[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-dotnet-migrate-dotnet9-to-dotnet10":3,"mdc-bslc44-key":31,"related-repo-dotnet-migrate-dotnet9-to-dotnet10":3147,"related-org-dotnet-migrate-dotnet9-to-dotnet10":3258},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":19,"repoUrl":20,"updatedAt":21,"license":22,"forks":23,"topics":24,"repo":26,"sourceUrl":29,"mdContent":30},"migrate-dotnet9-to-dotnet10","migrate .NET 9 projects to .NET 10","Migrate a .NET 9 project or solution to .NET 10 and resolve all breaking changes. USE FOR: upgrading TargetFramework from net9.0 to net10.0, fixing build errors after updating the .NET 10 SDK, resolving source and behavioral changes in .NET 10 \u002F C# 14 \u002F ASP.NET Core 10 \u002F EF Core 10, updating Dockerfiles for Debian-to-Ubuntu base images, resolving obsoletion warnings (SYSLIB0058-SYSLIB0062), adapting to SDK\u002FNuGet changes (NU1510, PrunePackageReference), migrating System.Linq.Async to built-in AsyncEnumerable, fixing OpenApi v2 API changes, cryptography renames, and C# 14 compiler changes (field keyword, extension keyword, span overloads). DO NOT USE FOR: .NET Framework migrations, upgrading from .NET 8 or earlier (use migrate-dotnet8-to-dotnet9 first), greenfield .NET 10 projects, or cosmetic modernization. LOADS REFERENCES: csharp-compiler, core-libraries, sdk-msbuild (always); aspnet-core, efcore, cryptography, extensions-hosting, serialization-networking, winforms-wpf, containers-interop (selective).\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},"dotnet",".NET (Microsoft)","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Fdotnet.png",[12,16],{"name":13,"slug":14,"type":15},"Migration","migration","tag",{"name":17,"slug":18,"type":15},"Engineering","engineering",4576,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fskills","2026-07-12T08:22:59.092291","MIT",332,[25],"agent-skills",{"repoUrl":20,"stars":19,"forks":23,"topics":27,"description":28},[25],"Repository for skills to assist AI coding agents with .NET and C#","https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fskills\u002Ftree\u002FHEAD\u002Fplugins\u002Fdotnet-upgrade\u002Fskills\u002Fmigrate-dotnet9-to-dotnet10","---\nname: migrate-dotnet9-to-dotnet10\ndescription: >\n  Migrate a .NET 9 project or solution to .NET 10 and resolve all breaking changes.\n  USE FOR: upgrading TargetFramework from net9.0 to net10.0, fixing build errors\n  after updating the .NET 10 SDK, resolving source and behavioral changes in\n  .NET 10 \u002F C# 14 \u002F ASP.NET Core 10 \u002F EF Core 10, updating Dockerfiles for\n  Debian-to-Ubuntu base images, resolving obsoletion warnings\n  (SYSLIB0058-SYSLIB0062), adapting to SDK\u002FNuGet changes (NU1510,\n  PrunePackageReference), migrating System.Linq.Async to built-in\n  AsyncEnumerable, fixing OpenApi v2 API changes, cryptography renames, and\n  C# 14 compiler changes (field keyword, extension keyword, span overloads).\n  DO NOT USE FOR: .NET Framework migrations, upgrading from .NET 8 or earlier\n  (use migrate-dotnet8-to-dotnet9 first), greenfield .NET 10 projects, or\n  cosmetic modernization.\n  LOADS REFERENCES: csharp-compiler, core-libraries, sdk-msbuild (always);\n  aspnet-core, efcore, cryptography, extensions-hosting,\n  serialization-networking, winforms-wpf, containers-interop (selective).\nlicense: MIT\n---\n\n# .NET 9 → .NET 10 Migration\n\nMigrate a .NET 9 project or solution to .NET 10, systematically resolving all breaking changes. The outcome is a project targeting `net10.0` that builds cleanly, passes tests, and accounts for every behavioral, source-incompatible, and binary-incompatible change introduced in the .NET 10 release.\n\n## When to Use\n\n- Upgrading `TargetFramework` from `net9.0` to `net10.0`\n- Resolving build errors or new warnings after updating the .NET 10 SDK\n- Adapting to behavioral changes in .NET 10 runtime, ASP.NET Core 10, or EF Core 10\n- Updating CI\u002FCD pipelines, Dockerfiles, or deployment scripts for .NET 10\n- Migrating from the community `System.Linq.Async` package to the built-in `System.Linq.AsyncEnumerable`\n\n## When Not to Use\n\n- The project already targets `net10.0` and builds cleanly — migration is done\n- Upgrading from .NET 8 or earlier — use the `migrate-dotnet8-to-dotnet9` skill first to reach `net9.0`, then return to this skill for the `net9.0` → `net10.0` migration\n- Migrating from .NET Framework — that is a separate, larger effort\n- Greenfield projects that start on .NET 10 (no migration needed)\n\n## Inputs\n\n| Input | Required | Description |\n|-------|----------|-------------|\n| Project or solution path | Yes | The `.csproj`, `.sln`, or `.slnx` entry point to migrate |\n| Build command | No | How to build (e.g., `dotnet build`, a repo build script). Auto-detect if not provided |\n| Test command | No | How to run tests (e.g., `dotnet test`). Auto-detect if not provided |\n| Project type hints | No | Whether the project uses ASP.NET Core, EF Core, WinForms, WPF, containers, etc. Auto-detect from PackageReferences and SDK attributes if not provided |\n\n## Workflow\n\n> **Answer directly from the loaded reference documents.