What is refactor-mcp CLAUDE.md?

A repository guide for RefactorMCP, a Model Context Protocol server that provides C# code-refactoring tools using Microsoft's Roslyn code-analysis platform.

It helps with building the .NET project, running all tests or filtered tests, and understanding its console app, refactoring tools, syntax components, and test suite.

It explains the project's architecture, technologies, and commands so developers can change and test the right parts.

refactor-mcp CLAUDE.md — Instructions file for Claude Code by dave-hillier: A repository guide for RefactorMCP, a Model Context Protocol…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add instructions/dave-hillier/refactor-mcp/claude-md

Clone the repo

git clone --depth 1 https://github.com/dave-hillier/refactor-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/dave-hillier/refactor-mcp/claude-md.svg)](https://agentmods.dev/instructions/dave-hillier/refactor-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/dave-hillier/refactor-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/dave-hillier/refactor-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 801 This file is loaded in full into every session.

When invoked 801 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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	$0.00801	$0.00801
Opus 5	$0.00400	$0.00400
Sonnet 5	$0.00160	$0.00160
Haiku 4.5	$0.00080	$0.00080

Measured 6d ago against content hash afa0077e6cdb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

refactor-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 6d 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 · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 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

RefactorMCP is a Model Context Protocol server that exposes Roslyn-based refactoring tools for C#. It provides extensive code transformation capabilities through both CLI and MCP server modes.

Architecture

Core Components

RefactorMCP.ConsoleApp: Main application hosting refactoring tools and MCP server
- Tools/: Individual refactoring tool implementations (40+ tools)
- SyntaxRewriters/: Roslyn syntax tree rewriting components
- SyntaxWalkers/: Code analysis and traversal utilities
- Move/: Specialized method moving logic
RefactorMCP.Tests: Comprehensive xUnit test suite
- Each tool has corresponding test coverage
- Tests organized by feature area

Key Technologies

.NET 9.0
Roslyn (Microsoft.CodeAnalysis) for C# code analysis and transformation
xUnit for testing
Model Context Protocol for server functionality

Development Commands

Build

dotnet build

Run Tests

# Run all tests
dotnet test

# Run tests with filter
dotnet test --filter "FullyQualifiedName~MoveInstanceMethod"

# Run a specific test
dotnet test --filter "FullyQualifiedName=RefactorMCP.Tests.Tools.MoveInstanceMethodTests.Move_MethodWithNamedArguments_Success"

Run Application

# Run MCP server
dotnet run --project RefactorMCP.ConsoleApp

# Run with JSON mode
dotnet run --project RefactorMCP.ConsoleApp -- --json <tool-name> '<json-params>'

# Example: Load solution
dotnet run --project RefactorMCP.ConsoleApp -- --json load-solution '{"solutionPath":"./RefactorMCP.sln"}'

Format Code

dotnet format

Working with Refactoring Tools

Tool Naming Convention

Tools use kebab-case names (e.g., extract-method, move-instance-method)
Each tool has a corresponding class in RefactorMCP.ConsoleApp/Tools/

Adding New Tools

Create tool class in RefactorMCP.ConsoleApp/Tools/
Implement the refactoring logic using Roslyn APIs
Add corresponding tests in RefactorMCP.Tests/Tools/ or RefactorMCP.Tests/ToolsNew/
Register the tool in the appropriate location for MCP discovery

Read the full file on GitHub · 112 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.

6d ago First seen · 112 lines · 801 tokens per session scan A afa0077e6cdb

Subscribe to this mod's changes

refactor-mcp CLAUDE.md is an instructions file published in the GitHub repository dave-hillier/refactor-mcp (93 stars, last pushed 2mo ago), licensed MPL-2.0. It adds 801 tokens to every session, about $0.0040 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.

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

refactor-mcp CLAUDE.md