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Implement support for out-of-proc TaskHost item storage in the VS project system

Area: Visual StudioIssues related to interactions with Visual Studio or project systems.Issues related to interactions with Visual Studio or project systems.

Status: Open.

Task

#12999 In dotnet/msbuild;

· baronfel opened on Jan 9, 2026

Logger BuildEventContexts drop 'parent' context associations in certain use cases

Status: Open.

Bug

#12998 In dotnet/msbuild;

· baronfel opened on Jan 9, 2026

Make it easier to instrument/observe MSBuild invocations

Status: Open.

Epic

#12996 In dotnet/msbuild;

· baronfel opened on Jan 9, 2026

Create and ship AppHosts for MSBuild for the .NET distribution of MSBuild

Status: Open.

Feature

#12995 In dotnet/msbuild;

· baronfel opened on Jan 9, 2026

Adopt Visual Studio Shared Assembly Cache

Area: Visual StudioIssues related to interactions with Visual Studio or project systems.Issues related to interactions with Visual Studio or project systems.

Status: Open.

Epic

#12992 In dotnet/msbuild;

· rainersigwald opened on Jan 8, 2026

Should File IO tasks report in logs absolute paths of items they operate on?

Area: TasksIssues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.Issues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.

Status: Open.

Feature

#12990 In dotnet/msbuild;

· JanProvaznik opened on Jan 8, 2026

Collect telemetry to see the features usage

Area: TelemetryCandidates benefiting from telemtry dataCandidates benefiting from telemtry data

Status: Open.

#12988 In dotnet/msbuild;

· YuliiaKovalova opened on Jan 8, 2026

MSBUILDDONOTCATCHTASKEXCEPTIONS still catches the exception

Status: Open.

Bug

#12985 In dotnet/msbuild;

· ericstj opened on Jan 7, 2026

ProjectStartedEvents for already-run projects have bad IDs

Area: Logging

Priority:1Work that is critical for the release, but we could probably ship withoutWork that is critical for the release, but we could probably ship without

triaged

Status: Open.

Bug

#12953 In dotnet/msbuild;

· rainersigwald opened on Dec 17, 2025

Documentation: clarify ResolveAssemblyReference locations for .NET SDK

Area: DocumentationIssues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)Issues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)

Area: Task: Resolve Assembly References (RAR)

Priority:3Work that is nice to haveWork that is nice to have

triaged

Status: Open.

#12949 In dotnet/msbuild;

· hickford opened on Dec 16, 2025

blazor big project: build perf downgrade

Area: Performance

Priority:1Work that is critical for the release, but we could probably ship withoutWork that is critical for the release, but we could probably ship without

triaged

Status: Open.

#12954 In dotnet/msbuild;

· AdmiralSnyder opened on Dec 15, 2025

error MSB4166: Child node "3" exited prematurely

Area: IPCIssues concerning how MSBuild communicates between processes, including serialization.Issues concerning how MSBuild communicates between processes, including serialization.

needs-investigation

needs-more-infoIssues that need more info to continue investigation.Issues that need more info to continue investigation.

triaged

Status: Open.

Bug

#12944 In dotnet/msbuild;

· Liklainy opened on Dec 15, 2025