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A server that vanished from /mcp with no error is almost always an allowlist. Run claude mcp add on the same server: the add path prints the reason the load path swallows.

A thread shares memory with every other thread in the process. A Dart isolate does not: it owns its heap, runs one event loop, and talks to other isolates only by messages. Here is what that means at the VM level, where isolate groups blur the line, and how it plays out in Flutter, FFI, and on the web.

WithTerminal() gives a resource an interactive PTY session you can type into from the dashboard or attach to from your own shell. It is experimental, it detaches the debugger, and the Shell option you may have written against is gone.

MCP9005 is advisory, but MCP9004 crashes at startup and stateless mode makes SampleAsync throw. Here is what each diagnostic means and how to fix it properly.

Move every package version out of your csproj files into one Directory.Packages.props. Covers a generator script that reconciles conflicting versions with real semver ordering, the before/after dependency-graph diff that proves what moved, NU1008/NU1010/NU1013/NU1507, transitive pinning, GlobalPackageReference, VersionOverride, and why a nested Directory.Packages.props silently shadows the root one.

Blazor has no syntax for a variable tag name, and DynamicComponent only renders component types. Override BuildRenderTree and call builder.OpenElement(0, $"h{level}"). Covers attribute splatting, why the tag name must be clamped before it reaches the DOM, why changing the level rips the element out of the DOM even with @key, and an auto-levelling variant built on a cascading value.

Inside testWidgets the ambient clock from package:clock is already fake, but it starts at whatever wall time the test began. Pin it for a whole suite by overriding runTest on a custom AutomatedTestWidgetsFlutterBinding installed from flutter_test_config.dart. Verified on Flutter 3.44.2, clock 1.1.2, fake_async 1.3.3.

MAUI 10.0.100 ships MauiBlazorWebViewBuilderExtensions.UsePlatformHandler, a supported seam for replacing BlazorWebViewHandler without reimplementing everything AddMauiBlazorWebView() registers. Two overloads, one ordering trap.

A headersHelper field on url marketplaces and catalog entries runs a local command that prints HTTP headers, so an internal plugin catalog behind S3 or an artifact repo can authenticate with a short-lived token. Here is the schema, the consent prompt, and the header names Claude Code drops.

MCP error -32022 means your client opened at 2025-11-25 but the server only serves 2026-07-28. Make one side dual-era instead of pinning a version.