** Do not search the filesystem or fetch web pages for breaking change information — the references contain the authoritative details. Focus on identifying which breaking changes apply and providing concrete fixes. **Exception:** If you suspect a security vulnerability (CVE) may apply to the project's dependencies, check for published security advisories — the reference documents may not cover post-publication CVEs.\n>\n> **Commit strategy:** Commit at each logical boundary — after updating the TFM (Step 2), after resolving build errors (Step 3), after addressing behavioral changes (Step 4), and after updating infrastructure (Step 5). This keeps each commit focused and reviewable.\n\n### Step 1: Assess the project\n\n1. Identify how the project is built and tested. Look for build scripts, `.sln`\u002F`.slnx` files, or individual `.csproj` files.\n2. Run `dotnet --version` to confirm the .NET 10 SDK is installed. If it is not, stop and inform the user.\n3. Determine which technology areas the project uses by examining:\n   - **SDK attribute**: `Microsoft.NET.Sdk.Web` → ASP.NET Core; `Microsoft.NET.Sdk.WindowsDesktop` with `\u003CUseWPF>` or `\u003CUseWindowsForms>` → WPF\u002FWinForms\n   - **PackageReferences**: `Microsoft.EntityFrameworkCore.*` → EF Core; `Microsoft.Data.Sqlite` → Sqlite; `Microsoft.Extensions.Hosting` → Generic Host \u002F BackgroundService\n   - **Dockerfile presence** → Container changes relevant\n   - **P\u002FInvoke or native interop usage** → Interop changes relevant\n   - **`System.Linq.Async` package reference** → AsyncEnumerable migration needed\n   - **`System.Text.Json` usage with polymorphism** → Serialization changes relevant\n4. Record which reference documents are relevant (see the reference loading table in Step 3).\n5. Do a **clean build** (`dotnet build --no-incremental` or delete `bin`\u002F`obj`) on the current `net9.0` target to establish a clean baseline. Record any pre-existing warnings.\n\n### Step 2: Update the Target Framework\n\n1. In each `.csproj` (or `Directory.Build.props` if centralized), change:\n   ```xml\n   \u003CTargetFramework>net9.0\u003C\u002FTargetFramework>\n   ```\n   to:\n   ```xml\n   \u003CTargetFramework>net10.0\u003C\u002FTargetFramework>\n   ```\n   For multi-targeted projects, add `net10.0` to `\u003CTargetFrameworks>` or replace `net9.0`.\n\n2. Update all `Microsoft.Extensions.*`, `Microsoft.AspNetCore.*`, `Microsoft.EntityFrameworkCore.*`, and other Microsoft package references to their 10.0.x versions. If using Central Package Management (`Directory.Packages.props`), update versions there.\n\n3. Run `dotnet restore`. Watch for:\n   - **NU1510**: Direct references pruned by NuGet — the package may be included in the shared framework now. Remove the explicit `\u003CPackageReference>` if so.\n   - **PackageReference without a version now raises an error** — every `\u003CPackageReference>` must have a `Version` (or use CPM).\n   - **NuGet auditing of transitive packages** (`dotnet restore` now audits transitive deps) — review any new vulnerability warnings.\n\n4. Run a clean build. Collect all errors and new warnings. These will be addressed in Step 3.\n\n### Step 3: Resolve build errors and source-incompatible changes\n\nWork through compilation errors and new warnings systematically. Load the appropriate reference documents based on the project type:\n\n| If the project uses… | Load reference |\n|-----------------------|----------------|\n| Any .NET 10 project | `references\u002Fcsharp-compiler-dotnet9to10.md` |\n| Any .NET 10 project | `references\u002Fcore-libraries-dotnet9to10.md` |\n| Any .NET 10 project | `references\u002Fsdk-msbuild-dotnet9to10.md` |\n| ASP.NET Core | `references\u002Faspnet-core-dotnet9to10.md` |\n| Entity Framework Core | `references\u002Fefcore-dotnet9to10.md` |\n| Cryptography APIs | `references\u002Fcryptography-dotnet9to10.md` |\n| Microsoft.Extensions.Hosting, BackgroundService, configuration | `references\u002Fextensions-hosting-dotnet9to10.md` |\n| System.Text.Json, XmlSerializer, HttpClient, MailAddress, Uri | `references\u002Fserialization-networking-dotnet9to10.md` |\n| Windows Forms or WPF | `references\u002Fwinforms-wpf-dotnet9to10.md` |\n| Docker containers, single-file apps, native interop | `references\u002Fcontainers-interop-dotnet9to10.md` |\n\n**Common source-incompatible changes to check for:**\n\n1. **`System.Linq.Async` conflicts** — Remove the `System.Linq.Async` package reference or upgrade to v7.0.0. If consumed transitively, add `\u003CExcludeAssets>compile\u003C\u002FExcludeAssets>`. Rename `SelectAwait` calls to `Select` where needed.