE — Only after approval, execute the plan step by step
The .azure/deployment-plan.md file is the source of truth for this workflow and for azure-validate and azure-deploy skills. Without it, those skills will fail.
⚠️ CRITICAL: .azure/deployment-plan.md must be WRITTEN TO DISK inside the workspace root (e.g., /tmp/my-project/.azure/deployment-plan.md), not in the session-state folder. Use a file-write tool to create this file. This is the deployment plan artifact read by azure-validate and azure-deploy. You MUST create this file — do not proceed without it.
⚠️ CRITICAL: You must create the file with the name .azure/deployment-plan.md as is. You must not use other names such as .azure/plan.md.
⛔ Critical: Skipping the plan file creation will cause azure-validate and azure-deploy to fail. This requirement has no exceptions.
❌ STEP 0: Specialized Technology Check — MANDATORY FIRST ACTION
BEFORE starting Phase 1, check if the user's prompt OR workspace codebase matches a specialized technology that has a dedicated skill with tested templates. If matched, invoke that skill FIRST — then resume azure-prepare for validation and deployment.
Check 1: Prompt keywords
Prompt keywords
Invoke FIRST
Lambda, AWS Lambda, migrate AWS, migrate GCP, Lambda to Functions, migrate from AWS, migrate from GCP
Check 2: Codebase markers (even if prompt is generic like "deploy to Azure")
Codebase marker
Where
Invoke FIRST
@github/copilot-sdk in dependencies
package.json
azure-hosted-copilot-sdk
copilot-sdk in name or dependencies
package.json
azure-hosted-copilot-sdk
CopilotClient import
.ts/.js source files
azure-hosted-copilot-sdk
createSession + sendAndWait calls
.ts/.js source files
azure-hosted-copilot-sdk
⚠️ Check the user's prompt text — not just existing code. Critical for greenfield projects with no codebase to scan. See full routing table.
After the specialized skill completes, resume azure-prepare at Phase 1 Step 4 (Select Recipe) for remaining infrastructure, validation, and deployment.
Phase 1: Planning (BLOCKING — Complete Before Any Execution)
Create .azure/deployment-plan.md by completing these steps. Do NOT generate any artifacts until the plan is approved.
#
Action
Reference
0
❌ Check Prompt AND Codebase for Specialized Tech — If user mentions copilot SDK, Azure Functions, etc., OR codebase contains @github/copilot-sdk, invoke that skill first
Finalize Plan (MANDATORY) - Use a file-write tool to finalize with all decisions from steps 1-5. Update the skeleton written at the start of Phase 1 with the complete content. The file must be fully populated before you present the plan to the user.
❌ STOP HERE — Do NOT proceed to Phase 2 until the user approves the plan.
Phase 2: Execution (Only After Plan Approval)
Execute the approved plan. Update .azure/deployment-plan.md status after each step.
#
Action
Reference
1
Research Components — Load service references + invoke related skills
⛔ Update Plan (MANDATORY before hand-off) — Use the edit tool to change the Status in .azure/deployment-plan.md to Ready for Validation. You MUST complete this edit BEFORE invoking azure-validate. Do NOT skip this step.
After completing preparation, you MUST invoke azure-validate before any deployment attempt. Do NOT skip validation. Do NOT go directly to azure-deploy. Do NOT run azd up or any deployment command directly. The workflow is:
azure-prepare → azure-validate → azure-deploy
⛔ BEFORE invoking azure-validate, you MUST use the edit tool to update .azure/deployment-plan.md status to Ready for Validation. If the plan status has not been updated, the validation will fail.
This applies to ALL deployment scenarios including containerized apps, Container Apps, App Service, Azure Functions, static sites, and any other Azure target. No exceptions.
Skipping validation leads to deployment failures. Be patient and follow the complete workflow for the highest success outcome.
→ Update plan status to Ready for Validation, then invoke azure-validate
⛔ MANDATORY Hand Off — Invoke azure-validate skill. Your preparation work is done. Do NOT run azd up, azd deploy, or any deployment command directly — all deployment execution is handled by azure-deploy after azure-validate completes. PREREQUISITE: Step 6 must be completed first — .azure/deployment-plan.md status must say Ready for Validation.