What is winforms-mcp CLAUDE.md?

Project instructions for a .NET MCP server that automates Windows Forms desktop applications without displaying them, using FlaUI to interact with Windows controls. They document how to build, test, and publish the server.

Building, testing, publishing, and running automated interactions with WinForms applications.

They give a coding agent the correct commands and project details needed to change or release the server safely.

How fnrhombus/winforms-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to fnrhombus/winforms-mcp. 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/fnrhombus/winforms-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/fnrhombus/winforms-mcp

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/instructions/fnrhombus/winforms-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/fnrhombus/winforms-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/fnrhombus/winforms-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/fnrhombus/winforms-mcp/claude-md/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/instructions/fnrhombus/winforms-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/fnrhombus/winforms-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 4,147 This file is loaded in full into every session.

When invoked 4,147 The same file — it is already loaded in full.

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	$0.04147	$0.04147
Opus 5.5	$0.01659	$0.01659
Sonnet 5.5	$0.00829	$0.00829
Haiku 4.5	$0.00415	$0.00415

Measured 2mo ago against content hash 113f0bf05d4f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

winforms-mcp CLAUDE.md 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 2mo 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.md · 368 lines

How it starts

The opening of the file, as written. The whole thing — 368 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Rhombus.WinFormsMcp is a Model Context Protocol (MCP) server that provides headless automation for WinForms applications using FlaUI with the UIA2 backend. The project structure follows the renamed pattern from fnWindowsMCP to Rhombus.WinFormsMcp.

Build Commands

# Build the solution
dotnet build Rhombus.WinFormsMcp.sln

# Build for release
dotnet build Rhombus.WinFormsMcp.sln --configuration Release

# Restore dependencies
dotnet restore Rhombus.WinFormsMcp.sln

# Publish the server
dotnet publish src/Rhombus.WinFormsMcp.Server/Rhombus.WinFormsMcp.Server.csproj -c Release -o publish

Test Commands

# Run all tests
dotnet test Rhombus.WinFormsMcp.sln

# Run tests with detailed output
dotnet test Rhombus.WinFormsMcp.sln --logger "console;verbosity=detailed"

# Run tests with code coverage
dotnet test Rhombus.WinFormsMcp.sln --collect:"XPlat Code Coverage"

# Run tests for release configuration
dotnet test Rhombus.WinFormsMcp.sln --configuration Release --no-build

Run Commands

# Run the MCP server
dotnet run --project src/Rhombus.WinFormsMcp.Server/Rhombus.WinFormsMcp.Server.csproj

# Run the test WinForms application
dotnet run --project src/Rhombus.WinFormsMcp.TestApp/Rhombus.WinFormsMcp.TestApp.csproj

Package Commands

# Create NuGet package (auto-generated on build)
dotnet build src/Rhombus.WinFormsMcp.Server/Rhombus.WinFormsMcp.Server.csproj -c Release

# Pack explicitly
dotnet pack src/Rhombus.WinFormsMcp.Server/Rhombus.WinFormsMcp.Server.csproj -c Release

Architecture

Core Components

Rhombus.WinFormsMcp.Server (src/Rhombus.WinFormsMcp.Server/)
- Program.cs: MCP server implementation with JSON-RPC 2.0 over stdio transport. Contains 33 tool implementations and SessionManager for element caching.
- Automation/AutomationHelper.cs: Core FlaUI wrapper with 40+ automation methods. Provides process management, element discovery, UI interaction, validation, window management, clipboard, and event capabilities.

Read the full file on GitHub · 368 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.

2mo ago First seen · 368 lines · 4,147 tokens per session scan A 113f0bf05d4f

Subscribe to this mod's changes

winforms-mcp CLAUDE.md is an instructions file published in the GitHub repository fnrhombus/winforms-mcp (13 stars, last pushed 7mo ago), licensed MIT. It adds 4,147 tokens to every session, about $0.0166 per session on Opus 5.5. 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 2026-08-31.

claude-code-plugin

winforms-mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
winforms-mcp CLAUDE.mdfnrhombus/winforms-mcp	Instructions file	13	7mo ago	MIT	A	4,147	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,685	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

winforms-mcp: Instructions file for Claude Code