\n\n2. **New obsoletion warnings (SYSLIB0058–SYSLIB0062)**:\n   - `SYSLIB0058`: Replace `SslStream.KeyExchangeAlgorithm`\u002F`CipherAlgorithm`\u002F`HashAlgorithm` with `NegotiatedCipherSuite` — if the old properties were used to reject weak TLS ciphers, preserve equivalent validation logic using the new API\n   - `SYSLIB0059`: Replace `SystemEvents.EventsThreadShutdown` with `AppDomain.ProcessExit`\n   - `SYSLIB0060`: Replace `Rfc2898DeriveBytes` constructors with `Rfc2898DeriveBytes.Pbkdf2`\n   - `SYSLIB0061`: Replace `Queryable.MaxBy`\u002F`MinBy` overloads taking `IComparer\u003CTSource>` with ones taking `IComparer\u003CTKey>`\n   - `SYSLIB0062`: Replace `XsltSettings.EnableScript` usage\n\n3. **C# 14 `field` keyword in property accessors** — The identifier `field` is now a contextual keyword inside property `get`\u002F`set`\u002F`init` accessors. Local variables named `field` cause CS9272 (error). Class members named `field` referenced without `this.` cause CS9258 (warning). Fix by renaming (e.g., `fieldValue`) or escaping with `@field`. See `references\u002Fcsharp-compiler-dotnet9to10.md`.\n\n4. **C# 14 `extension` contextual keyword** — Types, aliases, or type parameters named `extension` are disallowed. Rename or escape with `@extension`.\n\n5. **C# 14 overload resolution with span parameters** — Expression trees containing `.Contains()` on arrays may now bind to `MemoryExtensions.Contains` instead of `Enumerable.Contains`. `Enumerable.Reverse` on arrays may resolve to the in-place `Span` extension. Fix by casting to `IEnumerable\u003CT>`, using `.AsEnumerable()`, or explicit static invocations. See `references\u002Fcsharp-compiler-dotnet9to10.md` for full details.\n\n6. **ASP.NET Core obsoletions** (if applicable):\n   - `WebHostBuilder`, `IWebHost`, `WebHost` are obsolete — migrate to `Host.CreateDefaultBuilder` or `WebApplication.CreateBuilder`\n   - `IActionContextAccessor` \u002F `ActionContextAccessor` obsolete\n   - `WithOpenApi` extension method deprecated\n   - `IncludeOpenAPIAnalyzers` property deprecated\n   - `IPNetwork` and `ForwardedHeadersOptions.KnownNetworks` obsolete\n   - Razor runtime compilation is obsolete\n   - `Microsoft.Extensions.ApiDescription.Client` package deprecated\n   - **`Microsoft.OpenApi` v2.x breaking changes** — `Microsoft.AspNetCore.OpenApi 10.0` pulls in `Microsoft.OpenApi` v2.x which restructures namespaces and models. `OpenApiString`\u002F`OpenApiAny` types are removed (use `JsonNode`), `OpenApiSecurityScheme.Reference` replaced by `OpenApiSecuritySchemeReference`, collections on OpenAPI model objects may be null, and `OpenApiSchema.Nullable` is removed. See `references\u002Faspnet-core-dotnet9to10.md` for migration patterns.\n\n7. **SDK changes**:\n   - `dotnet new sln` now defaults to SLNX format — use `--format sln` if the old format is needed\n   - Double quotes in file-level directives are disallowed\n   - `dnx.ps1` removed from .NET SDK\n   - `project.json` no longer supported in `dotnet restore`\n\n8. **EF Core source changes** (if applicable) — See `references\u002Fefcore-dotnet9to10.md` for:\n   - `ExecuteUpdateAsync` now accepts a regular lambda (expression tree construction code must be rewritten)\n   - `IDiscriminatorPropertySetConvention` signature changed\n   - `IRelationalCommandDiagnosticsLogger` methods add `logCommandText` parameter\n\n9. **WinForms\u002FWPF source changes** (if applicable):\n   - Applications referencing both WPF and WinForms must disambiguate `MenuItem` and `ContextMenu` types\n   - Renamed parameter in `HtmlElement.InsertAdjacentElement`\n   - Empty `ColumnDefinitions` and `RowDefinitions` are disallowed in WPF\n\n10. **Cryptography source changes** (if applicable):\n   - `MLDsa` and `SlhDsa` members renamed from `SecretKey` to `PrivateKey` (e.g., `ExportMLDsaSecretKey` → `ExportMLDsaPrivateKey`, `SecretKeySizeInBytes` → `PrivateKeySizeInBytes`)\n   - `Rfc2898DeriveBytes` constructors are obsolete (SYSLIB0060) — replace with static `Rfc2898DeriveBytes.Pbkdf2(password, salt, iterations, hashAlgorithm, outputLength)`\n   - `CoseSigner.Key` can now be null — check for null before use\n   - `X509Certificate.GetKeyAlgorithmParameters()` and `PublicKey.EncodedParameters` can return null\n   - Environment variable renamed from `CLR_OPENSSL_VERSION_OVERRIDE` to `DOTNET_OPENSSL_VERSION_OVERRIDE`\n\nBuild again after each batch of fixes. Repeat until the build is clean.