roslyn

Install and validate a .NET SDK from an Azure DevOps internal build. Use this when asked to install, validate, or set up a .NET SDK from a dnceng/internal Azure DevOps build link or build ID.

Review code changes in dotnet/roslyn for correctness, performance, and consistency with project conventions. Use when reviewing PRs or code changes.

Update the agent knowledge base after making code changes in the Roslyn repo. Run at the end of every task that modifies code, adds files, changes public APIs or diagnostics, or establishes new patterns. Keeps .github/memory/ fresh and reliable.

Create or modify Roslyn IDE analyzers, code fixes, and code refactorings. Use when: adding a new IDE diagnostic (IDE0xxx), implementing a CodeFixProvider, implementing a CodeRefactoringProvider, writing analyzer/fixer tests, or working with AbstractBuiltInCodeStyleDiagnosticAnalyzer. Also use for: diagnostic analyzer, code action, FixAllProvider, TestInRegularAndScriptAsync, TestMissingInRegularAndScriptAsync.

Perform a branch snap (release branch cut) for dotnet repos like dotnet/roslyn. Use when: snapping a branch, cutting a release branch, creating a release branch, merging main into release, updating VS insertion config, updating darc subscriptions for a snap, moving milestones, or asked about snap workflow.

Import Razor formatting log zips that the user has already downloaded from Azure DevOps feedback tickets or GitHub issues into FormattingLogTest, validate whether the captured problem still reproduces, and if needed drive a minimal repro plus fix workflow.

Set up tracking for a new C# compiler feature: create test plan issue, feature label, update Language Feature Status page, and link related PRs. Use when: setting up a new language feature, creating a test plan, tracking a new csharplang proposal in roslyn, or asked to 'set up feature tracking'.

Run the razor-toolset-ci pipeline to validate the current branch against large third-party repositories (MudBlazor, OrchardCore, ASP.NET Core, etc.). Use when asked to run toolset tests, ecosystem tests, or third-party validation.

Create a merge branch from a chosen base, merge a chosen source/upstream branch into it, resolve common Roslyn conflicts (`.xlf`, `.resx`, compiler codegen), and summarize the resolutions.

Analyze CI build and test status from Azure DevOps and Helix for dotnet repository PRs. Use when checking CI status, investigating failures, determining if a PR is ready to merge, or given URLs containing dev.azure.com or helix.dot.net. Also use when asked "why is CI red", "test failures", "retry CI", "rerun tests", "is CI green", "build failed", "checks failing", or "flaky tests".

Investigate Visual Studio integration test failures from Azure DevOps builds. Use when investigating integration test timeouts, crashes, or failures in the roslyn-integration-CI pipeline. Also use when asked "why are integration tests failing", "integration test timeout", "VS integration tests", or given AzDO build URLs from the roslyn-integration-CI pipeline.

Analyze VMR codeflow PR status for dotnet repositories. Use when investigating stale codeflow PRs, checking if fixes have flowed through the VMR pipeline, debugging dependency update issues in PRs authored by dotnet-maestro[bot], checking overall flow status for a repo, or diagnosing why backflow PRs are missing or blocked.