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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.\"\nlicense: MIT\n---\n\n# Analyzing MSBuild Failures with Binary Logs\n\nThis skill diagnoses MSBuild build failures from a `.binlog` file. The preferred\npath uses the **binlog MCP server** (`Microsoft.AITools.BinlogMcp`, exposed under the\n`binlog` MCP namespace) which is bundled with this plugin. If the MCP server is\nnot available, fall back to the **binlog replay** workflow at the bottom.\n\n## Primary workflow — binlog MCP\n\nThe MCP server exposes structured tools for inspecting a `.binlog` without\nparsing text logs. Call them directly instead of replaying the binlog to a text\nfile. Call `tools\u002Flist` for the MCP first if you are unsure which tools are available.\n\n**Important constraints:**\n- The `.binlog` file is a **binary format** — do NOT try to `cat`, `head`, `strings`, or read it directly. Use only the MCP tools to query it.\n- The **original source\u002Fproject files might or might NOT be available on disk**. Project files (.csproj, .props, .targets, App.config, etc.) - if you cannot locate them on disk, they can only be read from within the binlog via MCP tools (e.g., embedded\u002Fsource file retrieval).\n- **Synthesize findings as you go.** Do not spend all available time investigating — once you have enough evidence, present your conclusions. A partial answer with clear reasoning is better than timing out mid-investigation.\n\nUse the available MCP server tools to query the binary log for:\n- Build errors and warnings\n- MSBuild properties and their values\n- MSBuild items (PackageReference, ProjectReference, etc.)\n- Project evaluation data\n- Target execution details\n- File contents embedded in the binlog\n\n## Fallback workflow — text-log replay (when MCP is unavailable)\n\nUse this only when the MCP server cannot be started (for example, on an older\nSDK or in an offline environment without access to the `dotnet-tools` NuGet feed).\n\n### Replay the binlog to text logs\n\n```bash\ndotnet msbuild build.binlog -noconlog \\\n  -fl  -flp:v=diag;logfile=full.log;performancesummary \\\n  -fl1 -flp1:errorsonly;logfile=errors.log \\\n  -fl2 -flp2:warningsonly;logfile=warnings.log\n```\n\n> **PowerShell note:** Use `-flp:\"v=diag;logfile=full.log;performancesummary\"`\n> (quoted semicolons).\n\n### Search the text logs\n\n```bash\ncat errors.log\ngrep -n -B2 -A2 \"CS0246\" full.log\ngrep -i \"CoreCompile.*FAILED\\|Build FAILED\\|error MSB\" full.log\ngrep 'Target \"CoreCompile\"' full.log | grep -oP 'project \"[^\"]*\"'\n```\n\n## Generating a binlog (only if none exists)\n\n```bash\ndotnet build \u002Fbl:build.binlog\n```\n",{"data":35,"body":36},{"name":4,"description":6,"license":25},{"type":37,"children":38},"root",[39,48,94,101,121,129,197,202,235,241,254,261,419,441,447,594,600,624],{"type":40,"tag":41,"props":42,"children":44},"element","h1",{"id":43},"analyzing-msbuild-failures-with-binary-logs",[45],{"type":46,"value":47},"text","Analyzing MSBuild Failures with Binary Logs",{"type":40,"tag":49,"props":50,"children":51},"p",{},[52,54,61,63,69,71,77,79,85,87,92],{"type":46,"value":53},"This skill diagnoses MSBuild build failures from a ",{"type":40,"tag":55,"props":56,"children":58},"code",{"className":57},[],[59],{"type":46,"value":60},".binlog",{"type":46,"value":62}," file. 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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},[653,654,657,658],{"name":639,"slug":640,"type":15},{"name":655,"slug":656,"type":15},"Android","android",{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},"2026-07-12T08:23:21.595572",{"slug":661,"name":661,"fn":662,"description":663,"org":664,"tags":665,"stars":22,"repoUrl":23,"updatedAt":677},"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},[666,667,668,671,674],{"name":639,"slug":640,"type":15},{"name":20,"slug":21,"type":15},{"name":669,"slug":670,"type":15},"iOS","ios",{"name":672,"slug":673,"type":15},"macOS","macos",{"name":675,"slug":676,"type":15},"Observability","observability","2026-07-12T08:23:20.369986",{"slug":679,"name":679,"fn":680,"description":681,"org":682,"tags":683,"stars":22,"repoUrl":23,"updatedAt":691},"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},[684,685,688],{"name":17,"slug":18,"type":15},{"name":686,"slug":687,"type":15},"QA","qa",{"name":689,"slug":690,"type":15},"Testing","testing","2026-07-12T08:23:51.277743",{"slug":693,"name":693,"fn":694,"description":695,"org":696,"tags":697,"stars":22,"repoUrl":23,"updatedAt":711},"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},[698,699,702,705,708],{"name":639,"slug":640,"type":15},{"name":700,"slug":701,"type":15},"Blazor","blazor",{"name":703,"slug":704,"type":15},"C#","csharp",{"name":706,"slug":707,"type":15},"UI