What is make-avaloniaui-custom-control?

A command that converts an HTML page and optional CSS into an Avalonia UI custom control. Avalonia UI is a .NET framework for desktop interfaces, and AXAML is its markup format.

Use it to create a named custom control from a written description or HTML file, optionally using a separate CSS file, within an existing .NET solution.

It reduces the manual work of translating web-style markup and styling into an Avalonia custom-control project.

How christian289/dotnet-with-claudecode configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to christian289/dotnet-with-claudecode. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/christian289/dotnet-with-claudecode/main/.claude/commands/make-avaloniaui-custom-control.md

Clone the repo

git clone --depth 1 https://github.com/christian289/dotnet-with-claudecode

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/christian289/dotnet-with-claudecode/make-avaloniaui-custom-control/github.svg)](https://agentmods.dev/commands/christian289/dotnet-with-claudecode/make-avaloniaui-custom-control)

Your own site

<a href="https://agentmods.dev/commands/christian289/dotnet-with-claudecode/make-avaloniaui-custom-control"><img src="https://agentmods.dev/badge/commands/christian289/dotnet-with-claudecode/make-avaloniaui-custom-control/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/christian289/dotnet-with-claudecode/make-avaloniaui-custom-control"><img src="https://agentmods.dev/badge/commands/christian289/dotnet-with-claudecode/make-avaloniaui-custom-control.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 11 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 4,226 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00011	$0.04226
Opus 5	$0.00005	$0.02113
Sonnet 5	$0.00002	$0.00845
Haiku 4.5	$0.00001	$0.00423

Measured 10d ago against content hash 47e8f60618f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

make-avaloniaui-custom-control scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/make-avaloniaui-custom-control.md · 491 lines

How it starts

The opening of the file, as written. The whole thing — 491 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AvaloniaUI Custom Control Generation

Argument Information

Received arguments: $ARGUMENTS
Argument format: <ControlName> <description|HTML file> [CSS file]
- 1st argument (required): Custom Control file name (e.g., MyButton, CustomTextBox)
- 2nd argument (required): Control description text or HTML file path (.html extension)
- 3rd argument (optional): CSS file path (only used when 2nd argument is an HTML file)

Execution Procedure

Step 1: Argument Parsing and Validation

Parse arguments by splitting with spaces
If 1st or 2nd argument is missing, output error message and abort
Check if 2nd argument has .html extension to determine description mode or HTML mode
If in HTML mode and 3rd argument exists, verify CSS file existence

Step 2: Search for Solution and AvaloniaUI CustomControl Project Library

2.1 Search for Solution File

Search for .sln or .slnx file in current directory and parent directories.

# Find solution files
find . -maxdepth 2 -name "*.sln" -o -name "*.slnx" | head -1

2.2 Search for AvaloniaUI CustomControl Project Library

If solution file exists, search for AvaloniaUI Custom Control Library projects within the solution directory.

AvaloniaUI CustomControl Project Library identification criteria (all must be met):

.csproj file exists
Themes directory exists
Themes/Generic.axaml file exists
.csproj contains Avalonia package reference

Search commands:

# Find directories containing .csproj files
find . -name "*.csproj" -type f

# Verify above conditions for each project directory

Step 3: Branch Processing Based on Solution and Project Status

Case A: No Solution File Found (Create New Solution with Gallery)

When no .sln or .slnx file is found in the current directory, create a complete development environment including a Gallery application for testing the custom control.

Project naming convention:

Solution: {ControlName}.Avalonia.slnx
Gallery Project: {ControlName}.Avalonia.Gallery (Avalonia Application)
UI Library Project: {ControlName}.Avalonia.UI (Avalonia Class Library)

Read the full file on GitHub · 491 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 491 lines · 11 tokens per session scan A 47e8f60618f0

Subscribe to this mod's changes

make-avaloniaui-custom-control is a command published in the GitHub repository christian289/dotnet-with-claudecode (41 stars, last pushed 1mo ago), licensed MIT. It adds 11 tokens to every session and 4,226 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude Code Frontend dotnet wpf

dotnet-with-claudecode: Command for Claude Code