Add a new Microsoft.Agents.AI.Templates package with an aiagent-webapi project template

[jeffhandley]

Introduces the new Microsoft.Agents.AI.Templates package that includes an aiagent-webapi project template. Snapshot tests and execution tests are added for verifying all of the currently supported options in the template.

❯ dotnet new aiagent-webapi -?
AI Agents Web API (C#)
Author: Microsoft
Description: A project template for creating an AI Agents Web API application.

Usage:
  dotnet new aiagent-webapi [options] [template options]

Options:
  -n, --name <name>       The name for the output being created. If no name is specified, the name of the output directory is used.
  -o, --output <output>   Location to place the generated output.
  --dry-run               Displays a summary of what would happen if the given command line were run if it would result in a template creation. [default: False]
  --force                 Forces content to be generated even if it would change existing files. [default: False]
  --no-update-check       Disables checking for the template package updates when instantiating a template. [default: False]
  --project <project>     The project that should be used for context evaluation.
  -lang, --language <C#>  Specifies the template language to instantiate.
  --type <project>        Specifies the template type to instantiate.

Template options:
  -f, --framework <net10.0|net8.0|net9.0>              The target framework for the project.
                                                       Type: choice
                                                         net10.0  Target net10.0
                                                         net9.0   Target net9.0
                                                         net8.0   Target net8.0
                                                       Default: net10.0
  --provider <azureopenai|githubmodels|ollama|openai>  Type: choice
                                                         azureopenai   Uses Azure OpenAI service
                                                         githubmodels  Uses GitHub Models
                                                         ollama        Uses Ollama with the llama3.2 model
                                                         openai        Uses the OpenAI Platform
                                                       Default: githubmodels
  --use-managed-identity                               Use managed identity to access Azure services
                                                       Enabled if: (AiServiceProvider == "azureopenai")
                                                       Type: bool
                                                       Default: true
  --chat-model <chat-model>                            Model/deployment for chat completions. Example: gpt-4o-mini
                                                       Type: string

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

This PR introduces the new Microsoft.Agents.AI.Templates package containing an aiagents-webapi project template for creating AI Agents Web API applications. The template supports multiple AI service providers (GitHub Models, OpenAI, Azure OpenAI, Ollama) with configurable options for authentication and models. The PR also refactors shared project template testing infrastructure to support both the new Agents templates and existing Extensions.AI templates.

Key changes:

• New aiagents-webapi template package with multi-provider support and managed identity authentication
• Refactored shared test infrastructure from Microsoft.Extensions.AI.Templates.Tests namespace to Microsoft.Shared.ProjectTemplates.Tests for reusability
• Comprehensive snapshot and execution tests validating all template configuration options

Reviewed Changes

Copilot reviewed 72 out of 81 changed files in this pull request and generated 12 comments.

File	Description
test/Shared/ProjectTemplates/*.cs	Namespace refactoring from Extensions.AI to shared namespace for test infrastructure reusability
test/ProjectTemplates/Microsoft.Agents.AI.Templates.IntegrationTests/*	New integration test project with snapshot and execution tests for aiagents-webapi template
src/ProjectTemplates/Microsoft.Agents.AI.Templates/*	New template package containing aiagents-webapi template with multi-provider support
src/ProjectTemplates/GeneratedContent.targets	Build configuration for generating template content with package version variables

[DeagleGross]

Should this have an option to attach to Aspire? Aspire helps to nicely define for example integration with AzureOpenAI / Foundry like here

[jeffhandley]

Should this have an option to attach to Aspire?

We'll add the Aspire option in a follow-up; might not land this week though.

[MackinnonBuck]

Looks great so far - just some initial thoughts about the template infrastructure.