\n\n### Step 4: Address behavioral changes\n\nBehavioral changes do not cause build errors but may change runtime behavior. Review each applicable item and determine whether the previous behavior was relied upon.\n\n**High-impact behavioral changes (check first):**\n\n1. **SIGTERM signal handling removed** — The .NET runtime no longer registers default SIGTERM handlers. If you rely on `AppDomain.ProcessExit` or `AssemblyLoadContext.Unloading` being raised on SIGTERM:\n   - ASP.NET Core and Generic Host apps are unaffected (they register their own handlers)\n   - Console apps and containerized apps without Generic Host must register `PosixSignalRegistration.Create(PosixSignal.SIGTERM, _ => Environment.Exit(0))` explicitly\n\n2. **BackgroundService.ExecuteAsync runs entirely on a background thread** — The synchronous portion before the first `await` no longer blocks startup. If startup ordering matters, move that code to `StartAsync` or the constructor, or implement `IHostedLifecycleService`.\n\n3. **Configuration null values are now preserved** — JSON `null` values are no longer converted to empty strings. Properties initialized with non-default values will be overwritten with `null`. Review configuration binding code.\n\n4. **Microsoft.Data.Sqlite DateTimeOffset changes** (all High impact):\n   - `GetDateTimeOffset` without an offset now assumes UTC (previously assumed local)\n   - Writing `DateTimeOffset` into REAL columns now converts to UTC first\n   - `GetDateTime` with an offset now returns UTC with `DateTimeKind.Utc`\n   - Mitigation: `AppContext.SetSwitch(\"Microsoft.Data.Sqlite.Pre10TimeZoneHandling\", true)` as a temporary workaround\n\n5. **EF Core parameterized collections** — `.Contains()` on collections now uses multiple scalar parameters instead of JSON\u002FOPENJSON. May affect query performance for large collections. Mitigation: `UseParameterizedCollectionMode(ParameterTranslationMode.Parameter)` to revert.\n\n6. **EF Core JSON data type on Azure SQL** — Azure SQL and compatibility level ≥170 now use the `json` data type instead of `nvarchar(max)`. A migration will be generated to alter existing columns. Mitigation: set compatibility level to 160 or use `HasColumnType(\"nvarchar(max)\")` explicitly.\n\n7. **System.Text.Json property name conflict validation** — Polymorphic types with properties conflicting with metadata names (`$type`, `$id`, `$ref`) now throw `InvalidOperationException`. Add `[JsonIgnore]` to conflicting properties.\n\n**Other behavioral changes to review:**\n\n- `BufferedStream.WriteByte` no longer implicitly flushes — add explicit `Flush()` calls if needed\n- Default trace context propagator updated to W3C standard\n- `DriveInfo.DriveFormat` returns actual Linux filesystem type names\n- LDAP `DirectoryControl` parsing is more stringent\n- Default .NET container images switched from Debian to Ubuntu (Debian images no longer shipped)\n- Single-file apps no longer look for native libraries in executable directory by default\n- `DllImportSearchPath.AssemblyDirectory` only searches the assembly directory\n- `MailAddress` enforces validation for consecutive dots\n- Streaming HTTP responses enabled by default in browser HTTP clients\n- `Uri` length limits removed — add explicit length validation if `Uri` was used to reject oversized input from untrusted sources\n- Cookie login redirects disabled for known API endpoints (ASP.NET Core)\n- `XmlSerializer` no longer ignores `[Obsolete]` properties — audit obsolete properties for sensitive data and add `[XmlIgnore]` to prevent unintended data exposure\n- `dotnet restore` audits transitive packages\n- `dotnet watch` logs to stderr instead of stdout\n- `dotnet` CLI commands log non-command-relevant data to stderr\n- Various NuGet behavioral changes (see `references\u002Fsdk-msbuild-dotnet9to10.md`)\n- `StatusStrip` uses System RenderMode by default (WinForms)\n- `TreeView` checkbox image truncation fix (WinForms)\n- `DynamicResource` incorrect usage causes crash (WPF)\n\n### Step 5: Update infrastructure\n\n1. **Dockerfiles**: Update base images. Default tags now use Ubuntu instead of Debian. Debian images are no longer shipped for .NET 10.\n   ```dockerfile\n   # Before\n   FROM mcr.microsoft.com\u002Fdotnet\u002Fsdk:9.0 AS build\n   FROM mcr.microsoft.com\u002Fdotnet\u002Faspnet:9.0\n   # After\n   FROM mcr.microsoft.com\u002Fdotnet\u002Fsdk:10.0 AS build\n   FROM mcr.microsoft.com\u002Fdotnet\u002Faspnet:10.0\n   ```\n\n2. **CI\u002FCD pipelines**: Update SDK version references. If using `global.json`, update:\n   ```json\n   {\n     \"sdk\": {\n       \"version\": \"10.0.100\"\n     }\n   }\n   ```\n\n3. **Environment variables renamed**:\n   - `DOTNET_OPENSSL_VERSION_OVERRIDE` replaces the old name\n   - `DOTNET_ICU_VERSION_OVERRIDE` replaces the old name\n   - `NUGET_ENABLE_ENHANCED_HTTP_RETRY` has been removed\n\n4. **OpenSSL requirements**: OpenSSL 1.1.1 or later is now required on Unix. OpenSSL cryptographic primitives are no longer supported on macOS.