Components","ui-components",{"name":709,"slug":710,"type":15},"Web Development","web-development","2026-07-15T06:03:29.216359",{"slug":4,"name":4,"fn":5,"description":6,"org":713,"tags":714,"stars":22,"repoUrl":23,"updatedAt":24},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[715,716,717],{"name":17,"slug":18,"type":15},{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},{"slug":719,"name":719,"fn":720,"description":721,"org":722,"tags":723,"stars":22,"repoUrl":23,"updatedAt":731},"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},[724,727,728],{"name":725,"slug":726,"type":15},"Build","build",{"name":20,"slug":21,"type":15},{"name":729,"slug":730,"type":15},"Engineering","engineering","2026-07-19T05:38:19.340791",96,{"items":734,"total":839},[735,747,754,761,769,775,783,789,795,805,818,829],{"slug":736,"name":736,"fn":737,"description":738,"org":739,"tags":740,"stars":744,"repoUrl":745,"updatedAt":746},"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},[741,742,743],{"name":639,"slug":640,"type":15},{"name":729,"slug":730,"type":15},{"name":644,"slug":645,"type":15},5535,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fmsbuild","2026-07-22T05:37:33.965588",{"slug":633,"name":633,"fn":634,"description":635,"org":748,"tags":749,"stars":22,"repoUrl":23,"updatedAt":646},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[750,751,752,753],{"name":639,"slug":640,"type":15},{"name":17,"slug":18,"type":15},{"name":20,"slug":21,"type":15},{"name":644,"slug":645,"type":15},{"slug":648,"name":648,"fn":649,"description":650,"org":755,"tags":756,"stars":22,"repoUrl":23,"updatedAt":659},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[757,758,759,760],{"name":639,"slug":640,"type":15},{"name":655,"slug":656,"type":15},{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},{"slug":661,"name":661,"fn":662,"description":663,"org":762,"tags":763,"stars":22,"repoUrl":23,"updatedAt":677},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[764,765,766,767,768],{"name":639,"slug":640,"type":15},{"name":20,"slug":21,"type":15},{"name":669,"slug":670,"type":15},{"name":672,"slug":673,"type":15},{"name":675,"slug":676,"type":15},{"slug":679,"name":679,"fn":680,"description":681,"org":770,"tags":771,"stars":22,"repoUrl":23,"updatedAt":691},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[772,773,774],{"name":17,"slug":18,"type":15},{"name":686,"slug":687,"type":15},{"name":689,"slug":690,"type":15},{"slug":693,"name":693,"fn":694,"description":695,"org":776,"tags":777,"stars":22,"repoUrl":23,"updatedAt":711},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[778,779,780,781,782],{"name":639,"slug":640,"type":15},{"name":700,"slug":701,"type":15},{"name":703,"slug":704,"type":15},{"name":706,"slug":707,"type":15},{"name":709,"slug":710,"type":15},{"slug":4,"name":4,"fn":5,"description":6,"org":784,"tags":785,"stars":22,"repoUrl":23,"updatedAt":24},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[786,787,788],{"name":17,"slug":18,"type":15},{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},{"slug":719,"name":719,"fn":720,"description":721,"org":790,"tags":791,"stars":22,"repoUrl":23,"updatedAt":731},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[792,793,794],{"name":725,"slug":726,"type":15},{"name":20,"slug":21,"type":15},{"name":729,"slug":730,"type":15},{"slug":796,"name":796,"fn":797,"description":798,"org":799,"tags":800,"stars":22,"repoUrl":23,"updatedAt":804},"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},[801,802,803],{"name":639,"slug":640,"type":15},{"name":729,"slug":730,"type":15},{"name":644,"slug":645,"type":15},"2026-07-19T05:38:18.364937",{"slug":806,"name":806,"fn":807,"description":808,"org":809,"tags":810,"stars":22,"repoUrl":23,"updatedAt":817},"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},[811,812,815,816],{"name":729,"slug":730,"type":15},{"name":813,"slug":814,"type":15},"Monitoring","monitoring",{"name":644,"slug":645,"type":15},{"name":689,"slug":690,"type":15},"2026-07-12T08:21:35.865649",{"slug":819,"name":819,"fn":820,"description":821,"org":822,"tags":823,"stars":22,"repoUrl":23,"updatedAt":828},"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},[824,825,826,827],{"name":639,"slug":640,"type":15},{"name":20,"slug":21,"type":15},{"name":729,"slug":730,"type":15},{"name":644,"slug":645,"type":15},"2026-07-12T08:21:40.961722",{"slug":830,"name":830,"fn":831,"description":832,"org":833,"tags":834,"stars":22,"repoUrl":23,"updatedAt":838},"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},[835,836,837],{"name":20,"slug":21,"type":15},{"name":729,"slug":730,"type":15},{"name":686,"slug":687,"type":15},"2026-07-19T05:38:14.336279",144]