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The agent-framework-hosting packages are conversion helpers, not a runtime.

Claude Code 2.1.260 adds a likely-cause diagnosis to the Prompt cache (main) line in /usage and to the prompt_cache status line object.

Agent Framework ships an in-memory chat history provider and nothing else for .NET.

EF Core never passes null to a value converter by default.

EF Core 11 still has no lock API.

onChanged never fires because no edit happens, and on iOS the engine's deleteBackward returns without touching anything when the field is empty.

GitHub's September 1, 2026 changelog lets Copilot submit an approving review that satisfies a repository's required-approval rule.

An EF Core interceptor is a class EF calls before and after operations like executing a command or SaveChanges, and it can modify or suppress them, not just observe.

A render mode decides where a Razor component executes and whether it is interactive.

ref.watch subscribes and rebuilds, ref.read reads once and never rebuilds.

The cold start of a subagent is not what costs you money.

A skill's body loads on demand, but its name and description sit in a listing that is always in the prompt, capped at 1% of the context window.

Conversation history can live in your process, in your database, in the provider, or on the machine that ran the agent.

W^X (write xor execute) is the rule that no memory page is writable and executable at the same time.

A Key is the identity half of Widget.canUpdate, the one line of framework code that decides whether an Element and its State are reused or thrown away.

MSTest 4.4 moves MSTest.SourceGeneration out of experimental and aligns it with the MSTest version.

Google Play required target API 36 from 2026-08-31, with extensions running to 2026-11-01.

The full migration off package:flutter/material.dart and package:flutter/cupertino.dart onto material_ui 1.1.1 and cupertino_ui 1.0.2: what dart fix --code=migrate_design_widgets rewrites, why third-party widgets start throwing ancestor-lookup errors, what

A step-by-step migration off the deprecated dart:html, dart:js_util, and package:js onto package:web 1.1.1 and dart:js_interop: how to find every offending import with the dart2wasm compiler, what dart fix does and does not rename, the JSImmutableListWrap…

A step-by-step migration off Mono onto CoreCLR for .NET MAUI on Android: the API 24 floor, the Mono-only MSBuild properties that now break your build, why your APK grew, how to profile the startup regression with dotnet-dsrouter and dotnet-trace, and what…

Defensive system prompts are heuristic.

Until now the only way to hand every developer the same MCP servers was managed-mcp.json, a file at a system path that takes exclusive control of MCP.

ModelContextProtocol 2.0.0 flipped HTTP transport to stateless by default, which is the one change that can drop every client still speaking 2025-11-25.

BinaryFormatter's implementation was deleted in .NET 9 and still throws PlatformNotSupportedException on .NET 10 and .NET 11: how to choose a replacement serializer, read already-persisted NRBF blobs with NrbfDecoder, and what breaks in WinForms, WPF, and…

A step-by-step migration from VSTest to Microsoft.Testing.Platform 2.3.3: the OutputType Exe opt-in, the global.json runner switch, loggers becoming reporters, .runsettings becoming testconfig.json, and the exit codes that turn a green CI job red.

The experimental /rubber-duck command in VS Code 1.135 hands the agent's plan, code, and tests to a model from another family for review.

Eliding async/await in a repository passthrough saves about 6 ns and 72 bytes, and costs you a stack frame, try/catch semantics, and safe disposal.

A step-by-step migration from xunit 2.9.3 to xunit.v3 4.0.0: package swaps, the OutputType Exe change, IAsyncLifetime returning ValueTask, the Xunit.Abstractions removal, and the CI filter syntax that silently stops matching.

Framework-dependent on a chiseled aspnet image is the right default for an ASP.NET Core service on .NET 11, because the runtime layer is shared across services and a runtime CVE is fixed by a base image bump.

Instructions files are deterministic and always sent.

build_runner fails to compile because source_gen 3.1.0 or 4.0.0 calls an analyzer API removed in analyzer 8.4.0.

Firebase Auth restores the Android session from a private SharedPreferences file with no network call, so a release-only sign-out is never broken persistence.

GitHub's August 27 and August 28, 2026 changelogs remove the 20,000 line review cap, start reviewing bot-authored PRs, and flip the default review effort from Lite to Balanced on September 28.

Mapperly is the default for new .NET code: it matches hand-written speed, survives Native AOT, and catches unmapped members at build time.

Agent Plugins 1.0.0 standardizes exactly two component types: skills and MCP servers.

Protocol revision 2026-07-28 deleted Mcp-Session-Id, the initialize handshake, resources/subscribe, ping, logging/setLevel and SSE resumability.

iOS builds set DynamicCodeSupport=false, so EF Core refuses to build the model even though you never enabled NativeAOT.

EF Core's Migrate() always checks whether the database exists and creates it if not, from a hardcoded master connection.

The check-then-insert in your handler is not atomic.

Claude Code 2.1.251 adds PreModelSwitch and PostModelSwitch hook events.

A thread shares memory with every other thread in the process.

A server that vanished from /mcp with no error is almost always an allowlist.

BuildKit cannot read the manifest for your base image.

The APK has no native library for the device's CPU.

CA1070 fires on virtual field-like events.

A symlink swapped after the check, deny rules that stopped applying through a symlinked search path, a marketplace command pointing outside its plugin, and a workflow script read before approval.

Move every package version out of your csproj files into one Directory.Packages.props.

MCP9005 is advisory, but MCP9004 crashes at startup and stateless mode makes SampleAsync throw.

WithTerminal() gives a resource an interactive PTY session you can type into from the dashboard or attach to from your own shell.

Blazor has no syntax for a variable tag name, and DynamicComponent only renders component types.