compute_vm_create: Update default VM size from Standard_DS1_v2 to Standard_D2s_v5

[haagha]

What does this PR do?

This PR changes the default size of VM and VMSS creation from Standard_DS1_v2 to Standard_D2s_v5
This PR will also fixes bugs relating to VMSS update options binding.

GitHub issue number?

#2244

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
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  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
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• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates Azure Compute tool defaults to use a newer VM size and fixes option parsing so vmss update can accept capacity and related tri-state flags.

Changes:

• Change default VM size for vm create / vmss create from Standard_DS1_v2 to Standard_D2s_v5 across service logic, tests, and docs.
• Fix VMSS update option typing by making --capacity, --overprovision, and --enable-auto-os-upgrade nullable to distinguish “not provided” vs “set”.
• Add changelog entries and update server docs/e2e prompts to reflect the new defaults.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.Compute/tests/Azure.Mcp.Tools.Compute.UnitTests/Vmss/VmssUpdateCommandTests.cs	Adds a new validation case for --capacity in vmss update.
tools/Azure.Mcp.Tools.Compute/tests/Azure.Mcp.Tools.Compute.UnitTests/Vmss/VmssCreateCommandTests.cs	Updates expected VMSS default size to Standard_D2s_v5.
tools/Azure.Mcp.Tools.Compute/tests/Azure.Mcp.Tools.Compute.UnitTests/Vm/VmCreateCommandTests.cs	Updates expected VM default size to Standard_D2s_v5.
tools/Azure.Mcp.Tools.Compute/tests/Azure.Mcp.Tools.Compute.LiveTests/ComputeCommandTests.cs	Updates live test assertions for VM size.
tools/Azure.Mcp.Tools.Compute/src/Services/ComputeService.cs	Changes default VM size constant and related comments.
tools/Azure.Mcp.Tools.Compute/src/Options/ComputeOptionDefinitions.cs	Updates help text and makes VMSS update options nullable.
tools/Azure.Mcp.Tools.Compute/src/ComputeSetup.cs	Updates tool description default-size text.
tools/Azure.Mcp.Tools.Compute/src/Commands/Vmss/VmssCreateCommand.cs	Updates command description default-size text.
tools/Azure.Mcp.Tools.Compute/src/Commands/Vm/VmCreateCommand.cs	Updates command description default-size text.
servers/Azure.Mcp.Server/docs/e2eTestPrompts.md	Updates e2e prompt to the new default size.
servers/Azure.Mcp.Server/docs/azmcp-commands.md	Updates docs for default size for VM and VMSS create.
servers/Azure.Mcp.Server/changelog-entries/1776182026573.yaml	Adds changelog entry for VMSS update option fix.
servers/Azure.Mcp.Server/changelog-entries/1775768065287.yaml	Adds changelog entry for default VM size change.
eng/tools/ToolDescriptionEvaluator/prompts/namespace-tools.json	Updates evaluator prompt tool description default-size text.

[jongio]

Heads up: the PR description says "Standard_DS2_v2" but the actual change is to Standard_D2s_v5 - looks like a typo that could confuse reviewers.

The option type fix (Option<int> to Option<int?> and Option<bool> to Option<bool?>) is correct - the service layer already expected nullable types, and non-nullable options default to 0/false making it impossible to distinguish "not provided" from "explicitly set to default." Good catch.

The Copilot bot already flagged the missing test cases for --overprovision and --enable-auto-os-upgrade - that's worth addressing since the changelog claims all three options are fixed.