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Dot shorthands went stable in Dart 3.12.2. Write .center or .new and let the compiler infer the type from context. Here is how they work across enums, static members, and constructors.

Move the color inside the decoration: use decoration: BoxDecoration(color: ...) instead of passing both color and decoration to the same Container.

This error means an Expanded or Flexible is not a direct child of a Row, Column, or Flex. Move it directly under the flex widget, or drop Expanded if the parent is not a flex.

The slivers list of a CustomScrollView only accepts slivers. Wrap box widgets in SliverToBoxAdapter, or swap ListView/Padding/Column for SliverList and SliverPadding.

Claude Code v2.1.200 (July 3, 2026) renames the 'default' permission mode to 'Manual' across the CLI, VS Code, and JetBrains, and stops AskUserQuestion dialogs from auto-continuing. The config value stays 'default', with 'manual' accepted as an alias.

Use CodeAct (the agent writes executable code as its action) when your tasks chain many tools, loop, or move large data, and you can afford a sandbox. Use the JSON tool-calling loop for a handful of discrete, high-stakes actions where a code interpreter is overkill or unsafe. CodeAct wins on token cost and multi-step success rate; tool calling wins on safety and simplicity.

EF Core 11 throws this when a Where or OrderBy calls a method it cannot turn into SQL. Rewrite the predicate into translatable operators, or pull the data client-side with AsEnumerable first.

EF Core throws this when your raw SQL does not return every column the entity maps to, or the column names do not match. Return all mapped columns with matching names, or query a scalar/keyless type instead.

In a Notifier, resolve dependencies before the await, then guard the state write with if (!ref.mounted) return. This is the Riverpod 3.0 replacement for the old onDispose mixin, and it stops UnmountedRefException when a provider is disposed mid-await. Tested on flutter_riverpod 3.x, Flutter 3.44, Dart 3.x.

MCP connects one agent to its tools, A2A connects independent agents to each other. They are not competitors. Add MCP first, reach for A2A only when you have multiple separately deployed agents. Here is the wire-level difference and the code.