\n\n5. **Solution file format**: If `dotnet new sln` is used in scripts, note it now generates SLNX format. Pass `--format sln` if the old format is needed.\n\n### Step 6: Verify\n\n1. Run a full clean build: `dotnet build --no-incremental`\n2. Run all tests: `dotnet test`\n3. If the application is containerized, build and test the container image\n4. Smoke-test the application, paying special attention to:\n   - Signal handling \u002F graceful shutdown behavior\n   - Background services startup ordering\n   - Configuration binding with null values\n   - Date\u002Ftime handling with Sqlite\n   - JSON serialization with polymorphic types\n   - EF Core queries using `.Contains()` on collections\n5. **Security review** — verify that the migration has not weakened security controls:\n   - TLS cipher validation logic is preserved after `SslStream` API migration (SYSLIB0058)\n   - Obsolete properties containing sensitive data are excluded from serialization (`[XmlIgnore]`, `[JsonIgnore]`)\n   - Input validation still rejects oversized URIs if `Uri` was used as a length gate\n   - Exception handlers emit security-relevant telemetry (auth failures, access violations) before returning `true`\n   - Connection strings set an explicit `Application Name` that does not leak version info\n   - `dotnet restore` vulnerability audit findings are addressed, not suppressed\n6. Review the diff and ensure no unintended behavioral changes were introduced\n\n## Reference Documents\n\nThe `references\u002F` folder contains detailed breaking change information organized by technology area. Load only the references relevant to the project being migrated:\n\n| Reference file | When to load |\n|----------------|-------------|\n| `references\u002Fcsharp-compiler-dotnet9to10.md` | Always (C# 14 compiler breaking changes — field keyword, extension keyword, span overloads) |\n| `references\u002Fcore-libraries-dotnet9to10.md` | Always (applies to all .NET 10 projects) |\n| `references\u002Fsdk-msbuild-dotnet9to10.md` | Always (SDK and build tooling changes) |\n| `references\u002Faspnet-core-dotnet9to10.md` | Project uses ASP.NET Core |\n| `references\u002Fefcore-dotnet9to10.md` | Project uses Entity Framework Core or Microsoft.Data.Sqlite |\n| `references\u002Fcryptography-dotnet9to10.md` | Project uses System.Security.Cryptography or X.509 certificates |\n| `references\u002Fextensions-hosting-dotnet9to10.md` | Project uses Generic Host, BackgroundService, or Microsoft.Extensions.Configuration |\n| `references\u002Fserialization-networking-dotnet9to10.md` | Project uses System.Text.Json, XmlSerializer, HttpClient, or networking APIs |\n| `references\u002Fwinforms-wpf-dotnet9to10.md` | Project uses Windows Forms or WPF |\n| `references\u002Fcontainers-interop-dotnet9to10.md` | Project uses Docker containers, single-file publishing, or native interop (P\u002FInvoke) |\n",{"data":32,"body":33},{"name":4,"description":6,"license":22},{"type":34,"children":35},"root",[36,45,60,67,132,138,197,203,346,352,384,391,615,621,824,830,835,1025,1033,1841,1969,1974,1980,1985,1993,2272,2280,2493,2499,2768,2774,2941,2947,2959,3141],{"type":37,"tag":38,"props":39,"children":41},"element","h1",{"id":40},"net-9-net-10-migration",[42],{"type":43,"value":44},"text",".NET 9 → .NET 10 Migration",{"type":37,"tag":46,"props":47,"children":48},"p",{},[49,51,58],{"type":43,"value":50},"Migrate a .NET 9 project or solution to .NET 10, systematically resolving all breaking changes. 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var(--shiki-dark-text-decoration);}",{"items":3148,"total":3257},[3149,3168,3183,3201,3215,3235,3245],{"slug":3150,"name":3150,"fn":3151,"description":3152,"org":3153,"tags":3154,"stars":19,"repoUrl":20,"updatedAt":3167},"analyzing-dotnet-performance","analyze .NET code for performance anti-patterns","Scans .NET code for ~50 performance anti-patterns across async, memory, strings, collections, LINQ, regex, serialization, and I\u002FO with tiered severity classification. Use when analyzing .NET code for optimization opportunities, reviewing hot paths, or auditing allocation-heavy patterns.