Add Azure Device Registry tool to Azure MCP Server

[nimengan]

What does this PR do?

Adds a new Azure.Mcp.Tools.DeviceRegistry toolset with the deviceregistry_namespace_list command, which lists Azure Device Registry namespaces in a specified subscription and optional resource group

[Any additional context, screenshots, or information that helps reviewers]

GitHub issue number?

#1962

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Updated servers/Azure.Mcp.Server/CHANGELOG.md and/or servers/Fabric.Mcp.Server/CHANGELOG.md for product changes (features, bug fixes, UI/UX, updated dependencies)
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes using script at eng/scripts/Process-PackageReadMe.ps1. See Package README
  • Updated command list in /servers/Azure.Mcp.Server/docs/azmcp-commands.md and/or /docs/fabric-commands.md
  • Run .\eng\scripts\Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated test prompts in /servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

[Copilot]

Pull request overview

Adds a new Azure Device Registry tool area to the Azure MCP Server, introducing a first command to list Device Registry namespaces via the server’s command/tool framework.

Changes:

• Introduces new Azure.Mcp.Tools.DeviceRegistry tool project with deviceregistry namespace list command and supporting service/models.
• Adds unit tests + live/recorded-test scaffolding and test resource deployment templates for the new tool.
• Wires the tool into Azure MCP Server registration and documentation/metadata (docs, consolidated tools, CODEOWNERS, solutions, packages, changelog entry).

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.DeviceRegistry/src/Azure.Mcp.Tools.DeviceRegistry.csproj	New tool project with dependencies and AOT compatibility setting.
tools/Azure.Mcp.Tools.DeviceRegistry/src/GlobalUsings.cs	Adds project-wide System.CommandLine global using.
tools/Azure.Mcp.Tools.DeviceRegistry/src/AssemblyInfo.cs	Exposes internals to unit/live test assemblies.
tools/Azure.Mcp.Tools.DeviceRegistry/src/DeviceRegistrySetup.cs	Registers DI services and command groups for the new area.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Commands/BaseDeviceRegistryCommand.cs	Base command type for Device Registry commands (subscription-based).
tools/Azure.Mcp.Tools.DeviceRegistry/src/Commands/DeviceRegistryJsonContext.cs	Source-generated System.Text.Json context for tool payloads.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Commands/Namespace/NamespaceListCommand.cs	Implements the namespace list command and tool response shaping.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Models/DeviceRegistryNamespaceInfo.cs	Output model for namespace list results.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Options/BaseDeviceRegistryOptions.cs	Base options for Device Registry commands (subscription).
tools/Azure.Mcp.Tools.DeviceRegistry/src/Options/DeviceRegistryOptionDefinitions.cs	Adds a --namespace option definition (for future commands).
tools/Azure.Mcp.Tools.DeviceRegistry/src/Options/Namespace/NamespaceListOptions.cs	Options type for namespace list command.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Services/IDeviceRegistryService.cs	Service contract for namespace listing.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Services/DeviceRegistryService.cs	Resource Graph-backed implementation for listing namespaces.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Services/Models/DeviceRegistryNamespaceData.cs	Resource Graph deserialization models.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/Azure.Mcp.Tools.DeviceRegistry.UnitTests/Azure.Mcp.Tools.DeviceRegistry.UnitTests.csproj	New unit test project for the tool.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/Azure.Mcp.Tools.DeviceRegistry.UnitTests/Namespace/NamespaceListCommandTests.cs	Unit tests for namespace list behavior and error handling.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/Azure.Mcp.Tools.DeviceRegistry.LiveTests/Azure.Mcp.Tools.DeviceRegistry.LiveTests.csproj	New live/recorded test project for server-integrated tool invocation.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/Azure.Mcp.Tools.DeviceRegistry.LiveTests/assets.json	Recording assets configuration for externalized recordings.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/Azure.Mcp.Tools.DeviceRegistry.LiveTests/DeviceRegistryCommandTests.cs	Live tests invoking deviceregistry_namespace_list.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/test-resources.bicep	Deploys Device Registry namespace + RBAC for test principal.
tools/Azure.Mcp.Tools.DeviceRegistry/tests/test-resources-post.ps1	Post-deploy script for test resource deployment.
servers/Azure.Mcp.Server/src/Program.cs	Registers the new Device Registry area setup.
servers/Azure.Mcp.Server/src/Resources/consolidated-tools.json	Adds consolidated tool mapping for Device Registry namespace listing.
servers/Azure.Mcp.Server/docs/azmcp-commands.md	Documents the new azmcp deviceregistry namespace list CLI command.
servers/Azure.Mcp.Server/docs/e2eTestPrompts.md	Adds e2e prompts for the new tool.
servers/Azure.Mcp.Server/changelog-entries/1772227057670.yaml	Adds changelog entry for the new command.
Directory.Packages.props	Introduces Azure.ResourceManager.DeviceRegistry package version pin.
servers/Azure.Mcp.Server/Azure.Mcp.Server.slnx	Adds DeviceRegistry projects to the server solution filter.
Microsoft.Mcp.slnx	Adds DeviceRegistry projects to the root solution filter.
.github/CODEOWNERS	Adds code ownership rules for the new tool directory.