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2026-07-30 errors blazor dotnet

Fix: JavaScript interop calls cannot be issued at this time (Blazor prerendering)

Prerendering runs your component on the server with no browser attached, so IJSRuntime throws. Move the call into OnAfterRenderAsync, gate it on RendererInfo.IsInteractive, or disable prerendering.

2026-07-30 errors mcp claude-code

Fix: .mcp.json servers never start because the workspace is marked untrusted

Project MCP servers stuck at Pending approval are not misconfigured. Run claude interactively in the folder, accept the workspace trust dialog, then approve the servers.

2026-07-30 errors ef-core ef-core-11

Fix: Your startup project doesn't reference Microsoft.EntityFrameworkCore.Design

Add Microsoft.EntityFrameworkCore.Design to the startup project that dotnet ef builds, not the project holding your DbContext, and pass -s in layered solutions.

2026-07-30 visual-studio ai-agents dotnet

Visual Studio 18.9 Lets You Set Thinking Effort Per Model

Visual Studio 18.9 Insiders 2 adds a per-model thinking effort control with Low through Max levels, exposing the same reasoning-effort dial the underlying model APIs take.

2026-07-29 errors dotnet docker

Fix: Couldn't find a valid ICU package installed on the system in a .NET container

Your base image has no ICU. Either install icu-libs and icu-data-full, switch to an -extra image variant, or set InvariantGlobalization=true and accept ordinal-only string behavior.

2026-07-29 errors csharp dotnet

Fix: Reflection-based serialization has been disabled for this application

This InvalidOperationException means PublishTrimmed or PublishAot flipped JsonSerializerIsReflectionEnabledByDefault to false. Fix it with a source-generated JsonSerializerContext.

2026-07-29 errors ef-core ef-core-11

Fix: "The model for context 'X' has pending changes" in EF Core 11

EF Core throws PendingModelChangesWarning when your model no longer matches the last migration snapshot. Add the migration, or fix the false positive behind it.

2026-07-29 errors mcp claude-code

Fix: a Windows path in your agent config silently turns into a tab, a newline, or a Chinese character

Folder names starting with t, b, n, r or u make a Windows path parse cleanly as JSON and still resolve wrong. Use forward slashes or double every backslash.

2026-07-29 mcp dotnet csharp

MCP C# SDK 2.0 Ships: Stateless by Default and MCP9005 on Your Old Code

ModelContextProtocol 2.0.0 landed on 2026-07-28 with the stateless HTTP transport on by default, Multi Round-Trip Requests replacing server-initiated elicitation, and an analyzer warning on ElicitAsync and SampleAsync.

2026-07-28 mcp ai-agents http

GitHub's MCP Server Went Stateless and Deleted Its Redis Session Store

On 2026-07-23 GitHub shipped the MCP 2026-07-28 revision ahead of the spec date. The notable part is the subtraction: no initialize handshake, no Mcp-Session-Id, no Redis.