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3155,3158,3161,3164],{"name":3156,"slug":3157,"type":15},".NET","net",{"name":3159,"slug":3160,"type":15},"Code Analysis","code-analysis",{"name":3162,"slug":3163,"type":15},"Debugging","debugging",{"name":3165,"slug":3166,"type":15},"Performance","performance","2026-07-12T08:23:25.400375",{"slug":3169,"name":3169,"fn":3170,"description":3171,"org":3172,"tags":3173,"stars":19,"repoUrl":20,"updatedAt":3182},"android-tombstone-symbolication","symbolicate .NET runtime frames in Android tombstones","Symbolicate the .NET runtime frames in an Android tombstone file. Extracts BuildIds and PC offsets from the native backtrace, downloads debug symbols from the Microsoft symbol server, and runs llvm-symbolizer to produce function names with source file and line numbers. USE FOR triaging a .NET MAUI or Mono Android app crash from a tombstone, resolving native backtrace frames in libmonosgen-2.0.so or libcoreclr.so to .NET runtime source code, or investigating SIGABRT, SIGSEGV, or other native signals originating from the .NET runtime on Android. DO NOT USE FOR pure Java\u002FKotlin crashes, managed .NET exceptions that are already captured in logcat, or iOS crash logs. INVOKES Symbolicate-Tombstone.ps1 script, llvm-symbolizer, Microsoft symbol server.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3174,3175,3178,3179],{"name":3156,"slug":3157,"type":15},{"name":3176,"slug":3177,"type":15},"Android","android",{"name":3162,"slug":3163,"type":15},{"name":3180,"slug":3181,"type":15},"Microsoft","microsoft","2026-07-12T08:23:21.595572",{"slug":3184,"name":3184,"fn":3185,"description":3186,"org":3187,"tags":3188,"stars":19,"repoUrl":20,"updatedAt":3200},"apple-crash-symbolication","symbolicate .NET runtime frames in crash logs","Symbolicate .NET runtime frames in Apple platform .ips crash logs (iOS, tvOS, Mac Catalyst, macOS). Extracts UUIDs and addresses from the native backtrace, locates dSYM debug symbols, and runs atos to produce function names with source file and line numbers. Automatically downloads .dwarf symbols from the Microsoft symbol server using Mach-O UUIDs. USE FOR triaging a .NET MAUI or Mono app crash from an .ips file on any Apple platform, resolving native backtrace frames in libcoreclr or libmonosgen-2.0 to .NET runtime source code, retrieving .ips crash logs from a connected iOS device or iPhone, or investigating EXC_CRASH, EXC_BAD_ACCESS, SIGABRT, or SIGSEGV originating from the .NET runtime. DO NOT USE FOR pure Swift\u002FObjective-C crashes with no .NET components, or Android tombstone files. INVOKES Symbolicate-Crash.ps1 script, atos, dwarfdump, idevicecrashreport.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3189,3190,3191,3194,3197],{"name":3156,"slug":3157,"type":15},{"name":3162,"slug":3163,"type":15},{"name":3192,"slug":3193,"type":15},"iOS","ios",{"name":3195,"slug":3196,"type":15},"macOS","macos",{"name":3198,"slug":3199,"type":15},"Observability","observability","2026-07-12T08:23:20.369986",{"slug":3202,"name":3202,"fn":3203,"description":3204,"org":3205,"tags":3206,"stars":19,"repoUrl":20,"updatedAt":3214},"assertion-quality","evaluate assertion quality in test suites","Analyzes the variety and depth of assertions across test suites in any language. Use when the user asks to evaluate assertion quality, find shallow tests, identify assertion-free tests (no assertions or only trivial ones like Assert.IsNotNull \u002F toBeTruthy()), flag self-referential or tautological assertions, measure assertion diversity, or audit whether tests verify different facets of behavior. Polyglot: .NET, Python, TS\u002FJS, Java, Go, Ruby, Rust, Swift, Kotlin, PowerShell, C++. DO NOT USE FOR: writing new tests (use code-testing-agent \u002F writing-mstest-tests), mutation reasoning about whether tests would catch a bug (use test-gap-analysis), or a general severity-ranked anti-pattern audit (use test-anti-patterns), fixing or rewriting assertions, or writing, fixing, or modernizing MSTest tests, assertions, or attributes (use writing-mstest-tests).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3207,3208,3211],{"name":3159,"slug":3160,"type":15},{"name":3209,"slug":3210,"type":15},"QA","qa",{"name":3212,"slug":3213,"type":15},"Testing","testing","2026-07-12T08:23:51.277743",{"slug":3216,"name":3216,"fn":3217,"description":3218,"org":3219,"tags":3220,"stars":19,"repoUrl":20,"updatedAt":3234},"author-component","create and review Blazor components","Create or review Blazor components (.razor files) with correct architecture. USE FOR: writing new Blazor components that do NOT involve JavaScript interop, implementing parameters and EventCallback, RenderFragment slots, component lifecycle (OnInitializedAsync, OnParametersSet), async patterns, IAsyncDisposable, CancellationToken, CSS isolation, code-behind. DO NOT USE FOR: creating new projects (use create-blazor-project), JavaScript interop or calling browser APIs from Blazor (use use-js-interop), forms and validation (use collect-user-input), prerendering issues (use support-prerendering), HTTP data fetching patterns (use fetch-and-send-data), coordinating state between unrelated components (use coordinate-components).