Agent Skill
Winforms Expert skill
winforms-expertdotnet/skillsplugins/dotnet-winforms/skills/winforms-expert/SKILL.md
Create, modify, debug, or review Windows Forms applications only when the request contains a concrete Windows Forms marker. USE FOR: WinForms, Windows Forms, System.Windows.Forms, WinForms Form or UserControl designer files (*.Designer.cs or *.Designer.vb), Visual Studio WinForms Designer, TableLayoutPanel, BindingSource, DataGridView, Control.InvokeAsync, component-tray ownership, or custom control serialization. DO NOT USE FOR: WPF or WPF XAML, including Window.InputBindings, KeyBinding, commands, or DataContext; .NET MAUI; Avalonia; or any request where none of the listed Windows Forms markers is present.
always on
137 tokname + description
once used
4,512 tokSKILL.md body
bundled files
0
repo stars
5.7kGitHub
Install the Winforms Expert skill
Skills CLI (Claude Code, Codex, Cursor and others)
npx skills add https://github.com/dotnet/skills --skill winforms-expert
Claude Code, by hand (all projects)
git clone --depth 1 https://github.com/dotnet/skills.git /tmp/skills mkdir -p ~/.claude/skills cp -R /tmp/skills/plugins/dotnet-winforms/skills/winforms-expert ~/.claude/skills/winforms-expert
For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.
What it costs your context
Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.
| When | What loads | Cost |
|---|---|---|
| Every session | Name and description | 137 tok |
| When the agent uses it | The SKILL.md instructions | 4,512 tok |
| Only if opened | No bundled files | — |
Until it is used, winforms-expert costs about 9.9× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 114 skills from dotnet/skills would load 15,432 tokens of descriptions. Skills vs MCP study
Checks
Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.
Checked 2026-10-22 · method
What's inside
The headings of its SKILL.md. Read the full file on GitHub.
- WinForms Expert
- Purpose
- Execution Contract
- Boundaries
- Inputs
- Non-Negotiable Designer Contract
- Rules That Change the Answer
- Workflow
- 1. Establish the project constraints
- 2. Plan the serialization boundary
- 3. Implement the UI structure
- 4. Add behavior outside generated code
- 5. Implement binding and serialization deliberately
- 6. Check usability and accessibility
- 7. Validate in increasing-cost order
- Observable Completion Criteria
- Common Pitfalls
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