\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3221,3222,3225,3228,3231],{"name":3156,"slug":3157,"type":15},{"name":3223,"slug":3224,"type":15},"Blazor","blazor",{"name":3226,"slug":3227,"type":15},"C#","csharp",{"name":3229,"slug":3230,"type":15},"UI Components","ui-components",{"name":3232,"slug":3233,"type":15},"Web Development","web-development","2026-07-15T06:03:29.216359",{"slug":3236,"name":3236,"fn":3237,"description":3238,"org":3239,"tags":3240,"stars":19,"repoUrl":20,"updatedAt":3244},"binlog-failure-analysis","analyze MSBuild binary logs","Analyze MSBuild binary logs to diagnose build failures. USE FOR: build errors that are unclear from console output, diagnosing cascading failures across multi-project builds, tracing MSBuild target execution order, and generally any MSBuild build issues. Requires an existing .binlog file. DO NOT USE FOR: generating binlogs (use binlog-generation), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3241,3242,3243],{"name":3159,"slug":3160,"type":15},{"name":3162,"slug":3163,"type":15},{"name":3180,"slug":3181,"type":15},"2026-07-12T08:21:34.637923",{"slug":3246,"name":3246,"fn":3247,"description":3248,"org":3249,"tags":3250,"stars":19,"repoUrl":20,"updatedAt":3256},"binlog-generation","generate MSBuild binary logs for diagnostics","Generate MSBuild binary logs (binlogs) for build diagnostics and analysis. USE FOR: adding \u002Fbl:{} to any dotnet build, test, pack, publish, or restore command to capture a full build execution trace, prerequisite for binlog-failure-analysis and build-perf-diagnostics skills, enabling post-build investigation of errors or performance. Requires MSBuild 17.8+ \u002F .NET 8 SDK+ for {} placeholder; PowerShell needs -bl:{{}}. DO NOT USE FOR: non-MSBuild build systems (npm, Maven, CMake), analyzing an existing binlog (use binlog-failure-analysis instead).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3251,3254,3255],{"name":3252,"slug":3253,"type":15},"Build","build",{"name":3162,"slug":3163,"type":15},{"name":17,"slug":18,"type":15},"2026-07-19T05:38:19.340791",96,{"items":3259,"total":3364},[3260,3272,3279,3286,3294,3300,3308,3314,3320,3330,3343,3354],{"slug":3261,"name":3261,"fn":3262,"description":3263,"org":3264,"tags":3265,"stars":3269,"repoUrl":3270,"updatedAt":3271},"multithreaded-task-migration","migrate MSBuild tasks to multithreaded mode","Guide for migrating MSBuild tasks to multithreaded mode support, including compatibility red-team review. Use this when converting tasks to thread-safe versions, implementing IMultiThreadableTask, adding TaskEnvironment support, or auditing migrations for behavioral compatibility.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3266,3267,3268],{"name":3156,"slug":3157,"type":15},{"name":17,"slug":18,"type":15},{"name":3165,"slug":3166,"type":15},5535,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fmsbuild","2026-07-22T05:37:33.965588",{"slug":3150,"name":3150,"fn":3151,"description":3152,"org":3273,"tags":3274,"stars":19,"repoUrl":20,"updatedAt":3167},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3275,3276,3277,3278],{"name":3156,"slug":3157,"type":15},{"name":3159,"slug":3160,"type":15},{"name":3162,"slug":3163,"type":15},{"name":3165,"slug":3166,"type":15},{"slug":3169,"name":3169,"fn":3170,"description":3171,"org":3280,"tags":3281,"stars":19,"repoUrl":20,"updatedAt":3182},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3282,3283,3284,3285],{"name":3156,"slug":3157,"type":15},{"name":3176,"slug":3177,"type":15},{"name":3162,"slug":3163,"type":15},{"name":3180,"slug":3181,"type":15},{"slug":3184,"name":3184,"fn":3185,"description":3186,"org":3287,"tags":3288,"stars":19,"repoUrl":20,"updatedAt":3200},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3289,3290,3291,3292,3293],{"name":3156,"slug":3157,"type":15},{"name":3162,"slug":3163,"type":15},{"name":3192,"slug":3193,"type":15},{"name":3195,"slug":3196,"type":15},{"name":3198,"slug":3199,"type":15},{"slug":3202,"name":3202,"fn":3203,"description":3204,"org":3295,"tags":3296,"stars":19,"repoUrl":20,"updatedAt":3214},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3297,3298,3299],{"name":3159,"slug":3160,"type":15},{"name":3209,"slug":3210,"type":15},{"name":3212,"slug":3213,"type":15},{"slug":3216,"name":3216,"fn":3217,"description":3218,"org":3301,"tags":3302,"stars":19,"repoUrl":20,"updatedAt":3234},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3303,3304,3305,3306,3307],{"name":3156,"slug":3157,"type":15},{"name":3223,"slug":3224,"type":15},{"name":3226,"slug":3227,"type":15},{"name":3229,"slug":3230,"type":15},{"name":3232,"slug":3233,"type":15},{"slug":3236,"name":3236,"fn":3237,"description":3238,"org":3309,"tags":3310,"stars":19,"repoUrl":20,"updatedAt":3244},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3311,3312,3313],{"name":3159,"slug":3160,"type":15},{"name":3162,"slug":3163,"type":15},{"name":3180,"slug":3181,"type":15},{"slug":3246,"name":3246,"fn":3247,"description":3248,"org":3315,"tags":3316,"stars":19,"repoUrl":20,"updatedAt":3256},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3317,3318,3319],{"name":3252,"slug":3253,"type":15},{"name":3162,"slug":3163,"type":15},{"name":17,"slug":18,"type":15},{"slug":3321,"name":3321,"fn":3322,"description":3323,"org":3324,"tags":3325,"stars":19,"repoUrl":20,"updatedAt":3329},"build-parallelism","optimize MSBuild build parallelism","Diagnose and fix under-parallelized MSBuild builds. USE WHEN a multi-project solution build is slower than expected, doesn't speed up when you add cores, pegs a single core while others idle, or you want to know why `-m` isn't helping. Note: `\u002Fmaxcpucount` default is 1 (sequential) — always pass `-m` for parallel builds. Covers finding the critical path (longest serial ProjectReference chain), graph build (`\u002Fgraph`), BuildInParallel, and solution filters (`.slnf`). DO NOT USE FOR: single-project builds, incremental issues (use incremental-build), compilation slowness inside one project (use build-perf-diagnostics), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3326,3327,3328],{"name":3156,"slug":3157,"type":15},{"name":17,"slug":18,"type":15},{"name":3165,"slug":3166,"type":15},"2026-07-19T05:38:18.364937",{"slug":3331,"name":3331,"fn":3332,"description":3333,"org":3334,"tags":3335,"stars":19,"repoUrl":20,"updatedAt":3342},"build-perf-baseline","establish and optimize build performance baselines","Establish build performance baselines and apply systematic optimization techniques. USE FOR: diagnosing slow builds, establishing before\u002Fafter measurements (cold, warm, no-op scenarios), applying optimization strategies like MSBuild Server, static graph builds, artifacts output, and dependency graph trimming. Start here before diving into build-perf-diagnostics, incremental-build, or build-parallelism. DO NOT USE FOR: non-MSBuild build systems, detailed bottleneck analysis (use build-perf-diagnostics after baselining).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3336,3337,3340,3341],{"name":17,"slug":18,"type":15},{"name":3338,"slug":3339,"type":15},"Monitoring","monitoring",{"name":3165,"slug":3166,"type":15},{"name":3212,"slug":3213,"type":15},"2026-07-12T08:21:35.865649",{"slug":3344,"name":3344,"fn":3345,"description":3346,"org":3347,"tags":3348,"stars":19,"repoUrl":20,"updatedAt":3353},"build-perf-diagnostics","diagnose MSBuild build performance bottlenecks","Diagnose MSBuild build performance bottlenecks using binary log analysis. USE FOR: identifying why builds are slow by analyzing binlog performance summaries, detecting ResolveAssemblyReference (RAR) taking >5s, Roslyn analyzers consuming >30% of Csc time, single targets dominating >50% of build time, node utilization below 80%, excessive Copy tasks, NuGet restore running every build. Covers timeline analysis, Target\u002FTask Performance Summary interpretation, and 7 common bottleneck categories. Use after build-perf-baseline has established measurements. DO NOT USE FOR: establishing initial baselines (use build-perf-baseline first), fixing incremental build issues (use incremental-build), parallelism tuning (use build-parallelism), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3349,3350,3351,3352],{"name":3156,"slug":3157,"type":15},{"name":3162,"slug":3163,"type":15},{"name":17,"slug":18,"type":15},{"name":3165,"slug":3166,"type":15},"2026-07-12T08:21:40.961722",{"slug":3355,"name":3355,"fn":3356,"description":3357,"org":3358,"tags":3359,"stars":19,"repoUrl":20,"updatedAt":3363},"check-bin-obj-clash","detect MSBuild output path conflicts","Detects MSBuild projects with conflicting OutputPath or IntermediateOutputPath. USE FOR: builds failing with 'Cannot create a file when that file already exists', 'The process cannot access the file because it is being used by another process', intermittent build failures that succeed on retry, or missing\u002Foverwritten outputs in multi-project or multi-targeting builds where bin\u002Fobj (or project.assets.json) collide. Common causes: shared OutputPath, missing AppendTargetFrameworkToOutputPath, extra global properties (e.g. PublishReadyToRun), or SetTargetFramework on a ProjectReference to a single-targeting project. DO NOT USE FOR: file access errors unrelated to MSBuild (OS-level locking), single-project single-TFM builds, non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[3360,3361,3362],{"name":3162,"slug":3163,"type":15},{"name":17,"slug":18,"type":15},{"name":3209,"slug":3210,"type":15},"2026-07-19T05:38:14.336279",144]